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Method for preparing polyurethane/polyacrylate core-shell emulsion

A polyacrylate, core-shell emulsion technology, applied in the direction of graft polymer adhesive, adhesive type, fiber treatment, etc. Water resistance can be designed, rheological properties can be designed

Inactive Publication Date: 2012-09-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the physical blending used in this patent, the film of the obtained composite emulsion is only partially connected with the polyurethane latex particles and the polyacrylate latex particles, the degree of phase separation is relatively large, and the transparency and mechanical properties of the film are very poor. An emulsifier must be used in the copolymer emulsion, so the water resistance of the emulsion film is poor compared to this patent
U.S. Patents (US 6063861 and US 6197874) and Yu Haishen et al. (Chemical World, 2009 (3): 149-152) all disclose the emulsion polymerization of acrylate with water-based polyurethane emulsion as the seed to prepare polyurethane / polyacrylic acid ester compound emulsion, but because all three are used: adding acrylate to polyurethane emulsion to swell it into polyurethane latex particles for free radical polymerization, and requires multiple swelling, multiple polymerization, multiple cooling and other processes, it belongs to Typical multi-step seed polymerization process, so the process is cumbersome and the operation is very inconvenient
At the same time, in these three publications, carboxylates with poor emulsifying properties and large amounts are used as self-emulsifying components, which cause the emulsion to be unstable in an environment with a low pH value, so the above method cannot add acidic acrylic monomers. , which limits the designability of the emulsion

Method used

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  • Method for preparing polyurethane/polyacrylate core-shell emulsion
  • Method for preparing polyurethane/polyacrylate core-shell emulsion
  • Method for preparing polyurethane/polyacrylate core-shell emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Synthesis of polyester polyols containing sulfonate groups

[0038] Add 304.78g of 1,6-hexanediol and 46.22g of isophthalic acid-5-sodium sulfonate (5-SSIPA) into the 2 In the four-necked flask with conduit, thermometer, mechanical stirring and reflux condenser, heat up to 210°C and reflux for 30 minutes, then cool down to 70°C, add 252.96g of adipic acid and 3.01g of dibutyltin dilaurate, change the distillation device at 160°C After heating for 30 minutes, heat at 180° C. for 30 minutes, react at 210° C. for 1 hour, and finally distill under reduced pressure at 10 mmHg to stop the reaction. The material is discharged and stored dry. The product obtained was a clear liquid at high temperature and a white waxy solid at room temperature.

[0039] According to HGT 2708-1995, the acid value of polyester polyol products containing sulfonate groups is 0.79mgKOH / g;

[0040] According to HGT 2709-1995, the hydroxyl value of the polyester polyol product containing sulfonat...

Embodiment 2

[0046] 1) the synthesis of polyester polyol containing sulfonate group is the same as in Example 1

[0047] 2) the preparation of aqueous polyurethane emulsion is the same as embodiment 1

[0048] 3) Preparation of polyurethane / polyacrylate core-shell emulsion

[0049] Add 78.95g of the WPU emulsion prepared in step 2) to a 500mL four-neck flask with nitrogen, a thermometer, and mechanical stirring, and raise the temperature to 80°C, then add 20.20g of MMA, 25.85g of BA, and 0.92g of AA dropwise to it with a constant pressure funnel. The aqueous solution of monomer and KPS (0.28g dissolved in 30g deionized water) was dripped within 2-3 hours, and kept at 80°C for 1 hour. After cooling, it was filtered and discharged to obtain a light blue emulsion: PUA-2.

Embodiment 3

[0051] 1) the synthesis of polyester polyol containing sulfonate group is the same as in Example 1

[0052] 2) Preparation of water-based polyurethane emulsion

[0053] The product of 65.91g step 1) is added into the 2 In the four-necked flask with catheter, thermometer, mechanical stirring and reflux condenser, raise the temperature to 120°C and wait for it to melt, then distill under reduced pressure at 10mmHg for 0.5h to remove water, then cool down to 80°C, add 0.37g of dibutyltin dilaurate, and stir After uniformity, add 10.89gIPDI, react at 60°C for 3h, add 13.16gMMA and 16.84gBA monomer to reduce the viscosity as the viscosity of the polyurethane prepolymer increases, and then add the polyurethane prepolymer into the aqueous solution of ethylenediamine (0.46 g ethylenediamine was dissolved in 288.58g deionized water) and dispersed for 2h to obtain a white emulsion.

[0054] 3) Preparation of polyurethane / polyacrylate core-shell emulsion

[0055] Add 132g of the WPU e...

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Abstract

The invention provides a method for making polyacrylate / polyurethane composite emulsion in which polyacrylate is taken as a core and polyurethane is taken as a shell. The method comprises a method for making sulfonate-containing polyester polyol, and a method for preparing sulfonate type polyurethane seed emulsion. The polyacrylate / polyurethane core-shell composite emulsion prepared by the method has an excellent high-speed coating levelling property, has excellent bonding strength on base materials with low surface tension such as plastic films and vacuum aluminum-plated films, and is high in drying speed. The emulsion is applicable to binders for water-based plastic printing ink, water-based plastic complex film adhesives, water-based varnish, film-forming substances of soft finishing coatings of textiles and the like.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane / polyacrylate composite emulsion (PUA) with polyurethane as the shell and polyacrylate or acrylate / styrene copolymer as the core. [0002] The morphology of the latex particles of the PUA emulsion obtained by the present invention, the hydrophilicity and hardness of the core polymer and the shell polymer can be designed arbitrarily, so that the rheological properties and water resistance of the emulsion can be designed, and because the shell The layer polymer is polyurethane, and the final dry film has more polyurethane characteristics, so it can be widely used for bonding low surface tension substrates, such as water-based plastic laminating adhesive, non-woven fabric and PVC composite adhesive , Fabric soft finishing, leather finishing agent, printing ink binder, plastic absorbing plastic, water-based varnish, industrial anti-coating and other fields. Background technique [0003] Polyur...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08G18/46C08G63/688D06M15/21C09J151/08
Inventor 夏宇正王昊石淑先
Owner BEIJING UNIV OF CHEM TECH
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