CHINESE
ENGLISH
0559-3517287
Welcome to the official website of Huangshan Zhongze New Material Co., Ltd.
Home Page
About Us
About Us
We Devote to The Polyurethane Resin Product R&D, Sales And Service, With A Comprehensive Production Capacity of 10000 Tons.
Company Profile
Qualification Certificate
Company Environment
News Center
News Center
Here You Can Get The Latest Company News,Industry Dynamics And Media Coverage of Zhongze Comany,Let You Have The First-Hand Information.
Company News
Industry Dynamics
Media Coverage
Product Center
Product Center
Aiming For Higher Quality, We Select Imported Raw Materials That Are of Outstanding Quality And Practise Strictly in Production And Quality Control.
Product Introduction
Series of Ink Polyurethane
Resin Specifications
Contact Us
Contact Us
With Determination to Be Pioneering And Innovative,The Staff Adhere to Its Enterprise Spirit "Loyalty,Dedication, Unity and Innovation" And Carry The Company Forward Constantly
Map Navigation
Contact Information
Your current position:
homepage
>
News Center
>
Industry News
聚氨酯硬泡现场发泡技术应用常见的缺陷及解决方法
Time : 2018-11-22
1、 泡沫脱落
在冬天或者雨天,由于被喷涂表面(车身骨架及外蒙皮内表面等)温度过低,或者空气中湿度过大致使工件表面有水分,使形成的泡沫底层与工件附着力下降,容易整快脱落。另外,当被涂表面、骨架有油污、灰尘,或者配料比例失调(A料过多),也会使泡沫层附着力降低。解决措施是:在喷涂发泡前,做好骨架、蒙皮的表面处理,在湿度大的雨天施工,要想办法弄干喷涂工件表面的湿气;在冬季施工要加热原料,如有可能亦要给被涂表面、骨架进行预热;必要时提高B组份的比例(或降低A组份的比例),使其反应加快,提高粘接性。
2、泡沫收缩
泡沫收缩是指泡沫体成形后出现泡沫体四周收缩,使其与车身骨架间有较大间隙,影响粘接强度与密封,并容易脱落的现象。其原因是由于冬天施工时,物料的粘度增大,流动性变差,泡沫在成形过程中产生体积收缩所致。解决方法是给原料、空气加热,并适当提高空气流量(速),使物料混合均匀,加快反应速度。
3、 死泡
死泡是指所形成的泡沫密度太大,或者不发泡。这是因为原料中发泡剂不足,或者气温过低所致。解决方法是在冬季施工时,要给原料加热,加大风量,调节配方,增加催化剂、发泡剂量,以缩短反应时间。如果是在正常温度下施工出现死泡,则可能是因为A料存放时间过长,发泡剂已挥发掉的原因,这时要给 A料中加入部分发泡剂。
4、 泡沫太脆
这主要是因为原料配比不当,B组份用料过多所致。解决方法是适当调低B料流量,以减少异氰酸酯的用量。
5、 泡沫太软
与泡沫太脆相反,这主要是B组份用料配比低有关,适当增加B组份用量(或者减少 A组份的用料)即可。
Last article:
聚氨酯--聚氨酯油墨粘合剂及其案例
Next article:
人人都在谈环保,这些绿色印刷知识你还不了解?
News Center
Company News
Industry News
Media Coverage
Tel:0559-3517287
Fax:0559-3517261
E-mail: sales@zhongzechina.cn
Address:15 Changsheng Road, Circular Economy Garden, Huizhou District
Huangshan Zhongze New Material Co., Ltd.
URL:www.zhongzechina.cn