Comparison of some properties of three kinds of resins
Epoxy key is less operation, thermal deformation temperature is relatively low, the corrosion of general and oxidation resistance is poor, the advantage of mechanical strength, impact toughness, electrical characteristics; vinyl resin is capable of operation, good corrosion resistance in comparison to highlight, also has good heat resistance, unsaturated performance advantages with vinyl resin almost, but basically than ethylene basis a grade, vinyl resin, unsaturated resin disadvantage is the mechanical strength, impact toughness, electrical performance than epoxy, if for a curing system, mechanical properties, impact toughness and electrical performance is to improve.Lees verder...
The emulsion polymerization technology
Study on emulsion polymerization technology Meng was born in the early 20th century, 30 years of the 20th century to achieve mass production of industrial, 40 years of the 20th century it started working in emulsion polymerization and achieved remarkable achievement, yet to the research is still in the continuous deepening.
Although so, emulsion polymerization theory still lag far behind in practice, is not yet mature, far from being able to meet to guide the actual production, many theoretical problems are still under debate. In order to meet the people of three synthetic materials growing demand, continue to develop emulsion polymerization technology, systematic and in-depth research theory of emulsion polymerization, determining a proper mechanism of emulsion polymerization, establish reasonable and can withstand repeated practice test emulsion polymerization kinetic model, to guide the emulsion polymerization of scientific research, production control and emulsion polymerization reactor optimal design and amplification, is an important task laid in front of the workers in this field.Lees verder...
Acrylate-Vinyl Chloride Copolymer Emulsion
Many commercial brands, according to its molecular structure contains different crosslinking monomer, processing of vulcanization system is not the same, which can be the acrylate rubber division for chlorine containing polyamine crosslinking, chlorine free polyamine crosslinking type, self crosslinking, carboxylic acid ammonium salt crosslinking, soap crosslinking type. In addition, there are special acrylate rubber, such as those containing fluorine type and thermal plastic acrylic rubber.
With acrylate rubber based, oil resistance, heat resistance better; and with butyl acrylate rubber based, due to the number of carbon atoms in the alkyl increased, shielding effect of ester base based on the increased. Therefore, the water resistance improved, at the same time due to the shielding effect, weakening the force between the rubber molecules, increased internal plastic, thereby reducing the brittle temperature, cold is better. If by the two monomers and can get somewhere in between the performance of the rubber.Lees verder...
Vinyl resin derived varieties
At present, vinyl resin has better corrosion resistance and improved process characteristics, which are widely used in corrosion resistant, corrosion resistant, corrosion resistant, etc., but in some non corrosion resistant composite materials, it is a new type of material, which is used to find a new type of high performance unsaturated resin, which is based on new research and development. Polyester resin, the English name is vinyl, which is referred to as "VPR", which is characterized by a combination of vinyl ester resin and general unsaturated resin, which makes the user have more choices.
VPR vinyl polyester resin is a kind of unsaturated polyester resin, which has good corrosion resistance, mechanical properties and dynamic load performance. In addition, VPR vinyl polyester resin has good weather resistance, and VPR VPR is suitable for all kinds of FRP forming technology, which is suitable for all kinds of composite materials. In addition, it is suitable for all kinds of composite materials. .Due to the unique properties of VPR vinyl polyester resin and reasonable cost, make the new material has a broad prospect of application: (1)glass steel concrete reinforcement; (2)Structural Materials II ship products; (3) Large FRP products produced in the structure layer material, especially whole field can replace the normal rules of vinyl resin structure layer; (4)the fatigue resistance of pultruded FRP profiles, such as motion of FRP bar. Lees verder...
The corrosion resistance of vinyl resin
The excellent corrosion- resistance of vinyl ester resin, the anticorrosive principle and its some applications at home and abroad were introduced in this paper.
Vinyl resin is made from the reaction of epoxy resin and acrylic acid and its derivatives. Its process performance is similar to unsaturated polyester resin, and similar to epoxy resin in chemical structure. Due to the resistance of corrosion, heat resistance, resistance to fatigue excellent performance, vinyl eater resin has been widely used in anti-corrosion tank, piping, tower, trough, the device, lining, ground, chimney, flue gas desulphurization, gas filtration, and the application domain is becoming more and more widely.Lees verder...
Introduction of vinyl ester resin
The vinyl ester resin is a kind of modified epoxy resin, which is reacted with the epoxy resin and acrylic acid. It is often called the vinyl ester resin (VE). Vinyl ester resin adhering to the excellent properties of epoxy resin, curing and molding of the more outstanding, can be dissolved in styrene and acrylic monomers, due to the advantages of both epoxy and unsaturated, its application field is expanding.
Novolac epoxy vinyl ester resin
The phenolic epoxy resin was introduced into the framework of vinyl ester resin, and the synthesis of vinyl ester resin was generally called Novolac vinyl ester resin. Resin with high thermal stability. After curing, the crosslinking density is large. The thermal deformation temperature of 120-135 DEG C, can extend the service life and has excellent corrosion resistance, especially of chlorine in solution or an organic solvent resistant corrosion of good.
High crosslinking density phenolic epoxy vinyl ester resin
In order to meet the needs of high temperature strength, many manufacturers have modified phenolic epoxy vinyl ester resin. The crosslinking density and heat resistance of the resin are improved, and the corrosion resistance and oxidation resistance of the resin are excellent. This type of domestic and foreign manufacturers less, while several foreign products are currently in the domestic market are not supplied, so it is not for the performance of these resins by GB standards for a comparison.
Flexible vinyl ester resin
In order to adapt to the needs of all kinds of anti corrosion engineering construction, the flexible vinyl ester resin is developed, which has a high adhesion to steel and concrete surface. Compared with the traditional epoxy vinyl ester resin, its elongation is higher, the adhesive strength is greatly improved, and the strength of anti impact strength is increased by 20%, and has a unique wear resistance.
Method for Producing Glyoxylic Acid
Glyoxylic acid, in two functional groups, 2 hydroxy acetic acid, and aldehyde and carboxylic groups in the molecule, with properties of the aldehyde and carboxylic acid an eternity, have the reactivity of all kinds. It has the structure of the aldehyde and an eternal, chemical nature very lively, as a kind of important organic intermediates, in medicine, pesticides, spices areas continue to expand. It is widely used in organic synthesis intermediates, spices, medicine, pesticide, food, and varnish for raw materials, dyes, plastics additives can also be used for oral penicillin, vanillin, ethyl vanillin, mandelic acid, allantoin and other products.
Glyoxal oxidation of a CID nitrate method: this method mild reaction conditions, the process is simple, mature, less investment of equipment is used by most manufacturers at home and abroad, but the waste acid method separation is difficult, the purity of product is low, quality is poor. A permanent, corrosion of equipment, prone to a high concentration of collision, the unreacted complete nitrate glyoxylate slow oxidation decomposition of nitric oxide gas, pollute the environment, not conversion of glyoxal to glyoxylic acid condensation reaction, limits the scope of its application. Research work, the activity method is the use of oxygen instead of glyoxalic acid, nitric acid catalytic glyoxal preparation commonly used catalysts are precious metals, oxides, a constant or a solid.Lees verder...
Something about vinyl ester resins
Vinyl Ester Resins is an internationally recognized high corrosion resistant resin. Standard bisphenol A epoxy vinyl ester resin is prepared by the reaction of methyl acrylic acid with bisphenol A epoxy resin, has been dissolved in styrene solution, the type of resin has the following characteristics:
1. In the molecular chain ends of the double bond is extremely active, so that vinyl resin can quickly cured, quickly get the use of strength, get a highly resistant to corrosive polymer;
2. Using the synthesis of methyl methacrylate, the ester bond edge of the methyl can be played a protective role, improve the water resistance;
3. Resin containing small amount of ester bond, per mole of Binet chemical polyester (bisphenol a fumaric acid UPR) less 35-50%, the alkali resistance improve;
4. More secondary hydroxyl can improve the wettability and adhesion of glass fiber, improve the mechanical strength of laminated products;
5. Because only in the molecular ends of the crosslinking.Lees verder...
The Packing of Sodium Formate
Sodium formate is non-toxic to human body. Non-corrosive, non-flammable, normally the storage security, with moisture absorption, easy deliquescence, storage and transportation should be paid attention to during the process of moisture, does not change the product in case of moisture absorption caking property, can be normal use after grinding.
It has stimulation. These products often contain 2 molecular crystal of water. It is poisonous. In the room temperature, it is white or light yellow crystalline solid, slightly deliquescence. Sodium formate has the water absorbability. Decomposed into sodium oxalate and hydrogen at high temperature, and then generate sodium carbonate. Sodium formate can decompose into hydrogen and sodium oxalate at strong temperature. Used in leather industry, the camouflage of chrome tanning acid, catalyst and the stability of synthetic agent, reducing agent of printing and dyeing industry, insurance powder, used in the production of oxalic acid and formic acid.
