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    泰州科德橡膠機械-密煉機廠家:橡膠增塑原理概述

    發布時間:2019-08-23 10:49:00 點擊:    關鍵詞:密煉機,捏煉機,開煉機,橡膠機械

    一.橡膠增塑的方法

    泰州科德橡膠機械-密煉機開煉機捏煉機廠家2019年8月23日訊  1. 物理增塑法:加入物理 增塑劑

    2. 化學增塑法:化學塑解劑

    3. 機械增塑法:通過機械剪切作用,提高可塑性。

    二、作用機理

    1. 軟化劑(對非極性橡膠)的作用

    增塑劑的加入會降低橡膠的玻璃化溫度 Tg , Tg 下降值與增塑劑的體積分數有直接關系:

    ΔTg=kφ1

    k- 常數 ;φ1— 增塑劑的體積分數

    2. 增塑劑(對極性橡膠)的作用

    ΔTg=kn

    k—與增塑劑性質有關的常數;

    n—增塑劑的摩爾數。

    三、判斷互溶性的基本原則

    1. 溶解度參數相近相溶

    溶解度參數δ(簡稱 S.P. )是表示物質互溶能力的參數,可表示物質極性的大小。

      吉布斯自由能 ΔG=ΔH-TΔS

    若 ΔG<0 ,溶解能自發進行,相容性好。

    溶解焓變:

    密煉機,開煉機,捏煉機,橡膠機械

    υ1、υ2—橡膠、增塑劑的體積分數

    δ1、δ2—橡膠、增塑劑的溶解度參數

    一般來說:(δ1-δ2)→0 時,互溶性最好;(δ1-δ2)<1.2 時,能互溶

    2. 相似相溶或同類相溶

    即結構相似的物質能夠相溶。這即是“同類相溶”原理

    3. 溶劑化效應

    (1)概念:

    由于軟化劑和增塑劑分子與橡膠分子之間產生分子間吸引力, 而引起橡膠分子鏈分離的作用。

    (2)兩種物質間產生溶劑化的條件

    ①兩者之間能形成氫鍵

    ②兩者之間能產生親電親核作用

    密煉機,開煉機,捏煉機,橡膠機械

    三、溶劑型與非溶劑型軟化增塑劑

    1. 溶劑型軟化劑、增塑劑(能與橡膠產生溶劑化作用) 如芳烴油、松焦油古馬隆、酯類等;

    2. 非溶劑型軟化劑、增塑劑 如鏈烷油、石蠟凡士林、油膏、機油等.

    增塑劑的選擇

    一、與橡膠的互溶性

    互溶性是衡量增塑劑對橡膠增塑能力的標志。

    二、對膠料加工性能的影響

    1. 對填料分散的影響

    一般來說, 與橡膠互溶性好的軟化、 增塑劑對橡膠的增塑作用大, 易使填料分散均勻。

    2. 對膠料粘著性的影響

    一般來說,與橡膠互溶性好的軟化增塑劑,其加工性能好,粘著性也好。

    3. 對于壓延、擠出工藝

    應選與橡膠互溶性較小,增塑效果適中,增粘作用小的軟化增塑劑。

    三、對硫化膠物機性能和老化性能的影響

    四、對橡膠的污染性

    五、對制品成本的影響


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