Shanghai Daoqin Plastics Co., Ltd.

        【 in in 线讯】 day front introduction types aldehyde foam made 备: types is use add hot methods made aldehyde foam, types is modified aldehyde foam made 备. use add hot methods made 备 酚 aldehyde foam, its property can ratio normal temperature foaming has very large 改观: foam pressure shrink strong/high degree relatively normal temperature foaming improve/increase left right, water absorption drop 至原 一 semi, thermal conductivity 由原 0. 033W/mk drop 至0. 028W/mk, foam very uniform, fine 腻. modified aldehyde foam, its property can add hot foaming and normal temperature foaming types aldehyde foam between, can reduce cost. in pipeline temperature field/area has very vast application market. aldehyde foam due to 价廉, is currently outer combined formed foam in development relatively fast product types, in recent years amount speed growth, application scope expand large. 1968 year front world amount also to 1000吨, to 1986 year already formed 40000 吨, 90 year expected to 85000吨. aldehyde foam already formed is “保 temperature material new 候补者”. expert use add hot foaming process made aldehyde foam, make foam ratio normal temperature foaming uniform, fine 腻, 便于施工 and production, foam main/primary property can has relatively large improve/increase, 总之酚 aldehyde foam excellent property can, is in pipeline upper application provide application outlook/prospects.

        一, front 言

        酚 aldehyde foam due to 价廉, is currently outer combined formed foam in development relatively fast product types. in recent years amount speed growth, application scope expand large. 1968 year front world amount also to 1000t, to 1986 year already formed 40000t, 90 year expected to 85000t, aldehyde foam already formed is “保 temperature material new 候补者”. aldehyde foam tool has many advantages:(1) thermal conductivity generally is 0.02～0.04W/mk, 接近于PU hard 泡, excellent currently construction in use PS foam;(2) long use temperature degree generally can 达140～160℃;(3) oxygen index (LOI) generally is 35～50%, 而PU hard generally is 25～28;(4) cost low 廉, engineering ratio polyurethane ester low 30%～50%. in recent years outer for its raw materials, process and equipment 都进行 a large amount of research as, already made tool has high strength, can acid property, has 闷火燃烧 property and relatively low thermal conductivity foam, has force promote aldehyde foam in field/area application.

         most aldehyde foam production process is normal temperature foaming, is aldehyde resin and solid agent mixed combined, mold rear, need add hot 就直接 foaming molding, this process advantages is simple, 方便, can in foaming 但也存 in 不足: foaming time short, large mold and 充模, acid more, foam property can 差. production process 不断完善, 我们尝试 use add hot foaming methods made aldehyde foam, is reduce cost, 开始研 made modified aldehyde foam (using/adopting add hot foaming). use add hot methods made 备 酚 aldehyde foam remove appearance light slip, foam fine outer, its 各方面 property can relatively normal temperature foaming has very large improve/increase. lower specific introduction product made 备情况.

        二, made

        1, raw materials and specifications

        苯酚: separation pure, chemical agent 二厂产, content large 于95%, color crystallization 体.

        甲 aldehyde: analysis pure, chemical industry 三厂产, content 36%～38%, color transparent liquid 体, has property odor.

        尿素: analysis pure, 南京栖霞山化肥厂产, content 99%, color crystallization or white small solid 体.

         catalytic agent: acid and various machine acid.

         surface active property agent: 烷基酚 poly oxygen ethylene ether type.

         foaming agent: composite/compounding foaming agent.

        2, resin combined formed process and foam made 备

        (1) can property resin combined formed (见图1)

        (2) resin foaming (见图2)

        3, foam property can testing

         table/sheet density: standards ASTMDl662

         pressure shrink strong/high degree: standards ISOR844

        测定仪 device: can material experiment/testing machine, ISTRONll85 type; UK ISTRON company manufacturing.

         water absorption: standards ISODPl707

         thermal conductivity: sheet/plate method

         heat stabilized property: foam Sample 准确称 heavy, its 体积然 rear 置于烘箱 in, 于145℃保 temperature 经 一段 time rear cooling room temperature, its and weight its 变化.

        三, and 讨论

         add hot foaming is this process, will resin and various additives (surface active property agent, foaming agent, solid agent)充 separation mixed combined uniform rear, mold rear will mold 放人预先调 good temperature degree in, 待一定 time foam solid full rear 取出, demolding, can to surface light slip, uniform, fine 腻 酚 aldehyde foam products.

         from this process can add hot foaming normal temperature foaming that 样匆忙, it is in temperature degree lower 经 一段 time 熟化, slow, uniform from can property 逐步形 formed foam 体. from property can upper performance in 同样 容 heavy lower, add hot foaming foam pressure shrink strong/high degree obvious high normal temperature foaming foam strong/high degree, water absorption significantly decline, various property can has improve/increase.

         add hot foaming process due to time upper comparison from 容, therefore in application in comparison good 掌握, in foaming process in can use machine 械搅拌代替人工搅拌, this for decrease light strong/high degree, improve/increase product quality large has benefits.