Shanghai Daoqin Plastics Co., Ltd.

         most production more is 陶瓷砂轮, 陶瓷结 combined agent advantages is its more and chemical stability property good, suitable for dry abrasion and wet abrasion, especially is use water and abrasion liquid conditions lower. is, 陶瓷砂轮 elastic property relatively 差, and need very high temperature degree, made it development. aldehyde resin combined agent tool has elastic property good, for 震荡, impact, pressure property small advantages. its high stability property make its can 够适应 relatively high speed and improve/increase abrasion property can, especially suitable for abrasion 削砂轮 and 切割砂轮, it good elastic property make its suitable for ultra- 精确 abrasion and surface light.

        酚 aldehyde resin combined agent production process main/primary has cold pressure process, semi hot pressure process and hot pressure process types.

        1． cold pressure process:

         cold pressure process use combined agent has wetting agent and powder resin, usually used as wetting agent has liquid aldehyde resin, aldehyde, alcohol, and other, use most more is liquid aldehyde resin. liquid resin and powder resin use ratio/proportion (usually liquid powder ratio) factors has:

         abrasion material degree distribution, filler type type, filler use amount, liquid resin viscosity, powder resin property and other. if liquid resin viscosity large, full abrasion material surface need more more liquid resin; abrasion material and filler degree small, its ratio surface 积就越 large, liquid use amount 也就越 more; powder resin molecular weight high, 游离酚越 low, its and liquid resin force 就越差, need liquid amount more. above types 情况均需 improve/increase liquid powder ratio. generally use liquid resin as wetting agent, liquid powder ratio selection 1: 2—1: 4, use aldehyde or alcohol and mixed combined material as wetting agent, liquid powder ratio selection 1: 6—1: 8.

         mixed material machine need process 验证, can to mixed combined and loss bad abrasion material is 佳. add fine powder rear mixed material time generally is 2—5 separation 钟, short can ensure mixed material uniform, long resin film easy 脱落, and material temperature rise high, resin solid 化.

         mixed material 程序如 lower:  

        首先 will abrasion material, usually is mixed combined degree, 进行予 mixed, again add wetting agent, uniform lubricating wet abrasion material rear, again will already and other powder filler mixed good powder resin add 入, mixed combined uniform. mixed good abrasion material need has relatively good can property and flow property, material material can wet, 否则容 easy block, more can has powder 团, meanwhile ensure has good flow property, ensure 注模充 separation, generally using/adopting 筛 办 method remove block.

        判断 material material can property good bad methods is:

        抓一 mixed good material material, use light light 一捏就会 formed is 佳. generally will powder material material add lubricating wet good abrasion material in easy formed powder 团, currently already by 淘汰, in use relatively more is di mixed material method, is will abrasion material and wetting agent in mixed material machine in mixed combined, meanwhile another mixed material machine in will powder resin and other powder filler mixed 匀, again will lubricating wet good abrasion material powder material in, mixed combined uniform can. di mixed material advantages is can generate powder 团, also can 避免污染, easy 于清洗 material 锅. will mixed good material material rear, can used for pressure made.

         pressure made 程序如 lower:  

         will mold good, amount requirements amount abrasion material mold 空腔, rear pressure made. need reinforcement glass fiber (GF) sheet/slice requirements 放入. rear in room temperature lower add pressure, generally cold pressure pressure scope/range is 15—30N/mm2, most good is 15—25 N/mm2. pressure large small selection 取决于 material material can property and requirements to density. use high pressure, 否则会 will abrasion material pressure 碎. pressure made time generally is 5—50秒, most good is 5—30秒, time long short 取决于砂轮 requirements to density and 形状以 and material material can property good bad. rear can will 砂轮取出进行 lower 一步 操 as —— solid 化.

         solid 化程序如 lower:  

         solid as can solid solid in 进行, can in flow 隧道式 solid in 进行. use solid solid 化, 砂轮 安放位置 especially important, generally will use or 陶瓷质 圆盘 solid 定, ensure in solid process in deformation, uniform 放置于炉 inner, inner need has gas ring make 各部位受 hot uniform, rear rise temperature 程序进行 solid 化; use 隧道式 solid solid 化, will use or 陶瓷质 圆盘 solid 定, again to small in, 推入隧道 inner, setting speed degree 运行. generally temperature is 60—80℃, temperature is 160—190℃, solid process use 时20—25 small 时, most rear drop temperature 至40—60℃, 打开炉门, can 取出砂轮.

         in add hot process in material and chemical 变化, temperature degree stage/phase main/primary below/following reaction: 80℃时 resin 开始熔 melt, has water 份蒸出, solid reaction 开始; 110℃时六次 separation understanding make melt resin crosslinked, meanwhile 释放出氨 gas, water and other gas 体; 110—180℃ resin crosslinked 直至完 full solid 化, a large amount of gas 释放. high temperature time long 会导致 resin solid 化, in hardness rise high meanwhile, 导致砂轮 strong/high degree decline, generally according to different requirements selection different solid 化曲线 and solid temperature. temperature is 165—170℃, hard tough property good;终 temperature is 175—180℃, hard;终 temperature is 185—190℃, hard 而脆.

        2． semi hot pressure process:

         semi hot pressure process pressure made temperature degree generally is 50—65℃, its process and cold pressure process full 一致. in this pressure made temperature degree lower liquid resin viscosity small, can very good will powder resin melt is 一体, make resin system flow property improve/increase, more easy separation 穿透各 空间, make pressure machine pressure high, can very good molding, holding pressure time need long, especially suitable for as 业 自动化 pressure made production 线.

        3． hot pressure process:

         hot pressure process generally used for manufacturing relatively large density 砂轮, 普通砂轮 density generally is 2.4—2.7g/cm3, most high 2.9g/ cm3, high density density can 达3.1—3.5g/ cm3, need to this high density, hot pressure process is most combined 适. hot pressure process mixed material requirements and cold pressure process different, generally using/adopting dry mixed method, or use small abrasion material weight 1% 糠 aldehyde wetting agent wet lubricating abrasion material, again and powder resin mixed combined uniform. powder resin generally selection flow degree small, combined scope/range is 15—20mm甚至 more small, can use liquid resin and flow degree large powder resin is is hot pressure easy 溢脂.

          pressure made:  

         pressure made temperature degree scope/range is 160—170℃, pressure made time is 30—60秒/ mm thick degree, pressure made 一 60mm thick 砂轮参考 below/following requirements: pressure: 20—40N/mm2; pressure made temperature degree: 150—170℃; pressure made time: 30—60 separation 钟. in pressure made process in, pressure rear 4—8 separation inner need gas one-time or 几次. solid 化: hot pressure rear already tool has versus strong/high degree, is need to most property can still need solid 化处理. solid temperature degree is 160—180℃, solid time 8—12 small 时.