High solid content latent curing polyurethane acroleic acid hybrid emulsion

Abstract

The invention relates to a method for preparing a high solid content latent cured polyurethane acrylic acid heterozygous latex and an application thereof. The preparation method comprises the following steps: pre-polymerizing polyester polyalcohol, hydrophilic chain extender and diisocyanate monomer to obtain the polyurethane prepolymer containing a hydrophilic group (carboxyl or sulfo group) and a terminal NCO group; then, neutralizing the polymer into salt and dispersing the salt in water to prepare the polyurethane water dispersoid; finally, using the dispersoid as macro molecular emulsifying agent and reactant to emulsify and disperse the acrylic ester monomer, initiating the polymerization by heating, dropping initiator to perform the latex polymerization, and regulating the pH of the latex by adding a latent curing agent to obtain the high solid content latent cured polyurethane acrylic acid heterozygous latex. The high solid content latent cured polyurethane acrylic acid heterozygous latex has a solid content of above 45%; the storage of the high solid content latent cured polyurethane acrylic acid heterozygous latex is stable; and high hardness film coating can be formed at the room temperature. Compared with acrylic acid latex and polyurethane latex, the high solid content latent cured polyurethane acrylic acid heterozygous latex has better film forming performance, water resistance, alcohol resistance, pollution resistance, dry / wet cleaning resistance and chemical solvent resistance, as well as high hardness.

Description

technical field

[0001] The present invention relates to high solid content latent curing polyurethane acrylic hybrid emulsions. technical background

[0002] With the emergence of resource and energy crises and the continuous enhancement of people's awareness of environment and health, water-based wood coatings are increasingly valued. Existing water-based wood coatings include wood coatings such as polyacrylate (PA) emulsions, polyurethane (PU) aqueous dispersions and acrylic polyurethane composite (PUA) emulsions. PU emulsion coating has excellent solvent resistance, abrasion resistance, scratch resistance, good flexibility and elasticity, etc., but it is not as good in stability, self-thickening, solid content, gloss, cost, etc. Satisfactory; PA emulsion coating has the advantages of high hardness, good weather resistance and appearance, and relatively low cost, but poor flexibility, abrasion resistance, and chemical resistance. The PUA emulsion combines the two emulsio...

Examples

Embodiment 1

[0051] The latent curing polyurethane acrylic hybrid emulsion with high solid content is used, and its formulation components are listed in Table 2.

[0052] Table 2 High solid content latent curing polyurethane acrylic hybrid emulsion

[0053]

[0054] Under the protection of dry nitrogen, the dehydrated polyether glycol N210, N220, BDO and DMPA are added to a 1000ml four-necked flask equipped with a thermometer, a stirring device and a reflux condenser, a small amount of N-methylpyrrolidone is added, and the temperature is raised to Stirring was started at 60°C, and TDI was added dropwise when the reaction system became transparent, and the drop was completed in 1 hour. React at 70°C-80°C for 3-5 hours, and use n-butylamine titration method to determine the end point of the reaction. After reaching the end point, cool down to 40°C, add triethylamine to neutralize, add acetone to dilute, emulsify in normal temperature water, and use ethylenediamine to extend the chain to ...

Embodiment 2

[0057] Using the high-solid-content latent-curing polyurethane-acrylic hybrid emulsion prepared in Example 1, the wood coating formulation was prepared as shown in Table 3.

[0058] Table 3 Waterborne Wood Coating Formulation

[0059] serial number composition Mass percentage, % 1 PUA emulsion in example 1 88 2 Deionized water 8.1 3 Coalescing agent (dipropylene glycol butyl ether) 3.0

[0060] 4 Wetting agent (TEGO-245) 0.2 5 Defoamer (TEGO—805) 0.05 6 Leveling agent (BYK-330) 0.1 7 Thickener (RM2020) 0.15 8 pH adjuster (AMP-95) 0.20 9 antifungal agent 0.20 total 100

[0061] The preparation method is as follows: firstly add raw materials No. 2-9 into the stirring tank, disperse with a high-speed disperser for 10-30 minutes, then slowly add the PUA emulsion into the stirring tank, stir at a medium speed for 30-60 minutes, and use AMP-95 Adjust the pH value of the coating, and wh...

example 3

[0063] Polyester diol and aliphatic diisocyanate were used to prepare latently cured polyurethane-acrylic hybrid emulsion with high solid content. The raw materials used are listed in Table 4.

