黑巨茎大战乌克兰美女

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聚苯乙烯泡沫板是如何生產的?

分類:公司新聞 發布時間:2020-07-24 199次瀏覽

工藝流程及配方:1.工藝流程可以分為預發泡、熟化和模壓成型三個階段,其中以預發泡...

工藝流程及配方:

1.工藝流程可以分為預發泡、熟化和模壓成型三個階段,其中以預發泡和模壓成型為主。

2.發泡原理

在常溫下,通過強溶劑的溶解和膨脹作用使聚苯粒料變軟,為其內部發泡劑的發泡膨脹、控制壓力創造條件,使原料在發泡容器內保持粘度較大的液體或塑性狀態。打開閥門,因為外界壓力遠遠低于容器內部壓力,聚苯粒料在壓力作用下噴出的同時,其內所含發泡劑如丁烷、戊烷、石油醚等氣化產生壓力使已軟掉的粒料膨脹形成泡孔而發泡成型。適當的壓力是可發性聚苯顆??焖侔l泡的關鍵,壓力來源是MF-1型發泡劑內充有部分壓縮空氣,并有低沸點、高蒸氣壓的丁烷,從而能產生并保持較為平衡的壓力。

3.原材料配方及預加工

(1)原材料的處理原材料可分為普通型粒料和含有阻燃劑的聚苯粒料。根據需要可進行干燥、粉碎、過篩、過濾和研磨等。

(3)預加工  按配方稱取原料并混合,混合后的物料可以根據需要預加工成含發泡劑的粉狀、糊狀、粒狀、片狀或各種形狀的料坯,稱為可發性聚苯。將可發性聚苯直接放人壓模發泡成型稱為一步法,目前建筑和包裝行業廣泛采用的就是一步法高發泡成型。將可發性聚苯進一步預發泡制成預發泡粒料或料坯,然后再放人模具模壓發泡成型,稱為二步法。

泡沫板的優勢:

1、對建筑物主體結構進行保護,延長建筑物壽命。由于外保溫是將保溫層置于結構外側,降低了由于溫度變化導致的結構變形產生的應力,并減少空氣中有害物質和紫外線對結構的侵蝕。

2、去除“熱橋”以往采用內保溫,“熱橋”是難以避免的,而外墻保溫防止熱橋的產生,避免結露。

3、使墻體潮溫情況得到改變,一般內保溫需設隔汽層,而采用外保溫保溫材料的透溫性能遠遠強于主體結構,在墻體內部一般不會發生冷凝現象,結構層的整個墻身溫度提高了進一步增強了墻體的保溫性能。

4、有利于室溫保持穩定,采用外墻外保溫,由于墻體蓄熱較大的結構層在墻體內側,有利于室溫抲持穩定。

5、增加房屋使用面積??梢员苊舛窝b修對保溫層的破壞。


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黑巨茎大战乌克兰美女
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