Shanghai Daoqin Plastics Co., Ltd.

polycarbonate (PC) (PC)／ terephthalic acid ester (PBT) alloy maintain crystallization material PBT chemical resistant product property good, easy processing molding features also combined non crystallization material PC notched impact strength high, dimensional stability good advantages, PC and PBT alloy blending essence upper is long short, tool has very high 商业潜 force, in automotive, home appliances and electronics electrical and other field/area to application. for/regarding heat resistant property and force property can requirements relatively high field/area, simple PC／PBT alloy very difficult meet/satisfy requirements, glass fiber (GF) due to its high strength, high modulus cost low 廉, by application in composite/compounding material field/area, utilizing GF reinforcement PC／PBT alloy, not only can improve/increase composite/compounding material heat resistant property and force property can, but also can improves composite/compounding material dimensional stability reduce production cost. currently for/regarding PC／PBT alloy research relatively more, for PC／PBT／GF ternary composite/compounding material relatively less, Shanghai day rise has company using/adopting GF reinforcement PC／PBT alloy, research separation content and increase agent for composite/compounding material property can effect/influence, is industrial application provide 参考.

1　 Sample made 备

首先 will PC and PBT raw materials 放置于100℃烘箱 in drying 6 h; rear according to formulation, in high speed mixed combined machine in mixed combined 30 min. will upper mixed combined uniform material in di screw extrusion machine upper melt extrusion, extrusion temperature degree separation 别设置 is 230, 230, 240, 240, 240, 240, 240, 240, 240, 230℃, material electrical machine frequency rate 12 Hz, screw speed is 400 r／min, extrusion rear pellets water cold, pellet cutting, rear will pellets in 100℃烘箱 in drying 6 h rear use injection molding machine injection molding formed strip/profile, injection molding temperature degree is 230～240℃.

2 不 year-on-year lower PC／PBT alloy property can

is research PC and PBT ratio/proportion for alloy force property can effect/influence, according to table/sheet 1 formulation, made as 出5 types Sample, research different PC content lower PC／PBT alloy tensile and notched impact strength.

2.1 PC／PBT alloy force property can

图1 is different PC content PC／PBT alloy tensile strength and notched impact strength. 由图1 can 知, PC content increase, alloy tensile strength and notched impact strength 都呈现出先 increase large rear decrease/reduce trend, 当PC content is 70份时, tensile strength is 71.6 MPa, notched impact strength is 10.21 kJ／m2, types force property can to most excellent value.

in PC content low alloy main/primary performance PBT property can, therefore alloy force property can versus for relatively 差, PC content increase, alloy in PC逐渐由 dispersion versus toward versus 转变, alloy performance 出PC property can, due to PC impact and tensile property can relatively high, therefore force property can increase, 当PC content ultra- 70份时 property can decline, is due to PC and PBT structure upper has ester 基, upper has versus property is has 限, but also in blending processing process in, a large amount of reaction property ester very easy ester reaction, make material from simple material blending formed copolymer, generate copolymer 也会抑 made versus 容, therefore PC and PBT is separation versus 容且存 in versus property most excellent ratio/proportion, 当PC content ultra- 70份时 versus property decline, therefore PC／PBT alloy force property can reduce.

2.2  PC／PBT alloy DSC analysis

图2 is year-on-year lower PC／PBT alloy DSC rise temperature 曲线. 图2反映 alloy melt is, from 图2 can 看出, pure PBT melt is 231℃, 当PC and PBT熔 melt rear, alloy material melt value toward low temperature 偏移, 当PC content from 10份 increase to 70份时, melt value 几乎不变, basic maintain in 208℃ left right, and PC content is 70份时, alloy 出现 不太 obvious cold crystallization 峰, PC content ultra- 70份时, alloy rise temperature in again obvious melt 峰.

图3示出 不 year-on-year lower PC／PBT alloy DSC drop temperature 曲线, pure PBT crystallization is 176℃, 当PC and PBT ratio/proportion is 1／9, 3／7, 5／5时 crystallization value separation is 174℃, 168℃ and 160℃. from 图3 can 看出, PC content increase, alloy crystallization 峰逐渐 reduce, 当PC content to 90份, in method obvious crystallization 峰.

3　PC／PBT／GF ternary composite/compounding material property can

through upper analysis, can 知道PC∶PBT=7∶3时, PC／PBT alloy material can maintain crystallization property polymer 特征, force property can also relatively is excellent, therefore selection in ratio/proportion lower research GF content for PC／PBT／GF ternary composite/compounding material property can effect/influence, is formulation combined property, more add combined reaction GF content for PC／PBT／GF材 material effect/influence, therefore in formulation in add 入2份 silicon coupling agent as is increase agent, its formulation table/sheet 2.

3.1 GF content for PC／PBT／GF ternary composite/compounding material force property can effect/influence

图4 is different GF content PC／PBT／GF composite/compounding material tensile and bending property can. from 图4 can 看出, has add GF时PC／PBT alloy flexural strength is 2500 MPa, GF content increase, PC／PBT／GF composite/compounding material bending elastic property modulus increase, 当GF content to 50份时 bending elastic property modulus to 8.5 GPa. GF content increase, PC／PBT／GF composite/compounding material tensile strength increase rear decrease/reduce most rear stability, in GF content is 20份时, tensile strength most high is 82 MPa.

