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Two-component anti-sagging polyurethane waterproof coating and preparation method thereof

A polyurethane waterproof and anti-sag technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor anti-sag performance, long surface dry time and hard drying time, and improve construction applicability, surface The effect of shortening the drying time and shortening the hard drying time

Pending Publication Date: 2022-03-22
唐山凯伦新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the tensile strength of this patent can reach 6MPa and above, its surface dry time and hard dry time are long, and its anti-sagging performance is not good

Method used

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  • Two-component anti-sagging polyurethane waterproof coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Prepare Component A; prepare each raw material as follows:

[0052] Polyether 2000 Blue Star Dongda 650kg

[0053] Polyether 1000 Blue Star Dongda 50kg

[0054] MDI-MI BASF 350kg

[0055] Add polyether 2000 and polyether 1000 to the reaction kettle that can be heated and vacuumed, start stirring at 25HZ / min, turn on the vacuum, the vacuum requirement is below -0.09MPa, slowly raise the temperature to 110°C, and vacuum dehydrate for 3 hours to reach the moisture content The content is less than 0.05%. Lower the temperature to 60°C, add isocyanate, then control the temperature at 80±2°C, and pass nitrogen protection reaction for 3h while stirring. After the reaction is completed, turn on the vacuum to below -0.9MPa, vacuumize and degas for 1 hour, cool the liquid material to below 80°C, and discharge the material for packaging.

[0056] Prepare Component B; prepare each raw material as follows:

[0057]

[0058] The thixotropic agent was obtained by uniformly disp...

Embodiment 2

[0064] Basically the same as Example 1, the only difference is: when preparing component B, add 25kg diluent 230# solvent oil while adding dispersant, defoamer and thixotropic agent.

[0065] The performance of the waterproof coating of this embodiment is as follows:

[0066] The waterproof coating after mixing components A and B according to the mass ratio of 1:2 has a viscosity of 16200mpa*s at 23°C, a solid content of 98.2%, a surface-drying time of 3.5 hours, a hard-drying time of 11 hours, and 7 days The tensile strength is 7.3MPa, the elongation at break is 590%, and the surface dry time of the product is long, which is close to the minimum limit required by the standard.

[0067] The situation of scraping construction on the facade is as follows: a thick coating of 2mm flows, and a thick coating of 1mm does not flow.

Embodiment 3

[0069] Basically the same as Example 1, the only difference is that the amount of thixotropic agent in component B is changed from 8kgPM20L+80kgDINP predispersion to 6kgPM20L+80kgDINP predispersion.

[0070] The performance of the waterproof coating of this embodiment is as follows:

[0071] The waterproof coating after mixing components A and B according to the mass ratio of 1:2 has a viscosity of 29200mpa*s at 23°C, a solid content of 99.9%, a surface-drying time of 2.5 hours, a hard-drying time of 8 hours, and 7 days The tensile strength was 7.9 MPa, and the elongation at break was 677%.

[0072] The situation of scraping construction on the facade is as follows: a thick coating of 2mm flows, and a thick coating of 1mm does not flow.

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Abstract

The invention relates to a two-component anti-sagging polyurethane waterproof coating and a preparation method thereof. The preparation method comprises the following steps: reacting polyether polyol with diphenylmethane diisocyanate to obtain a component A; the plasticizer, the filler and the cross-linking agent are stirred, mixed and dehydrated until the water content is smaller than or equal to 0.15%, then the dispersing agent, the defoaming agent and the thixotropic agent are added, the mixture is uniformly dispersed, the component B is prepared, and the thixotropic agent is dispersion liquid formed by diisononyl phthalate and hydrophobic fumed silica. By improving the method, the coating does not flow on a facade with the primary thickness of 2 mm or above, the untreated tensile strength can reach 7 MPa or above, the elongation at break can reach 590% or above, and the surface drying time and the hard drying time are shortened, so that the construction applicability is greatly improved, and the construction cost is reduced. The polyurethane waterproof paint can meet the mechanical indexes of the polyurethane waterproof paint directly used as the waterproof layer in TB / T 2965-2011 Technical Conditions of Railway Concrete Bridge Dead Waterproof Layer TB / T 2965-2011.

Description

technical field [0001] The invention belongs to the field of building waterproofing, in particular to a two-component anti-sagging polyurethane waterproof coating and a preparation method thereof. Background technique [0002] The polyurethane coatings currently on the market have a high amount of solvent added, a strong smell, and are harmful to the body during construction. Especially in indoor and closed spaces, they are unsatisfactory in terms of construction comfort and environmental protection. In addition, when the existing polyurethane coating is applied on the facade and slope, it is easy to flow, and the thickness cannot be obtained. Therefore, it needs to be applied three or four times in steps to achieve the required thickness, which has the problems of long construction period, time-consuming and laborious. Furthermore, the existing polyurethane coatings still have the problems of long surface-drying time, long hard-drying time, and comprehensive properties such...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D7/61C09D7/62C09D7/63C09D7/65C08G18/48C08G18/76
CPCC09D175/08C09D7/61C09D7/62C09D7/63C09D7/65C08G18/4804C08G18/7671C08K2003/265C08K2201/011C08L91/06C08K3/26C08K5/18C08K5/12C08K7/26C08K9/00C08K13/06
Inventor 董慧颖龚志刚邓伟王硕罗博
Owner 唐山凯伦新材料科技有限公司
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