| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 102 === The most commonly synthesized method of alkylsilane modified acrylate latex is copolymerization of (meth)acrylate and silane which had (meth)acryloyl group and alkoxy group. These silanes which had alkoxy group can improve the hydrophobicity of latex film; however, alkoxy group of silane will prodice polysiloxane by hydrolysis and condensation reaction, leading to the lower stability of polymerization and the increasing amount of agglomerate. Therefore, adding this kind of silane is usually less than 30% of total monomers. In this study, (3-methacryloyloxypropyl)tris(trimethylsiloxy)silane that had no alkoxy group is used to copolymerize silicone-acrylic latex with (meth)acrylate. The aim of this study is expected to improve stability of polymerization and to reduce the amount of agglomerate.
This experiment is divided into three parts. The first part was to determine the optimal ratio of the hard monomer to the soft monomer(MMA/2-EHA) and the optimal dosage of polyurethane crosslinkers. The results showed that the optimal ratio of MMA/2-EHA is 50/50, and the film had the maximum load and elongation, when the portion of polyurethane crosslinkers is 1%. The second part discussed on the affect of the amount of agglomerate, contact angle, and the water absorption of the latex film with different percentages of TTMSSPS. In the other hand, when the quanity of TTMSSPS was 50%, the amount of agglomerate was less then 10%; moreover, the contact angle upgraded to 90.9∘, and absorped water reduced to 9.64%. Eventually, increasing content of TTMSSPS result in decreasing the water absorption of film, and increasing the hydrophobicity of film. The third part showed the performance of the latex. All latexs can pass the stable test for the calcium ion, the strong acid, and the storage.
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