News Details
Application of peroxide coating crosslinking agent in PVC
2017-5-19 15:43:36
Application of peroxide coating crosslinking agent in PVC
In using peroxide crosslinking in the reaction process of PVC, the first is peroxide, China issued in heat, crack, generating oxygen free radicals, after oxygen free radicals can take PVC macromolecule chain or chlorine atoms of hydrogen, macromolecular free radical formation, coupling between the macromolecular radicals by molecular clinch a deal the cross-links, reaction process is as follows:
The ROOR - 2 ro...
RO - CH2 - CH2 - CH2 - CH2 - CH2 - CHCl.
Or ch2-chcl.
Or ch2-ccl-ch2.
In three types of free radicals (B), it is more likely to trigger the dehcl reaction along the PVC chain, causing the degradation and coloring of PVC. Peroxide crosslinking system research is more initiator dicumyl peroxide (DCP), and the crosslinking agent is acrylic ester, such as trimethylolpropane three methyl acrylate (TMPTMA), etc.
Saethre and Gilbert study found that adopting TMPTMA as crosslinking agent, peroxide as cross-linking agent, crosslinking of PVC process is divided into two steps: TMPT - MA quickly after polymer grafted onto the PVC macromolecule, and crosslinking. TMPTMA's self-aggregation and grafting reactions are caused by peroxide.
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.
None of the peroxide or cross-linking auxiliary agent TMPTMA has been found to be produced by PVC crosslinking. With peroxide and gel content increased with the amount of TMPTMA join rises, with crosslinking temperature rises, the extension of the crosslinking reaction time, also can improve the gel content.
Studies have shown that using peroxide crosslinking of PVC foam, TMPTMA as crosslinking agent, under (177 + 1) ℃, determine the thermal stability of samples, every 20 min to observe the color of the sample. When m (superoxide) : m (TMPTMA) = 1:15, 80min, the color of the sample begins to deepen; When m (superoxide) : m (TMPTMA) = 3:15, 40min, the sample is completely discolored; Already commercialization of PVC foam in (177 + 1) ℃, already all change color within 20 min.
As a result, the thermal stability of a PVC foam with peroxide is much better than the thermal stability of commercial PVC foam. The effect of peroxide on the crosslinking efficiency is mainly expressed in the difficulty of taking the hydrogen or chlorine atoms in the high molecular chain.
Organic peroxide crosslinking of PVC, less in industry application, the main reason is PVC thermal stability is very poor, the decomposition temperature and melting temperature are very close, so the process is very difficult, and process of HCl reaction caused the macromolecular olefin structure and make the products more color.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
In using peroxide crosslinking in the reaction process of PVC, the first is peroxide, China issued in heat, crack, generating oxygen free radicals, after oxygen free radicals can take PVC macromolecule chain or chlorine atoms of hydrogen, macromolecular free radical formation, coupling between the macromolecular radicals by molecular clinch a deal the cross-links, reaction process is as follows:
The ROOR - 2 ro...
RO - CH2 - CH2 - CH2 - CH2 - CH2 - CHCl.
Or ch2-chcl.
Or ch2-ccl-ch2.
In three types of free radicals (B), it is more likely to trigger the dehcl reaction along the PVC chain, causing the degradation and coloring of PVC. Peroxide crosslinking system research is more initiator dicumyl peroxide (DCP), and the crosslinking agent is acrylic ester, such as trimethylolpropane three methyl acrylate (TMPTMA), etc.
Saethre and Gilbert study found that adopting TMPTMA as crosslinking agent, peroxide as cross-linking agent, crosslinking of PVC process is divided into two steps: TMPT - MA quickly after polymer grafted onto the PVC macromolecule, and crosslinking. TMPTMA's self-aggregation and grafting reactions are caused by peroxide.
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.
None of the peroxide or cross-linking auxiliary agent TMPTMA has been found to be produced by PVC crosslinking. With peroxide and gel content increased with the amount of TMPTMA join rises, with crosslinking temperature rises, the extension of the crosslinking reaction time, also can improve the gel content.
Studies have shown that using peroxide crosslinking of PVC foam, TMPTMA as crosslinking agent, under (177 + 1) ℃, determine the thermal stability of samples, every 20 min to observe the color of the sample. When m (superoxide) : m (TMPTMA) = 1:15, 80min, the color of the sample begins to deepen; When m (superoxide) : m (TMPTMA) = 3:15, 40min, the sample is completely discolored; Already commercialization of PVC foam in (177 + 1) ℃, already all change color within 20 min.
As a result, the thermal stability of a PVC foam with peroxide is much better than the thermal stability of commercial PVC foam. The effect of peroxide on the crosslinking efficiency is mainly expressed in the difficulty of taking the hydrogen or chlorine atoms in the high molecular chain.
Organic peroxide crosslinking of PVC, less in industry application, the main reason is PVC thermal stability is very poor, the decomposition temperature and melting temperature are very close, so the process is very difficult, and process of HCl reaction caused the macromolecular olefin structure and make the products more color.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian