News Details
Polyurethane coating crosslinking agent
2017-4-13 23:06:43
Polyurethane coating crosslinking agent, a brief introduction on lower isocyanate crosslinking agent in the organic solvent and swim divorced cyanate ester monomer content in the progress.
Polyurethane coating on the impact of environment mainly from two aspects: one is the coating contains harmful solvents; Secondly, cross-linking agent in the swim divorced cyanate ester monomer. Isocyanate crosslinking agent is an important component of polyurethane coating. Environment friendly and crosslinking agent, refers to the contains no or only a small amount of the harmful material coating cross-linking agent.
Environmentally friendly isocyanate crosslinking agent polyurethane coating crosslinking agent is the main development direction. The harm of solvents and swim divorced cyanate ester monomer and its countermeasures. The traditional coating crosslinking agent is prepared with organic solvent, in use process, there will be solvent evaporation into the atmosphere, causing air pollution. Most organic solvents are toxic chemicals.
Polyurethane coating crosslinking agent used in organic solvents such as toluene poisoning to human body is bigger, it will destroy the human body function of hematopoietic system, other solvents have different levels of toxicity, harm to human health. So, in order to reduce the negative impact of the organic solvent to the human body and environment, people have begun to reduce the dosage of the organic solvent, developing high solid content or containing no organic solvent polyurethane coating and its crosslinking agent.
Polyurethane coating in the industry, the use of isocyanate crosslinking agent mainly toluene diisocyanate (TDI) or six methylene diisocyanate (HDI) basis. The former belongs to the aromatic yellow variant, general is solvent; While the latter belongs to the aliphatic not yellow variant, does not contain solvents.
The dangers of isocyanate, has always been the concern of the people. Isocyanate is a toxic chemicals, the chemical nature very lively, easy to react with other compounds containing active hydrogen atoms. Isocyanate is more dangerous to the human body is that it can react with the body's protein, make protein denaturation.
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.
It has strong tear of steam; After inhalation to stimulate the respiratory system, cause a dry cough, sore throat. Long-term inhaled trace diisocyanate will cause headache, bronchitis and asthma. Serious can lead to death. In order to avoid the isocyanate steam, the harm of human body rules in every country in the diisocyanate maximum allowable concentration in the air.
The us national institute of occupational safety and protection (NIOSH) is stricter rules limiting concentration in the workplace for 5 > 10 to 9, with TDI limit per cubic meter of the atmosphere of 35! G, MDI 50! G, HDI of 35! G, IPDI to 45! G, HMDI for 55! G.
China's rules in the air of workplace TDI maximum allowable concentration of 0.2 mg/m3, and toluene diisocyanate as highly hazardous substance to human body health. In order to eliminate because of excessive amounts of toluene diisocyanate on source and the harm to human body, the restriction on free monomer content in polyurethane coating.
The ec regulation, for example, TDI, HDI IPDI, HMDI chemicals, such as the outer wall of the container must be posted signs: free diisocyanate monomer mass fraction below 0.5%, the outer wall marked "containing isocyanate"; Free monomer content in 0.5% ~ 2.0%, indicating "harmful" warning signs and containing isocyanate; Free monomer content in 2% above, in addition to the marked "containing isocyanate," must be marked "toxic" with skull bones.
China produces the basic is aromatic solvent coating, polyurethane coating using diisocyanate usually TDI. In recent years, developed countries in coating environmental protection compulsory standards, the national standard Gb18581-2001 "interior decoration decorates material harmful material in solvent wood coatings limited" specified in the nitro paint, polyurethane paint and alkyd paint wood coatings in the harmful material (formaldehyde, benzene series, TDI and other volatile organic compounds) limit.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Polyurethane coating on the impact of environment mainly from two aspects: one is the coating contains harmful solvents; Secondly, cross-linking agent in the swim divorced cyanate ester monomer. Isocyanate crosslinking agent is an important component of polyurethane coating. Environment friendly and crosslinking agent, refers to the contains no or only a small amount of the harmful material coating cross-linking agent.
Environmentally friendly isocyanate crosslinking agent polyurethane coating crosslinking agent is the main development direction. The harm of solvents and swim divorced cyanate ester monomer and its countermeasures. The traditional coating crosslinking agent is prepared with organic solvent, in use process, there will be solvent evaporation into the atmosphere, causing air pollution. Most organic solvents are toxic chemicals.
Polyurethane coating crosslinking agent used in organic solvents such as toluene poisoning to human body is bigger, it will destroy the human body function of hematopoietic system, other solvents have different levels of toxicity, harm to human health. So, in order to reduce the negative impact of the organic solvent to the human body and environment, people have begun to reduce the dosage of the organic solvent, developing high solid content or containing no organic solvent polyurethane coating and its crosslinking agent.
Polyurethane coating in the industry, the use of isocyanate crosslinking agent mainly toluene diisocyanate (TDI) or six methylene diisocyanate (HDI) basis. The former belongs to the aromatic yellow variant, general is solvent; While the latter belongs to the aliphatic not yellow variant, does not contain solvents.
The dangers of isocyanate, has always been the concern of the people. Isocyanate is a toxic chemicals, the chemical nature very lively, easy to react with other compounds containing active hydrogen atoms. Isocyanate is more dangerous to the human body is that it can react with the body's protein, make protein denaturation.
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.
It has strong tear of steam; After inhalation to stimulate the respiratory system, cause a dry cough, sore throat. Long-term inhaled trace diisocyanate will cause headache, bronchitis and asthma. Serious can lead to death. In order to avoid the isocyanate steam, the harm of human body rules in every country in the diisocyanate maximum allowable concentration in the air.
The us national institute of occupational safety and protection (NIOSH) is stricter rules limiting concentration in the workplace for 5 > 10 to 9, with TDI limit per cubic meter of the atmosphere of 35! G, MDI 50! G, HDI of 35! G, IPDI to 45! G, HMDI for 55! G.
China's rules in the air of workplace TDI maximum allowable concentration of 0.2 mg/m3, and toluene diisocyanate as highly hazardous substance to human body health. In order to eliminate because of excessive amounts of toluene diisocyanate on source and the harm to human body, the restriction on free monomer content in polyurethane coating.
The ec regulation, for example, TDI, HDI IPDI, HMDI chemicals, such as the outer wall of the container must be posted signs: free diisocyanate monomer mass fraction below 0.5%, the outer wall marked "containing isocyanate"; Free monomer content in 0.5% ~ 2.0%, indicating "harmful" warning signs and containing isocyanate; Free monomer content in 2% above, in addition to the marked "containing isocyanate," must be marked "toxic" with skull bones.
China produces the basic is aromatic solvent coating, polyurethane coating using diisocyanate usually TDI. In recent years, developed countries in coating environmental protection compulsory standards, the national standard Gb18581-2001 "interior decoration decorates material harmful material in solvent wood coatings limited" specified in the nitro paint, polyurethane paint and alkyd paint wood coatings in the harmful material (formaldehyde, benzene series, TDI and other volatile organic compounds) limit.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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