Silicone antifoaming agent

• Main Author: ZENG JIANREN
• Format: Patent
• Language: Chinese; English
• Published: 20.10.2004
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING

本发明的硅氧烷防沫剂对于含水发泡体系展示了优异的防沫效果，和特别适用于与油墨结合，其中它显著抑制在油墨使用期间陷穴的发展。硅氧烷防沫剂的特征为包括聚氧化烯改性的硅氧烷，该聚氧化烯改性的硅氧烷含有由通式(1)和(2)表示的聚氧化烯基团和在一个分子中包含10-200个二有机硅氧烷单元，该聚氧化烯改性的硅氧烷满足如下条件：3≤E≤90和0.01≤E/(E+P)≤0.45，其中P是包含在一个分子中氧化丙烯单元(C#-[3]H#-[6]O-)的总数目和E是包含在一个分子中氧化乙烯单元(C#-[2]H#-[4]O-)的总数目。 Silicone antifoaming agent of the present invention demonstrates excellent antifoaming effect with regard to aqueous foaming systems, and is especially suitable for use in conjunction with inks where it significantly suppresses development of cissing during use of ink. The silicone antifoaming agent is characterized by comprising a polyoxyalkylene-modified silicone that has polyoxyalkylene groups expressed by general formula (1) and (2) given below and contains 10 to 200 diorganosiloxane units in one molecule, said polyoxyalkylene-modified silicone satisfying the following conditions: 3<=E<=90 and 0.01<=E/(E+P)<=0.45, wherein P is the total number of oxypropylene units (-C3H6O-) and E is the total number of oxyethylene units (-C2H4O-) contained in one molecule.