Shanghai Daoqin Plastics Co., Ltd.

polyethylene (PE) （PE） resin is ethylene mono polymerization formed polymer. polyethylene (PE) separation is long 链线形 structure or structure, is type crystallization polymerization material.

in solid 体状态 lower, crystallization separation and 无定形部 separation 共存. crystallization degree processing conditions and 原处理 conditions 而异, generally lower, density high crystallization degree 就越 large.

LDPE crystallization degree usually is 55%～65%, HDPE crystallization degree is 80%～90%. PE tool has excellent machine processing properties, its surface inert property and non property, formed printing property, color property, hydrophilic water property, bonding property, anti-static property can and and other property polymer and machine filler versus property relatively 差, but also its wear resistance, chemical resistant 药 product property, resistant ring force cracking property and heat resistant and other property can 不佳, made its application scope. through modified improve/increase its property can, expand large its application areas.

1.接技 modified

grafting polymer 几乎不改变取 ethylene skeleton/framework structure, meanwhile also will tool has various function property mono grafting to PE主链 upper, maintain PE原 has features, also increase new function, is types simple 而行之 has 效 PE极 property function methods.

grafting reaction methods main/primary has solvent liquid method, solvent melt method, solid versus method and grafting method and other.

（1） solvent liquid method

use 甲苯, 二甲苯, chlorine and other as is reaction in liquid versus in 进行. PE, mono 体, agent full solvent understanding in reaction in, system is versus, 介质 极 property and for mono 体 链转移常数 for grafting reaction effect/influence very large.

（2） solid versus method

will PE powder 末直接 and mono 体, agent, interface active property agent and other reaction. and 传统实施 methods versus ratio, solid versus method tool has reaction temperature degree 适宜, pressure, 基本 maintain polymer solid has material property, recycling solvent agent, rear simple, high energy saving and other advantages.

（3）熔 melt method

in melt lower, through agent hot separation understanding generate 自由基, from 而引发 large separation generate 自由基, in grafting mono 体 存 in lower 发生自由基 copolymer reaction, rear in polymer large separation upper grafting 侧链.

（4）辐射 grafting method

辐射 grafting surface modified 包括γ射线, β射线, electronics and other methods, its principle is utilizing polymer by rear generate 游离基, 游离基 again and its it mono formed grafting polymerization reaction, to surface modified 目. grafting modified method has: 共辐照 method, 预辐照 method, oxidation material method.

2. crosslinked modified

crosslinked modified make PE material force strong/high degree large large improve/increase, significantly improvement its resistant ring force cracking property, corrosion resistant property, resistant creep property and weather resistance, from wide its application scope. already product PEX（ aluminum composite/compounding tube/pipe ）就 is PE crosslinked typical applications. crosslinked modified has crosslinked, chemical crosslinked, silicon crosslinked.

辐射 crosslinked: will polyethylene (PE) 置于辐射场 in, in high can 射线（ main/primary is γ射线, X射线 and electronics and other ） function lower, can in solid polymer in 形 formed multiple active property pellets, 引发一 series chemical reaction, from can in polymer internal formed crosslinked 三维网络 structure.

chemical crosslinked: oxidation material or nitrogen combined material separation understanding formed 自由基 and PE separation in saturated and formed active property in 心, through mono this active property in 心连结起 就 formed is chemical crosslinked polyethylene (PE).

silicon crosslinked: make has saturated and ethylene and easy hydrolysis oxygen more can silicon grafting to PE主链 upper, rear in water and silicon alcohol shrink combined catalytic agent as use lower hydrolysis shrink combined formed —Si—O—Si— crosslinked 键, silicon crosslinked polyethylene (PE).

3. blending （ poly ） modified

（1） copolymer modified

polyethylene (PE) copolymer modified 包括配位 copolymer combined, 如乙丙橡胶（EPR）, ternary 乙丙橡胶（EPDM）以 and ethylene 同1-丁烯, 1-戊烯 copolymer material; polyethylene (PE) 自由基 copolymer combined, ethylene -醋 acid ethylene ester copolymer （EVA）; type copolymer combined, ethylene -（甲基） acrylic copolymer, ethylene - methacrylic acid ester （EGMA） copolymer and other. through copolymer reaction, can large separation 子链 柔顺 property or make 原 基团 belt/tape has reaction property can 团, can to reaction property increase agent function.

（2） blending modified

blending modified is use its it resin, or thermoplastic property elastomer and PE blending, improvement PE tough property, impact resistant property, printing property, for type retardant property and other property can.

① high low density PE blending modified. low density PE relatively soft/flexible, strong/high degree relatively low; high density PE strong/high degree large, tough property relatively 差, blending, can long short, made hardness versus PE材 material. HDPE/LDPE blending system in add 入LLDPE（线 property low density PE） or VLDPE（极 low density PE）, due to LLDPE or VLDPE and HDPE共晶, and LDPE部 separation 共晶, to improvement its property can 目.

②PE and CPE（ chlorine polyethylene (PE) ） blending modified. CPE and PE blending rear, blending material in chlorine 原子, can 改进PE flame retardant property. selection versus 容 agent, can improvement versus property, its it flame retardant methods can can formed products property can decline. another, PE and CPE blending also can improvement PE printing property, tough property.

