News Details
The properties of paint crosslinking agent
2017-8-24 16:54:48
The properties of paint crosslinking agent have great influence on toxicity.
For example, whether the crosslinking agent is liquid or solid, the toxic effect is different, the solid is readily attached to the skin, while the liquid has vapor pressure.In general, the chemical activity of crosslinking agent is large, and its biomass activity is strong, which can cause toxicity and seems to be the rule.
The toxicity of crosslinking agents is shown in the following aspects.
1. Acute toxicity.LD50 is generally adopted.The toxicity of amines crosslinking agent is strong.Most of the LD50 values of organic polyamines to the rats' respiratory stimulation were about 1000 ~ 12000ug/g and exposure time of 4 ~ 6h.The irritant of berine and secondary amine is stronger than tertiary amine, and aromatic amine is more toxic than fatty amine.The toxicity of polyphenylenediamine is 10 times stronger than diethylenediamine.Pyridine and piperazine can cause liver and kidney damage and have greater systemic toxicity.Anhydride crosslinking agent is susceptible to dermatitis and is less toxic.
2. Stimulate the skin and mucosa.The toxicity of crosslinking agent is more important in the irritation of the skin and mucous membrane.Because amine is organic alkali, can dissolve in water and adipose, so also can dissolve in the fat of skin, infiltrate, cause dermatitis.Prolonged stimulation, easy to cause the disease of panglosis, occurrence point red spot, formed blister, craze even form flaky, so that the tissue necrosis.Hine and others have conducted detailed research.
Because amines are volatile, their vapors can cause conjunctivitis, tears and corneal edema.Long-term contact with high concentration or high concentration also has obvious stimulation to the respiratory tract, which can cause tracheitis and bronchitis.The acid anhydride class has weak irritant to the skin, but its dust is very strong to the mucous membrane of the respiratory tract such as nose and throat, can cause bronchitis.
3. The allergy of crosslinking agent.So-called allergies, that is, a compound, once the role for human body skin, allergic body formation, in the next or after repeated exposure, not because how much contact, dermatitis can also occur.After such a situation, contact with the allergy compound should be discontinued.The occurrence of allergic reaction is complicated, the pudding experiment is adopted and the animal is studied.The American plastics industry association (SPI) has introduced its own standards.
4. Other toxic effects of crosslinking agent.In addition to the innards of aromatic amine and heterocyclic amine crosslinking agent, it is carcinogenic and has been banned from production and use.The phenylenediamine and diamine diphenylsulfone have been proved to be non-carcinogenic to many toxicology workers, and have been negative in the past.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
For example, whether the crosslinking agent is liquid or solid, the toxic effect is different, the solid is readily attached to the skin, while the liquid has vapor pressure.In general, the chemical activity of crosslinking agent is large, and its biomass activity is strong, which can cause toxicity and seems to be the rule.
The toxicity of crosslinking agents is shown in the following aspects.
1. Acute toxicity.LD50 is generally adopted.The toxicity of amines crosslinking agent is strong.Most of the LD50 values of organic polyamines to the rats' respiratory stimulation were about 1000 ~ 12000ug/g and exposure time of 4 ~ 6h.The irritant of berine and secondary amine is stronger than tertiary amine, and aromatic amine is more toxic than fatty amine.The toxicity of polyphenylenediamine is 10 times stronger than diethylenediamine.Pyridine and piperazine can cause liver and kidney damage and have greater systemic toxicity.Anhydride crosslinking agent is susceptible to dermatitis and is less toxic.
2. Stimulate the skin and mucosa.The toxicity of crosslinking agent is more important in the irritation of the skin and mucous membrane.Because amine is organic alkali, can dissolve in water and adipose, so also can dissolve in the fat of skin, infiltrate, cause dermatitis.Prolonged stimulation, easy to cause the disease of panglosis, occurrence point red spot, formed blister, craze even form flaky, so that the tissue necrosis.Hine and others have conducted detailed research.
Because amines are volatile, their vapors can cause conjunctivitis, tears and corneal edema.Long-term contact with high concentration or high concentration also has obvious stimulation to the respiratory tract, which can cause tracheitis and bronchitis.The acid anhydride class has weak irritant to the skin, but its dust is very strong to the mucous membrane of the respiratory tract such as nose and throat, can cause bronchitis.
3. The allergy of crosslinking agent.So-called allergies, that is, a compound, once the role for human body skin, allergic body formation, in the next or after repeated exposure, not because how much contact, dermatitis can also occur.After such a situation, contact with the allergy compound should be discontinued.The occurrence of allergic reaction is complicated, the pudding experiment is adopted and the animal is studied.The American plastics industry association (SPI) has introduced its own standards.
4. Other toxic effects of crosslinking agent.In addition to the innards of aromatic amine and heterocyclic amine crosslinking agent, it is carcinogenic and has been banned from production and use.The phenylenediamine and diamine diphenylsulfone have been proved to be non-carcinogenic to many toxicology workers, and have been negative in the past.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
The operation of crosslinking agent
1. Replace the toxicity with low toxicity crosslinking agent.
2. Improve the operating environment, consciously draw the operating area and non-operating area, and automate as much as possible, and install ventilation facilities and so on.
3. Strengthen labor protection, use protective gloves, clothing and other methods, avoid crosslinking agent and skin contact.
4. Clean the place in time and keep sanitary.
5. Wash hands, face and other exposed skin in time and should be treated by doctors if the eyes and throat are damaged.
The cross-linking mechanism of UV photocrosslinked powder coating is generally used to generate free radicals with photoinitiator, and free radicals cause unsaturated resins to produce a series of polymerization reactions.
Free radicals can be formed in three different ways by ionization, excitation and electron capture, and then by increasing and terminating the same methods as uv radiation.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The operation of crosslinking agent
1. Replace the toxicity with low toxicity crosslinking agent.
2. Improve the operating environment, consciously draw the operating area and non-operating area, and automate as much as possible, and install ventilation facilities and so on.
3. Strengthen labor protection, use protective gloves, clothing and other methods, avoid crosslinking agent and skin contact.
4. Clean the place in time and keep sanitary.
5. Wash hands, face and other exposed skin in time and should be treated by doctors if the eyes and throat are damaged.
The cross-linking mechanism of UV photocrosslinked powder coating is generally used to generate free radicals with photoinitiator, and free radicals cause unsaturated resins to produce a series of polymerization reactions.
Free radicals can be formed in three different ways by ionization, excitation and electron capture, and then by increasing and terminating the same methods as uv radiation.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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