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Nanometer polyurethane flame-retardant waterproof coating and a preparing method thereof

A waterproof coating and polyurethane technology, applied in polyurea/polyurethane coatings, fireproof coatings, coatings, etc., can solve the problems of chalking, slow drying speed, poor weather resistance, etc., and achieve the effect of improving aging resistance and speeding up drying speed

Inactive Publication Date: 2018-12-14
安徽盟拓信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of this formula is more complicated, the cost is higher, and there are certain limitations in practical application.
[0004] One-component polyurethane waterproof coatings usually use TDI, MDI and polyether as basic raw materials. The weather resistance is very poor, and it is easy to oxidize under the action of ultraviolet rays, resulting in yellowing and chalking of the coating film. At present, this problem is mainly solved by adding UV absorbers and antioxidants to improve its weather resistance, but not fundamentally change the performance of the material
In winter and other low-temperature environments, one-component polyurethane waterproof coatings generally have the disadvantage of slow drying speed. After construction, it is necessary to wait for 4-5 days or even longer before proceeding to the next step.
The above problems seriously affect the construction quality and popularization and application of one-component polyurethane waterproof coating

Method used

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  • Nanometer polyurethane flame-retardant waterproof coating and a preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of modified magnesium aluminum hydrotalcite includes the following steps:

[0024] Add magnesium-aluminum hydrotalcite and monohydroxy polydimethylsiloxane to glycerin, and perform ultrasonic dispersion to obtain a dispersion. The dispersion is heated to 90°C, and then the silane coupling agent KH550 and water are added sequentially, and the mixture is stirred and reacted evenly. 8h, cool down to 60℃ and add polypropylene imine to react for 3h.

[0025] The mass ratio of monohydroxy polydimethylsiloxane to magnesium aluminum hydrotalcite is 1:12, the mass ratio of silane coupling agent KH550 and magnesium aluminum hydrotalcite is 1:26, polypropylene imine and magnesium aluminum water The mass ratio of talc is 3:100.

Embodiment 2

[0027] The preparation method of modified magnesium aluminum hydrotalcite includes the following steps:

[0028] Add magnesium-aluminum hydrotalcite and monohydroxy polydimethylsiloxane to glycerin and perform ultrasonic dispersion to obtain a dispersion. The dispersion is heated to 80°C, and then the silane coupling agent KH560 and water are added in sequence, and the mixture is stirred and reacted evenly. 4h, cool down to 50℃ and add polypropylene imine to react for 6h.

[0029] The mass ratio of monohydroxy polydimethylsiloxane and magnesium aluminum hydrotalcite is 1:9, the mass ratio of silane coupling agent KH560 and magnesium aluminum hydrotalcite is 1:20, polypropylene imine and magnesium aluminum hydrotalcite The mass ratio of talc is 6:100.

Embodiment 3

[0031] A nano-polyurethane flame-retardant waterproof coating, calculated in parts by weight, including the following components:

[0032] 46 parts of polyether diol, 25 parts of diphenylmethylene diisocyanate, 1 part of trimethylolpropane, 15 parts of hydroxymethyl acrylate, 36 parts of didecyl phthalate, modification of Example 1 34 parts of magnesium aluminum hydrotalcite, 15 parts of nano calcium carbonate, 15 parts of nano magnesium hydroxide, 1 part of dibutyl tin dilaurate, 1 part of defoamer and 35 parts of solvent.

[0033] Preparation:

[0034] 1) Add polyether polyol, hydroxymethyl acrylate, didecyl phthalate, nano-calcium carbonate, nano-magnesium hydroxide and the modified magnesium aluminum hydrotalcite of Example 1 into the reaction kettle, stir and mix, and heat up To 100°C, then vacuum drying and dehydration;

[0035] 2) After reducing the temperature of the reactor to 80°C, add diphenylmethylene diisocyanate and react for 2 hours while stirring;

[0036] 3) Cool down...

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PUM

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Abstract

Nanometer polyurethane flame-retardant waterproof coating and a preparing method thereof are provided. The coating includes, by weight, 40-50 parts of polyether polyol, 16-32 parts of methylene diphenyl diisocyanate, 1-2 parts of trimethylolpropane, 10-20 parts of hydroxymethyl acrylate, 30-40 parts of a plasticizer, 20-40 parts of modified magnesium aluminum hydrotalcite, 10-20 parts of modifiedcalcium carbonate, 10-20 parts of nanometer magnesium hydroxide, 0.6-1.4 parts of a catalyst, 0.6-1.4 parts of a defoamer and 30-40 parts of a solvent. The modified magnesium aluminum hydrotalcite isprepared from magnesium aluminum hydrotalcite, monohydroxy polydimethylsiloxane and a silane coupling agent. The preparing method includes 1) adding the polyether polyol, the hydroxymethyl acrylate, the plasticizer and the filler into a reaction kettle, stirring and mixing the mixture, and performing vacuum drying hydration; 2) adding the methylene diphenyl diisocyanate for reaction; 3) adding thetrimethylolpropane; and 4) adding the rest materials. The coating is high in drying speed and excellent in flame retardant performance.

Description

Technical field [0001] The invention belongs to the technical field of waterproof materials, and specifically relates to a nano-polyurethane flame-retardant waterproof coating and a preparation method thereof. Background technique [0002] Polyurethane waterproof coating realizes cross-linking and curing through chemical reaction. After cross-linking and curing, it forms a highly elastic coating film with excellent comprehensive performance, which is widely used. my country has been popularized and applied since the early 1980s. It is the most successfully used coating waterproof material so far, and it occupies an important position in the application of building waterproofing. Polyurethane waterproof coatings are widely used in tunnels, subways, high-speed rails, roofs, and kitchen and bathroom projects, and have good waterproof effects. [0003] Polyurethane waterproof coatings can be divided into two types: single-component and multi-component. Multi-component polyurethane wa...

Claims

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Application Information

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IPC IPC(8): C09D175/14C09D5/18C09D7/62
CPCC09D175/14C08K2003/2224C08K2003/265C08K2201/011C09D5/18C09D7/62C08K13/06C08K9/08C08K3/26C08K9/06C08K3/22
Inventor 汪鹏郭元
Owner 安徽盟拓信息科技有限公司
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