Sodium formate with lined with plastic woven bag packaging, each bag of 25 +/- 0.2 Kg net content, sodium formate should be stored in a dry, clean and ventilated warehouse and avoid damage to be affected with damp be affected with damp, shall not be open to pile up. Away from heat, fire, prevent sun point-blank, and oxidant, acid, alkali.Lees verder...
The types and application of water soluble PVA fiber
According to the temperature of solubility in water, PVA fiber can be divided into three types: Dissolved in low temperature (0-40¡æ), medium temperature (41-70¡æ) and high temperature (71-100¡æ). In addition, they can be divided into continuous filament and short fiber; Water soluble conventional fiber and water soluble compound; Single water soluble fiber and multifunctional water soluble fiber (such as hot pressing adhesive properties of water-soluble PvA fiber), etc.
Water-soluble PvA fiber has one important feature that is biodegradable. 30 days to more than 85% biodegradable hitches in activated sludge. So it is a fiber which will not cause environmental pollution.
Melting temperature at 80 ~ 90 ¡æ water soluble PVA short fiber as a special adhesive has a strong demand in papermaking industry. In the paper the fiber to absorb sufficient moisture, then in 70 ~ 90 ¡æ papermaking instantly dissolved in the dryer, and quickly adhesion on the subject of insoluble fiber form the canopy structure, thus improve the strength of the paper. Low temperature and warm water soluble P, and a short fiber is a water-soluble confidential paper making raw material of choice.Lees verder...
Water treatment medicament polyacrylamide
The global market demand of water treatment medicament polyacrylamide is strong growing.
Water treatment is taken seriously by countries around the world, and water treatment chemicals demand is strong growing. At present, the commonly used polyacrylamide(PAM) series polymer flocculant products are very popular on the industry market. China has been the biggest consumer and producer of PAM macromolecule flocculant. Polymer products though the research and development production of the Chinese polyacrylamide manufacturer have been exported to overseas countries. It usually used in oil field exploitation, industrial wastewater and urban domestic wastewater treatment. There will be more Chinese manufacturers involved in export business.Lees verder...
Highly Corrosion Resistant Resin
Vinyl Ester Resins is internationally recognized as highly corrosion resistant resin.
Its development history is less than 40 years, but in the recent more than 20 years. Due to the progress of the synthesis process and technology, new products, new results appear constantly. Its recognized highly corrosion resistant performance, excellent construction technology performance is more and more aroused people's concern, has gradually become a wide selection of corrosion-resistant materials anti-corrosion engineering both at home and abroad
Standard bisphenol A epoxy vinyl resin is made from methyl acrylic acid with bisphenol A epoxy resin was synthesized by vinyl resin, styrene is soluble in solution, the type of resin has the following characteristics:
1. In molecular chain on both ends of the double bond is extremely lively, vinyl resin curing quickly, soon get use intensity, highly corrosive resistant polymer.
2. Esters using methylacrylic acid synthesis, methyl ester bond can play the production effect, to improve the hydrolysis resistance.
3. Resin containing ester bond quantity is very few, per mole ratio of chemical resistant polyester (bisphenol A - fumaric acid UPR) 35-50% less, the alkali resistance performance improvement.
4. The more para hydroxy can improve the wettability of the glass fiber and caking property, can improve the mechanical strength of laminated products.
5. Because only crosslinking on both ends of the molecular, flame retardant vinyl resin commonly used brominated epoxy resin synthesis, due to due to containing bromine in the resin, so the flame retardant vinyl resin in at the same time, with chemical resistance and flame retardant.Lees verder...
What is Metal Cleaning Surfactant
In machining and mechanical equipment, auto maintenance and repair, such as diesel, kerosene or uses mostly gasoline as a cleaning fluid to clean the parts. This not only waste energy, and there are potential unsafe factors, carelessly a bit, could lead to a fire. In recent years, a new type of metal cleaning agent has been widely used, it can be a good alternative diesel, kerosene and gasoline to clean a part and the price is cheap, use safety, very suitable for mechanical cleaning. It can be for metal detergent, and there won't be rusty spot, this is the so-called metal cleaning surfactant.
Metal cleaning surfactants is made up of surfactant and add cleaning agent (such as alkali salt), defoaming agent, spice, etc.
