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Modified polyurethane material and preparation method thereof

A polyurethane material and modification technology, which is applied in the field of polymer materials, can solve problems such as high crystallinity and high bulk viscosity, and achieve the effects of convenient and practical operation, cheap and easy-to-obtain raw materials, and good practical value

Inactive Publication Date: 2018-05-18
CHANGCHUN NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, common linear polyester materials have disadvantages such as high bulk viscosity and high crystallinity.

Method used

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  • Modified polyurethane material and preparation method thereof
  • Modified polyurethane material and preparation method thereof
  • Modified polyurethane material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0015] The embodiment of the present invention provides a kind of preparation method of modified polyurethane material, it comprises:

[0016] S1. Mix the chain transfer agent with the cyclic ester monomer, and undergo a ring-opening polymerization reaction under the catalysis of an organometallic catalyst to obtain a star polyester compound. Wherein, the chain transfer agent is vegetable oil or its derivatives whose side chains contain hydroxyl groups.

[0017] Macromolecules with topological structures such as dendritic, comb-shaped, hyperbranched, star-shaped, and H-shaped branched chain structures and ring-shaped topological polymers are of great significance in the fields of material modification, nanotechnology and biomedicine. New functional polymers with important application prospects have been paid more and more attention by people. The embodiment of the present invention uses "Immortal" ring-opening polymerization of cyclic ester monomers to synthesize star-shaped ...

Embodiment 1

[0051] This embodiment provides a kind of modified polyurethane material, and its preparation method is as follows:

[0052] S1. Under anhydrous and oxygen-free conditions, the chain transfer agent (castor oil) and the organometallic catalyst are sequentially added in proportion to the toluene solution of the cyclic ester monomer (L-lactide monomer) (2mol / L ), its feed ratio is: organometallic catalyst 1: chain transfer agent: cyclic ester monomer=1:1:100, M n theo ≈15,300, react at a temperature of 60°C for 10 hours to obtain a star-shaped polyester compound, the product is not separated and is used for future use.

[0053] S2. Heat polytetrahydrofuran (PTMG-2000) to 120° C., and vacuum dehydrate for 3 hours.

[0054] S2. Cool down the dehydrated PTMG-2000 to 85° C., add isophorone diisocyanate, and stir for 3.5 hours to obtain a polyurethane prepolymer.

[0055] S3. Add the above-mentioned star polyester compound and small molecule chain extender (BDO) to the polyurethane...

Embodiment 2～30

[0058] Embodiments 2-30 respectively provide a modified polyurethane material, the preparation method of which is basically similar to that of embodiment 1, and the difference from embodiment 1 lies in the type and amount of raw materials, reaction temperature, time and so on. The specific preparation method can be carried out with reference to Example 1. The reaction parameters of the synthetic star polyester compound stage are shown in Table 1, and the reaction parameters of the synthetic modified polyurethane material stage are shown in Table 2, and are obtained according to the national standard GBT13022-1991 The performance of the modified polyurethane material was tested under the test conditions: 20°C, the moving speed of the gripper was 50mm / min, and the test results are shown in Table 3.

[0059] Table 1. Experimental parameters for the preparation of star-shaped polyester compounds

[0060]

[0061]

[0062] Table 2. Reaction parameters for preparing modified p...

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Abstract

The invention discloses a modified polyurethane material and a preparation method thereof, and relates to the field of polymer materials. According to the preparation method, vegetable oil of which aside chain contains a hydroxyl or a derivative thereof is taken as a chain transfer centre to perform ring opening polymerization with cyclic ester monomers to obtain a polyester compound with a star-shaped topological structure under the catalysis of an organic metal catalyst, and the polyester compound is used for preparing polyurethane. According to the preparation method, the raw materials arelow in cost and are easily obtained; and the preparation method is convenient to operate and practical, and is suitable for large-scale industrial production. By regulating the ratio of raw materials, the length of a branched chain of the modified polyurethane material can be controlled, so that the modified polyurethane material has higher practical value. According to the modified polyurethanematerial prepared by adopting the preparation method for the modified polyurethane material, the compatibility among various components is high; a phase separating phenomenon is avoided; and the modified polyurethane material has high tensile strength, high elongation at break, and excellent mechanical properties.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a modified polyurethane material and a preparation method thereof. Background technique [0002] Polyurethane has excellent adhesion, abrasion resistance, high elasticity and other properties, so it is widely used in the fields of coatings, adhesives and elastomers. However, polyurethane materials have defects in water resistance and solvent resistance. The commonly used cross-linking agents in the preparation of polyurethane are small molecule cross-linking agents, including polyol and polyamine cross-linking agents. The preparation of modified polyurethane materials with small molecular cross-linking agents is easy to operate and low in production cost, but small molecular cross-linking agents have poor compatibility and are easy to migrate in modified polyurethane materials, and the use of macromolecular cross-linking agents can improve the above problems. [0003] The "Immo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/10C08G18/40C08G18/48C08G18/42
CPCC08G18/10C08G18/4018C08G18/4288C08G18/4854C08G18/6607C08G18/664
Inventor 王春姣王玲芳陆琛张镇宇贺盟王成双李娟
Owner CHANGCHUN NORMAL UNIVERSITY
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