Method for preparing polyurethane hybridization material for hydroxyl-containing filler

A hybrid material, polyurethane technology, applied in the field of material science and technology, can solve the problems of material mechanical properties decline, weaken the intermolecular force, etc., and achieve the effect of low cost, excellent strength and simple process

Inactive Publication Date: 2012-07-11
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of a large number of hydrogen bonds between polyurethane molecular chains, it is the existence of these hydrogen bonds that make polyurethane produce excellent mechanical properties, and the addition of inorganic fillers will isolate the hydrogen bonds and weaken the intermolecular forces, resulting in material mechanics. Performance degradation, therefore, polyurethane materials usually rarely add fillers

Method used

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  • Method for preparing polyurethane hybridization material for hydroxyl-containing filler
  • Method for preparing polyurethane hybridization material for hydroxyl-containing filler
  • Method for preparing polyurethane hybridization material for hydroxyl-containing filler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] mass ratio n NCO / n OH = 2.2: 1, PU prepolymer: halloysite nanotube (a kind of clay-like natural nanomaterial, referred to as HNTs) = 100: 10 (mass ratio) to calculate the consumption of each raw material. After the measured polyoxypropylene glycol (PPG) with a molecular weight of 2000 is vacuum-dried at 110°C and fully dehydrated, the temperature is lowered to 80°C and a certain amount of toluene diisocyanate (TDI) is added. After reacting for 2 hours, a certain amount of HNTs is added and mixed evenly After solidification and molding at 120°C for 0.5 hours, take it out of the mold and put it in an oven at 120°C for 4 hours to cure, and test the performance after cooling.

Embodiment 2

[0031] mass ratio n NCO / n OH =2.5:1, PU prepolymer: precipitated silica (SiO 2 )=100:30 (mass ratio) to calculate the consumption of each raw material. After the polytetrahydrofuran diol (PTMG) with a molecular weight of 1500 was vacuum-dried at 130°C and fully dehydrated, the temperature was lowered to 90°C and a quantitative molar ratio of 3:1 TDI and hexamethylene diisocyanate (HDI) was added. Mixture, after reacting for 60min, add quantitative SiO 2 , after mixing evenly, solidify at 110°C for 2 hours, take it out of the mold and put it in an oven at 110°C for 8 hours, and test the performance after cooling.

Embodiment 3

[0033] mass ratio n NCO / n OH= 5.0: 1, PU prepolymer: montmorillonite (a kind of clay material, MMT for short): aluminum hydroxide = 100: 30: 10 (mass ratio) to calculate the consumption of each raw material. After the hydroxyl-terminated polybutadiene (HTPB) with a measured molecular weight of 2000 is vacuum-dried at 120°C and fully dehydrated, the temperature is lowered to 20°C and a quantitative amount of diphenylmethane diisocyanate (MDI) is added. After reacting for 24 hours, a quantitative amount of MMT and aluminum hydroxide were added dropwise with 0.1% stannous octoate of the mass of MDI, mixed evenly, cured and molded at 20°C for 7 days, and tested for performance.

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Abstract

The invention relates to a method for preparing a polyurethane hybridization material for a hydroxyl-containing filler. The method comprises the following steps of: synthesizing polymer polyalcohol and isocyanate to form a polyurethane prepolymer of which the end group is isocyanato (-NCO), and mixing the polyurethane prepolymer with an inorganic filler of which the surface contains hydroxyl (-OH) fully; and reacting -OH on the surface of the inorganic filler and -NCO at the chain end of the polyurethane prepolymer at a certain temperature to prepare the polyurethane hybridization material for the hydroxyl-containing filler, which has excellent performance. According to the method, dihydric alcohol or diamine chain extenders are not needed to be added in the preparation process, and the hydroxyl-containing inorganic filler achieves an effect of the chain extenders and cross-linking agents. According to the method, particles of the inorganic filler are dispersed uniformly and not easy to agglomerate, and an interface between the inorganic particles and a polyurethane matrix is high in bonding; and the material has the characteristics of high strength and elasticity, abrasion resistance, heat resistance, oil resistance, solvent resistance and the like, and the preparation process is simple and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane hybrid material containing hydroxyl filler. Specifically, it relates to the use of fillers containing hydroxyl groups on the surface to prepare polyurethane hybrid materials containing hydroxyl fillers and products thereof through an in-situ reaction method. The invention belongs to the field of material science and technology. Background technique [0002] Polyurethane is a multifunctional material with excellent comprehensive properties, such as excellent mechanical properties, elasticity, wear resistance and low temperature performance, good resistance to organic solvents, wide range of performance adjustments, good molding process performance, etc., in many There are a wide range of applications in technical fields such as foam plastics, coatings, elastomers, adhesives, fibers and composite materials. [0003] Polyurethane elastomers are typically prepared using polymer polyols, diis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08K3/36C08K3/34C08K3/04C08K3/22
Inventor 王小萍贾志欣贾德民陈丽娟
Owner SOUTH CHINA UNIV OF TECH
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