天气预报15天查询> 生活> 橡皮擦放久了为什么会变硬

橡皮擦放久了为什么会变硬

更新时间: 2021-02-26 00:02:04     

1、橡皮擦的主要成分是聚氯乙烯,聚氯乙烯对光、热的稳定性较差。软化点为80摄氏度,于130摄氏度开始分解。

2、在不加热稳定剂的情况下,聚氯乙烯100摄氏度时即开始分解,130摄氏度以上分解更快。受热分解出放出氯化氢气体,阳光中的紫外线和氧会使聚氯乙烯发生光氧化分解,因而使聚氯乙烯的柔性下降,最后发脆。

关键词: 橡皮 为什么

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-923777/ | 耗时:0.2315 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=923777 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=923777 LIMIT 0,1
select * from tbl_Articles_sphinx where id=923777 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1133077,1082221,1105133,1122168,1107725,1127453,1131871,1108083,1129323,1126334,1056594,1126232,1118100,1131379,1111830,1124045,1121994,1127021,1107184,1041853,1123597,1128399,1125045,1276114,599703,1113974,1131777,1125110,1109186,1077328) ORDER BY field (ArticleID,1133077,1082221,1105133,1122168,1107725,1127453,1131871,1108083,1129323,1126334,1056594,1126232,1118100,1131379,1111830,1124045,1121994,1127021,1107184,1041853,1123597,1128399,1125045,1276114,599703,1113974,1131777,1125110,1109186,1077328)