CN-122012007-A - Bio-based polyurethane elastic interface material and preparation method thereof

Abstract

The invention relates to a bio-based polyurethane elastic interface material and a preparation method thereof, wherein the interface material is prepared by taking bio-based raw materials such as bio-based polyol, bio-based diisocyanate and the like as main components, adding a nano reinforcing and toughening agent, polyurethane filler, black paste and functional auxiliary agent after condensation polymerization, and stirring and mixing in vacuum; the product has higher tensile strength, elongation at break, peel strength and high and low temperature resistance, reduces the dependence on fossil resources, is low-carbon and environment-friendly, meets the 'double-carbon' target and environment-friendly requirement, and is particularly suitable for bonding polyurethane mute cotton in a mute tire with the inner wall of the tire.

Inventors

• LIU XIUZHENG
• LIU WANXING
• TAO XUQUAN
• CHEN WENWEN
• CAO CUILIAN
• BI JINGLI
• LIU WEIYE

Assignees

• 聊城金歌合成材料有限公司

Dates

Publication Date

20260512

Application Date

20260318

Claims (8)

1. 1. The bio-based polyurethane elastic interface material is characterized by comprising the following components in parts by weight: 60-80 parts of bio-based polyurethane ‌ prepolymer, 6-20 parts of polyurethane filler, 5-10 parts of black paste, 2-5 parts of water scavenger, 1-2 parts of thixotropic agent, 0.5-10 parts of viscosity regulator, 0.3-1 part of coupling agent, 0.5-3 parts of nano reinforcing agent and 3-8 parts of flame retardant.
2. 2. The bio-based polyurethane elastic interface material according to claim 1, wherein the nano reinforcing agent is a multi-walled carbon nanotube, the performance index of which is that the purity is not less than 97%, the inner diameter is 3-5nm, the length is 10-50 μm, and the specific surface area is not less than 200m2/g.
3. 3. The bio-based polyurethane elastomeric interface material of claim 1 wherein the viscosity modifier is a low molecular weight methoxy silane terminated polyether having a molecular weight of 200 to 400.
4. 4. The bio-based polyurethane elastic interface material according to claim 1, wherein the bio-based polyurethane prepolymer is prepared by polycondensation reaction, and is characterized by comprising, by weight, 40-70 parts of bio-based polyol, 8-25 parts of bio-based isocyanate, 10-25 parts of reactive adhesive force toughening agent, 0.2-4 parts of antioxidant, 0.05-0.35 part of catalyst, 0.2-5 parts of chain extender, wherein the NCO content of the bio-based polyurethane prepolymer is 2.0-10.0%, and the viscosity is 5000-30000 mPa.s (25 ℃).
5. 5. The bio-based polyurethane prepolymer according to claim 4, wherein the bio-based polyol is one or a combination of ‌ vegetable oil-based polyol and bio-based polyester polyol, the performance index of ‌ vegetable oil-based polyol is ‌ hydroxyl value ‌ -450mgKOH/g, ‌ ‌ acid value ‌ is less than or equal to 2.0mgKOH/g, ‌ ‌ ‌ moisture ‌ is less than or equal to 0.1% and functionality is 2, the performance index of bio-based polyester polyol is ‌ hydroxyl value ‌ -300mgKOH/g, ‌ ‌ acid value ‌ is less than or equal to 2.0mgKOH/g, ‌ ‌ ‌ moisture ‌ is less than or equal to 0.1% and functionality is 2.
6. 6. The bio-based polyurethane prepolymer polymerization according to claim 4, wherein the bio-based isocyanate is bio-based 1, 5-Pentanediisocyanate (PDI) with the performance index of purity not less than 98%, ‌ acidity not more than 0.01%, moisture not more than 0.1%, chromaticity (platinum-cobalt color number) not more than 30 and non-volatile not more than 0.1%.
7. 7. The bio-based polyurethane prepolymer polymerization according to claim 4, wherein the reactive adhesive force toughener is hydroxyl-terminated liquid polybutadiene rubber, the performance index is ‌ hydroxyl number 25.0-36.0mgKOH/g ‌, water content is less than or equal to 0.1%, and viscosity is 4-8 Pa.s (25 ℃).
8. 8. The preparation method of the bio-based polyurethane elastic interface material is characterized by comprising the following steps: Adding the bio-based polyurethane prepolymer, polyurethane filler, water scavenger, black paste and nano reinforcing and toughening agent into a stirring tank according to a proportion, vacuumizing and stirring until the materials are fully and uniformly mixed, stopping stirring and releasing the vacuum, adding the flame retardant, the coupling agent and the viscosity regulator into the stirring tank, vacuumizing and stirring again until the materials are uniformly mixed, and obtaining the bio-based polyurethane elastic interface material.

