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Biodegradable aqueous emulsion-type polylactic acid adhesive and its preparation method

A biodegradable, water-emulsion-type technology, applied in the direction of adhesives, graft polymer adhesives, adhesive types, etc., can solve the problems of unsuitability and no research reports on polylactic acid-based water-emulsion adhesives, etc. The effect of improved hydrophilic performance, stable hardness and other physical and chemical indicators, and good adhesion performance

Active Publication Date: 2013-09-25
长沙乐远化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this invention is that there are residues of organic solvents and isocyanate monomers. Since organic solvents are flammable and explosive, and residual isocyanate monomers are carcinogens, this type of adhesive is not suitable for cigarette filter materials, food contact materials and hygienic materials. Bonding of materials
At present, the research on the development and application of polylactic acid-based adhesives mainly focuses on solvent-based adhesives and hot-melt adhesives, and there is no research report on polylactic acid-based water-emulsion adhesives.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Add 40 parts of deionized water in the formula into the reaction kettle, stir at 60 rpm, heat to 55°C-60°C, and keep the temperature, add 3 parts of 1,2 propylene glycol, 5 parts of ethylene-vinyl acetate The copolymer emulsion (VAE emulsion) was stirred evenly for about 30 minutes.

[0042] Continue to add 15 parts of vinyl acetate grafted starch with a graft rate of 2.5%-4% (w / w) in the reactor while maintaining the temperature at 55°C-60°C, increase the speed to 120 rpm and stir for 60 minutes, After taking a sample and observing that the vinyl acetate grafted starch is completely gelatinized, continue to add 30 parts of polyethylene glycol grafted polylactic acid copolymers (polyethylene glycol units account for 5%-10% of the total weight of the copolymer) and stir and emulsify for 45 minutes , and then add 0.05 parts of polydimethylsiloxane emulsion defoamer (provided by BYK Chemical Co., Ltd., Germany), and the remaining 6.95 parts of water. A water-emulsion type...

Embodiment 2

[0045] Add 40 parts of deionized water in the formula into the reaction kettle, the stirring speed is 80 rpm, after heating to 60°C-65°C, while maintaining the temperature, add 2 parts of 1,2 propylene glycol, 2 parts of ethylene-vinyl acetate The copolymer emulsion (VAE emulsion) was stirred evenly for about 30 minutes.

[0046] Continue to add 5 parts of vinyl acetate grafted starch with a graft rate of 1%-1.5% (w / w) in the reactor while maintaining the temperature at 60°C-65°C, increase the speed to 160 rpm and stir for 45 minutes, After taking a sample and observing that the vinyl acetate grafted starch is completely gelatinized, continue to add 42 parts of polyethylene glycol grafted polylactic acid copolymers (polyethylene glycol units account for 15%-25% of the total weight of the copolymer) and stir and emulsify for 60 minutes , then add 0.03 parts of acrylic acid-C 12-18 Alkyl acrylate copolymer defoamer (provided by BYK Chemical Co., Ltd., Germany), and the remainin...

Embodiment 3

[0049] Add 35 parts of deionized water in the formula into the reactor, the stirring speed is 70 rpm, and after heating to 60°C-65°C, add 3 parts of 1,2 propylene glycol, 20 parts of ethylene-vinyl acetate The copolymer emulsion (VAE emulsion) was stirred evenly for about 30 minutes.

[0050] Continue to add 20 parts of vinyl acetate grafted starch with a graft rate of 3%-4% (w / w) in the reactor while maintaining the temperature at 60°C-65°C, increase the speed to 160 rpm and stir for 60 minutes, After taking a sample and observing that the vinyl acetate grafted starch is completely gelatinized, continue to add 10 parts of polyethylene glycol grafted polylactic acid copolymers (polyethylene glycol units account for 5%-8% of the total weight of the copolymer) and stir and emulsify for 45 minutes , then add 0.05 parts of acrylic acid-C 12-18 Alkyl acrylate copolymer defoamer (provided by German BYK Chemical Co., Ltd.), and the remaining 11.95 parts of water are stirred evenly, ...

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Abstract

The invention relates to a biodegradable aqueous emulsion-type polylactic acid adhesive and its preparation method. As a water dispersible emulsion, every 100 parts by weight of the adhesive at least contains 5-45 parts by weight of a polyethylene glycol grafted polylactic acid copolymer, 5-40 parts by weight of vinyl acetate grafted starch, and 0.5-30 parts by weight of an ethylene-vinyl acetate copolymer. The aqueous emulsion-type polylactic acid adhesive provided in the invention is biodegradable, has high bonding fastness, adjustable filter rod hardness as well as good moulding performance, and simultaneously has filter rod adsorption enhancing and harm reduction performances.

Description

technical field [0001] The invention relates to a water-emulsion type adhesive used for forming cigarette filter tips, in particular to a biodegradable water-emulsion type polylactic acid adhesive used for forming polylactic acid tow or polypropylene tow filter tips. Background technique [0002] At present, the filter materials used in the tobacco industry are mainly cellulose diacetate tow and polypropylene tow, and the development of polylactic acid tow for cigarettes is emerging in recent years. Cellulose diacetate fibers are generally plasticized with triacetin plasticizer to bond filter rods. Polylactic acid cigarette tow is a partially crystalline polymer. Studies have shown that polylactic acid tow can be slightly plasticized by triacetin in the case of undrawn and low crystallinity after spinning. However, the undrawn polylactic acid tow is unstable in size during the subsequent crimping and drying process, and cannot guarantee a good and stable crimping state, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J167/04C09J151/02
Inventor 黄凯兵李伟王建罗涛
Owner 长沙乐远化工科技有限公司
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