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Preparation method of hyperbranched polyurethane/polyacrylate damping material

A technology of hyperbranched polyurethane and polyacrylate, which is applied in the field of preparation of hyperbranched polyurethane/polyacrylate damping materials, can solve the problems of unreported hyperbranched polyurethane/polyacrylate LIPN, etc., and is beneficial to large-scale production, The effect of low viscosity and easy availability of raw materials

Inactive Publication Date: 2012-10-17
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, there have been many studies on polyurethane / polyacrylate latex interpenetrating network IPN, but the preparation of hyperbranched polyurethane / polyacrylate LIPN has not been reported.

Method used

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  • Preparation method of hyperbranched polyurethane/polyacrylate damping material
  • Preparation method of hyperbranched polyurethane/polyacrylate damping material
  • Preparation method of hyperbranched polyurethane/polyacrylate damping material

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The present invention will be further described below in conjunction with embodiment. The content involved in the present invention is not limited to the following examples. Embodiment 1: Preparation of hydroxyl-terminated hyperbranched polyurethane

[0035] 1. The composition of each raw material is as follows in terms of parts by mass:

[0036]

[0037] 2. Specific preparation process:

[0038] Weigh IPDI and DMPA and dissolve in N,N′-dimethylformamide (DMF), stir evenly, pass nitrogen into the system, remove the air in the system, raise the temperature to 85°C for 1.5h, then cool down to -5~0 ℃, slowly drop the DMF solution of DEOA, continue to stir for 30min after the dropwise addition, then raise the temperature to 60℃ for 2.0h, and obtain hyperbranched polyurethane (HBPU) through vacuum distillation. Its number average molecular weight was determined to be 3912 by vapor pressure osmosis (VPO).

Embodiment 2

[0040] Each raw material is constituted as follows by mass parts:

[0041]

[0042] 1. Preparation of polyurethane prepolymer

[0043] Add TDI and N210 (relative molecular mass 1000) into the three-necked flask, pass nitrogen to remove the air in the system, react at 80°C for 2.5 hours, then add DMPA and BDO, react at 75°C for 2.5 hours; cool down to 60°C, add HEMA Partial end-capping reaction was carried out for 1.5 hours to obtain a polyurethane prepolymer.

[0044] 2. Preparation of hyperbranched waterborne polyurethane prepolymer

[0045] Add HBPU to the polyurethane prepolymer prepared in step 2, react at 75°C for 2 hours to obtain a hyperbranched waterborne polyurethane prepolymer, and add a small amount of acetone to reduce the viscosity of the system.

[0046] 3. Polymerization reaction

[0047] Add 1 / 3 of St and 1 / 3 of BA to the hyperbranched polyurethane prepolymer prepared in step 2 below 45°C, stir for 20 minutes, add TEA for neutralization reaction for 15 mi...

Embodiment 3

[0050] Each raw material is constituted as follows by mass parts:

[0051]

[0052] The preparation method is the same as in Example 2.

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Abstract

The invention discloses a preparation method of hyperbranched polyurethane / polyacrylate damping material, which comprises the following preparation steps: (1) partially end capped waterborne polyurethane prepolymer is synthesized by a traditional method; (2) the self-made hydroxyl-terminated hyperbranched polyurethane is reacted with isocyanate group to be grafted to the waterborne polyurethane prepolymer, thereby obtaining hyperbranched waterborne polyurethane prepolymer; (3) triethylamine and partial vinyl monomer are added in the prepolymer to ionize, and added with water to disperse to obtain polyurethane / vinyl monomer dispersing liquid under high-speed stirring; (4) the temperature of the dispersing liquid is raised to 65-80 DEG C, and the dispersing liquid is dripped with residual vinyl monomer, initiator and a crosslinking agent to react for 2-6h in heat preservation; and the reacted liquid is cooled to obtain the hyperbranched polyurethane / polyacrylate emulsion. The material obtained by coating the hyperbranched polyurethane / polyacrylate emulsion and curing has the characteristics of excellent damping performance and heat resistance, can be used in the fields such as automobile industry and constructional engineering, and has wide application prospect.

Description

1. Technical field [0001] The invention relates to a preparation method of a damping material, in particular to a preparation method of a hyperbranched polyurethane / polyacrylate damping material. 2. Background technology [0002] Noise pollution and its hazards have attracted more and more attention, and the research and development of damping materials and technologies have also attracted more and more attention from scholars. be widely used. Damping material refers to the material that converts the mechanical vibration energy of a solid into heat energy and dissipates it, and is mainly used for vibration reduction and noise reduction. Polymer damping material is a functional material that uses polymer as a matrix to suppress vibration and reduce noise. In polymer damping materials, the Tg transition temperature range of general homopolymers and random copolymers is relatively narrow, and the applicable temperature range is limited. The effective damping temperature range...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F212/08C08F220/18C08F220/14C08F220/44C08G83/00
Inventor 吴庆云杨建军吴明元张建安周月姣
Owner ANHUI UNIVERSITY
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