The role of carbodiimide crosslinker, what is the difference between crosslinker and diethanolamine

Polycarbide diimide.

It is a new type of crosslinker in the coating industry.

Since it can be emulsified in water by introducing hydrophilic groups, it can be used for crosslinking of water-dispersible finishes. When using polycarbide diimide crosslinkers, the finishing agent is required to have an active group carboxyl group that reacts with the carbodiimide group.

Most water-dispersible finishing products improve the stability of the emulsion by introducing a carboxyl group. Polycarbodiimide can react with carboxyl groups at room temperature and has a good pot life.

Polycarbodiimide crosslinker is made by bifunctional isocyanate.

Formed by polycondensation under the action of catalyst, a small amount of alcohols and amines can be used to adjust its molecular weight, and the aqueous dispersion of polycarbidiimide crosslinker is obtained by introducing hydrophilic groups.

Because the polycarbide diimide crosslinker can be cured quickly at room temperature and has the advantage of low toxicity, an aqueous dispersion can be generated by introducing a hydrophilic group, which can be well mixed with aquatic coatings. High efficiency, low toxicity and sufficient retention time make polycarbodiimide an effective way for the development of high-performance water-soluble finishing agents. ～～

The data were retrieved from the VIP database "Performance and Research Progress of Polycarbide Diimide Crosslinkers".

Polycarbidiimide is a new type of crosslinking agent in the coating industry, which can be used for crosslinking of water-dispersible coatings because it can self-emulsify in water. The cross-linked coating has good solvent resistance, water resistance and anti-fouling properties, excellent wear resistance and light resistance, and high hardness. The low toxicity of water-soluble polydiimide, good membrane properties, low toxicity, water solubility, rapid aging hardening, and sufficient retention time make polydiimide provide an effective way for the development of high-performance water-soluble finishing agents

Synthesis and performance of carbodiimide-type crosslinker".

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Summary. Diethanolamine is used as an analytical reagent, an acid gas absorber, used for the purification of coking gas and other industries, and can be recycled. It is also used in the preparation of detergents, polishing agents, lubricants, softeners, surfactants, etc., and can also be used in organic synthesis.

Diethanolamine is used as an analytical reagent, an acid gas absorber, used for the purification of coking gas and other industries, and can be recycled. It is also used in the preparation of detergents, polishing agents, lubricants, softeners, surfactants, etc., and can also be used in organic synthesis.

Can you add, I don't quite understand it.

Crosslinkers are mainly used in polymer materials. Because the molecular structure of polymer materials is like a long line, the strength is low when there is no cross-linking, easy to break, and there is no elasticity, the role of the cross-linking agent is to form chemical bonds between the first-type molecules, so that the linear molecules are connected to each other to form a network structure, so as to improve the strength and elasticity of rubber.

Polycarbide diimide.

It is a new type of crosslinker in the coating industry.

As it can be emulsified in water by introducing hydrophilic groups.

Therefore, it can be used for crosslinking of water-dispersible finishing agents. When using polycarbide diimide crosslinkers, the finishing agent is required to have an active group carboxyl group that reacts with the carbodiimide group, and most water-dispersible finishing agent products improve the stability of the emulsion by introducing a carboxyl group. Polycarbodiimide can be.

It reacts with the carboxyl group at room temperature and has a good application life.

Polycarbodiimide crosslinker is passed by a double body.

The energy group isocyanate is condensed and generated by the action of a catalyst.

A small amount of alcohol can be used.

Amine tones.

The molecular mass is reduced by the introduction of hydrophilic groups.

to the aqueous dispersion of polycarbide diimide crosslinker.

Since polycarbide diimide crosslinkers can be found in.

It cures quickly at room temperature and has the advantage of low toxicity.

Aqueous dispersions can be generated by introducing hydrophilic groups.

It is better mixed with aquatic paint. Efficient

Low toxicity and sufficient retention time make polydiimide high.

The development of properties of water-soluble finishing agents provides effective.

Way. The data were retrieved from the VIP database "Performance and Research Progress of Polycarbide Diimide Crosslinkers".

Polycarbis. Imine is a new type of crosslinker in the coating industry, because it can be in water.

to self-emulsify. Hence available.

Cross-linking of water-dispersible coatings. Coating after crosslinking.

Solvent resistance.

Water resistance and stain resistance are very good, abrasion resistance,

The lightfastness is excellent, and the hardness is also relatively high.

High.... Water-soluble polycarbide diimide is more toxic.

Small, good membrane properties

Low toxicity, water solubility,

Rapid aging hardening

Sufficient retention time for polycarbidiimide for the development of high-performance water-soluble finishing agents.

exhibition provides an effective way

Synthesis and performance of carbodiimide-type crosslinker".

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Summary. For the chemical crosslinking of polyurethane foams, the way in which it is achieved is mainly covalent bonding. Reactive isocyanates react with many functional groups.

Generally speaking, a small molecule substance with two such functional groups is called a chain extender, and a small molecule substance with more than two such functional groups is called a cross-linking agent, because the former can make the matrix molecular backbone longer, and the latter makes the matrix molecular chain easier to form a network structure. The combination of chain extender and cross-linking agent can speed up the curing process of the foam, the degree of cross-linking of the molecular network becomes higher, and the cross-linking points are evenly distributed, so as to obtain the foam with high density and small porosity, so as to improve its mechanical properties.

