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Preparation of Polybutadiene Modified Polyurethane-Acrylic Emulsion

A technology of polybutadiene and acrylate, applied in the field of preparation of polymer materials, can solve the problems of low terminal double bond activity, low monomer conversion rate, large tendency to polymerize, etc., and achieves improved monomer conversion rate, mechanical The effect of high strength and reduced tendency to phase separation

Active Publication Date: 2018-01-05
阜阳市华轩睿创生产力促进中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the influence of the polyurethane chain segment on the terminal double bond, the activity of the terminal double bond is low, the tendency of polymerization between unsaturated monomers is large, and the resulting PUA copolymer is less, and the product actually contains a small amount of PUA copolymer, polyurethane and Polyacrylate mixture, poor compatibility between polymers
Moreover, the polyurethane-acrylic ester copolymer obtained by this method is a linear block copolymer, which has great shortcomings in water resistance and mechanical strength.
In addition, in the soap-free emulsion polymerization, because the monomer swells into the interior of the colloidal particles, the water-soluble initiator is used alone, the conversion rate of the monomer is low, and the amount of gel in the polymerization process is high

Method used

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  • Preparation of Polybutadiene Modified Polyurethane-Acrylic Emulsion

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Experimental program
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Embodiment 1

[0029] Embodiment 1: the preparation of polybutadiene modified polyurethane-acrylate emulsion

[0030] Under the protection of N2, in a reaction vessel with a reflux condenser and a thermometer, add 57g of isophorone diisocyanate (IPDI), polybutylene adipate whose hydroxyl value after vacuum dehydration is equal to 55mgKOH / g 50g each of diol (PBA) and hydroxyl-terminated polybutadiene (HTPB), react at a constant temperature of 90°C for 1.5h under mechanical stirring; cool down to 50°C, add 8.5g of dimethylolpropionic acid (DMPA), shrink Diethylene glycol (DEG) 6.2g, 3 drops of dibutyltin dilaurate (T-12) and 1 drop of stannous octoate (T-9), styrene 15g, butyl acrylate 5g, continue the reaction at 75°C for 3 h, add 15 g of methyl methacrylate (MMA) and 5 g of butyl acrylate (BA) dissolved in 0.05 g of azobisisobutyronitrile (AIBN), stir evenly, and add triethylamine 6.4 under high shear force After neutralizing g for 1 min, add 250 g of deionized water below 15°C and 50 g of ...

Embodiment 2

[0032] Embodiment 2: the preparation of polybutadiene modified polyurethane-acrylate emulsion

[0033]Under the protection of N2, in a reaction vessel with a reflux condenser and a thermometer, add 45 g of isophorone diisocyanate (IPDI), and hydroxyl-terminated polybutadiene (HTPB) with a hydroxyl value equal to 110 mgKOH / g after vacuum dehydration ) 80g, reacted at a constant temperature of 85°C for 2h under mechanical stirring; cooled down to 50°C, added 8.5g of dimethylolpropionic acid (DMPA), 3 drops of dibutyltin dilaurate (T-12) and 1 drop of suboctanoic acid Tin (T-9), 15g of styrene, 5g of butyl acrylate, continue to react at 70°C for 3.5h, cool down, add 5g of methyl methacrylate (MMA) dissolved in 0.05g of azobisisobutyronitrile (AIBN), Butyl acrylate (BA) 15g, stir evenly, add 7.4g triethylamine under high shear force for neutralization for 1min, then add 250g deionized water below 15℃ successively under high speed stirring, dissolve 12.8g Isophor 50g of aqueous so...

Embodiment 3

[0035] Embodiment 3: the preparation of polybutadiene modified polyurethane-acrylate emulsion

[0036] Under the protection of N2, in a reaction vessel with a reflux condenser and a thermometer, add 78g of dicyclohexylmethane diisocyanate (HMDI), polycaprolactone diol (PCL) whose hydroxyl value after vacuum dehydration is equal to 110mgKOH / g ) 50g, 20g of hydroxyl-terminated polybutadiene (HTPB) with a hydroxyl value equal to 55mgKOH / g, react at a constant temperature of 90°C for 1.5h under mechanical stirring; cool down to 50°C, add 7.2g of dimethylolbutyric acid (DMBA) , 6.5g of 1,4-butanediol (BDO), 3 drops of dibutyltin dilaurate (T-12), 15g of styrene, 5g of butyl acrylate, the temperature was raised to 65°C and the reaction was continued for 3.5h, and 0.05 g Benzoyl peroxide (BPO) styrene 15g, stir evenly, add 6.4g triethylamine under high shear force for neutralization for 1min, then add 250g deionized water below 15℃ under high speed stirring, dissolve 50g of aqueous ...

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Abstract

The invention discloses a preparation method of polybutadiene-modified polyurethane-acrylate emulsion, which belongs to the technical field of polymer material preparation. Prepolymerize isocyanate and polyol chain extender, then add unsaturated monomer dissolved in initiator to reduce the viscosity of the system, add water to emulsify, and then extend the chain to obtain polybutadiene modified polybutadiene containing unsaturated monomer and oil-soluble initiator Polybutadiene-modified polyurethane-acrylate emulsion was prepared by in-situ soap-free emulsion polymerization. The emulsion obtained by the present invention has the advantages of good stability, high solid content, low VOC content, less gel amount, etc. The material made from the emulsion has high compatibility, good low temperature resistance and water resistance, and is suitable for nonpolar groups Strong material adhesion, can be widely used in coatings, leather finishing agents, adhesives and other fields.

Description

technical field [0001] The invention relates to the technical field of preparation of polymer materials, in particular to a preparation method of polybutadiene-modified polyurethane-acrylate emulsion. Background technique [0002] Polyurethane-acrylate emulsion (PUA) is prepared by chemical copolymerization or physical blending of polyurethane (PU) and polyacrylate (PA), because it has excellent wear resistance, toughness and adhesion of polyurethane It is known as "the third generation of water-based polyurethane" because of its mechanical strength and good weather resistance of acrylate. At present, most of the PUA emulsions prepared by chemical copolymerization are first synthesized vinyl-terminated PU emulsions, and then use the PU emulsions as seeds to carry out acrylate seed emulsion polymerization. For example, Yang Jianjun of Anhui University and others used hydroxypropyl methacrylate (HPMA)-terminated polyurethane (PU) emulsion as the seed emulsion, ammonium persul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/00C08F212/08C08F220/18C08F220/14C08F2/22C08G18/75C08G18/42C08G18/62
Inventor 高明志金少杰
Owner 阜阳市华轩睿创生产力促进中心有限公司