PBT muaj qhov taw qhia tshwj xeeb thiab lub pob khaus ntawm 225-235 ° C. Nws yog khoom siv crystalline nrog ceev crystallinity ntawm 40%. Lub viscosity ntawm PBT yaj tsis ntau npaum li cuam tshuam los ntawm qhov kub raws li qhov kev nyuab siab. Yog li ntawd, nyob rau hauv kev txhaj tshuaj molding, qhov kev txhaj tshuaj muaj qhov muaj txiaj ntsim zoo rau ntawm kev nchuav ntawm PBT. PBT muaj lub zoo fluidity thiab low viscosity nyob rau hauv lub xeev molten, thiab tsuas yog lub ncuav polyamide thib ob yog nws "casting" thaum lub sij hawm molding.
PBT zoo li cov khoom yog anisotropic. PBT yooj yim degraded thaum raug dej rau kub kub. Thaum xaiv ib lub hau ntswj hom tshuaj molding tshuab, cov ntsiab lus hauv qab no yuav tsum raug xam tias yog. 1 Tus nqi ntawm cov khoom siv rau cov khoom yuav tsum raug tswj ntawm 30% -80% ntawm cov tshuaj txhaj tshuaj txhaj tshuaj ntawm cov tshuaj molding tshuab. Nws tsis yog yuav tsum tau siv cov tshuaj molding me me los ua cov khoom me me. Thaum siv lub tshuab fais fab loj, ib lub tsho me me heev yuav ua rau qhov chaw nyob yuav ua kom tsis tas siv sij hawm, ua rau muaj degradation resin;
2 Cov kab hom theem peb sab theem siab, xaiv qhov piv txwv yog 15-20, thiab qhov sib piv ntawm qhov sib piv yog 2.5-3.0;
3 yuav tsum siv tus kheej lub qhov ntsuas xo nrog cua kub thiab ntsuas kub;
4 Thaum muaj molding nplaim hluav taws qab PBT, qhov chaw ntawm qhov txhaj tshuaj molding tshuab yuav tsum tau kho nrog kev kho corrosion.
Cov khoom tsim thiab puab tsim yuav tsum xav txog cov nram qab no:
1 Lub thickness ntawm cov khoom yuav tsum tsis txhob yog tuab heev, thiab PBT yog heev nkag siab ntawm qhov sib txawv. Yog li no, txoj kev hloov ntawm txoj cai ntawm qhov khoom yuav tsum tau txuas nrog lub vas arc;
2 Lub PBT unmodified muaj ntau qhov qis zog, feem ntau ntawm 1.7% thiab 2.3%, yog li cov pwm yuav tsum muaj qee cov kev tsim qauv; 3 moulds yuav tsum tau muaj cov qhov tso pa lossis cov pa hauv qhov av;
4 qhov loj ntawm lub qhov rooj yuav tsum loj;
5 puav yuav tsum tau nruab nrog ntsuas kub twj, pwm kub kub tsis tshaj 100 ° C;
6 nplaim hluav taws PBT molding, nplaum ntawm cov pwm yuav tsum chrome plated los tiv thaiv kev kub ntxhov.