Description

Bio-based polyurethane elastic interface material and preparation method thereof Technical Field The invention relates to the technical field ‌ of high molecular interface materials, in particular to a bio-based polyurethane elastic interface material for attaching mute cotton to the inner wall in the manufacture of automobile tires and a preparation method thereof. The interface material is particularly suitable for manufacturing the mute tire of the new energy automobile, is used for firmly adhering the polyurethane mute cotton to the inner wall of the tire so as to realize the noise reduction effect, and has the characteristics of environmental protection, high and low temperature resistance and high adhesive strength. Background With the rapid development of the automobile industry, the requirements of consumers on the automobile comfort are continuously improved, particularly ‌ new energy automobiles have higher requirements on noise reduction and comfort, tire noise is one of important factors affecting the comfort, and attention is paid increasingly, while a silent tire reduces cavity resonance and noise by sticking a sound absorbing material such as polyurethane silent cotton on the inner wall, so that the noise in the automobile is obviously reduced ‌, and the silence of driving is improved. However, the traditional mute tire interface material has the following problems of (1) poor environmental protection, toxic solvents such as toluene, benzene and the like are used in the synthesis process, VOC pollution is caused, chlorinated butyl rubber is corroded, environmental protection requirements are not met, (2) low biobased content, traditional petroleum-based interface material depends on non-renewable resources, is not sustainable and is difficult to meet sustainable development requirements, and does not meet the 'two-carbon' target requirements, (3) insufficient dynamic performance, namely insufficient peeling strength, mute cotton is easy to fall off in the dynamic use process of the tire, the mute cotton bears complex stress in the running process, displacement is easy to generate, degumming problem is easy to occur, sponge peeling and ‌ falling risk are caused, and potential safety hazards are caused, and (4) insufficient weather resistance, namely, the adhesive performance is greatly reduced under extreme weather conditions, especially in high-low temperature alternate environments, and the mute cotton falls off. Therefore, in the field of automobile tire silence, there is a strong need for a high-adhesion, high-elasticity, fast-curing, green and environment-friendly interface material, which can construct a strong and durable connection between a tire and a silence cotton, and particularly, under the conditions of high-speed running of an automobile and complex road conditions, the tire bears huge pressure and vibration, and the interface material is required to have higher adhesion force so as to ensure that the silence cotton is always firmly attached, the running noise of the automobile is greatly reduced, and a firm guarantee is provided for the silence effect. In recent years, bio-based polyurethane interface materials have been increasingly favored for their environmental friendliness and recyclability. For example, bio-based polyol prepared by taking biomass such as vegetable oil (soybean oil, castor oil, palm oil, etc.), sugar (glucose, sucrose, etc.) and the like as raw materials is used as a sustainable substitute for traditional petroleum-based polyol, and has become a focus in the field of polyurethane materials by virtue of unique properties and environmental protection advantages, and the carbon emission in the production process is obviously lower than that of petroleum-based technology, so that the bio-based polyol has environmental protection and sustainability, and meets the target requirement of double carbon. The bio-based isocyanate such as 1, 5-Pentanediisocyanate (PDI) is mainly prepared from renewable biomass resources such as corn straw, and the synthetic process is green, low-carbon and environment-friendly, has the unique advantages of sustainable development, meets the environmental protection requirements of industrial upgrading substitution and green health, and the bio-based polyurethane interface material prepared from the bio-based polyol and the bio-based isocyanate has the advantages of excellent bonding strength, good tensile strength and elongation at break, excellent mechanical property, outstanding chemical stability and excellent light resistance, low temperature resistance, weather resistance and oil resistance, so that the development of the bio-based polyurethane elastic interface material with high performance, environmental protection and good weather resistance is of great significance to the development of silent tire technology. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a bio-based polyure