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Used crosslinking agent for coatings
2017-8-2 11:52:31
Used crosslinking agent for coatings
The crosslinking agent is the material that can be crosslinked with the film-forming material to make it dry into film. It is an important auxiliary material which determines the drying of methyl acrylic paint, unsaturated polyester paint, polyurethane paint and amino alkyd paint. The agent is different from the drier, the drier is only to promote the oil absorption capacity in the drying and slow oil paint, making the paint drying faster.
The crosslinking agent is a reactive group in the molecular structure of the molecule, which reacts with the reactive group in the structure of the resin molecule, so that the molecule and the molecule are cross-linked and then interlinked into the membrane. In crosslinked paint, if not added crosslinking agent, the paint will never dry; When the right amount of crosslinking agent is added, it can be completely dry no matter how thick the paint film is.
Different membrane resins should be used in different crosslinking agents. For example, unsaturated polyester paints can be cross-linked with a mixture of benzoyl peroxide and dimethyl aniline; Polyurethane varnish can be used as cross-linking agent for dimethyl ethanolamine or dibutyl tin laurate. Epoxy resin paint can be used as cross-linking agent for ethylene diamine or polyester resin. Use of ammonium chloride as crosslinking agent for urea-formaldehyde resin; The wood is used in acid crosslinked amino alkyd to use hydrochloride alcohol solution as crosslinking agent.
The dosage of crosslinking agent should be suitable, and the dosage should be added according to the required amount of different resin. If the amount of the dosing agent is too much, the paint film or the laminator crosslinking is too fast, easy to appear the disease of fragile and ageing; Crosslinking agent is too little, then paint film or laminator crosslinking slow. Meanwhile, it should be considered according to the high and low temperature.
In order to ensure the quality of the coating, some coatings and crosslinking agents should be put in place for a period of time before construction. If the temperature of the site is low, it can be prepared and cooked in a high temperature place. The curing period is usually 0.5-2h. Some coatings need to be used immediately within a certain period of time, and the paint quality can be guaranteed when the time is finished. Therefore, the use of crosslinking agent should be strictly controlled according to the instructions.
Cashew phenol modified amine crosslinking agent problems of cashew phenol modified amine is derived cashew nut shell of cashew phenol as the main raw material to produce a kind of environmentally friendly low carbon products, small impact on the environment, but also save the resources. This kind of products has been paid more and more attention in epoxy resin crosslinking agent.
Chinese name: Diethyl toluene diamine(DETDA)
The crosslinking agent is the material that can be crosslinked with the film-forming material to make it dry into film. It is an important auxiliary material which determines the drying of methyl acrylic paint, unsaturated polyester paint, polyurethane paint and amino alkyd paint. The agent is different from the drier, the drier is only to promote the oil absorption capacity in the drying and slow oil paint, making the paint drying faster.
The crosslinking agent is a reactive group in the molecular structure of the molecule, which reacts with the reactive group in the structure of the resin molecule, so that the molecule and the molecule are cross-linked and then interlinked into the membrane. In crosslinked paint, if not added crosslinking agent, the paint will never dry; When the right amount of crosslinking agent is added, it can be completely dry no matter how thick the paint film is.
Different membrane resins should be used in different crosslinking agents. For example, unsaturated polyester paints can be cross-linked with a mixture of benzoyl peroxide and dimethyl aniline; Polyurethane varnish can be used as cross-linking agent for dimethyl ethanolamine or dibutyl tin laurate. Epoxy resin paint can be used as cross-linking agent for ethylene diamine or polyester resin. Use of ammonium chloride as crosslinking agent for urea-formaldehyde resin; The wood is used in acid crosslinked amino alkyd to use hydrochloride alcohol solution as crosslinking agent.
The dosage of crosslinking agent should be suitable, and the dosage should be added according to the required amount of different resin. If the amount of the dosing agent is too much, the paint film or the laminator crosslinking is too fast, easy to appear the disease of fragile and ageing; Crosslinking agent is too little, then paint film or laminator crosslinking slow. Meanwhile, it should be considered according to the high and low temperature.
In order to ensure the quality of the coating, some coatings and crosslinking agents should be put in place for a period of time before construction. If the temperature of the site is low, it can be prepared and cooked in a high temperature place. The curing period is usually 0.5-2h. Some coatings need to be used immediately within a certain period of time, and the paint quality can be guaranteed when the time is finished. Therefore, the use of crosslinking agent should be strictly controlled according to the instructions.
