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  • 擠塑板中的阻燃劑
  • 本站編輯:杭州光煒ag8官网是材料有限公司發布日期:2020-01-12 17:56 瀏覽次數:

   擠塑板阻燃劑的分解溫度是在實驗室條件下、等速升溫時測定的,所以數值的高低就是表示其穩定性能的好壞,並代表其在生產過程中的實際分解溫度。另外由於回料雜質對分解的影響以及停留的時間等因素的影響,因此選擇阻燃劑的分解溫度至少要高於設備的最高加工溫度20℃以上。

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六溴環十二烷阻燃劑是最有效的阻燃劑,但是普通型的六溴環十二烷很容易分解。根據國內外擠塑板生產廠家的經驗來看,擠塑板必須使用熱穩定型六溴環十二烷,阻燃劑的分解會放出強腐蝕性的溴化氫氣體,嚴重腐蝕設備,使擠塑板的阻燃性隨著溴化氫揮發而逐漸衰減,但分解溫度也不是越高越好,要和板材的燃點相匹配,一般國產設備使用阻燃劑分解溫度在240℃比較合適。

       母粒擠塑板阻燃劑是阻燃劑加上塑料載體、分散劑經過擠出機加熱製成顆粒,其中阻燃劑成分會占到40%-50%,母料的分散性好、使用衛生無粉塵,但是缺點是使用成本高,阻燃經過一次熱加工後不可避免的會有一定損耗,如果母粒中阻燃劑選用的是不耐溫的普通型六溴環十二烷,也同樣存在分解失效,腐蝕設備的問題。

粉狀阻燃劑使用時間最早,也是應用最為廣泛的,它的優點是經濟性好、阻燃效果好,缺點是與塑料顆粒比重不同,容易分層,粉狀阻燃劑在使用時要注意混合設備的選擇,避免出現沉降分層。另外阻燃劑一定要選擇穩定性好的阻燃劑,國內生產的六溴環十二烷必須要經過樹脂表麵包覆處理才可以直接使用。

The decomposition temperature of flame retardant for extruded board is measured under laboratory conditions and constant temperature rise, so the numerical value indicates the stability and actual decomposition temperature in the production process. In addition, due to the influence of impurities on decomposition and residence time, the decomposition temperature of the selected flame retardant should be at least 20 ℃ higher than the maximum processing temperature of the equipment.

Hexabromocyclododecane is the most effective flame retardant, but ordinary hexabromocyclododecane is easy to decompose. According to the experience of Extrusion board manufacturers at home and abroad, heat stable hexabromocyclododecane must be used for Extrusion board. The decomposition of flame retardant will release highly corrosive hydrogen bromide gas, which will severely corrode the equipment, so that the flame retardancy of Extrusion board will gradually decline with the volatilization of hydrogen bromide, but the decomposition temperature is not higher and better, which should match with the burning point of the board. Generally, domestic equipment is used The decomposition temperature of flame retardant is 240 ℃.

The flame retardant of masterbatch extruded board is made of flame retardant, plastic carrier and dispersant, which are heated by extruder. The composition of flame retardant will account for 40% - 50%. The masterbatch has good dispersibility and no dust. However, its disadvantage is high cost. After one-time hot processing, the flame retardant will inevitably lose a certain amount. If the flame retardant in masterbatch is ordinary type VI, which is not resistant to temperature Bromocyclododecane also has the problems of decomposition failure and equipment corrosion.

Powder flame retardant has the earliest use time and the most extensive application. Its advantages are good economy and flame retardant effect. Its disadvantages are different from the proportion of plastic particles and easy to layer. When using powder flame retardant, attention should be paid to the selection of mixing equipment to avoid settlement layer. In addition, the flame retardant with good stability must be selected, and the hexabromocyclododecane produced in China can only be used directly after resin surface coating treatment.