图5 is different GF content PC／PBT／GF composite/compounding material notched impact strength. from 图5 can 看出, GF content increase, composite/compounding material notched impact strength decrease small rear increase large, in has add 入GF时, composite/compounding material notched impact strength is 10.21 kJ／m2, add 入10份 GF rear, PC／PBT／GF composite/compounding material notched impact strength speed decline to 3 kJ／m2, rear GF content increase notched impact strength increase, 当GF content is 50份时, notched impact strength to 11 kJ／m2.

3.2 different GF content lower PC／PBT／GF ternary composite/compounding material DSC drop temperature 曲线

当PC∶PBT=7∶3时, 图6 is different GF content PC／PBT／GF composite/compounding material DSC drop temperature 曲线. from 图6 can 看出, GF content increase PC／PBT／GF composite/compounding material DSC曲线 crystallization from obvious 逐渐出现 relatively is obvious crystallization 峰, 当GF content is 40份时 in 123℃ and 161℃出现 di crystallization 峰. due to PC抑 made material crystallization property can, make DSC drop temperature crystallization obvious, GF content increase crystallization 峰逐渐 obvious, 说明材 material crystallization property can has improve/increase, crystallization speed degree add fast. this is is GF in resin crystallization process in can nucleating agent function, promote versus formed 核且诱导 composite/compounding material crystallization, improve/increase crystallization speed degree. is PC for crystallization made function 依然存 in, therefore in GF content is 40份时, due to composite/compounding material crystallization property can 依然受 to separation made, therefore di crystallization 峰.

4　 increase agent for PC／PBT／GF ternary composite/compounding material property can effect/influence

PC／PBT／GF ternary composite/compounding material in, due to PC belongs to non crystallization polymer, PBT belongs to crystallization property polymer, GF belongs to machine non metal material, material interface adhesion defect, therefore need add increase agent improve/increase composite/compounding material combined force. Shanghai day rise has company using/adopting types di can ethylene type elastomer (AX8900 and PTW), silicon coupling agent (KH–550) as is increase agent, research it content for PC∶PBT=7∶3且GF content is 30份时 PC／PBT／GF ternary composite/compounding material property can effect/influence, formulation table/sheet 3.

4.1 increase agent for PC／PBT／GF ternary composite/compounding material bending property can effect/influence

图7 is different increase agent content PC／PBT／GF composite/compounding material bending elastic property modulus. from 图7 can 看出, 随 3 types increase agent content increase, bending elastic property modulus increase large rear decrease/reduce, in content is 1份时, PTW and AX8900 increase composite/compounding material bending elastic property modulus to most large value, separation is add increase agent 1.1倍 and 1.13倍, 当KH–550 content is 2份时PC／PBT／GF composite/compounding material bending elastic property modulus most high, is add increase agent 1.09倍, 当AX8900 and PTW content is 3份时, PC／PBT／GF composite/compounding material bending elastic property modulus 都出现 obvious decline, ratio add increase agent PC／PBT／GF composite/compounding material more low. versus ratio 而言, AX8900 can in more low content lower make PC／PBT／GF composite/compounding material bending elastic property modulus more good.

4.2 increase agent for PC／PBT／GF ternary composite/compounding material impact property can effect/influence  

图8 is different increase agent content PC／PBT／GF composite/compounding material notched impact strength. from 图8 can 看出, types increase agent can make PC／PBT／GF composite/compounding material notched impact strength has upper rise, its in PTW and AX8900 toughened obvious, PC／PBT／GF composite/compounding material notched impact strength and it strong/high degree 呈现出 positive related, in PTW and AX8900 content is 1份时, PC／PBT／GF composite/compounding material notched impact strength, separation is add increase agent 1.79倍 and 2.11倍, in PTW and AX8900 content is 3份时, separation is add increase agent 2.86倍 and 2.92倍. add 入KH–550 rear, PC／PBT／GF composite/compounding material notched impact strength has increase, content ultra- 2份 rear 逐渐趋于 stability, its content is 2份时 notched impact strength is add increase agent 1.14倍 left right.

5　结论

(1) PC for PBT crystallization in made 效果, content high retardant large, PC∶PBT=7∶3时PC／PBT alloy comprehensive force property can most excellent, tensile strength is 71.6 MPa, notched impact strength is 10.21 kJ／m2.

(2) PC／PBT／GF ternary composite/compounding material in, GF content increase, bending elastic property modulus increase, tensile strength increase rear decline again stability, notched impact strength decline rear upper rise. GF can to versus formed 核 效果, improve/increase ternary composite/compounding material crystallization speed degree content high 效果越 obvious.

(3)三 types increase agent in, KH–550 content is 2份时效果 most 佳, PTW and AX8900 in content is 1份时效果 most 佳, in content low 于1份时 main/primary to increase 容 效果, ultra- 1份时 toughened obvious, 会导致PC／PBT／GF ternary composite/compounding material rigid property decline, comprehensive comparison add increase agent AX8900 PC／PBT／GF ternary composite/compounding material toughened most good.

该 inner 容摘自:梁伟 formed, 阮静, 张浩.组 separation for PC／PBT／GF ternary composite/compounding material effect/influence [J]. engineering plastics application, 2020, 48(2): 108–113.