Preparation and performance of waterborne styrene⁃acrylic emulsion modified with mercaptan silicone

doi:10.19491/j.issn.1001-9278.2022.01.001

Abstract

Abstract:

In this article， mercaptan silicone （PMMS） was firstly synthesized with hydroxyl?group?containing silicone oil and 3?mercaptopropylmethyldimethoxysilane as monomers. Then， a series of mercaptan?silicone?modified styrene?acrylic waterborne composite emulsions were prepared via seed emulsion polymerization with PMMS as a modifier and butyl acrylate， methyl methacrylate， styrene， and acrylic acid as monomers. Infrared spectroscopy， nuclear magnetic， and gel permeation chromatography were performed to characterize the structure and molecular weight of PMMS. The waterborne emulsion stability， water resistance， thermal stability， and mechanical properties of the samples loaded with various amounts of PMMS were further investigated using dynamic light scattering， thermogravimetric analysis and scanning electron microscopy， etc. These results demonstrated that the modified emulsion had good dispersion and excellent stability with the addition of 6 % PMMS （quality score）. Compared to pure latex film， the contact angle of the modified latex film increased from 31.1 ° to 97.8 °， and the water absorption rate decreased from 6.53 % to 2.96 %. In addition， the mechanical strength and decomposition temperature at 5 % weight loss of the modified latex film increased by 62.9 % and 75.79 °C than pure latex film， respectively.

Key words: mercapto, silicone, waterborne styrene?acrylic emulsion, emulsion polymerization

CLC Number:

TQ316.6⁺3

TAN Liqin, LIU Weiqu, LIANG Liyan, LIN Jiaming. Preparation and performance of waterborne styrene⁃acrylic emulsion modified with mercaptan silicone[J]. China Plastics, 2022, 36(1): 1-8.

Figures/Tables 13

Fig.1. Preparation of PMMS

Fig.2. Preparation of mercaptan?silicone?modified styrene?acrylic waterborne composite emulsion

Fig.3. FTIR spectra of SO and PMMS

Fig.4. 1H?NMR spectra of SO and PMMS

Fig.5. GPC spectra of PMMS

PMMS 含量/%	固含量/%	单体转化率/%	凝胶率/%	静置稳定性	钙离子稳定性	离心稳定性
0	35.5	85.66	1.09	未沉淀	少许沉淀	未分层
1	40.0	96.55	1.05	未沉淀	未沉淀	未分层
3	39.0	92.96	1.01	未沉淀	未沉淀	未分层
6	40.0	93.89	0.89	未沉淀	未沉淀	未分层
10	42.0	96.75	1.01	未沉淀	未沉淀	未分层

Tab.1. Effect of PMMS addition amount on emulsion stability

Fig.6. Static diagram of waterborne emulsions with different addition amounts of PMMS

Fig.7. Effect of addition amounts of PMMS on the contact angle of latex film

Fig.8. Effect of addition amounts of PMMS on the water absorption of latex film

Fig.9. Effect of addition amounts of PMMS on mechanical properties of latex film

Fig.10. SEM of the fracture surface of the composite latex film with different PMMS additions

Fig.11. TG and DTG curves of composite latex films with different PMMS additions

PMMS含量/%	T_d/ °C	T_d5%/ °C	T_d50%/ °C	T_max/ °C
0	360.02	231.47	392.90	386.45
1	362.83	323.68	391.17	383.72
3	366.52	301.17	392.03	385.77
6	369.33	307.26	393.21	387.55
10	372.36	307.10	397.15	390.42

Tab. 2. Decomposition temperature of composite latex films with different PMMS additions

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