Polyurethane prime coat specifically for concrete surface treatment

A polyurethane primer and concrete surface technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as low curing speed, low NCO content, unsatisfactory adhesion between coatings and concrete, and facilitate construction operations , Improve the bonding strength, the effect of proper viscosity

Inactive Publication Date: 2012-04-04
JIANGSU STEADY NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the single-component use, the NCO content of this prepolymer is generally very low (less than 5%), so their viscosity will be very high. In order to facilitate construction, a large amount of solvent has to be added to the prepolymer to dilute, and at the same time , due to the low NCO content and low curing speed, a catalyst needs to be added to the solvent, so a large amount of solvent and irritating ammonia smell will be emitted during construction, seriously affecting the health of construction workers and environmental protection
Polyurethane prepolymers are cured by reacting with moisture in the atmosphere to produce allophanate. In fact, allophanate is much more brittle than urethane, so one-component polyurethane is used as the concrete base. The bonding strength between the polyurethane (or polyurea) coating and the concrete is not ideal, especially when the strength of the concrete substrate itself is very low, the bonding strength of the one-component polyurethane prepolymer is particularly obvious. insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A component

[0041]Take 54.15 parts of N220 polyether polyol and place it in the reactor, raise the temperature to 110°C, dehydrate it under -0.02mPa. vacuum condition for 2 hours, and control the moisture content to less than 0.005%. Then the temperature was lowered to 50°C, 35.85 parts of TDI was added, the temperature was raised to 85°C under the protection of nitrogen, and the temperature was maintained for 2 hours. When the measured NCO content reaches 16.67%, add 10 parts of propylene carbonate, mix evenly, cool down to 50°C and discharge to obtain component A.

[0042] Component B

[0043] 80 parts of N220 polyether polyol, 20 parts of Stepanpol PD-200LV phthalic anhydride polyester polyol, mix the above polyols evenly, and vacuum dehydrate at 110°C for 2 hours to control the moisture content below 0.02%. After cooling down to normal temperature, the material is discharged, which is component B.

[0044] Construction process:

[0045] Components A and B are ...

Embodiment 2

[0047] A component

[0048] Take 43.07 parts of N220 polyether polyol and place it in a reactor, raise the temperature to 110°C, and dehydrate it under -0.02mPa. vacuum condition for 2 hours, and control the moisture content to less than 0.005%. Then the temperature was lowered to 50°C, 46.96 parts of MDI was added, the temperature was raised to 85°C under the protection of nitrogen, and the reaction temperature was kept for 2 hours. When the measured NCO content reaches 15.46%, add 10 parts of propylene carbonate, mix evenly, cool down to 50°C and discharge to obtain component A.

[0049] B component

[0050] 65 parts of PEBA-1500 polyether polyol, 20 parts of Stepanpol PD-110LV phthalic anhydride polyester polyol, 15 parts of N303 polyether polyol, mix the above polyols evenly and dehydrate under vacuum at 110°C for 2 hours to control the low moisture content Below 0.02%. After cooling down to normal temperature, the material is discharged, which is component B.

[0...

Embodiment 3

[0054] Component A

[0055] Take 32.93 parts of N220 polyether polyol and place it in a reactor, raise the temperature to 110°C, dehydrate it under -0.02mPa. vacuum condition for 2 hours, and control the moisture content to less than 0.005%. Then lower the temperature to 50°C, add 57.07 parts of PAPI, raise the temperature to 85°C under the protection of nitrogen, and keep the temperature for 2 hours. When the measured NCO content reaches 18.12%, add 10 parts of propylene carbonate, mix evenly, cool down to 50°C and discharge to obtain component A.

[0056] B component

[0057] as example 1

[0058] Construction process:

[0059] Components A and B are weighed according to the isocyanate index of 120 and mixed vigorously with electric stirring, and evenly coated on the concrete surface within 30 minutes at 25°C, the coating amount is 0.2 kg per square meter, and the gel time of the coating film is 1 -2 hours, the surface dry time is 2-3 hours, observe the appearance qu...

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PUM

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Abstract

The present invention relates to a two-component polyurethane prime coat specifically for a concrete base surface treatment, and belongs to the field of chemical engineering materials. The polyurethane prime coat specifically for the concrete surface treatment is characterized in that: the prime coat adopts a two-component polyurethane system, wherein the two-component polyurethane system comprises an isocyanate component A and a resin component B; the two-component polyurethane of the present invention is suitable for the concrete surface treatment. According to the present invention, the polyurethane prime coat can effectively penetrate the concrete surface, and forms the tough concrete surface layer after curing; meanwhile, the two-component polyurethane provides good bonding strengths with a subsequently-constructed polyurea waterproof and anti-corrosion coating or a subsequently-constructed polyurethane waterproof and anti-corrosion coating, and a rigid polyurethane foam thermal insulation material.

Description

technical field [0001] The product of the invention relates to a two-component polyurethane primer specially used for concrete base surface treatment, and belongs to the field of chemical materials. Background technique [0002] The waterproof, anti-corrosion and thermal insulation construction of the concrete building surface has become more and more important and common means of building protection and energy saving. The commonly used waterproof and anti-corrosion materials are two-component (or one-component) spray polyurea or polyurethane coatings, and the insulation material is rigid polyurethane foam. [0003] Concrete building surfaces, especially newly-built concrete surfaces, contain a large number of defects, such as pores, pinholes, and pits. In addition, for new concrete buildings, there is usually a loose mortar floating layer due to the solidification of the concrete grout liquid surface. [0004] Due to the existence of these defects, polyurea or polyurethan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D175/06C04B41/48C04B41/63
Inventor 郁维铭史卫国任少华侯东海
Owner JIANGSU STEADY NEW ENERGY TECH DEV
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