Metal cleaning surfactants are widely used in all kinds of metal material surface, every kind of metal material has targeted cleaner, will not corrode surface materials.Lees verder...
The environmental protection of Titanium Dioxide
Titanium dioxide, as catalyst of optical coating pigment, not only is a kind of environmental safety cleaner, but also can save energy and protect the environment and resources.
Early, Japanese and British scientists used titanium dioxide coated in urban road pavement surface, to be used to clean the air on the road. Titanium dioxide can be blended with asphalt, to reduce the pollutant in the air. When a car passed, concrete or asphalt containing titanium dioxide can purify air, eliminate vehicle emissions of nitrogen oxides by 25% to 45%. Put titania coating on concrete surface, its effect is also significant clean air.Lees verder...
Basic Information about Zwitterionic Polyacrylamide
Zwitterionic polyacrylamide is made up of amide ethylene and vinyl cationic monomer acrylamide monomer, copolymerization hydrolysate. By the infrared spectrum analysis, and the product line not only of acrylamide hydrolysis on the carboxyl negatively charged, and vinyl positive charge. Therefore, a positive charge on the molecular chain and irregular has a negatively charged zwitterionic polymer.
Because zwitterionic polyacrylamide has cationic base and anionic base, it is hydrolysis of copolymerization. The advantage is with the general cationic flocculant.
The use features of zwitterionic polyacrylamide. Used in the acid leaching of ores or from acidic catalyst containing metal recycling valuable metals. Amphoteric ionic is a mixture of anionic and cationic. If the cationic polyacrylamide used with anionic polyacrylamide is produced precipitation. So the zwitterionic product is most ideal.
In the paper industry, as the paper chemicals, the effect of PAM is a single feature cannot be compared, in particular in retention, drainage network side can improve the treatment speed, reduce the loss of the fibrous filler, the wet end system, has a good effect on the degree of paper smoothness, strength, and both sides have poor promotion and compensation.Lees verder...
The development history of Adhesive
Cementing is homogeneous or heterogeneous surfaces connected together by adhesives technology, has the stress distribution of continuous, light weight, or seal, most of the low temperature process. Adhesive is particularly suited to different material, different thickness, ultra-thin specification and connection of complex components.
Adhesive development has entered a long historical process, the human use of adhesives can be traced back to long ago. Found in archaeological excavations, as far back as 600years ago, human beings and clay mixed with water, as adhesive, ceramics and brick, the solid bonding into life appliance such as a stone. China is to find and use one of the earliest countries and adhesives. Ancient times there is a yellow emperor boiled glue story, some ancient books are about adhesive manufacture and use, enough to prove that the use of adhesives in China has a long history.
With production and improvement of living standards, the average molecular structure of resin agent has far cannot satisfy the people in the production and living, the application of the polymer and nanometer materials become an effective way to improve the performance of various materials, macromolecule polymer and nanometer polymer adhesive are important research direction.
Late twentieth century, the developed countries in the world to f the blue line) (1 st companies in the United States as a representative of research and development institutions, has developed on the basis of the polymer material and composite technology of polymer, composite adhesives which is a macromolecule polymer composite and metal or ceramic powder of two-component or multi-component composite material, it can be solved greatly and make up for the weaknesses of the application of metal materials, can be widely used in mechanical parts wear, erosion, corrosion, leakage repair protect, crack, scratch, etc. Polymer composite technology has become one of important application technology modernization adhesives.
Production Methods of D-Tartaric Acid
Firstly, I will introduce the Synthesis of Tartaric Acid
Using 5 parts argol, 1-1.5parts of concentrated hydrochloric acid added 100 parts water, heat to dissolve, and strike filter. Filtrate potassium hydrogen tartrate precipitation after cooling crystallization. Let 20 parts of potassium hydrogen tartrate and 100 parts of 100 degrees Celsius water, slowly add calcium carbonate to the PH value of 7.0, adding calcium chloride calcium tartrate, filtering and washing in cold water clean. 4 times in calcium tartrate precipitation water, then slowly add sulfuric acid solution, filtered to remove the precipitation. The filtrate using activated carbon with 60-70 degrees Celsius decoloring, filtered and 80 degrees Celsius under reduced pressure concentration. Cooling, crystallization and finally not iron container water recrystallization have been finished.
