There are strong security and ecology requirements to textile in the international market, no matter what differences are between various certification system and textile companies, in order to making it convenient for customers to recognize and buy textile, there are basic security requirements for textile, as the following six aspects:
(1) No VOC( no volatile organic compound)
(2) No FA or low FA( no formaldehyde or low formaldehyde)
(3) No DS( no dangerous chemical substances)
(4) No EH( no environmental hormone)
(5) No PFOS and PFOA( no perfluorooctane and solphone and perfluorooctanic acid)
(6) No AOX( no absorbable organic halogen compound), that is the basic security requirement to textile promoter in domestic and foreign market, that means for the health of human's health and environment, textile should not contain VOC, FA, DS, AOX, EH, PFOS and PFOA.
1.1 No VOC
VOC means volatile organic compound like methylbenzene, dimethylbenzene, styrene, vinyl-cyclohexane, phenylcyclohexane, butadiene, chloroethylene, formaldehyde, aromatic, gas, kerosene, white spirit, polycyclic aromatic hydrocarcons( like tar), they are dangerous for human heath and environment, so that many foreign countries enacted VOC regulation, at present the VOC regulation with widest range is CleanAir Act of America, European Union and Sweden.
In order to having a judgment about quantity to VOC in textile,
it needs quantitative analysis, smell judgment is not good for human health
and accuracy of measurement. At present, the international definition of VOC is
a compound that combined by carbon and one or more nitrogen, oxygen, hydrogen,
sulphur, phosphorous, silicon or halogen( flurrine, chlorine, bromine, iodine),
its steam pressure is more than 0.01 kPa when its temperature is 20 ℃. Sweden not only
takes the steam pressure into consideration but also regulated its boiling
point is ≤240 ℃ without chemical reaction, this is the basic of VOC
quantitative analysis , it is always analyzed by equipment combination.
Pigment printing of textile adopts large VOC process, its amount of mineral oil
up to 35% to 65% in the original soupy complex thickener, the amount of VOC has
already more than the regulated amount, so that powdery thickener, although
the amount of VOC has decreased from 35%-65% to 4%-6%， its machinability(
solubleness and expansiveness) is not good and dust flies, what's more, it is
difficult for viscosity control and adjustment, it also produces gel-particles
to block screen because of inadequate swell, so that powdery thickener is hard
to get popular in the market, the new soupy complex thickener whose basic
carrier is VOC natural oil not only solve the VOC problem but also with
the advantages of soupy complex thickener( includes mineral oil).
Its representative products are Tubivis ECO 650 and Tubivis ECO 400 of CHT company, the former has good economy while the later can meet the highest skill requirement like the stability, permeability and edge sharpness of electrolyte, there is no similar product in China so far. We found a way to solve difficult VOC problem, it is easy to solve other VOC problem about textile promoter.
1.2 No FA or low FA
There is already a regulation about the amount of FA in promoter in domestic and foreign countries, Recently, regulations and law in the international market and the regulations of famous textile retailer are more and more strict in FA. According to these requirement, domestic and foreign textile promoter enterprises are all exploited many low FA (FA amount is ＜75×10-6) and no FA promoter to replace the promoter that contains formaldehyde, like fixer, crease-resistant non-ironing finisher, adhesive, cross-linking agent, disperser, fire retardant and water and oil proofing. Analyzing from the present situation, it already basis and it is possible to produce textile promoter which is no FA or low FA.
1.3 No DS
DS means dangerous chemical substance with low flash point, such as acetone is dangerous chemical substance whose flash point is -20℃. In order to make sure there is no dangerous chemical substance in textile promoter, we all use high flash point and safe chemical substance to produce promoter, like the flash point of dipropylene glycol is 74℃, the flash point of tripropylene glycol methyl ether is 135℃ and the flash point of glycol is 110℃, it is safer to use them to produce textile promoter, such as using kerosene to produce emulsive thickening slurry is flammable and explosive because of its low flash point, now it is replaced by compound thickening slurry which is no mineral oil or low mineral oil, it has increased the safety of pigment printing.
1.4 No EH
There are 70 kinds of EH that are recognized internationally, 26 kinds of them are in connection with textile promoter, like polychlorinated bipheny, alkylphenol, polychlorinated dibenzopdioxin, phthalate easter, the chloration of phenol, organo-tin compound, benzophenone and paranitrotoluene, they take 37% of environmental hormone types. They get into textile promoter in many ways:
(1) It is used for raw material
(2) It is used for finished product
(3) It is used for by-product in the process of producing promoter
(4) It is produced in the process of heating or burning
In recent years, there are some problems that has something to with environmental hormone in inspection. The first is APEO that has something to do with environmental hormone, the second is environmental hormone phthalate easter, it is mainly used for coating finish, soft finish, plasticized plastic printing and pigment dyeing. At present, the production amount of phthalate easter is 15 million t, its apparent consumption is 14 million t and it is used widely. Although there are some substitute like phthalate easter, its performance still needs to be improved. The third environmental hormone is organo-tin compound, it includes 10 types like MBT, DBT, TBT, TeBT, TCyHT, MOT, DOT, TOT, TPhT and TPT, its main types are DBT, TBT, TCyHT, TOT, TPhT and TPT. At present, they are just used as catalyst, stabilizer of polymer in the process of monomer polymerize or anticorrosive coating instead of as bactericide in textile.
It is clear that there are difficulties in producing textile auxiliaries without environmental hormone. We must strengthen technical improvement and reinforce the production of new product , at the same time, focus on examination of new product. The most important point is solving the replacement of alkylphenol ethoxylates and phthalate easter.
1.5 No PFOS and PFOA
PFOS and PFOA are all organofluorine compound, international market is so strict with it, it is a question that worth paying attention to in textile nowadays.
1.6 No AOX
AOX is an English abbreviation of adsorbable organic halide, it refers to organic halide that activated carbon can adsorb. Because AOX will produce cancerogenic substance like PHDDO and PHDF, it is so harmful for human body and environment, many types of textile are belong to AOX, they can be summarized as the following
(1) With halogen organic carrier, such as dichlorobenzene, trichlorobenezene, monochlorotoluene, dichlorotoluene, benzotrichloride.
(2) Chlorinated hydrocarbon solvent, such as 1,1,1-methyl chloroform, 1,2-dichloroethane, 1,1-dichloroethylene, trichloro ethylene, 1,3-dichloropropene, tetrachloroethylene,carbon tetrachloride.
(3) Halogen finishing agent, such as halogen fire retardant TRIS, it refers to (dibromopropyl alcohol) phosphate, PBB means polybrominated biphenyls, PBDPE means pentabromodiphenyl ether, OBDPE means octabromodiphenyl ether,. There are at least 10 types in the market. Felt-proofing agent has wool felt-proofing agent, mothproofing agent has Mitin FF, Eulan U33, mothproofing agent N. Halogen insecticide has DDT that is dichlorodiphenyltrichloroethane, antimycotic antibacterial agent has chlorophenasic acid, halogen fungicide has ASM that is 5.5, dichloro2.2, dyhydroxy diphenylmethane. It involves 30-40 types of important finishing agent.
(4) Halogen pretreatment agent, such as halogen scouring agent, HCFO and chlorine bleach.
(5) PVC ( polyvinyl chloride)
At present, it is difficult to use no halogen organic compound, like several halogen-free carrier that replace of halogen carrier, such as N-methylphthalimide, N-maleimide, Procar DCR, diethylene glycol monobuty ether and N-cyclohexyl-2-pyrrolidone. But there are some problems in promotion and application. The new product is a good loaner with 85% diethylene glycol monobuty ether and 10% N-cyclohexyl-2-pyrrolidone as well as the price. Its good is Swelling agent G, but the problem of recycle is still need to be solved. Fire retardant finishing agent has exploited new product without halogen like bicyclic caged phosphate derivatives fire retardant, organic boron fire retardant, the mixture of organic compound and inorganic nitrogen salt and nitrogen derivative of alkyl phosphate fire retardant. However, the main products in the market are still halogen halide, including adsorbable organic halide. We can that for the safety, in the six basic security requirement of textile promoter, there still many problems in no EH and no AOX, that is also the people's most concerned safety problem.