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Preparation of polyurethane primer: Match polyurethane A and B in a ratio of 1:2 3 (weight ratio) (other coatings are matched according to the proportion specified in product specifications).
When the B material is thicker, it can be diluted with a special diluent, and must not be diluted with acidic or oily diluent, so as not to affect the quality of the original product. In the preparation, should be diluted and stirred for 2-3 minutes, if there is no need to dilute, you can directly use group A and B to distribute and stir for 5-10 minutes, lift the stirrer, you can see that the uniform liquid slowly slides from the container is better, at the same time, it should be noted that the opening material should be immediately covered tightly, so as not to solidify and scrap, and the mixture should be prepared and used according to the actual amount. (Note:.)
When the 991 type is mixed, the first material should be poured into the second material for stirring, which is the opposite of the 911 type and 851 type).
I saw it on an encyclopedia.
Reference address.
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Group A is alkyd resin, acrylic resin, epoxy resin.
Component B contains a -NCO group curing agent.
Example: OH + NCO – NHCOO-
That is, the group ratio is 1:1
Depending on the application, the ratio of primer, topcoat, pouring mold, leather, etc. is 1::.
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Polyurethane is a broad category.
What are you using polyurethane for. There are soft bubbles, hard bubbles, self-cleaning skins, and so on. The ratio of A and B is different depending on the type.
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Summary. Hello dear, happy to answer your <>
Polyurethane is suitable for water diethyl; Polyurethane is generally not suitable for water diethyl esters. This is because polyurethane and water diethyl ester are different in chemical and physical properties that can lead to incompatibility and reactivity between them. First, polyurethane is usually synthesized by the reaction of isocyanate and polyol, while diethyl water is an organic solvent.
The chemical properties of these two compounds are quite different, so they may react or be incompatible with each other. Secondly, polyurethane has a low solubility in water, so it can also be difficult to soluble in organic solvents such as water diethyl, leading to incompatibilities between them. Therefore, if polyurethane needs to be used in water diethylyl, it is advisable to conduct sufficient experiments and tests first to determine the compatibility and suitability between them.
During use, care needs to be taken to prevent possible reactions and safety risks.
Is polyurethane suitable for water diethylester?
Hello dear, happy to answer your <>
Polyurethane is suitable for water diethyl; Polyurethane is generally not suitable for water diethyl esters. This is because polyurethane and water diethyl ester are different in chemical and physical properties that can lead to incompatibility and reactivity between them. First, polyurethane is usually synthesized by the reaction of isocyanate and polyol, while diethyl water is an organic solvent.
The chemical properties of these two compounds are quite different, so they may react or be incompatible with each other. Second, polyurethane has a very low solubility in water, so dissolution in organic solvents such as water diethyl ester can also be difficult to trap, leading to incompatibilities between them. Therefore, if polyurethane is required to be used in the water diethyl medium size hand limbs, it is advisable to conduct sufficient experiments and tests to determine their compatibility and suitability with each other.
During use, care needs to be taken to prevent possible reactions and safety risks. Late life.
Polyurethane is a polymer material composed of polymeric amino acids and isocyanates. It has excellent mechanical properties, abrasion resistance, chemical resistance and weather resistance, so it is widely used in the manufacture of various materials such as plastics, elastomers, foams, coatings, adhesives and royal chain fiber zhenbisunin.
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Good morning, polyurethane.
It is a kind of polyurethane commonly known as PU in our Fengqiao.
It is generally polymerized by polyester polyol and isocyanate to become a rubber-like material with a certain degree of flexibility, and urethane alone is also called ullose, which can be used as another monomer of non-letter socks, polyester and polyslip ether structure. Carbamate and glycolic acid.
Esters and acrylates are similar to catalytic polymerization to produce hardness solids.
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Polyurethane is the full name of polyurethane compound, also often called PU, urethane is generally a two-component PU paint or ink in the state of the A component (modified polyester polyol), the curing agent is usually isocyanate closed derivatives, please refer to it as appropriate. Polyurethane is the abbreviation of polyurethane, which can be used.
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Good morning, polyurethane is a kind of polyurethane commonly known as PU, which is generally polymerized by polyester polyol and isocyanate to become a rubber-like material with a certain degree of flexibility. Carbamate and glycolinate are similar to acrylates and can catalyze polymerization to produce hardness solids.
I just learn to make paper, you don't need any testing, the chemicals used in papermaking, basically no toxicity, otherwise it is low toxicity, so there is basically no big danger, but some additives are not neutral, there is a certain corrosiveness, it is recommended to contact less, and try not to contact **, eyes, oral mucosa, once in contact can be rinsed with water, serious to seek medical attention. If it must be touched, it is recommended to wet a towel with a weak acid and alkali opposite to the acidity and alkalinity, and then perform the relevant operation. Regarding testing, South China can choose South China University of Technology, the Yangtze River Delta can choose Nanlin, Shandong can choose Shandong Light Industry, Beijing-Tianjin-Tang can choose Beilin, Northeast can choose Donglin, Northwest can choose Shaanxi Science and Technology, other colleges and universities have Jiangnan University, Wuhan University, etc., as well as light institutes in various regions, but testing is not recommended, because the toxicity of these things is quite low. >>>More
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The solar disinfection method is suitable for some household products close to the body, such as clothes, shoes, socks, bed sheets, quilt covers, and inapplicable items such as bowls, as well as household electrical products, etc.
If this disease is very healthy and detected early, it is not certain that it will live for a year or two, and this depends on the person's constitution and the situation of the disease.
Yang Zongtao, a second-level inspector of the Ministry of Civil Affairs, said at a press conference of the Ministry of Civil Affairs on December 4 that the provisions of the Civil Code on the cooling-off period system for divorceOnly applicable to divorce by mutual agreement >>>More