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High-performance polyurea damping material and preparation method thereof

A damping material and high-performance technology, applied in the field of damping materials, can solve the problems of poor resistance to liquid media, low construction efficiency, thick coating, etc.

Inactive Publication Date: 2021-02-19
QINGDAO AIR NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional water-based damping coating has the following disadvantages: (1) its physical and mechanical strength is low, and it is prone to peeling and cracking when it is impacted by external forces; (2) because its matrix resin is mainly various thermoplastic water-based resins , so its long-term water resistance, corrosion resistance, mold resistance, and liquid medium resistance are poor, and it is not suitable for coating on the outer surface of workpieces and applications in harsh corrosive environments; (3) Water-based damping coatings are first in the curing process The moisture in it needs to be volatilized to solidify and form a film. Therefore, when the temperature is low and the humidity is high, the drying speed is very slow or even non-curing occurs. The problem is particularly serious when thick coating; (4) The solid content of water-based damping coatings is average It is about 60%. If the one-time coating thickness is too thick, the problem of shrinkage and cracking is likely to occur. This problem is especially serious in the details such as yin and yang corners; (5) For some substrates with large thickness, water-based damping When coating, multi-layer and multi-layer construction is required, and the next layer of construction needs to be fully cured after the previous layer of coating, and the construction efficiency is low
Judging from the molecular structure of polyurea materials, polyurea materials have a special soft segment-hard segment block structure, which makes it possible for them to be used as damping and vibration-absorbing materials, but the glass transition temperature (Tg ) range is very narrow, generally only 20 ~ 30 ℃, it is difficult to meet the requirements of vibration damping in a wide temperature range, which limits the application of polyurea materials as damping materials in the field of vibration and noise reduction

Method used

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preparation example Construction

[0055] The present invention also provides a method for preparing the above-mentioned high-performance polyurea damping material, comprising the following steps:

[0056] (1) Preparation of component A: Prepare raw materials according to the formula, add polyols and reactive liquid flame retardants into a closed high-speed disperser mixing tank for pre-mixing for 10-15 minutes, control the speed at 200-400r / min, Then put it into the reactor with nitrogen protection, heat to 95-100°C under stirring, dehydrate under vacuum -0.1MPa for 5-6h, release the vacuum, cool down to below 50°C and add polyisocyanate, at 80-85°C React for 3-4 hours. After the reaction is over, measure the -NCO value and discharge the material, filter and pack;

[0057](2) Preparation of component B: Prepare raw materials according to the formula, add steric chain extender, amino-terminated polyether, polyol, dispersant, defoamer, ultrafine powder flame retardant and flake functional filler to the Pre-mix ...

Embodiment 1

[0060] A kind of high-performance polyurea damping material, its formula composition is as shown in table 1:

[0061] Table 1 Embodiment 1 High-performance polyurea damping material formula composition

[0062]

[0063]

[0064] The preparation method of above-mentioned high-performance polyurea material is:

[0065] (1) Synthesis of component A of terminal isocyanate prepolymer: add 50 parts of DL1000 and 20 parts of tris(dipropylene glycol) phosphite according to the formula amount into a closed high-speed disperser mixing tank for pre-mixing 10- 15min, the rotation speed is controlled at 200-400r / min, and then put into the reaction kettle protected by nitrogen gas, heated to 95℃~100℃ under stirring, dehydrated under vacuum -0.1MPa for 5-6h, release the vacuum, and cool down to 50 Add 60 parts of MDI-30 below ℃, react at 80-85℃ for 3-4h, after the reaction, measure -NCO value reaches 12.5±0.5%, discharge the material, filter and pack;

[0066] (2) Preparation of comp...

Embodiment 2

[0069] A kind of high-performance polyurea damping material, its formula composition is as shown in table 2:

[0070] Table 2 Example 2 High-performance polyurea damping material formula composition

[0071]

[0072] The preparation method of above-mentioned high-performance polyurea material is:

[0073] (1) Synthesis of component A of terminal isocyanate prepolymer: add 40 parts of GMN3050 and 30 parts of N,N-bis(2-hydroxyethyl)aminomethylene phosphonic acid diethyl ester according to the formula amount into the closed Premix in the stirring tank of the high-speed disperser for 10-15min, the speed is controlled at 200-400r / min, and then put into the reaction kettle protected by nitrogen, heated to 95°C~100°C under stirring, under vacuum -0.1MPa Dehydration for 5-6 hours, release the vacuum, lower the temperature to below 50°C, add 80 parts of IPDI, react at 80-85°C for 3-4 hours, after the reaction, measure the -NCO value to 15.8±0.5%, discharge the material, filter and ...

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Abstract

The invention provides a high-performance polyurea damping material, and belongs to the technical field of damping materials. The material is composed of a component A and a component B. The componentA is an isocyanate-terminated prepolymer, and is formed by reacting polyisocyanate, polyol and a reactive liquid flame retardant, and the -NCO content of the component A is 12-16%; the component B isformed by mixing a steric hindrance chain extender, amine-terminated polyether, polyhydric alcohol, a dispersing agent, a defoaming agent, an ultrafine powder flame retardant, a coupling agent, a weather-proof additive, a catalyst, a flaky functional filler, a water removal agent and color paste; and the isocyanate index alpha value of the component A and the component B is 0.9-1.1. The inventionfurther provides a preparation method of the high-performance polyurea damping material. The high-performance polyurea damping material provided by the invention has very excellent mechanical properties and very good damping performance, also has relatively good flame retardance, water resistance, liquid medium resistance, corrosion resistance, mold resistance and aging resistance, and is easy toconstruct, safe, environment-friendly and wide in application range.

Description

technical field [0001] The invention relates to the technical field of damping materials, more specifically, the invention relates to a high-performance polyurea damping material and a preparation method thereof. Background technique [0002] With the five major speed increases of railways and the rise of rail transit in major cities, rail transit has increasingly become the main form of national transportation. However, as the speed continues to increase, rail transit has higher and higher requirements for tracks, sleepers, and ballast beds. How to ensure the reduction of all kinds of damage caused by vibration and the troubles caused by noise under high-speed conditions have become an important issue in the development of rail transit in our country. A lot of practice has proved that applying damping coatings to noise and vibration control is the most feasible and economical method. Damping coating is a special functional coating prepared by utilizing the viscoelasticity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/02C09D5/18C09D5/14C09D5/08C09D7/61C09D7/63C08G18/76C08G18/75C08G18/73C08G18/66C08G18/50C08G18/48C08G18/32C08G18/12
CPCC09D175/02C09D5/18C09D5/14C09D5/08C09D7/61C09D7/63C09D7/70C08G18/7671C08G18/755C08G18/765C08G18/735C08G18/4825C08G18/4829C08G18/3887C08G18/3889C08G18/3878C08G18/6666C08G18/12C08G18/6685C08K2003/2224C08K2003/2227C08L2201/02C08K13/04C08K7/26C08K3/22C08K3/34C08K13/02C08K3/38C08K3/04C08K5/06C08K5/353C08G18/66
Inventor 王宝柱王伟温喜梅李灿刚
Owner QINGDAO AIR NEW MATERIALS
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