国产女人18毛片水真多,国模冰莲自慰肥美胞极品人体图,国产av无码专区亚洲精品,大地资源在线观看免费下载

 

1,4-Butanediol

Update time:2021/11/05 13:14:11  ???View:  
1,4-Butanediol (abbreviated as BDO) is an important organic and fine chemical raw material, it is widely used in the fields of medicine, chemical industry, textile, papermaking, automobile and daily chemical industry. BDO can produce tetrahydrofuran (THF), polybutylene terephthalate (PBT), gamma-butyrolactone (GBL) and polyurethane resin (PU Resin), coatings and plasticizers, etc., as well as solvents and electroplating Brighteners in the industry, etc.
 
Nature
Colorless viscous oily liquid. It is flammable, with a freezing point of 20.1°C and a refractive index of 1.4461. It is soluble in methanol, ethanol, acetone, and slightly soluble in ether. It is hygroscopic, has a bitter odor, and has a slightly sweet taste in the mouth.
 
Use
1,4 Butanediol is an important organic chemical and fine chemical raw material, and it is the basic raw material for the production of polybutylene terephthalate (PBT) engineering plastics and PBT fibers; PBT plastics are the five most promising ones. One of engineering plastics.
1,4-Butanediol is the main raw material for the production of tetrahydrofuran, which is an important organic solvent. Polytetramethylene glycol ether (PTMEG) obtained after polymerization is the basic raw material for the production of highly elastic spandex (Lycra fiber). Spandex is mainly used to produce high-elastic knitwear such as high-grade sportswear and swimming suits.
The downstream product of 1,4-butanediol, γ-butyrolactone, is the raw material for the production of 2-pyrrolidone and N-methylpyrrolidone products, from which a series of high value-added products such as vinylpyrrolidone and polyvinylpyrrolidone are derived. It is widely used in the fields of pesticides, medicine and cosmetics.
------分隔線----------------------------

Service Hotline:

You only need a phone call, we will serve you attentively

Consult now
Copyright © Shandong Zhengji Chemical Co., Ltd.  All Rights Reserved   Case Number :魯ICP備20007847號-4 chemBlink Premium Supplier
又大又粗又硬又爽又黄毛片| 在线观看无码av网站永久免费| 黑人巨大无码中文字幕无码| 麻豆国产va免费精品高清在线| 欧美亚洲日韩不卡在线在线观看| 精品无码久久久久国产手机版| 极品粉嫩国产18尤物在线观看| 又硬又粗进去好爽免费| 免费国产裸体美女视频全黄| 天堂资源中文最新版在线一区| 强伦姧人妻免费无码电影| 醉酒后少妇被疯狂内射视频| 亚洲最大成人网站| 久久久久久精品免费免费WER| 国产精品久久久久影院嫩草| 久久99精品久久只有精品| 国产真实乱子伦视频播放| 久久久精品日韩免费观看| 自拍亚洲一区欧美另类| 精品少妇人妻AV无码专区| 国产成人无码精品一区在线观看| 麻豆一区产品精品蜜桃的广告语| 无码av天堂一区二区三区| 国产无遮挡吃胸膜奶免费看| 福利免费观看体检区| 国产高跟黑色丝袜在线| 香蕉久久av一区二区三区| 亚洲色大成网站久久久| 色偷偷色噜噜狠狠网站久久| JLZZJLZZJLZ亚洲日本| 特级毛片在线大全免费播放| 精品国产一二三产品区别在哪| 精品乱人伦一区二区三区| 日韩激情电影一区二区在线| av中文无码乱人伦在线观看| 自拍亚洲一区欧美另类| 欧美日韩国产码高清| 日韩一线二线三线四线五线| 日韩AV无码成人无码免费| 成人A级毛片免费观看| 最新无码国产在线播放|