2. Chemical synthesis
Using maleic acid and hydrogen peroxide as raw materials, is converted into oxygen succinic acid under 70 degrees Celsius, and then a quick DL - tartaric acid hydrolysate under 100 degrees Celsius.
3. Cream of tartar method
To wine argol for raw material, the lime milk processing into tartaric acid calcium, then through sulfuric acid acidification can get tartaric acid.Lees verder...
What is Methyl Palmitate
Palmitic acid ethyl ester or Methyl Palmitate is colorless needle crystal. It is insoluble in water, soluble in alcohol, ether, acetone, benzene, chloroform and other organic solvents. In case of fire or hot combustible, used as softener and lubricating oil. Reaction can be made of palmitic acid and anhydrous ethanol.
1, used as softener, lubricant
2, used in organic synthesis
3, used for nuts food
4, it is the allowed edible spices. It often used to make butter, suet, spices, milk, pork and fish with essence. It can also be used for preparation of rum flavour.
The storage method
Store in sealed container, and in a cool, dry place. Storage place must be far away from the oxidant. Storage temperature is -20ºC.
If you want to know more information about natural fatty acid ethyl ester and Methyl Palmitate or Palmitic acid ethyl ester, you can click our website or contact us by telephone, e-mail and fax. We assure high quality and competitive price.
Different types of Polyaluminium Chloride
The polyaluminium chloride that sells on the market are more diverse, because each manufacturer production technology and raw materials, production color have some differences, in general these three colors can be white, yellow, brown, polyaluminium chloride, under the following three different colors to illustrate the difference between uses .
PAC contain two alumina is about 27-30 mostly is soil yellow to yellow yellowish solid powder. These types of polyaluminium chloride solubility in water is better, in the process of dissolving with electrochemical, coagulation, adsorption and precipitation and other physical and chemical changes in the resulting left, so as to achieve the purpose of purification. So in the use of polyaluminium chloride, does not need to add other additives, the flocculation body form a quick and bulky, high activity and precipitation, the high turbidity water purification effect is obvious
White polyaluminium chloride as known as high purity iron white polyaluminium chloride, polyaluminium chloride or food-grade white, compared with other polyaluminium chloride is the highest quality product, the main raw material is high quality aluminum hydroxide powder, hydrochloric acid, and the production process is the most advanced technology of spray drying method. Polyaluminium chloride is used for paper sizing agent, white sugar decoloring clarificant, tanning, medicine, cosmetics, precision casting and water treatment and other fields.
Yellow polyaluminium chloride’s raw material is hydrochloric acid, calcium aluminate powder, bauxite, the main use of sewage disposal and drinking water treatment, when used for water treatment of raw materials is aluminium hydroxide powder, hydrochloric acid, and a bit of calcium aluminate powder, the process is the plate and frame filter or spray drying process, because in drinking water treatment country has strict requirements for heavy metals, and so both raw materials and production process are better than brown polyaluminium chloride. Yellow polyaluminium chloride general drum drying or spray drying tower production and become, flake, powder two solid forms.
Brown polyaluminium chloride’s raw material is calcium aluminate powder, hydrochloric acid, bauxite, iron powder. Production technology is using the drum drying method, generally is mainly used in sewage treatment, because it added iron powder and brown in colour, iron powder added the deeper the color, the more iron powder if over a certain amount of iron in some cases, also known as polyaluminium chloride, has a good effect in increase in sewage treatment.
How much do you know about Benzoyl Chloride
The Production of Benzoyl Chloride
1. Toluene method
Toluene reaction with chlorine in the case of light, side-chain chlorinated generates α-trichloro-toluene, the latter in acidic medium for hydrolysis of benzoyl chloride, and hydrogen chloride gas (HCl gas emitted by appropriate water absorption in production).
2. Benzoic acid with phosgene reaction
Add benzoic acid in photochemical pan, heat melt, in 140-150¡æ ventilation with phosgene, exhaust gas containing hydrogen chloride and reaction was not the phosgene, with empty after alkali treatment, the end of the reaction temperature was 2-3¡æ, driven air vacuum distillation after operation, the finished product. Industrial products for light yellow transparent liquid. Purity is 98% or more. Raw material consumption quota: benzoic acid 920 kg / 1100 kg/t, phosgene, dimethyl formamide 3 kg/t, liquid alkali (30%), 900 kg/t.
In industry, general using benzoic acid and benzene preparation of methylene cross-linked reaction. Benzaldehyde direct chlorination and benzoyl chloride can be obtained.Lees verder...