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Organic acid anhydride type paint crosslinking agent
2017-7-8 16:03:46
Organic acid anhydride type paint crosslinking agent
The organic acid anhydride type crosslinking agent contains acid anhydride in the molecular structure. The individual acid anhydride crosslinking agent also contains carboxyl, ether and ester, and the active hydrogen on nitrogen atom is not included. The nature of the crosslinking agent is completely different. Most of the acid anhydride is less volatile, the physiological toxicity is low, the skin irritant is small. A few other kinds of maleic anhydride and phthalic anhydride are excluded.
Organic acid anhydride type with large amount of crosslinking agent and epoxy resin, crosslinking at room temperature is slow, can't completely crosslinked resin, need after high temperature heating crosslinking, therefore, a longer shelf life at room temperature, crosslinking slow, crosslinking shrinkage of small, crosslinking content higher heat distortion temperature, heat resistant performance is good, the mechanical and electric properties, so use such more crosslinking agent in the field of electrical insulation. Because the cross-linking structure contains esters, organic acids and inorganic acids are good, but they are less alkaline.
The deficiency of organic anhydride type crosslinking agent:
(1) hygroscopic anhydride is easy to absorb moisture in the air, and reacts with it to form free acid, which makes the acid anhydride muddy and impedes the crosslinking reaction. In the case of acid anhydride, we should try to control acid anhydride and air contact small, short time, avoid high humidity environment, and the container is well sealed.
(2) to take off the carbon dioxide reaction anhydride in the presence of individual heating or tertiary amine, can cause to take off the carbon dioxide reaction, the release of carbon dioxide causes increased anhydride container packing pressure phenomenon, make the crosslinking content within pinhole, carbon dioxide, increase anhydride equivalent and viscosity increased.
Acid anhydride crosslinking agent can be divided into: aromatic anhydride, esters, fatty acid anhydride, acid anhydride and anhydride addition, etc.
Aromatic acid anhydride has the benzene ring in its molecular structure. The crosslinking object has good heat resistance, high thermal deformation temperature and excellent electrical performance. But because both are solid, melting point is high, operate inconveniences.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The organic acid anhydride type crosslinking agent contains acid anhydride in the molecular structure. The individual acid anhydride crosslinking agent also contains carboxyl, ether and ester, and the active hydrogen on nitrogen atom is not included. The nature of the crosslinking agent is completely different. Most of the acid anhydride is less volatile, the physiological toxicity is low, the skin irritant is small. A few other kinds of maleic anhydride and phthalic anhydride are excluded.
Organic acid anhydride type with large amount of crosslinking agent and epoxy resin, crosslinking at room temperature is slow, can't completely crosslinked resin, need after high temperature heating crosslinking, therefore, a longer shelf life at room temperature, crosslinking slow, crosslinking shrinkage of small, crosslinking content higher heat distortion temperature, heat resistant performance is good, the mechanical and electric properties, so use such more crosslinking agent in the field of electrical insulation. Because the cross-linking structure contains esters, organic acids and inorganic acids are good, but they are less alkaline.
The deficiency of organic anhydride type crosslinking agent:
(1) hygroscopic anhydride is easy to absorb moisture in the air, and reacts with it to form free acid, which makes the acid anhydride muddy and impedes the crosslinking reaction. In the case of acid anhydride, we should try to control acid anhydride and air contact small, short time, avoid high humidity environment, and the container is well sealed.
(2) to take off the carbon dioxide reaction anhydride in the presence of individual heating or tertiary amine, can cause to take off the carbon dioxide reaction, the release of carbon dioxide causes increased anhydride container packing pressure phenomenon, make the crosslinking content within pinhole, carbon dioxide, increase anhydride equivalent and viscosity increased.
Acid anhydride crosslinking agent can be divided into: aromatic anhydride, esters, fatty acid anhydride, acid anhydride and anhydride addition, etc.
