Room-temperature self-crosslinking wood lacquer emulsion and preparation method thereof

A technology of self-crosslinking and wood varnish, applied in the direction of coating, etc., can solve problems such as poor hardness, falling off, low crosslinking density, etc.

Inactive Publication Date: 2014-12-03
上海展辰涂料有限公司 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country's water-based wood coatings still have limitations in key technologies, resulting in a certain gap between their paint films and solvent-based coatings in terms of hardness, water resistance, and stability.
The most widely used acrylate emulsion in water-based wood lacquers is "hot sticky and cold brittle" due to its low cross-linking density. During use...

Method used

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  • Room-temperature self-crosslinking wood lacquer emulsion and preparation method thereof
  • Room-temperature self-crosslinking wood lacquer emulsion and preparation method thereof
  • Room-temperature self-crosslinking wood lacquer emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of room temperature self-crosslinking wood paint emulsion, comprising the following steps:

[0027] (1) Add 3.75g of emulsifier (SR-10) and 200g of deionized water into a 1000 mL four-neck flask equipped with a stirring device, a thermometer and nitrogen protection in sequence, stir, raise the temperature to 75°C, and stop heating;

[0028] (2) In an emulsification kettle, dissolve 4.5g of emulsifier (SR-10), 3.5g of sodium styrene sulfonate in 150g of deionized water, then dissolve 98g of methyl methacrylate, 100g of styrene, and 96g of butyl acrylate , 11g of glycidyl methacrylate, 5.6g of methacrylic acid, 8g of diacetone acrylamide, and 0.8g of tert-dodecylmercaptan were added to the emulsifier aqueous solution in a high-speed dispersion state, and stirred for 30-40min to prepare Obtain monomer pre-emulsion;

[0029] (3) Add 5% monomer pre-emulsion to the reaction kettle, add 0.6g sodium persulfate (dissolved in 5g deionized water) aqueous solu...

Embodiment 2

[0034] A preparation method of room temperature self-crosslinking wood paint emulsion, comprising the following steps:

[0035] (1) Add 3.5g SR-10 and 200g deionized water to a 1000mL four-necked flask equipped with a stirring device, a thermometer and nitrogen protection in sequence, stir, raise the temperature to 75°C, and stop heating;

[0036] (2) In an emulsification kettle, dissolve 8.25g SR-10 in 150g deionized water, then mix 93.8g methyl methacrylate, 80g styrene, 102g butyl acrylate, 9g glycidyl methacrylate, 5.9g Add methacrylic acid, 9 grams of diacetone acrylamide, and 1 g of n-dodecyl mercaptan to the emulsifier aqueous solution in a high-speed dispersion state, and stir for 30-40 minutes to obtain a monomer pre-emulsion;

[0037] (3) Add 5% monomer pre-emulsion to the reaction kettle, add 0.5g sodium persulfate (dissolved in 5g deionized water) aqueous solution, and keep warm for 15 minutes.

[0038] (4) When the temperature of the reactor reaches 80°C, add the...

Embodiment 3

[0042] Preparation of water-based wood lacquer: Add 160g of synthetic emulsion into the dispersion kettle, add 1g of pH adjuster AMP-95 under stirring, adjust the pH to 8-9, add 0.8g of defoamer BYK-093, 0.8g Thickener PU337, disperse at 1500 r / min for 15 minutes, add 8g diethylene glycol butyl ether, 8g dipropylene glycol butyl ether, disperse at 1000 r / min for 10 minutes, then add 1.2g H140 substrate wetting agent, 0.2g BYK -028, adjust the viscosity with water, disperse at 1000 r / min for 15 minutes.

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Abstract

The invention relates to a room-temperature self-crosslinking wood lacquer emulsion which is characterized by being prepared from the following components: methyl methacrylate, styrene, butyl acrylate, diacetone-acryloamide, glycidyl methacrylate, methacrylic acid, polycarbodiimide resin, adipic dihydrazide, an emulsifier, an initiator, a neutralizer, a molecular weight regulator and deionized water. The preparation method comprises the following steps: adding 10-50% of emulsifier aqueous solution into a reaction kettle, stirring and raising the temperature; in an emulsifying kettle, sequentially adding monomer materials into the residual emulsifier aqueous solution in a high speed disperse state and stirring; then, adding 5% of monomer pre-emulsion into the reaction kettle, adding an initiator solution, and starting to add the residual emulsion and initiator solution dropwise when the temperature of the reaction kettle reaches 80 DEG C, and then starting cooling the reaction kettle; and adding the neutralizer, adipic dihydrazide and polycarbodiimide resin into the reaction kettle, stirring for 30-40 minutes and filtering and packaging. According to the room-temperature self-crosslinking wood lacquer emulsion provided by the invention, cross-linking reaction of diacetone-acryloamide and adipic dihydrazide, polycarbodiimide resin and methacrylic acid is adopted, and the double crosslinking reaction is of great benefit to enhancing the adhesive property of a film.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a room temperature self-crosslinking wood paint emulsion and a preparation method thereof. Background technique [0002] At present, the development trend of water-based wood lacquers is environmental protection and high performance. With the increasingly stringent national environmental protection regulations, water-based wood lacquers will gradually replace solvent-based wood lacquers. However, my country's water-based wood coatings still have limitations in key technologies, resulting in a certain gap between their paint films and solvent-based coatings in terms of hardness, water resistance, and stability. The most widely used acrylate emulsion in water-based wood lacquers is "hot sticky and cold brittle" due to its low cross-linking density. During use, it is easy to scratch, bruise, crack, foam, wrinkle or even fall off. The fundamental reason is that acrylate emulsion is...

Claims

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Application Information

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IPC IPC(8): C09D125/14C09D133/08C08F212/08C08F212/14C08F220/14C08F220/18C08F220/32C08F220/06C08F220/58
Inventor 郭玉朱强刘志刚刘顺
Owner 上海展辰涂料有限公司
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