For the chemical files that are ordered in polyurethane foam, the realization method is mainly covalent bonds. Reactive isocyanates react with many functional groups. Generally speaking, a small molecule substance with two such functional groups is called a chain extender, and a small molecule substance with more than two such functional groups is called a cross-linking agent, because the former can make the matrix molecular backbone longer, and the latter makes the matrix molecular chain easier to form a network structure.

The combination of chain extender and cross-linking agent can speed up the curing process of the foam, the degree of cross-linking of the molecular network becomes higher, and the cross-linking points are evenly distributed, so as to obtain the foam with high density and small porosity, thereby improving its mechanical properties.

Fellow, I really didn't understand, I can be more specific.

The increase of chain extender will make the molecular backbone longer, the activity capacity will be enhanced, and the energy can be absorbed through the movement of the chain segment when subjected to external force, and the elasticity and toughness of the foam will be improved, but the rigidity will be reduced. The increase of cross-linking agent increases the permeability of the cross-linked dense cherry tree in the system, the movement of the chain segment is blocked, the ability to maintain the body structure is enhanced, and the ability to resist large external forces is increased, and the strength of the foam becomes greater and the flexibility becomes worse. However, there are some hydrogen bonds in the foam, and the increase of cross-linking density will lead to the enhancement of chain separation, and the gravitational effect of non-covalent bonds between molecules will cause the damage caused by the increase of chemical cross-linking.

At the same time, due to the introduction of cross-linking, the regularity of the molecular chain is destroyed, and the crystallization ability of the soft section of polyurethane foam is reduced. These effects will sell the relative decline in the strength of the foam, so the amount of crosslinker should not be too large. The combination of chain extender and crosslinker can obtain foam with excellent comprehensive properties.

Alcohol chain extenders and crosslinkers commonly used diol chain extenders and curing agents mainly include 1,4-butanediol, ethylene glycol, ethylene glycol, 1,6-hexanediol, HQEE, etc. Commonly used polyol crosslinkers are glycerol, trimethylolpropane, pentaerythritol and low molecular weight polyether polyols. Dimethylolpropionic acid, dihydroxymethylbutyric acid and some homemade carboxyglycols are a class of chain extenders containing hydrophilic groups for the preparation of waterborne polyurethanes.

Summary. Diethanolamine is used as a raw material for buffers in the pharmaceutical industry and as a crosslinker in the production of high-resilience polyurethane foams. Diethanolamine is also known as 2,2'-dihydroxydiethylamine, which is a colorless, viscous liquid at room temperature, slightly ammonia-like, soluble in water and ethanol;

It is used as a raw material for buffers in the pharmaceutical industry and as a crosslinker in the production of high-resilience polyurethane foams.

Diethanolamine is used as a raw material for buffers in the pharmaceutical industry and as a crosslinker in the production of high-resilience polyurethane foams. Diethanolamine is also known as 2,2'-dihydroxydiethylamine, which is a colorless, viscous liquid at room temperature, slightly ammonia-like, soluble in water and ethanol;It is used as the original material for buffer hall disturbance in the pharmaceutical industry, and as a cross-linking agent in the production of high-resilience polyurethane bubble foam.

Can you elaborate on that a little bit more?

Diethanolamine is used as a raw material for buffers in the pharmaceutical industry and as a crosslinker in the production of high-resilience polyurethane foams. Diethanolamine is also known as 2,2'-dihydroxydiethylamine, which is a colorless, viscous liquid at room temperature, slightly ammonia-like, soluble in water and ethanol;It is used as the original material for buffer hall disturbance in the pharmaceutical industry, and as a cross-linking agent in the production of high-resilience polyurethane bubble foam.

Summary. Diethanolamine, chemical agent, Chinese name 2,2-Dihydroxydiethylamine, diethanolamine; Dis(hydroxyethylamine); 2,2-Iminobiethanol: Abbreviated as DEA.

Colorless viscous liquid or crystalline. It is alkaline and can absorb gases such as carbon dioxide and hydrogen sulfide in the air.

Diethanolamine, chemical agent, Chinese name Dong Hidden Silver is called 2,2-dihydroxydiethylamine, diethanol carries amine; Dis(hydroxyethylamine); 2,2-Iminobiethanol: Abbreviated as DEA. Colorless viscous liquid nayana body or crystal.

It is alkaline and can absorb gases such as carbon dioxide and hydrogen sulfide in the air.

Can you add, I don't quite understand it.

Performance and advantages of diethanolamine: It is a colorless, viscous liquid at room temperature, slightly ammonia-like, soluble in water and ethanol. It can corrode copper, aluminum and its alloys.

Liquid and vapor corrosion** and eye wandering. It can react with a variety of acids to form stalkate esters and amide salts. World mill and boiling point, melting point 28.

Diethanolamine uses: suitable for raw materials for corrosion inhibitors in the pharmaceutical industry; It is used as a crosslinker in the production of highly resilient polyurethane foams. mixed with triethanolamine as a decaking agent for aircraft engine pistons; It reacts with fatty acids to produce alkyl alcohol amides.

It is suitable for raw materials for organic synthesis, raw materials for the production of surfactants and acid gas absorbents.