Preparation of organic silicon modified polyurethane elastic body and application thereof

A polyurethane elastomer, polyurethane prepolymer technology, applied in mechanical equipment, engines, wind turbines and other directions, can solve the problems of poor aging resistance, delay, low, only 2.2 ~ 4.2MPa, etc.

Inactive Publication Date: 2011-06-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are few patent reports about organosilicon-modified polyurethane. For example, CN 1470544 discloses a preparation method of amino silicone oil-modified polyurethane. Although the prepared polyurethane has good heat resistance and surface properties, its tensile strength is relatively low. Low, only 2.2~4.2MPa, not suitable for the field of application of the present invention; CN 101516949 (formerly US 2007 / 020390 and WO2008 / 036365) discloses the polyurethane foam material composition with organosilicon surfactant, and it has the improved foam of delay The catalysis of material hardness and the foam opening property of improvement are also not suitable for the field of application of the present invention; CN 101348554 discloses a kind of preparation of organosilicon modified water-based polyurethane, which is mainly used for surface coating; CN 1854165 discloses a A silicone-modified waterborne polyurethane, mainly used in coatings, finishing agents and adhesives
Some papers have reported organosilicon-modified polyurethane, generally using silanol (Eur.Polym.J.1999, 35(11): 1959; Polyurethane Industry, 2000, 15(4): 18) or amino silicone oil (Journal of Nanjing University ( Natural Science Edition), 2002, 38 (2): 205); it is also reported that KH-560 (γ-glycidoxypropyltrimethoxysilane) modified polyurethane synthesized a modified polyurethane elastomer (Synthetic Rubber Industry, 2005, 28(1): 26), however, the elastomer has poor mechanical properties, and the modulus is lower than 5.5MPa
[0006] In conclusion, although the wear resistance of (unmodified) polyurethane elastomers reported in the aforementioned patents or papers has been improved, it does not involve aging resistance (based on molecular structure analysis, their aging resistance is poor), and the resistance to moisture and thermal hydrolysis is also lower; while the use of organosilicon-modified polyurethane elastomers has improved aging resistance, but poor mechanical properties

Method used

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  • Preparation of organic silicon modified polyurethane elastic body and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Synthesis of Example 1 Silicone Modified Polyether Polyurethane Elastomer (I)

[0020] In a closed reactor under nitrogen protection, under stirring at a rate of 2000rpm, add the following components (parts by mass) in sequence: polyether polyurethane prepolymer [tensile strength (MPa) > 25, Shore A hardness of 90 ±2, elongation at break (%) > 350, tear strength (KN / M) > 50, brittle temperature (°C) 3 ), the reaction was continued for 2h at 85±2°C and 1600rpm with stirring. Lower the temperature to 50° C., and vacuum to 50 mmHg to remove solvents and small molecular compounds. Then add 5 parts by mass of MOCA, and stir for 20 min at a rate of 1600 rpm. Injection molded in a Teflon mold, pre-cured at room temperature for 2 days, and then cured at 55-65°C for 5 days.

Embodiment 2

[0021] Synthesis of Example 2 Silicone Modified Polyether Polyurethane Elastomer (II)

[0022] Prescription and experimental operation are with embodiment 1, and difference is the polyether type polyurethane prepolymer of application following technical parameter: tensile strength (MPa)>38, Shore A hardness is 92 ± 1, elongation at break (% )>430, tear strength (KN / M)>90, brittleness temperature (°C)<-50.

Embodiment 3

[0023] Synthesis of Example 3 Silicone Modified Polyester Polyurethane Elastomer (Ⅲ)

[0024] Prescription and experimental operation are with embodiment 1, and difference is the polyether type polyurethane prepolymer of application following technical parameter: tensile strength (MPa)>45, Shore A hardness is 85 ± 2, elongation at break (% )>550, tear strength (KN / M)>75, brittle temperature (°C)<-30.

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Abstract

The invention relates to an organic silicon modified polyurethane elastic body composition which comprises the following components (in parts by weight): 100 parts of polyurethane prepolymers, 5-20 parts of HTPB (Hydroxyl-Terminated Polybutadiene), 5-25 parts of HTLN, 3-15 parts of poly-dimethyl siloxane, 0.1-1.0 part of catalyst, 3-10 parts of solidifying agents and 0-30 parts of solvents. The invention also relates to a method for preparing the organic silicon modified polyurethane elastic body, which comprises the following steps of: reacting the composition not containing the solidifying agents for 3-6h at 80-120 DEG C by stirring at a high speed (1000-5000rpm) in a nitrogen atmosphere, and removing the solvents and other micromolecules in a vacuum state; then adding the solidifying agents, uniformly stirring and mixing at the high speed, injection molding, pre-solidifying for 1-2 days at a room temperature, and then solidifying for 4-7 days at 55-65 DEG C. The synthesized organic silicon modified polyurethane elastic body has the advantages of favorable wear resistance, high elasticity and excellent weather-resistance and moist heat-resistance stability.

Description

field of invention [0001] The present invention relates to a silicone-modified polyurethane elastomer, more specifically, to a silicone-modified polyurethane elastomer with improved aging resistance and abrasion resistance, its preparation method, and its use as a wind power generator Application of anti-corrosion protection materials for blades. Background of the invention [0002] Polyurethane elastomers are a series of elastomeric materials containing urethane groups and / or isocyanates on the polymer backbone. In addition to the above-mentioned groups, the polymer chain also contains (carboxylic acid) ester groups, ether bonds, urea groups, aryl groups and aliphatic chains, etc., usually formed by the reaction of oligomer polyols, polyisocyanates and chain extenders . The elastic modulus of polyurethane elastomer is between that of rubber and plastic, and its biggest advantage is that it has both high hardness and high elasticity. Polyurethane elastomers have good stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/69C08G18/66C08G18/61C08L75/06C08L75/08C08L75/14F03D11/00
CPCY02E10/722Y02E10/72
Inventor 朱立群张红梅何涛陈贻炽刘慧丛李卫平
Owner BEIHANG UNIV
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