摘要
以端羟基聚二甲基硅氧烷(PDMS)和氨烃基硅烷偶联剂(DB—912)为原料,合成了端氨烃基聚二甲基硅氧烷低聚物(NS),并以此作为扩链剂,制备了水分散有机硅-聚氨酯嵌段共聚物(WPSUR)。考察了NS的摩尔质量与扩链剂类型对乳胶粒粒径、薄膜疏水性与耐热稳定性的影响。结果发现,随着NS摩尔质量的增加,乳液粒径增大;扩链剂类型对乳液及薄膜性能影响较大,采用NS为扩链剂制备的WPSUR,乳液呈现较高的表观黏度,薄膜吸水率较低、对水的表面接触角达103°,疏水性较好;与引入小分子硅烷偶联剂的体系相比,体系中有机硅链段含量大大增加,耐热稳定性良好;水分散液均呈现良好的离心稳定性,乳液具有良好的耐高温性能与冰冻—解冻稳定性。
Firstly, amino -terminated polydimethylsiloxane （NS） was synthesized with hydroxy -terminated polydimethylsiloxane （PDMS） and ammonia alkyl - silane coupling agent （ DB - 912） as raw materials ; secondly, it was used as chain extender for the preparation of waterborne polysiloxaneurethane copolymer （WPSUR）. Effect of NS molecular weight and chain extender type on the particle size and storage stability of WPSUR dispersion were studied, as well as the effect of these factors on the water resistance, water contact angle, heat degradation and stability of WPSUR films. Results revealed that the particle size of dispersions increased as the molecular weight of NS increased. The type of chain - extender was more influential on the properties of the emulsion and the film. WPSUR films exhibited better water resistance and thermal degradation and stability properties then PU films using hexamethylene diamine （HDA） and 3 - （2 - aminoethylamino） propyl dimethoxymethyl silane （APDMS） as the chain extenders： the surface contact angle to water was up to 103 °, showing good water resistance. Comparing with films with small molecule silane coupling agents, the content of silicone chain increased significantly, showing good heat stability and good centrifugal dispersion stability. The emulsion had good high temperature resistance and freeze -thaw stability.
出处
《有机硅材料》
CAS
2009年第6期357-362,共6页
Silicone Material
关键词
有机硅
聚氨酯
水分散
疏抽l生
siloxane, polyurethane, copolymer, waterborne, water resistance
