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Low-molding-temperature waterborne polyurethane adhesive and preparation method thereof

A technology of water-based polyurethane and molding temperature, applied in polyurea/polyurethane adhesives, adhesives, polymer adhesive additives, etc., can solve the problems of low use temperature, high energy consumption, high use temperature, etc., and achieve improved initial tack , Guarantee the initial bonding strength and improve the effect of bonding strength

Active Publication Date: 2014-09-10
重庆中科力泰高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But at present, in the field of automotive interior adhesives, water-based polyurethane adhesives for automotive roofs have shortcomings such as high operating temperature and high energy consumption, which limit their application. At present, the market urgently needs a product with low operating temperature, high bonding strength, and zero VOC. To meet the development needs of the car roof

Method used

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  • Low-molding-temperature waterborne polyurethane adhesive and preparation method thereof
  • Low-molding-temperature waterborne polyurethane adhesive and preparation method thereof
  • Low-molding-temperature waterborne polyurethane adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The aqueous polyurethane emulsion of low activation temperature mainly consists of the following components in parts by weight:

[0047] Polyol: phthalic anhydride polyester polyol (PD-56LV): 50 parts, polyoxypropylene glycol (GE-210): 25 parts;

[0048] Diisocyanate: toluene diisocyanate: 20 parts;

[0049] Small molecule alcohol chain extender: diethylene glycol: 1 part;

[0050] Catalyst: organotin dilaurate: 0.01 part;

[0051] Hydrophilic chain extender: sodium ethylenediamine sulfonate: 3.2 parts;

[0052] The preparation method is specifically:

[0053] Dehydrate the polyol in vacuum at 95°C-110°C, under the protection of dry inert gas, cool the dehydrated polyol to 60-70°C, add diisocyanate, react for 0.5-1 hour, add 0.5- Acetone 1.0 times the weight of the prepolymer, reduce the viscosity of the prepolymer, add a small molecule alcohol chain extender and catalyst, keep the temperature at 60-65°C for 2-4 hours, cool down to 45-55°C, add a hydrophilic chain e...

Embodiment 2-5

[0055] In Examples 2-5, the components and parts by weight of the water-based polyurethane emulsion with low activation temperature were added according to the data shown in Table 1, and the preparation method was the same as in Example 1.

[0056] The activation temperatures of the products prepared in Examples 1-5 were detected respectively, and the results are shown in Table 1.

[0057] Activation temperature test method: brush the glue on the medium density board, put it in a constant temperature oven at 60 ℃ and dry it for 2 minutes, take it out and let it air for 2 minutes at room temperature, then stick it with polyvinyl chloride film (PVC), press and stick it on a hot press Molding pressure setting: 0.2 MPa, molding time 30 seconds, molding temperature adjustable, polyvinyl chloride film (PVC) and MDF completely bonded to cause cohesive damage or material damage is regarded as activation, the molding temperature at this time is is the activation temperature.

[0058] ...

Embodiment 6

[0062] The low molding temperature water-based polyurethane adhesive mainly consists of the following components in parts by weight:

[0063] 50 parts of aqueous polyurethane emulsions of the low activation temperature prepared in embodiment 1;

[0064] Aqueous polyurethane dispersion: Bayer U54 (activation temperature at 53±5°C): 25 parts;

[0065] Vinyl acetate-ethylene copolymer emulsion: DA-102: 20 parts;

[0066] Acrylic emulsion: BASF Acronal A420S: 10 parts;

[0067] Tackifying resin: Eastman Tacolyn 3509: 1 part;

[0068] Flame retardant: trimethyl phosphate: 1 part;

[0069] Thickener: BYK420: 0.2 parts.

[0070] The preparation method is specifically:

[0071] At room temperature, stir the vinyl acetate-ethylene copolymer emulsion at a speed of 300-800 rpm, add triethanolamine pH regulator to adjust the pH of the vinyl acetate-ethylene copolymer emulsion to 7.8±1, add water-based polyurethane with low activation temperature Emulsion, polyurethane aqueous disper...

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Abstract

The invention discloses a low-molding-temperature waterborne polyurethane adhesive and a preparation method thereof. The low-molding-temperature waterborne polyurethane adhesive is prepared by matching a waterborne polyurethane dispersion, ethylene-vinyl acetate (EVA) emulsion, acrylic emulsion and the like based on low-activation-temperature waterborne polyurethane emulsion, wherein the low-activation-temperature waterborne polyurethane emulsion mainly consists of polyhydric alcohols, diisocyanate, a small molecule alcohol chain extender, a catalyst and a hydrophilic chain extender and has the activation temperature of less than 25 DEG C; the low-molding-temperature waterborne polyurethane adhesive prepared based on the low-activation-temperature waterborne polyurethane emulsion has the activation temperature of 30-60 DEG C, is high in bonding strength, is water-based emulsion, does not contain organic solvents or volatile organic compounds, is green and environment-friendly and can well meet the service requirements of adhesives for automobile roofs. The low-molding-temperature waterborne polyurethane adhesive also can be matched with a certain amount of enhancers, the bonding strength of colloid at the later stage is effectively improved, and the heat resistance of the roof at the later molding stage is guaranteed.

Description

technical field [0001] The invention belongs to the field of automobile interior decoration adhesives, and relates to a low-molding-temperature water-based polyurethane adhesive mainly used in automobile ceilings and a preparation method thereof. Background technique [0002] With the development of industry, the application market of adhesives is becoming more and more extensive, and the varieties are also increasing. Adhesives for automotive roofs mainly include two-component solvent-based polyurethane adhesives, two-component solvent-free polyurethane adhesives and hot-melt adhesives. Among them, two-component solvent-based polyurethane adhesives contain a large amount of organic solvents to pollute the environment, and VOC residues in the bonding parts; two-component solvent-free polyurethane adhesives do not contain organic solvents, are green and environmentally friendly, and have high bonding strength, but the viscosity of the colloid is large. Glue is applied by rol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C09J175/04C09J123/08C09J133/00C09J11/06C09J11/08C08G18/66C08G18/48C08G18/42C08G18/32
Inventor 李有刚冉忠祥徐林蒋乔波
Owner 重庆中科力泰高分子材料有限公司
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