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Soluble cross-linked polyvinyl alcohol polyurethane and synthesis method thereof

A technology of polyvinyl alcohol polyurethane and polyvinyl alcohol, applied in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, pharmaceutical formulations, etc., can solve the problem of uncontrollable cross-linking process chain growth and insoluble cross-linked polymers and other problems, to achieve the effect of easy operation, high product quality and simple process

Inactive Publication Date: 2006-07-19
NANKAI UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Synthesis of soluble cross-linked macromolecules has always been an important topic in the field of polymer synthesis. However, since people have been unable to control the chain growth of the cross-linking process for a long time, efforts to synthesize such macromolecules have been unsuccessful. dissolved cross-linked polymer

Method used

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  • Soluble cross-linked polyvinyl alcohol polyurethane and synthesis method thereof
  • Soluble cross-linked polyvinyl alcohol polyurethane and synthesis method thereof
  • Soluble cross-linked polyvinyl alcohol polyurethane and synthesis method thereof

Examples

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example 1

[0047] Example 1: Accurately weigh 10 g of a DMF solution of PVA with an alcoholysis degree of 14.6%, and the PVA content is 12.37%. Accurately weigh 0.5126g of MDI, dissolve it with 8mL of DMF, and pour it into the PVA solution. React at room temperature for 4 hours, and then raise the temperature to 80°C for 2 hours. The reaction at 80°C is only to completely react the remaining -NCO groups. The product was soluble in DMF at room temperature. Degree of crosslinking = 17%.

example 2

[0048]Example 2: Accurately weigh 10 g of a DMF solution of PVA with a degree of alcoholysis of 24%, and a PVA concentration of 15%. Accurately weigh 0.7116g of MDI, dissolve it with 5mL of DMF, pour it into the PVA solution, react at room temperature for 4 hours, raise the temperature to 80°C and react for another 2 hours (the heating effect is the same as that of Example 1) and the product can be dissolved in DMF. Degree of crosslinking = 32%. figure 1 It is the TEM picture of Example 2.

example 3

[0049] Example 3: Accurately weigh 10g of DMF solution of PVA with a degree of alcoholysis of 50%, the PVA concentration is 6.593%, accurately weigh 0.17876g of MDI, dissolve it with 15mL of DMF, pour it into the PVA solution, react at room temperature for 4 hours, and heat up Reaction at 80° C. for 2 hours (the heating effect is the same as in Example 1). The product can be dissolved in DMF. Degree of crosslinking = 21%.

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Abstract

The related soluble polyvinyl polyurethane with 1-50% cross-linking degree is prepared with yield as 05-100% by the polyvinyl alcohol with 10-80% alcoholysis degree and the diisocyanate with molecular weight within 2*103~2*106. This product has well properties fit to manufacture.

Description

Technical field: [0001] The present invention relates to soluble cross-linked polyvinyl alcohol polyurethane and its synthesis method. technical background: [0002] Synthesis of soluble cross-linked macromolecules has always been an important topic in the field of polymer synthesis. However, since people have been unable to control the chain growth of the cross-linking process for a long time, efforts to synthesize such macromolecules have been unsuccessful. Dissolved cross-linked polymer. In our previous research work, a mechanism controlling the cross-linking process was proposed (Fangxing Li, Zunfeng Liu, Haitao Qian, Jiaming Rui, Shengnan Chen, Ping Jiang, Yingli An and Huaifeng Mi, Macromolecules, 2004, 37, 764 -768; Fangxing Li, Zunfeng Liu, Xuping Liu, Xiaoying Yang, Shengnan Chen, Yingli An, Ju Zuo and Binglin He. Macromolecules, 2005, 38, 69-76). Using this mechanism, soluble cross-linked macromolecules can be synthesized molecular. Due to its special structure,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/62C09D175/14C09D11/10C09J175/14A61K47/34C09D11/00
Inventor 栗方星刘冬平孙瑞敏陈俊
Owner NANKAI UNIV
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