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Crosslinking agent for thermosetting resin coatings
2017-8-23 11:18:32
Crosslinking agent for thermosetting resin coatings
Thermosetting resin coating crosslinking agent is also called hardener.
Thermosetting resin crosslinking agent is an essential part of thermosetting resin crosslinking reaction agent for epoxy resin are kinds of itself, and crosslinking agent varieties more, only with epoxy resin and thermosetting resin crosslinking agent by combining different varieties of the two kinds of materials can be different the way of application and performance of different crosslinking products, this is one of the features of epoxy resin applications.
A new solution for the mixture ratio of epoxy resin and crosslinking agent
In theory, one epoxy and one amine hydrogen ratio, in fact, would normally be a little more than epoxy biamines, about 1.2 to 1. This is the principle.
Examples: epoxy-e - 44, epoxy, 0.44, solid content: 70%, crosslinked amine value 240, solid content 60%
Epoxy-equivalent = 100/0.44 = 227.3, amine-hydrogen equivalent = 56,000/240 = 233.3, that should be this ratio, 227.3/0.7:233.3/0.6 = 324.7:388.8? Non-reactive diluents.
For synthetic polyurethane, everyone knows that all of its ingredients are easy to absorb. During the operation, water is often accidentally entered, so the process of degassing is necessary. Small samples can easily absorb a certain amount of moisture that is not conducive to synthesis, so it should take off before any isocyanate reaction in the laboratory. Degassing can be removed by mixing the air. Degassing or drying processes are used in the following formula.
Terathane can serve as a diisocyanate for soft material with general reaction, the world's most commonly used diisocyanate as 4, 4 '- diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI), (2, 4 -; 2, 6-tdi isomers mixed in a mixture of proportions.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
Thermosetting resin coating crosslinking agent is also called hardener.
Thermosetting resin crosslinking agent is an essential part of thermosetting resin crosslinking reaction agent for epoxy resin are kinds of itself, and crosslinking agent varieties more, only with epoxy resin and thermosetting resin crosslinking agent by combining different varieties of the two kinds of materials can be different the way of application and performance of different crosslinking products, this is one of the features of epoxy resin applications.
A new solution for the mixture ratio of epoxy resin and crosslinking agent
In theory, one epoxy and one amine hydrogen ratio, in fact, would normally be a little more than epoxy biamines, about 1.2 to 1. This is the principle.
Examples: epoxy-e - 44, epoxy, 0.44, solid content: 70%, crosslinked amine value 240, solid content 60%
Epoxy-equivalent = 100/0.44 = 227.3, amine-hydrogen equivalent = 56,000/240 = 233.3, that should be this ratio, 227.3/0.7:233.3/0.6 = 324.7:388.8? Non-reactive diluents.
For synthetic polyurethane, everyone knows that all of its ingredients are easy to absorb. During the operation, water is often accidentally entered, so the process of degassing is necessary. Small samples can easily absorb a certain amount of moisture that is not conducive to synthesis, so it should take off before any isocyanate reaction in the laboratory. Degassing can be removed by mixing the air. Degassing or drying processes are used in the following formula.
Terathane can serve as a diisocyanate for soft material with general reaction, the world's most commonly used diisocyanate as 4, 4 '- diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI), (2, 4 -; 2, 6-tdi isomers mixed in a mixture of proportions.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
Terathane can also react with special diisocyanate, such as PPDI, to improve wear resistance, temperature resistance and flexural fatigue performance. For fatty diisocyanate, see the anti-ultraviolet part. Other diisocyanates encounter, and they can react with Terathane, although the rate of reaction is different.
The most common hydrogen donor in polyurethane production is amines and alcohols. When the final product is elastomer, the commonly used chain extender is diamine and diol. Table 2 shows the reaction rate of various amino and hydroxy and phenyl isocyanates. The relative reaction velocity can be selected by the catalyst (see vulcanization time and the catalyst part).
Although "one-step" production of polyurethane elastomers has its advantages (e.g. low cost and fast speed), in most cases, people are willing to choose the "pre-polymerization" route.
The use of prepolymers is beneficial in some production. Although it is more expensive to buy the prepolymer than it is, it can avoid the evaporation of isocyanates during the operation. If prepared to synthesize prepolymers, the following typical procedures are helpful.
Heating 690g (1.38 equivalent) Terathane? 1000 polyether, under 90 ℃, vacuum mixing 1 ~ 2 hours, remove the existing moisture. Under nitrogen protection cooling to 70 ℃. Add 435g (3.5 equivalent) pure MDI.
Heat of reaction makes the temperature rise to 80 + 4 ℃, keep the temperature of 1 ~ 2 hours, to ensure that the reaction completely. In the absence of moisture, the pre-polymer produced by this technique can be stored at room temperature for months.
TDI system performed system are usually prepared at low temperature, TDI in 40 ~ 45 ℃, Terathane? In its usual storage temperature 60 ~ 70 ℃ is more appropriate.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Terathane can also react with special diisocyanate, such as PPDI, to improve wear resistance, temperature resistance and flexural fatigue performance. For fatty diisocyanate, see the anti-ultraviolet part. Other diisocyanates encounter, and they can react with Terathane, although the rate of reaction is different.
The most common hydrogen donor in polyurethane production is amines and alcohols. When the final product is elastomer, the commonly used chain extender is diamine and diol. Table 2 shows the reaction rate of various amino and hydroxy and phenyl isocyanates. The relative reaction velocity can be selected by the catalyst (see vulcanization time and the catalyst part).
Although "one-step" production of polyurethane elastomers has its advantages (e.g. low cost and fast speed), in most cases, people are willing to choose the "pre-polymerization" route.
The use of prepolymers is beneficial in some production. Although it is more expensive to buy the prepolymer than it is, it can avoid the evaporation of isocyanates during the operation. If prepared to synthesize prepolymers, the following typical procedures are helpful.
Heating 690g (1.38 equivalent) Terathane? 1000 polyether, under 90 ℃, vacuum mixing 1 ~ 2 hours, remove the existing moisture. Under nitrogen protection cooling to 70 ℃. Add 435g (3.5 equivalent) pure MDI.
Heat of reaction makes the temperature rise to 80 + 4 ℃, keep the temperature of 1 ~ 2 hours, to ensure that the reaction completely. In the absence of moisture, the pre-polymer produced by this technique can be stored at room temperature for months.
TDI system performed system are usually prepared at low temperature, TDI in 40 ~ 45 ℃, Terathane? In its usual storage temperature 60 ~ 70 ℃ is more appropriate.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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