[0064] Table 4 High solid content latent curing polyurethane acrylic hybrid emulsion

[0065]

[0066]

[0067] Under the protection of dry nitrogen, the dehydrated polyether glycol N210, T1136, BDO and DMPA were added to a 1000ml four-necked flask equipped with a thermometer, a stirring device and a reflux condenser, a small amount of N-methylpyrrolidone was added, and the temperature was raised Stir at 60°C, start to add IPDI dropwise when the reaction system becomes transparent, finish dropping in 1 hour, then add catalyst, react at 70°C-80°C for 3-5 hours, use n-butylamine titration method to judge the reaction end point. After reaching the end point, cool down to 40°C, add triethylamine to neutralize, add acetone to dilute, emulsify in normal temperature water, and use ethyl...

technical field

[0001] The present invention relates to high solid content latent curing polyurethane acrylic hybrid emulsions. technical background

[0002] With the emergence of resource and energy crises and the continuous enhancement of people's awareness of environment and health, water-based wood coatings are increasingly valued. Existing water-based wood coatings include wood coatings such as polyacrylate (PA) emulsions, polyurethane (PU) aqueous dispersions and acrylic polyurethane composite (PUA) emulsions. PU emulsion coating has excellent solvent resistance, abrasion resistance, scratch resistance, good flexibility and elasticity, etc., but it is not as good in stability, self-thickening, solid content, gloss, cost, etc. Satisfactory; PA emulsion coating has the advantages of high hardness, good weather resistance and appearance, and relatively low cost, but poor flexibility, abrasion resistance, and chemical resistance. The PUA emulsion combines the two emulsio...

Examples

Embodiment 1

[0051] The latent curing polyurethane acrylic hybrid emulsion with high solid content is used, and its formulation components are listed in Table 2.

[0052] Table 2 High solid content latent curing polyurethane acrylic hybrid emulsion

[0053]

[0054] Under the protection of dry nitrogen, the dehydrated polyether glycol N210, N220, BDO and DMPA are added to a 1000ml four-necked flask equipped with a thermometer, a stirring device and a reflux condenser, a small amount of N-methylpyrrolidone is added, and the temperature is raised to Stirring was started at 60°C, and TDI was added dropwise when the reaction system became transparent, and the drop was completed in 1 hour. React at 70°C-80°C for 3-5 hours, and use n-butylamine titration method to determine the end point of the reaction. After reaching the end point, cool down to 40°C, add triethylamine to neutralize, add acetone to dilute, emulsify in normal temperature water, and use ethylenediamine to extend the chain to ...

Embodiment 2

[0057] Using the high-solid-content latent-curing polyurethane-acrylic hybrid emulsion prepared in Example 1, the wood coating formulation was prepared as shown in Table 3.

[0058] Table 3 Waterborne Wood Coating Formulation

[0059] serial number composition Mass percentage, % 1 PUA emulsion in example 1 88 2 Deionized water 8.1 3 Coalescing agent (dipropylene glycol butyl ether) 3.0

[0060] 4 Wetting agent (TEGO-245) 0.2 5 Defoamer (TEGO—805) 0.05 6 Leveling agent (BYK-330) 0.1 7 Thickener (RM2020) 0.15 8 pH adjuster (AMP-95) 0.20 9 antifungal agent 0.20 total 100

[0061] The preparation method is as follows: firstly add raw materials No. 2-9 into the stirring tank, disperse with a high-speed disperser for 10-30 minutes, then slowly add the PUA emulsion into the stirring tank, stir at a medium speed for 30-60 minutes, and use AMP-95 Adjust the pH value of the coating, and wh...

example 3

[0063] Polyester diol and aliphatic diisocyanate were used to prepare latently cured polyurethane-acrylic hybrid emulsion with high solid content. The raw materials used are listed in Table 4.

[0064] Table 4 High solid content latent curing polyurethane acrylic hybrid emulsion

[0065]

[0066]

[0067] Under the protection of dry nitrogen, the dehydrated polyether glycol N210, T1136, BDO and DMPA were added to a 1000ml four-necked flask equipped with a thermometer, a stirring device and a reflux condenser, a small amount of N-methylpyrrolidone was added, and the temperature was raised Stir at 60°C, start to add IPDI dropwise when the reaction system becomes transparent, finish dropping in 1 hour, then add catalyst, react at 70°C-80°C for 3-5 hours, use n-butylamine titration method to judge the reaction end point. After reaching the end point, cool down to 40°C, add triethylamine to neutralize, add acetone to dilute, emulsify in normal temperature water, and use ethyl...

Images