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Preparation method of polyurethane nanometer composites

A technology of nanocomposite materials and polyurethane, which is applied in the field of natural polymer nanocomposite materials, can solve problems such as hindering the interaction between cellulose nanocrystals and the matrix interface, limiting the application of cellulose nanocrystals, etc., and achieving the effect of low cost and simple process

Active Publication Date: 2012-07-25
重庆盾之王安防设备技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large number of hydroxyl groups on the surface of cellulose nanocrystals, hydrogen bonds will be formed in the solution, which hinders the interfacial interaction between cellulose nanocrystals and the matrix, and also limits the industrial application of cellulose nanocrystals.

Method used

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  • Preparation method of polyurethane nanometer composites
  • Preparation method of polyurethane nanometer composites
  • Preparation method of polyurethane nanometer composites

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A preparation method of polyurethane nanocomposite material, it comprises the steps:

[0025] 1) Surface modification of nanoparticles [Using cellulose nanocrystals (CN) as the nanofiller of polyurethane, introducing -C(=O)CH which has good surface compatibility with oily polyurethane through one-step modification 3 Functional group]: According to the ratio of cellulose nanocrystals, acetic anhydride, and anhydrous pyridine: 1g: 5ml: 30ml, select cellulose nanocrystals, acetic anhydride, and anhydrous pyridine for later use; vacuum-dry cellulose nanocrystals for 30 minutes before reacting (vacuum degree is 0.1~0.5MPa, temperature is room temperature);

[0026] Dissolve cellulose nanocrystals (CN) in anhydrous pyridine first, then ultrasonically disperse for 15 minutes, and react with acetic anhydride under heating and nitrogen protection conditions (high-purity nitrogen is passed through the reaction, purity ≥ 99.9wt%), and the heating reaction temperature at 80°C, the...

Embodiment 2

[0034] A preparation method of polyurethane nanocomposite material, it comprises the steps:

[0035] 1), basically the same as step 1) in Example 1, the difference is:

[0036] According to the ratio of cellulose nanocrystals, acetic anhydride and anhydrous pyridine as 1g: 8ml: 30ml, select cellulose nanocrystals, acetic anhydride and anhydrous pyridine for future use; the rest of the steps are the same as step 1) in Example 1.

[0037] 2), and step 2) in embodiment 1) is basically the same, the difference is:

[0038] The added amount of the solvent tetrahydrofuran is 65% of the total mass of the modified nanoparticles, castor oil-based polyurethane prepolymer, chain extender and tetrahydrofuran; the rest of the steps are the same as step 2) in Example 1.

[0039] The mechanical property data of this embodiment gained polyurethane nanocomposite material is: modulus of elasticity (E) 1.60MPa, tensile strength (σ b )6.21MPa, elongation at break (ε b ) 293.13%. The measureme...

Embodiment 3

[0041] A preparation method of polyurethane nanocomposite material, it comprises the steps:

[0042] 1), basically the same as step 1) in Example 1, the difference is:

[0043] According to the ratio of cellulose nanocrystals, acetic anhydride, and anhydrous pyridine as 1g: 5ml: 35ml, select cellulose nanocrystals, acetic anhydride, and anhydrous pyridine for subsequent use; the rest of the steps are the same as step 1) in Example 1.

[0044] 2), and step 2) in embodiment 1) is basically the same, the difference is:

[0045] According to the mass ratio of castor oil and toluene diisocyanate as 3: 1, the castor oil after drying is reacted with toluene diisocyanate (TDI) to form carbamate groups to obtain castor oil-based polyurethane prepolymer, and the remaining steps are the same Step 2) in Example 1.

[0046] The mechanical property data of this embodiment gained polyurethane nanocomposite material is: modulus of elasticity (E) 1.59MPa, tensile strength (σ b )6.665MPa, el...

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Abstract

The invention relates to a preparation method of polyurethane nanometer composites, which belongs to the field of natural high-polymer nanometer composites. The preparation method is characterized by including the following steps of 1) finishing the surface of nanometer particles, utilizing cellulose nanocrystalline (CN) as nanometer filler of polyurethane, introducing -C(=O)CH3 functional group having excellent surface compatibility with oily polyurethane by one-step finishing to obtain finished nanometer particles; 2) compounding the finished nanometer particles with castor-oil based polyurethane to obtain the polyurethane nanometer composites. The polyurethane nanometer composites have high elasticity modulus (E), tensile strength (ob) and breakage elongation (epsilon b). The preparation method is low in cost and simple in process.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane nanocomposite material, which belongs to the field of natural polymer nanocomposite materials. Background technique [0002] Cellulose is the most abundant natural organic matter in the world, accounting for more than 50% of the carbon content in the plant kingdom. Cellulose contains crystalline aggregates with strong hydrogen bonds, which are collectively called cellulose fibers, and are called microcrystals, long fibers, short fibers, and whiskers due to differences in shape and size. The strong hydrogen bonding inside the cellulose fibers and the active hydroxyl groups on the surface are considered to be a superior polymer material for reinforcing fillers. In particular, cellulose nanowhiskers, with their nanoscale high specific surface area and rod-like rigid structure, can greatly improve the mechanical properties of materials. However, the application of cellulose is limited due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L1/12C08J5/18C08B3/06
Inventor 黄进林松章桥新魏思文任红轩
Owner 重庆盾之王安防设备技术研究院有限公司
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