Aromatic acid anhydride has the benzene ring in its molecular structure. The crosslinking object has good heat resistance, high thermal deformation temperature and excellent electrical performance. But because both are solid, melting point is high, operate inconveniences.
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.
Phthalic anhydride (PA) : molecular weight 148, white powder, melting point 128 ℃. Phthalic anhydride in the crosslinking of the heat is small, the application period is long. Solid resin heating to 120 ~ 124 ℃, first joined the phthalic anhydride, high temperature and acid anhydride can sublimate, therefore, operation to quickly; Liquid resin mixture can be heat preservation in 60 ~ 70 ℃, lower than 60 ℃ anhydride can precipitate, crosslinking promoter can be added, can prolong resin applicable period. The electrical properties of crosslinking are excellent, except for the poor alkali resistance, good drug resistance and suitable for the laminated materials and large casting parts of medium temperature crosslinking.
The addition of phthalic anhydride and diethylene triamine (pa-deta)
Partial benzene anhydride (TMA) : top three relative molecular mass, 192 can be used as plasticizer TOTM (trimellitic acid three dioctyl), raw material of the wire and cable with some internal resin, epoxy resin, crosslinking agent and dye, coating, adhesives, etc. The content of TMA is 30 ~ 33 percent for bisphenol A epoxy resin, and its crosslinking properties are excellent, especially the heat resistance, mechanical, electric and drug resistance. Due to the high melting point, the process is not good.
Even without the accelerant, it has beneficial carboxylic acid, which also has the effect of promoter, so it can be used short, which can be used as a fast crosslinked heat resistant composition. In order to improve the time and the difficulty of operation, TMA can be mixed with other anhydride (such as HHPA and MNAH), which can obviously improve its technology.
Slant is third benzene anhydride ethylene glycol ester and glyceride are solid, melting point 90 ℃ in the structure of two kinds of anhydride containing ester bond, more than partial third benzene anhydride base, 1 ~ 2 anhydride and crosslinking the crosslinking density of content is high, a variety of excellent performance. Both of these acids are less hydrolytic than TMA.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Phthalic anhydride (PA) : molecular weight 148, white powder, melting point 128 ℃. Phthalic anhydride in the crosslinking of the heat is small, the application period is long. Solid resin heating to 120 ~ 124 ℃, first joined the phthalic anhydride, high temperature and acid anhydride can sublimate, therefore, operation to quickly; Liquid resin mixture can be heat preservation in 60 ~ 70 ℃, lower than 60 ℃ anhydride can precipitate, crosslinking promoter can be added, can prolong resin applicable period. The electrical properties of crosslinking are excellent, except for the poor alkali resistance, good drug resistance and suitable for the laminated materials and large casting parts of medium temperature crosslinking.
The addition of phthalic anhydride and diethylene triamine (pa-deta)
Partial benzene anhydride (TMA) : top three relative molecular mass, 192 can be used as plasticizer TOTM (trimellitic acid three dioctyl), raw material of the wire and cable with some internal resin, epoxy resin, crosslinking agent and dye, coating, adhesives, etc. The content of TMA is 30 ~ 33 percent for bisphenol A epoxy resin, and its crosslinking properties are excellent, especially the heat resistance, mechanical, electric and drug resistance. Due to the high melting point, the process is not good.
Even without the accelerant, it has beneficial carboxylic acid, which also has the effect of promoter, so it can be used short, which can be used as a fast crosslinked heat resistant composition. In order to improve the time and the difficulty of operation, TMA can be mixed with other anhydride (such as HHPA and MNAH), which can obviously improve its technology.
Slant is third benzene anhydride ethylene glycol ester and glyceride are solid, melting point 90 ℃ in the structure of two kinds of anhydride containing ester bond, more than partial third benzene anhydride base, 1 ~ 2 anhydride and crosslinking the crosslinking density of content is high, a variety of excellent performance. Both of these acids are less hydrolytic than TMA.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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