欧美激情综合一区二区三区,亚洲欧美一区二区精华液,久久久毛片免费全部播放,久久66久这里精品99

Phenolic resin

  • Product name : Phenolic resin
  • Product Categories : Phenolic resin
  • Company name : Zibo Shuanghe chemical industry technology co., ltd
Details


Phenolic resin, also known as Bakelite, is originally a colorless or yellow-brown transparent substance. It is often sold in the market with colorants added to make it appear in red, yellow, black, green, brown, blue and other colors, in the form of granules or powder.Resistant to weak acids and weak alkali, will decompose when exposed to strong acid and corrode when exposed to strong alkali.Insoluble in water, soluble in acetone, alcohol and other organic solvents. It is obtained by the condensation polymerization of phenol formaldehyde or its derivatives.

Solid phenolic resin is a yellow, transparent, amorphous lumpy substance, which is reddish due to the presence of free phenol. The specific gravity of the solid is about 1.7 on average. It is easily soluble in alcohol, insoluble in water, and is stable to water, weak acid, and weak alkali solutions.Resin made from the polycondensation of phenol and formaldehyde under catalyst conditions, neutralization and water washing. Depending on the choice of catalyst, it can be divided into two categories: thermosetting and thermoplastic.Phenolic resin has good acid resistance, mechanical properties, and heat resistance, and is widely used in anti-corrosion engineering, adhesives, flame retardant materials, grinding wheel manufacturing and other industries.



Update time :21/07/06 16:14:07   【print 】   【close【return to previous page 】
Contact Us
Contact: Mr.Li +86138-0533-7575
Contact: Mr.Sun +86135-6162-3306
Address: No.628, 6th Floor Tongqian Davis Business Center, Lutai Road, High-tech District, Zibo City, Shandong Province, China
美国男人操曰本女人的逼| 2021年国产精品无码| 骚女人乱操视频| 亚洲人成无码网站久久99热国产| 她的小穴被我操湿了视频| 鸡巴操黒逼白虎| 中文字幕乱码中文乱码| 日本一道一区二区免费看| 美女自慰网站色| 黑人与人妻无码中字视频| 乱淫鸡视频大全| 爱操比在线电影| 日本不卡一区二区三区黄| 国产一区二区三区四区区| 91一区二区国产的精液| 操骚逼美女视频| 杨门十二寡妇肉床艳史电影| 国产伦精品一区二区三区卡| 青青网成人免费在线视频| 欧美成年黄网站色视频| 日韩特级黄色大片在线观看| 日韩亚洲综合一区二区三区 | 能看女生巨乳的软件免费| 激情文学一区二区国产区| 扒开她的乳罩狂摸她的胸亲吻| 男人跟女人操黄片儿操逼| 国产一级a一级色免费视频| 亚洲国产一区一区毛片a| 欧美日韩亚洲精品吊丝网| 黄色网站免费在线看入口| 97人人模人人揉人人捏| 无码少妇精品一区二区免费动态| 亚洲精品成人a| 黄色日女人逼逼| 日b草B草BB| a片试看120分钟做受图片| 大鸡巴日进小嫩逼里图片| 久久综合一区| 永久免费40分钟看大片| 肏屄真舒服视频| 大鸡巴用力操我动漫视频|