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Transparent matte waterborne polyurethane emulsion preparation method and prepared transparent matte waterborne polyurethane emulsion

A water-based polyurethane, transparent and matte technology, applied in the field of coatings, can solve the problems of water resistance decline, paint film gloss reduction, wall whitening, etc., and achieve good compatibility, high transparency, and large roughness. Effect

Active Publication Date: 2016-05-04
ASIA PAINT SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica is commonly used in water-based matte finish varnishes (paints) to reduce the gloss of the paint film, but at the same time, a dispersant must be used to ensure the stability of the silica after dispersion. Adding a dispersant will inevitably lead to a decrease in the water resistance of the paint film after drying , the specific manifestations are large areas of whitening of the wall and foaming of the paint film after being washed by rainwater; secondly, because the dispersant cannot completely open the agglomeration of the silica powder, and cannot disperse the particle size to the nanometer scale, so A large number of large-size silica particles in the paint film will lead to a decrease in the permeability of the paint film, resulting in unclear patterns of the stone-like paint and reducing the simulation effect of the stone-like paint
[0003] In order to solve the above technical problems, Chinese patent CN103102792A discloses a water-based two-component polyurethane matte coating and a preparation method thereof. Although it has chemical resistance, high hardness, abrasion resistance, weather resistance, and low gloss, it has It is a two-component coating, the main agent and curing agent must be used immediately after mixing, the construction is more troublesome, and the drying speed is slower, the use of matting agent silica to reduce gloss has poor film permeability, and silica is easy to store for a long time Agglomeration, the dispersant used to disperse silica in the formula will reduce the water resistance of the paint film, etc.
[0004] Chinese patent CN103865031A discloses a matte water-based polyurethane emulsion, which does not add powder matting materials. Through a specific formula and process, the resin forms a unique composite structure in the film-forming process to reduce gloss, but it does not affect the composite structure. Make a clear statement, and the elaboration of the extinction mechanism is not clear, and the above technical problems are still not resolved

Method used

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  • Transparent matte waterborne polyurethane emulsion preparation method and prepared transparent matte waterborne polyurethane emulsion

Examples

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Effect test

Embodiment 1

[0026] A preparation method of transparent matte water-based polyurethane emulsion, comprising the following steps:

[0027] Step 1: Vacuumize and dehydrate 2,2-dimethylolpropionic acid (DMPA) and polycarbonate diol at 110°C for 1.2h, with a vacuum degree of 0.08mPa, to obtain prepolymer 1;

[0028] Step 2: Put the DMPA and polycarbonate diol obtained in step 1 into the reaction kettle, and add hexamethylene diisocyanate (HDI) and catalyst dibutyltin dilaurate (DBTDL) under the condition of 70°C and nitrogen protection ) reaction 2.2h;

[0029] Step 3: Detect the NCO content in the reactor, and when the NCO content reaches 90% of the theoretical value, cool down to 58°C; the molar ratio of the DMPA to polycarbonate diol is 2.5:1; the hexamethylene diol The molar ratio of isocyanate and polycarbonate diol is 0.4:1; The amount of catalyst added is 0.015% of the mass of the prepolymer obtained after step 1 treatment;

[0030] Step 4: Add neutralizing agent triethylamine to prep...

Embodiment 2

[0034] A preparation method of transparent matte water-based polyurethane emulsion, comprising the following steps:

[0035] Step 1: Vacuum dehydrate 2,2-dimethylolpropionic acid (DMPA) and polycarbonate diol at 120°C for 1 hour with a vacuum degree of 0.07mPa to obtain prepolymer 1;

[0036] Step 2: Put the DMPA and polycarbonate diol obtained in step 1 into the reaction kettle, and add hexamethylene diisocyanate (HDI) and catalyst dibutyltin dilaurate (DBTDL) under the condition of 80°C and nitrogen protection. ) reaction 2h;

[0037] Step 3: Detect the NCO content in the reactor, and when the NCO content reaches 85% of the theoretical value, cool down to 60°C; the molar ratio of the DMPA to the polycarbonate diol is 3:1; the hexamethylene diol The molar ratio of isocyanate and polycarbonate diol is 0.5:1; The amount of catalyst added is 0.02% of the mass of the prepolymer obtained after step 1 treatment;

[0038] Step 4: Add neutralizing agent triethylamine to prepolymer ...

Embodiment 3

[0042] A preparation method of transparent matte water-based polyurethane emulsion comprises the following steps:

[0043] Step 1: Vacuum dehydrate 2,2-dimethylolpropionic acid (DMPA) and polycarbonate diol at 100°C for 1 hour with a vacuum degree of 0.9mPa to obtain prepolymer 1;

[0044] Step 2: Put the DMPA and polycarbonate diol obtained in Step 1 into the kettle, and add isophorone diisocyanate and catalyst dibutyltin dilaurate (DBTDL) to react for 2.5 hours under the condition of 60°C and nitrogen protection;

[0045] Step 3: Detect the NCO content in the reaction kettle of the system, and when the NCO content reaches 95% of the theoretical value, cool down to 55°C; the molar ratio of the DMPA to the polycarbonate diol is 2:1; the isophorone The mol ratio of diisocyanate and polycarbonate diol is 0.3:1; The catalyst addition is 0.01% of the prepolymer mass obtained after step 1 treatment;

[0046] Step 4: Add neutralizing agent triethylamine to prepolymer 2 obtained aft...

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Abstract

The invention provides a transparent matte waterborne polyurethane emulsion preparation method and transparent matte waterborne polyurethane emulsion prepared with the method. The transparent matte waterborne polyurethane emulsion prepared with the method is a single-component product, and does not need an additional curing agent when in use. The transparent matte waterborne polyurethane emulsion can be directly used on substrate surface, and can form a film under normal temperature. The transparent matte waterborne polyurethane emulsion has the advantages of low gloss, high hardness, high transparency, water resistance, acid rain resistance, and the like.

Description

technical field [0001] The invention relates to the field of coatings, more specifically, to a method for preparing a transparent matte water-based polyurethane emulsion and a transparent matte water-based polyurethane emulsion prepared by the method. Background technique [0002] In recent years, water-in-water colorful paints, real stone paints, textured paints and other imitation stone paints have been widely used in building exterior wall decoration, but due to water-in-water colorful paints, real stone paints, textured paints are slightly worse in stain resistance and water resistance than traditional latex paints , so the top varnish is commonly used to improve the overall stain resistance and water resistance of the paint film. Among finish varnishes, matte finish varnishes (paints) are used in the most amount, because they can effectively reduce the light pollution caused by the reflection of sunlight on the surrounding environment of the building and the paint film ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/44C08G18/34C08G18/38C08G18/32C08G18/12C09D175/04
CPCC08G18/0823C08G18/12C08G18/348C08G18/44C08G18/6651C08G18/6659C09D175/04C08G18/289C08G18/3231
Inventor 唐嘉麟王影余先明徐志新李金钟
Owner ASIA PAINT SHANGHAI
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