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A fast-curing constrained structural damping coating and its preparation method

A technology for restraining structures and damping coatings, applied in anti-corrosion coatings, fire-resistant coatings, polyurea/polyurethane coatings, etc., can solve the problems of high construction labor intensity, narrow damping temperature range, high operation period requirements, and achieve high composite loss factor. , Widening the scope of application, excellent anti-corrosion performance

Active Publication Date: 2021-09-17
QINGDAO AIR NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current constrained structure damping coatings have the following disadvantages: (1) high viscosity, usually scraped coating construction, poor surface smoothness, high construction labor intensity, and low construction efficiency; (2) because the damping material used is solvent-free The two-component material has high requirements on the operation period during construction, and it is especially inconvenient to construct in summer. It needs to be mixed evenly after a small amount of multiple times; (3) Since the constraining layer is a high-modulus epoxy resin system, it is easy to appear when the thickness exceeds 20mm. For cracking problems, grid cloth needs to be laid to reduce the risk of cracking, which increases the difficulty of construction; (4) The curing speed of two-component epoxy resin is very slow in winter, and thick coating construction is prone to sagging problems; (5) Damping The damping temperature range of the material is narrow, and the loss factor (tanδ) is still low, which cannot meet the current vibration and noise reduction requirements of large ships and equipment in low temperature environments
(6) Due to many problems in the construction of constrained structural damping coatings, its application in the fields of automobiles, construction machinery, and rail transit is limited

Method used

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  • A fast-curing constrained structural damping coating and its preparation method
  • A fast-curing constrained structural damping coating and its preparation method
  • A fast-curing constrained structural damping coating and its preparation method

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preparation example Construction

[0078] In addition, the present invention also provides a method for preparing the fast-curing constrained structural damping coating as described above, including:

[0079] Preparation of the damping layer: Add the glycol, dispersant, defoamer, and damping pigments and fillers into the reaction kettle, start stirring, heat up to 100-110°C while stirring, and vacuumize; when the vacuum degree reaches At -0.1MPa, dehydrate for 1.5-2 hours, then lower the temperature to 50-60°C, add the diisocyanate dropwise, and then raise the temperature to 80-90°C after the dropwise addition, keep the temperature for 2-4 hours, and wait until the NCO content reach 4.0-8.0 wt%, lower the temperature to 50-60°C, add the adhesion promoter, substrate wetting agent, catalyst, latent chain extender and stir evenly to obtain the damping layer;

[0080] The preparation of the A component: Put the polyol and liquid flame retardant into the reaction kettle protected by nitrogen, heat to 100-110°C under...

Embodiment 1

[0086] 1. Preparation of damping layer

[0087] Add 200 parts of polyether DL1000, 5 parts of dispersant BYK110, 1 part of defoamer BYK141, 2 parts of defoamer BYK066N, 500 parts of 200-mesh mica powder into the reaction kettle, start stirring, and heat up to 100°C while stirring. Vacuum. When the vacuum degree reaches -0.1MPa, after dehydration for 2 hours, lower the temperature to 50-60°C, continue to add 65 parts of IPDI, after the dropwise addition, raise the temperature to 80-90°C, keep the temperature for 4 hours, and wait until the -NCO content reaches After the target value is 7.0%, lower the temperature to 40-50°C, add 1.0 parts of vinyltrimethoxysilane of adhesion promoter, 0.5 parts of substrate wetting agent Wet260, 1.0 parts of first catalyst dibutyltin dilaurate, 152.2 After mixing one part of latent chain extender Hardener OZ evenly, it can be filtered and packaged for discharge.

[0088] 2. Preparation of Constraint Layer

[0089] (1) Preparation of componen...

Embodiment 2

[0097] 1. Preparation of damping layer

[0098] Add 150 parts of polytetrahydrofuran glycol PTMEG650, 10 parts of dispersant Dispers912, 2 parts of defoamer Tego940, 3 parts of defoamer BYK141, 300 parts of 200-mesh mica powder, 200 parts of 80-mesh graphite powder into the reactor, and start stirring , heated up to 100°C while stirring, and vacuumed. When the vacuum reaches -0.1MPa, after dehydration for 2 hours, lower the temperature to 50-60°C, continue to add 100 parts of HMDI, after the dropwise addition, raise the temperature to 80-90°C, keep the temperature for 2-4 hours, and wait for -NCO After the content reaches the target value of 5.0%, lower the temperature to 40-50°C, add 2.0 parts of γ-glycidyl etheroxypropyl trimethoxysilane of adhesion promoter, 1.0 parts of substrate wetting agent BYK333, 2.0 parts of first After the catalyst tetrabutyl titanate and 83.9 parts of latent chain extender VestaminA139 are stirred evenly, they can be filtered, packaged and dischar...

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Abstract

The invention proposes a fast-curing constrained structure damping coating and a preparation method thereof, which belong to the technical field of special functional materials. Chain agent, glycol, dispersant, defoamer, substrate wetting agent, adhesion promoter, first catalyst, damping pigment and filler; constraining layer is two-component solvent-free polyurethane coating, including component A: isocyanate , polyol, liquid flame retardant; B component: amino-terminated polyether, polyether polyol, flame retardant pigments and fillers, hollow microspheres, chain extender, second catalyst, antioxidant, dispersant, water remover , Color paste. The damping paint of the present invention, the curing speed of the damping layer and the constraining layer can be adjusted, and can be quickly cured in winter construction without sagging. The material can not only be applied to the vibration and noise protection in the field of ships, but also can be widely used in rail transit, automobiles, etc. , construction machinery and other fields.

Description

technical field [0001] The invention relates to the technical field of special functional materials, more specifically, the invention relates to a fast-curing constrained structural damping coating and a preparation method thereof. Background technique [0002] A lot of practice has proved that applying damping coatings to noise and vibration control is the most feasible and economical method. Damping coatings are special functional coatings prepared by utilizing the viscoelastic properties of organic polymer materials. When the polymer materials are within the glass transition temperature range, they have very good dynamic mechanical loss properties and can well reduce vibration and noise. The mechanical energy is converted into thermal energy and released to achieve the purpose of reducing the amplitude, vibration and noise. [0003] According to the structural form, damping coatings can be divided into free structural coatings and constrained structural damping coatings....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D175/04C09D175/06C09D5/08C09D7/61C09D7/63C09D5/18
CPCC08K2003/2224C08K2003/2227C08K2003/2272C08K2003/2275C08L2201/02C09D5/08C09D5/18C09D175/04C09D175/06C09D175/08C09D7/61C09D7/63C09D7/70C08K5/5425C08K3/34C08K3/042C08K5/5435C08K3/22C08K7/00C08K3/40C08K13/04C08K7/28C08K9/00C08K5/1345C08K5/524C08K7/24C08K13/06
Inventor 王宝柱温喜梅王伟李灿刚
Owner QINGDAO AIR NEW MATERIALS
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