Nzira shanu dzePolymer Shrinkage Modification, Mangani Aunoziva?

Kana polymer ikadonha zvishoma, ndipo panobva pawedzera kururama kwechigadzirwa. Pazasi pane tsananguro pfupi yenzira dzakasiyana siyana dzekugadzirisa dzinoderedza kuputika kwemapolymer zvinobudirira.

1. Mhando dzese dzefaibha dzinozadzwa uye dzinogadziriswa

Mafaibha anotaurwa pano anosanganisira marudzi ese efaibha dzisina kugadzirwa nedzemhando yepamusoro. Semuenzaniso, kuwedzera faibha yegirazi muPP resin kunogona kuderedza kusimba kwayo.

Mapolymer akasimba egirazi refu ane mukana wekudzikira kwakaderera uye kudzikira kwakasimba mumativi ese ari maviri erefu uye akachinjika zvichienzaniswa nemafiber egirazi mapfupi. Mapolymer akasimba ewhisker ane kudzikira kwakaderera pane mapolymer akasimba egirazi, semuenzaniso kuenzanisa kudzikira kwegirazi fiber necalcium sulphate whisker yakasimbiswa.Zvinhu zvePP neABSinoratidzwa sezviri pazasi.

2. Kugadziriswa kwekuzadza zvinhu zvisina kugadzirwa (inorganic filler filler)

Zvinhu zvinozadza zvisina organic zvinosanganisira talc, calcium carbonate, barium sulphate, mica powder, wollastonite nemontmorillonite, nezvimwewo. Zvinhu zvakasiyana zvinozadza zvine mhedzisiro yakasiyana padanho rekudonha kwebvudzi.

(1) Chimiro chemuzadzisi
Maumbirwo akasiyana ezvizadza zvisina kugadzirwa ane mhedzisiro yakasiyana padanho rekupwanyika, mhedzisiro chaiyo pahukuru hwemaflakes > tsono > granules > spheres

(2) Hukuru hwechinhu chinozadza
Saizi dzakasiyana dzezvimedu zvekuzadza zvakafanana dzine mhedzisiro yakasiyana padanho rekupwanya, saizi yezvimedu idiki, ndiko kuderera kukuru kwedanho rekupwanya. Tora talc filled PP (20% talc + 8% POE) semuenzaniso, mhedzisiro yehukuru hwakasiyana hwezvimedu zvetalc padanho rekupwanya ndeiyi inotevera.

(3) Kugadziriswa kwechinhu chinozadza pamusoro
Chinozadza chimwe chete, chingave chakagadziriswa pamusoro kana chakaiswa resin, chine mhedzisiro yakasiyana padanho rekupwanyika. Kugadziriswa kweganda pamusoro pechinozadza kunobatsira zvikuru padanho rekupwanyika.
(4) Huwandu hwekuzadza
Huwandu hwechinozadza chimwe chete hunowedzerwa zvakasiyana nechiyero chekudzikira, huwandu hwakawedzerwa hwakawanda ndiko kudzikira kukuru kweuto rekudzikira.

3. Kuderedza kugadziriswa kwekristaro
(1) Wedzera kuti uderedze kuwedzera kwekristaro
Kazhinji inoshandiswa kuderedza kuwedzerwa kwekristaro kwemamorekuru madiki, inowedzerwa kumamiriro akanyungudutswa kana kugara kwemamorekuru makuru kuchiputsika, zvichitadzisa kufamba kwemamorekuru makuru, kuitira kuti chinangwa chekristaro chideredzwe.

(2) Wedzera mimwe misanganiswa ye resin
Zvakadai sehuwandu hushoma hweLDPE, HDPE resin yakasanganiswa muPP, inogona kukuvadza zvakanyanya hunhu hwekristaro hwePP pakugadzirisa, kuwedzera PE resin muPP, semuenzaniso, kukanganisa kwehuwandu hwakasiyana hwePE pahuwandu hwePP shrinkage kunoratidzwa mutafura iri pazasi. Pamusoro pezvo zvinokwanisikawo kuwedzera non-crystalline resins dzakadai sePS, ABS, PMMA uye PC kuPP, izvo zvinogonawo kuita basa mukuderedza crystallization.

Mhedzisiro yekuwedzera mamwe maresini pakudonha kwesimbi haina kunyanya kukosha pane migumisiro yefibres ne inorganic fillers, uye kazhinji PP yakasimbiswa negirazi chete ndiyo inogona kukanganisa kudonha kwesimbi ne50%.

4. Kugadziriswa kwe elastomer yakasanganiswa
Inogona kusanganiswa ma elastomer anosanganisira POE, EPDM, SBS, nezvimwewo, marudzi ese e elastomer pa shrinkage rate yepurasitiki iri pedyo zvikuru nekukanganiswa.

Kana huwandu hwe elastomer huri pasi pe5%, mhedzisiro yemhando yega yega ye elastomer pakudonha kwePP inenge yakafanana. Kana huwandu hwe elastomer hwapfuura 5% chete, huwandu hwesimba remarudzi akasiyana e elastomer hunosiyana, uye kurongeka kwesimba pahuwandu hwekudonha iPOE>EPDM>SBS, izvo zvinoenderana nemhedzisiro ye elastomers paPP.

Kushandiswa kwezviputiriso zvisina kugadzirwa muPP zvakasanganiswa ne elastomers kunoita kuti shrinkage iderere zviri nani.

5. Kugadziriswa kwemakemikari ekubatanidza nekusanganisa
Ngatitorei PP resin semuenzaniso, kugadziriswa kwegraft kunogona kuderedza crystallinity yeresin, kuitira kuti chinangwa chekuderedza shrinkage chisvike. Ngatitorei PE cross-linking semuenzaniso, cross-linking inogona kuderedza zvakanyanya coefficient yekuwedzera kwemutsara weresin, nokudaro ichizadzisa chinangwa chekuderedza shrinkage rate.