Shanghai Daoqin Plastics Co., Ltd.

        导读: PP-R is propylene and ethylene random copolymer, PP-R pipe/tube is 由PP-R resin extrusion molding made formed, 于20世纪80 year 代末90 year development application plastics pipeline product. it its excellent property can and relatively application areas, already in plastics pipe/tube market 占据一席之, is green environmental protection product. is, due to PPR pipeline low temperature resistance property can relatively 差, to pipeline 运输, and use belt/tape 一定 局限 property, especially is in 我国北方 区. therefore, how to improve/increase PPR pipeline low temperature resistance property can, is important.

        一, what is PPR pipeline

        PP-R is random copolymer polypropylene (PP), is 我们 说 Ⅲ type PP. it is propylene mono and a small amount of ethylene mono in add hot, add pressure and catalytic agent function lower random copolymer to, is copolymer PP types. versus for/regarding homopolymer PP, tool has excellent impact property can, is price relatively high.

        PPR pipeline main/primary separation is types: cold water tube/pipe and hot water tube/pipe. not only can used for water tube/pipe pipeline, also can used for pure use water system. cold water tube/pipe and hot water tube/pipe most large difference in tube/pipe thick degree:

        (1) cold water tube/pipe tube/pipe is 2.8-3.5mm, tube/pipe outer has color 标示线;

        (2) hot water tube/pipe tube/pipe is 4.2mm, has color 标示线;

        (3) hot water tube/pipe tube/pipe relatively thick, can substitute/replace cold water tube/pipe use, is cold water tube/pipe is can hot water tube/pipe.

        二, PPR pipeline is what in low temperature property

        PP-R tube/pipe in 5℃ below/following tool has low temperature property, in China large more 数 方冬季 temperature degree in 5℃ below/following, therefore heavy effect/influence its use property can. that is what 会出现 this type of 情况?

        PPR separation structure in ethylene mono machine distribution to propylene long in, its in ethylene mono generally control in 3-5% between. ethylene content and ethylene and propylene polymerization methods its tool has cold property features. is 我们常说 玻璃化转变 temperature degree (Tg). temperature degree relatively low 时, separation structure in separation and by 规定, can 自由 运动, therefore in to outer impact 时, separation between can through 运动, will outer can amount is inner scratch hot can consumption 掉, therefore is low temperature property.

         outer in performance is, in gas temperature relatively low lower (especially in 冬季), pipe/tube in low temperature lower flexibility property has reduce, rigid property reinforcement, performance is property. in outer force impact or large outer function lower, can can pipe/tube cracking and other 情况. and cracking is inner tube/pipe 开始, toward outer tube/pipe 延伸.

        三, low temperature property 危害

         due to pipeline in temperature degree relatively low 时, performance property. therefore, to 运输, and use process in belt/tape 一定 风险.

        (1)冬季运输 process in, pipeline in 运输途 in to outer force 撞击, 导致破裂, effect/influence use property can, therefore need increase measures, this 都会造 formed cost increase;

        (2) in low temperature ring in, to pipeline belt/tape very large 不便, effect/influence efficiency. therefore in 冬季施工时, attention/notes construction to water polypropylene (PP) (PP-R) pipeline low temperature property features, made versus 应施工 solution/scheme.

        (3) most large is in, pipe/tube in 运输, in and process in outer force 致伤, this defect can can use 肉眼无 method to, is in use process in 出现脆 property and tough property (输送 hot water 时)爆 tube/pipe. and safety.

        四, improvement low temperature property methods

        (1) and polyethylene (PE) PE blending , PE low temperature temperature degree can 达-70 degree, add amount PE can 改变PP low temperature resistance property can, is PE添 add amount effect/influence PP product hardness and delamination, PE need is property material most good.

        (2) polyolefin POE toughened , POE tool has thermoplastic property elastomer generally features, density small, heat resistant property, resistant property excellent, use temperature degree scope/range wide 广, is 改变PP low temperature resistance comparison 理想 材 material, usually add 3%-15% can make polypropylene (PP) PP达 to -20 degree, use POE resistant grade toughened PP, not only 改变原 has PP more add low temperature resistance, impact 确定也会 has increase.

        (3) ternary 乙丙橡胶EPDM toughened , EPDM most main/primary features is its excellent resistant oxidation, resistant oxygen and resistant can force and low temperature resistance property, use EPDM resistant pellets 改变PP resistant low temperature property can to -40 degree. cost versus comparison POE high, is property can is method versus ratio.

        (4)PPR can and PPB blending , PPB low temperature temperature degree need ratio PPR need good, add amount PPB can 改变PPR low temperature resistance property can.

        (5)PPR can through 改自身 crystallization methods, pipe/tube low temperature property , main/primary is in production process in pipe/tube cooling temperature degree.