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solution PC polycarbonate (PC) plastics aging phenomenon method
Date: 2019-07-24 10:15
Views: 4281
Source: Internet
PC polycarbonate (PC) plastics has relatively good heat resistant property and resistant property, in relatively wide temperature degree scope/range inner and wet conditions lower. still its has excellent electrical property can. it dielectric constant and dielectric loss in room temperature 至125℃几乎不变.
PC polycarbonate (PC) plastics disadvantages is easy generate force cracking, chemical resistant agent property relatively 差, high temperature lower easy hydrolysis, and other resin versus property relatively 差.
aging phenomenon is PC polycarbonate (PC) plastics 通病, aldehyde resin 同样存 in, its solid rear 胶层随 time growth, generate crazing and 发生胶层脱落 phenomenon. 胶层愈 thick, crazing phenomenon 愈甚.
引起脲 aldehyde resin viscous agent aging causes has:
(1) resin solid rear still 继续进行 polycondensation water reaction
(2) in solid rear material in still in 游离经甲基, make for/regarding large gas in water separation absorption or 放出, in dry wet lower, shrinkage 一膨胀应 force function lower, 引起胶层 aging
(3) in outer 界因子如 large gas in water, hot, light and other effect/influence lower, resin separation fracture, 导致胶层 aging. in addition, solid agent concentrated degree, add pressure pressure, surface coarse degree and other is resin aging factors.
improvement aging property methods has:
(1) from process requirements by 胶接木材 surface light slip, decrease/reduce 凸凹不平, 以免胶 liquid distribution 不均而形 formed thick 胶层, in table/sheet shrinkage non-uniform lower generate cracking.
(2) for aldehyde resin modified, is make resin crosslinked degree decrease/reduce, property decline, property increase, can add thermoplastic property resin modified, in resin polycondensation add polyethylene (PE) alcohol formed polyethylene (PE) shrink aldehyde modified aldehyde resin, or and thermoplastic property resin (如 poly acid ethylene resin) mixed combined use, this can tool aldehyde resin and poly acid ethylene resin features, increase poly acid ethylene resin resistant water property, meanwhile increase aldehyde resin tough property and property, improvement aldehyde resin viscous agent resistant aging property can. use 20%^-30% poly acid ethylene emulsion and aldehyde resin blending rear used for sheet/plate surface decoration thin wet 贴, can anti 止透胶, also can achieve fast speed 胶贴. another in resin in add amount type material 质, make resin ether 化, can improve/increase resin flexibility property.
(3) in resin in add various filler, powder, small powder, powder, powder and other, this is improvement aldehyde resin aging property, anti 止胶层 due to force function 而引起 crazing 简便而 also has methods.
(4)适当 use solid agent, solid agent acid property strong/high, although can obvious shrink short resin solid time, versus 应 促 make pressure rear resin speed aging, therefore selection solid agent, can decrease/reduce this type of phenomenon, long products use lifespan. generally 以抓化 zinc or iron and other as solid agent, relatively good.
PC polycarbonate (PC) can electroplating and chemical and other surface metal 化 处理. this 就进一步 expand large polycarbonate (PC) plastics application scope.
PC polycarbonate (PC) plastics disadvantages is easy generate force cracking, chemical resistant agent property relatively 差, high temperature lower easy hydrolysis, and other resin versus property relatively 差.
aging phenomenon is PC polycarbonate (PC) plastics 通病, aldehyde resin 同样存 in, its solid rear 胶层随 time growth, generate crazing and 发生胶层脱落 phenomenon. 胶层愈 thick, crazing phenomenon 愈甚.
引起脲 aldehyde resin viscous agent aging causes has:
(1) resin solid rear still 继续进行 polycondensation water reaction
(2) in solid rear material in still in 游离经甲基, make for/regarding large gas in water separation absorption or 放出, in dry wet lower, shrinkage 一膨胀应 force function lower, 引起胶层 aging
(3) in outer 界因子如 large gas in water, hot, light and other effect/influence lower, resin separation fracture, 导致胶层 aging. in addition, solid agent concentrated degree, add pressure pressure, surface coarse degree and other is resin aging factors.
improvement aging property methods has:
(1) from process requirements by 胶接木材 surface light slip, decrease/reduce 凸凹不平, 以免胶 liquid distribution 不均而形 formed thick 胶层, in table/sheet shrinkage non-uniform lower generate cracking.
(2) for aldehyde resin modified, is make resin crosslinked degree decrease/reduce, property decline, property increase, can add thermoplastic property resin modified, in resin polycondensation add polyethylene (PE) alcohol formed polyethylene (PE) shrink aldehyde modified aldehyde resin, or and thermoplastic property resin (如 poly acid ethylene resin) mixed combined use, this can tool aldehyde resin and poly acid ethylene resin features, increase poly acid ethylene resin resistant water property, meanwhile increase aldehyde resin tough property and property, improvement aldehyde resin viscous agent resistant aging property can. use 20%^-30% poly acid ethylene emulsion and aldehyde resin blending rear used for sheet/plate surface decoration thin wet 贴, can anti 止透胶, also can achieve fast speed 胶贴. another in resin in add amount type material 质, make resin ether 化, can improve/increase resin flexibility property.
(3) in resin in add various filler, powder, small powder, powder, powder and other, this is improvement aldehyde resin aging property, anti 止胶层 due to force function 而引起 crazing 简便而 also has methods.
(4)适当 use solid agent, solid agent acid property strong/high, although can obvious shrink short resin solid time, versus 应 促 make pressure rear resin speed aging, therefore selection solid agent, can decrease/reduce this type of phenomenon, long products use lifespan. generally 以抓化 zinc or iron and other as solid agent, relatively good.
PC polycarbonate (PC) can electroplating and chemical and other surface metal 化 处理. this 就进一步 expand large polycarbonate (PC) plastics application scope.
