TGIC powder coating curing system of environmental protection and energy saving advantages

1, the introduction of TGIC

TGIC scientific name is three a epoxy propane (2, 3) a were triazine 2 minus 2 (1 h, 3 h, 5 h) three ketone, chemical called melamine urea acid three glycidyl ester, chemical structural formula as shown in figure 1. TGIC the melting temperature of 120 ℃, the viscosity (120 ℃) 0.058 ~ 0.065 Pa s., epoxy equivalent weight of 102109 g/yield, excellent thermal and light stability and weather resistance, and polyester resin has good compatibility, mechanical properties of cured product and good performance, high transparency.

TGIC powder coating curing system of environmental protection and energy saving advantages

TGIC and bisphenol A epoxy resin in the mixed powder coating has A bigger difference. First it relative molecular mass is small, have three groups available for reaction, so as a carboxyl polyester resin curing agent of high crosslinking density; Second, TGIC molecular skeleton on urea ring structure rigidity, make bigger cured paint film, and has a strong light stability; In addition, TGIC molecular nitrogen content as high as 14%, giving coating must be flame retardant and self-extinguishing. TGIC is the earliest, in fact, used for outdoor powder coating of one of the crosslinking agent, it not only provide good weather resistance, excellent resistance to bake yellow degeneration, but also has other satisfactory comprehensive performance, so as a curing agent are widely used in the weathering powder coating. TGIC type aluminum powder coating is widely used in construction, household appliances, furniture, bicycles, outdoor sports facilities and auto parts, and many other fields, to a great extent, replaces solvent coatings.

Say TGIC is a typical weathering powder coating, any newly developed weathering powder coating to compare with them. After more than 20 years of development, with a primary curing agent outdoor weatherability of TGIC powder coating system has developed quite mature, and can provide including highlights, low light, texture, super weather resistance and high, low temperature curing, such as whole series of varieties, which is unmatched by any other weathering powder coating systems. To be sure, in has not yet developed performance can completely replace TGIC before new varieties, it is still the preferred weathering powder coating curing agent.

2, TGIC biological toxicity and safe use

2.1 toxicity problems

2.1.1 biological toxicity

TGIC for biological toxicity issues in question. Europe's results show that some enterprises and institutions TGIC with biological toxicity. But currently open data is quite different, its LD50 value of 400-2000 mg/kg, range is very wide. According to table 1 toxicity classification standard, TGIC pure substance belongs to low toxicity to poisoning.

TGIC powder coating curing system of environmental protection and energy saving advantages

TGIC powder coating formulation in the dosage is very few, from table 2 of conventional polyester/TGIC powder coating formulation, TGIC powder coating in the actual amount is only 4%. Therefore R.F Strobel in animal toxicity of TGIC powder coating is examined, oral toxicity, skin irritation and breathing test pointed out that after prepared with TGIC powder coating the actual non-toxic, acute experimental mice LD50 > 10000 mg/kg. China's anhui province institute of occupational disease prevention and control of test report "TGIC belongs to low toxic substance", the Beijing municipal center for disease control and prevention of test report "TGIC powder coating is a non-toxic" type, the Australian government's industrial chemicals announcement confirms "TGIC belong to low toxic substances, the production and use of TGIC powder coating is safe". The experimental results is easy to understand, when pure substance the half lethal dose of LD. Of 400 mg/kg (poisoning), contains only 4% of the pure substance mixture (assuming that other ingredients are nontoxic) "lethal dose is 10000 mg/kg, namely" actual non-toxic ".

TGIC powder coating curing system of environmental protection and energy saving advantages

2.1.2 genetic toxicity

The data shows, Ames of TGIC respectively detect (pollutants) positive, which have a certain genetic toxicity, the results in mice animal experiments confirmed, but there are no cases of human genetic or cell mutation, so still need to conduct a comprehensive study.

2.1.3 skin irritation

Already confirmed TGIC of stimulus to human skin, eyes, etc, hot and humid environment stimulus. After some personnel contact TGIC itching, hand grasp erythema, ulcer, from healing after contact.

2.1.4 safe use

It is worth noting that TGIC were used as experimental anticancer drugs, experiments prove that it has selective killing effect on cancer cells L1210. Huangshan hua hui fine chemical co., LTD. Is China's major TGIC manufacturers, production for more than 20 years never happened TGIC poisoning, nor TGIC genetic disease. TGIC powder coating is Du Banghua chemical co., LTD. The main varieties, the company also has been associated with TGIC toxicity of occupational disease.

3, TGIC production environmental advantages

From the perspective of the production process of TGIC curing agent, the basic production process for liquid phase and totally enclosed, the product is the main by-product of waste residue and waste water. TGIC manufacturers in China to establish the corresponding waste treatment plant, have passed the certification of the local environmental protection department of the eia, the discharging standard, therefore, in the production of TGIC and won't cause harm to the environment.

4, TGIC powder coating of environmental protection and energy saving advantages

At present, the powder coating has been basically achieve zero emissions, is one of environmentally friendly paint variety, is also one of the global coatings industry development direction. Powder coating production technology has been very mature. Powder coating product yield more than 95%, 5% or less of the production of ultrafine powder waste recycled through the system, could be used for the production of powder coatings, to basic achieve zero emissions, do not produce any harm to the environment.

From the perspective of the coating technology of powder coatings, powder coatings powder on a rate of more than 70%, the overspray powder for powder barrels back after system recovery, and the new powder after mixed in certain proportion, so the comprehensive utilization ratio of powder coating of 95% or more. And the remaining 5% is recycled from waste powder by coating enterprise commonly, to the powder coating factory to processing before using, the basic zero emissions.

As is known to all, solvent-based paint coating thickness generally in about 20 um, to realize the decorative and protective coating, solvent coating often require multiple coating, such as 3 layers, surface coating, in the bottom, each painting are need to be heated after curing, high energy consumption.

, by contrast, the characteristics of TGIC powder coating can be thick coating, coating can be formed only once 60 ~ 120 um thick film, and only a curing coating, thus greatly save the energy consumption of the coating curing. Conventional powder coating curing condition of 180 ~ 200 ℃, 10 ~ 20 min, in order to realize the sustainable development of powder coatings, has developed in recent years can be cured under 135 ~ 140 ℃ of TGIC powder coating, for the sustainable development of the powder coating provides a solid foundation.

5, TGIC powder coating curing system security problems and countermeasures

Already confirmed TGIC powder coating curing system security problem mainly skin irritation to human body.

To solve the safe use of TGIC powder coating is the key to avoid of TGIC powder coating contact with human skin, reduce or control the generation of dust. In fact, when it comes to solid dust in the industrial production, effective industrial dust prevention measures must be taken to control the dust concentration in the air, in order to avoid explosion accidents, occupational diseases and reduce dust and prevent people from pneumoconiosis skin contact with people, so the powder coating and coating production enterprise must have perfect industrial dust control system, in order to realize the safety in production of powder coatings and use.

TGIC production: TGIC upstream production process basic for liquid fully enclosed, there exists no problem of TGIC powder.

TGIC powder coating production: milling process is, TGIC (resin, fillers, additives) charging a premixed and melt extrusion one tablet cooling grinding powder sieving. In this process people may contact with dust generation process is feed and flour. With automatic feeding system, improve the sealing performance of mill and perfect the central dust collection system, can control the concentration of dust in the workshop is far lower than the powder coatings under the explosion limit range of safety, so every standard of powder coating production enterprises can well solve the safe hidden trouble that caused by dust exposure.

Must operation in powder coating can effectively prevent the powder room of the dust, to prevent factory air turbulence effects on powder inside the room rate, also need to establish isolation room, so that the powder room is isolated from the production workshop. With overspray powder recovery system (such as a cyclone separating device) and control the powder room open suction wind speed, all the powder coating can be controlled in the powder room, effectively avoid dust spillover to the production workshop. This not only avoids the dust come into contact with the skin of people, to prevent the occurrence of pneumoconiosis, also can avoid the coating and explosion accident in the job, the safety production of powder coating.

Industrial dust removal system in China in recent years technological advances, blower, dust removal equipment, filtration equipment and filtration material has achieved great progress, strongly promote the powder coating and coating production enterprise in our country's safe production level, has provided the safeguard for related enterprises to eliminate dust hazard.

Six, the concluding

To sum up, TGIC powder coating curing system is not high pollution, high is bad for the environment "combination" products, also do not belong to the ministry backward five types of products, product namely: (1) endanger personal safety production and, does not have the safe production conditions; (2) serious environment pollution and serious destruction of ecological environment; (3) the product does not conform to the stipulations of the state or industry standard; (4) the serious waste of resources and energy; (5) other circumstances stipulated by laws and administrative regulations.

As long as the safety conditions in the reach compliance, TGIC and TGIC powder coating curing system is harmless to the environment, relative to the traditional solvent-based coating, the system of TGIC powder coating has very obvious environmental protection and energy saving advantages. In the powder coating production enterprises conform to the provisions of the state environmental protection measures, such as the central dust collection system measures can effectively avoid dust after contact with the human body, the safety production of TGIC powder coating and use.