Cashew phenol modified amine crosslinking agent problems of cashew phenol modified amine is derived cashew nut shell of cashew phenol as the main raw material to produce a kind of environmentally friendly low carbon products, small impact on the environment, but also save the resources. This kind of products has been paid more and more attention in epoxy resin crosslinking agent.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Cashew phenol modified amide crosslinking agent of yellowing resistance, compatibility, painting, flexibility and other properties have been improved greatly, both the polyamide crosslinking agent and the excellent properties of cashew phenol modified amine crosslinking agent. 5 conclusion to sum up, cashew phenol modified polyamide crosslinking agent is a blend of polyamide crosslinking agent of resistance to yellowing, good flexibility and cashew phenol modified amine crosslinking agent of low viscosity, fast drying, low temperature crosslinking, good resistance to water, is a kind of excellent comprehensive performance of epoxy crosslinking agent, will get more and more widely used in the field of epoxy resin application. In the development trend of environmental protection, safety, high efficiency, improvement of amine based on cashew shell oil crosslinking system to meet the growing market challenges, develop more and better environmentally friendly products, to meet the demand of the market.
Aldehydes can be formaldehyde, polyformaldehyde, trioxane, and other substances that produce formaldehyde. Amine can be a linear fat polyamide, fatty polyamide aromatic ring, fatty ring more or their mixture.
In the preparation of the crosslinking agent, the unreacted phenol content less than 5%, no reaction of amine content less than 35%, amine values are usually within 350 ~ 650 mgkoh/g, the viscosity of no more than 8000 CPS under 25 ℃
Preparation of the crosslinking agent can make any type of epoxy crosslinking, the addition of acrylonitrile can not only effectively reduce the content of free amine, but also can prolong the life of epoxy crosslinking content, significantly improve the maneuverability of the crosslinking agent.
Huafeng jun et al. Preparation of poly (propylene oxide polyamine, main chain of poly (propylene oxide, using polyamine, sealing side, to join the bisphenol A epoxy resin/diethylene mutual amine system, with the increase of its quality, the impact strength of the crosslinked are improved greatly. Zhang Entian et al. The high temperature and high pressure hydrogenation method, the preparation of a shrinkage diethylene glycol (amino propyl) ether and mixed amine, reoccupy catalyst (including piperazine and tertiary amine) was prepared by crosslinking agent can increase in toughness.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Cashew phenol modified amide crosslinking agent of yellowing resistance, compatibility, painting, flexibility and other properties have been improved greatly, both the polyamide crosslinking agent and the excellent properties of cashew phenol modified amine crosslinking agent. 5 conclusion to sum up, cashew phenol modified polyamide crosslinking agent is a blend of polyamide crosslinking agent of resistance to yellowing, good flexibility and cashew phenol modified amine crosslinking agent of low viscosity, fast drying, low temperature crosslinking, good resistance to water, is a kind of excellent comprehensive performance of epoxy crosslinking agent, will get more and more widely used in the field of epoxy resin application. In the development trend of environmental protection, safety, high efficiency, improvement of amine based on cashew shell oil crosslinking system to meet the growing market challenges, develop more and better environmentally friendly products, to meet the demand of the market.
Aldehydes can be formaldehyde, polyformaldehyde, trioxane, and other substances that produce formaldehyde. Amine can be a linear fat polyamide, fatty polyamide aromatic ring, fatty ring more or their mixture.
In the preparation of the crosslinking agent, the unreacted phenol content less than 5%, no reaction of amine content less than 35%, amine values are usually within 350 ~ 650 mgkoh/g, the viscosity of no more than 8000 CPS under 25 ℃
Preparation of the crosslinking agent can make any type of epoxy crosslinking, the addition of acrylonitrile can not only effectively reduce the content of free amine, but also can prolong the life of epoxy crosslinking content, significantly improve the maneuverability of the crosslinking agent.
Huafeng jun et al. Preparation of poly (propylene oxide polyamine, main chain of poly (propylene oxide, using polyamine, sealing side, to join the bisphenol A epoxy resin/diethylene mutual amine system, with the increase of its quality, the impact strength of the crosslinked are improved greatly. Zhang Entian et al. The high temperature and high pressure hydrogenation method, the preparation of a shrinkage diethylene glycol (amino propyl) ether and mixed amine, reoccupy catalyst (including piperazine and tertiary amine) was prepared by crosslinking agent can increase in toughness.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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