③PE and EVA blending modified. PE and EVA（ ethylene -醋 acid ethylene ester ） blending material tool has excellent flexibility property, transparent property, relatively good gas property and printing property, 受 to heavy 视. meanwhile products force strong/high degree has decline.

④PE and blending modified. HDPE and type material 质（如丁基胶, 天然胶, 丁苯胶, 乙丙胶 and other ） blending, can significantly improve/increase its impact property can.

⑤PE and PA（ polyamide (PA) ） blending modified. will PA掺入PE can improve/increase PE for oxygen and type solvent agent retardant property. due to separation structure 差异, PA and PE versus property 差, and other through outer 线辐射, make PE separation upper 引入C＝O, —COOH—, —OH and other property 基团, in and PA熔 melt blending process in, 引入 property and PA separation upper amine or amine 基发生 chemical reaction, reinforcement HDPE and PA interface versus function.

4. filling modified

filling modified is in thermoplastic property resin in add machine pellets, make plastics products raw materials cost reduce to increase heavy 目, or make plastics products property can has obvious 改变. in certain property can meanwhile, make property can to obvious improve/increase. is discussion 方便, will filling modified separation is generally property filling and function property filling.

（1） generally property filling modified

generally property filling 仅限于PE force property can 变化. filling PE machine filler has carbon acid 钙, slip powder, high 岭土, acid 钡, silicon acid and oxidation silicon and other.

carbon acid filling PE composite/compounding material can reduce products cost, high rigidity, heat resistant property, dimensional stability. machine filler carbon acid and non property high poly material PE界面 bonding property 差, 导致材 material force property can, flow property can decline. through add coupling agent or use MPEW（ maleic anhydride grafted polyethylene (PE) poly material ） for carbon acid 钙进行包覆处理 can improvement interface bonding property. filling PE commonly used has machine filler has fiber, powder fiber and other.

（2） function property filling modified

filling modified main/primary is improvement plastics in light, electrical, magnetic, and other 方面 效果, not only is force property can 变化, this category of filling modified is function property filling. function property filling polyethylene (PE) 包括生 material degradation polyethylene (PE), conductive polyethylene (PE) and flame retardant polyethylene (PE) and other.

生 material degradation polyethylene (PE): will powder property rear add 入PE in can made powder plastics, 埋入土壤 rear due to powder in, tool has micro material biodegradable property. research table/sheet 明, PE/淀 powder degradation plastics can as is carbon by micro material utilizing, can is micro material 次代谢 material 腐蚀.

conductive polyethylene (PE): insulation polyethylene (PE) resin and conductive filler （如炭黑, metal powder ） composite/compounding can conductive property new type function material. this category of material tool has important 理论 research value, but also in anti-static, conductive, control hot 体, EMI shielding and other more field/area has is application outlook/prospects.

flame retardant polyethylene (PE): PE flame retardant methods has: ①添 add flame retardant, and oxidation 二锑配 combined use. ②添 add has machine acid, acid 铵, bromine and other. ③添 add has flame retardant function machine filler, 如Al(OH)3,Mg(OH)2 and other.

5. reinforcement modified

tool has reinforcement filling modified is reinforcement modified, selection reinforcement material has glass fiber, combined formed fiber, must and other. is discussion 方便, will reinforcement modified 也并入此 type. 自 reinforcement modified. this type of reinforcement modified add 入任何 filling material, is through molding processing methods and mold runner design, make PE熔 melt 体 flow speed degree degree increase large, formed separation 子链 平行 orientation, has 助于伸直链晶体 生 formed, from separation 挖掘材 material inner in force, development force property can and engineering plastics polyethylene (PE) products. due to add filling material, 不需考虑 polyethylene (PE) and filling material versus property issues. glass fiber reinforcement polyethylene (PE) modified. utilizing easy tool has high strength glass fiber reinforcement PE, improve/increase its force strong/high degree and heat resistant property, make its formed is 工程 plastics. research table/sheet 明, in composite/compounding process in add interface reaction agent and its and PE grafting formed grafting material can and glass fiber surface and its silicon 烷发生化学 function or crosslinked, significantly improve/increase composite/compounding material interface adhesion property can and force property can. combined formed fiber can as is reinforcement type filler, it ratio glass fiber density small, strong/high degree more high. can used for PE modified combined formed fiber has polypropylene (PP) fiber, poly 酰 amine fiber, polyethylene (PE) alcohol fiber, aromatic polyamide (PA) fiber and other. 晶 must as is types new type material, tool has strong/high degree high, modulus high, thermal properties good and other advantages, meanwhile and versus property relatively good, therefore can as reinforcement agent make use. commonly used has carbon acid must, titanium acid must and other.

6. nano pellets for PE modified

nano material average particle size in 100nm below/following, pellets dimensions 处于原子簇 and macro material 体交接区域 inner material. due to surface 效应, 体积效应 and other, nano pellets tool has many new material chemical property 质, polymer is polymer /无 machine nano pellets composite/compounding material tool has good machine 械, light, electrical, magnetic and other features, can formed important more function new material, nano technology for polymer modified already formed is material research front 沿. nano modified PE材 material in has: nano 蒙脱土 modified PE, nano oxidation zinc modified PE, nano oxidation aluminum modified PE and nano modified PE and other.