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Biodegradable adhesive and preparation method thereof

A biodegradable, adhesive technology, applied in the directions of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problem of no obvious change in molecular weight, achieve simple and easy preparation methods, improve residual adhesive properties, and synthesize Efficient effect

Active Publication Date: 2021-01-15
江苏美境新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Taking the common PLA as an example, under the condition of industrial composting (temperature 58±2°C, humidity 98% and certain microorganisms), the weight loss of PLA strips reaches 70% in about 50 days, and can be degraded within 3-6 months completely, but under simulated natural soil conditions, the weight loss of PLA splines after 1 year is only 0.23%, and there is basically no degradation; similarly, no matter whether PLA splines are placed in fresh water or in the ocean, after a year of After immersion, no significant weight loss was observed for PLA strips, and GPC test showed no significant change in molecular weight

Method used

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  • Biodegradable adhesive and preparation method thereof

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preparation example Construction

[0042] A biodegradable adhesive and a preparation method thereof, comprising the following steps:

[0043] Step 1: Under the action of a catalyst, carry out esterification and polycondensation reaction between lactic acid and its mixture and polyol compound at 140-220°C, and under the protection of nitrogen, evaporate most of the by-product water formed under normal pressure, and then Remove traces of water and excess polyol compounds under reduced pressure under vacuum until the acid value of the synthesized product is lower than 5mgKOH / g to obtain a polylactic acid copolymer polyol; the reaction time is 4-12h;

[0044] Step 2: Under the action of a catalyst, conduct esterification and polycondensation reactions between the polyacid compound and the polyol compound at 140-220°C, under the protection of nitrogen, evaporate most of the by-product water generated at normal pressure, and then vacuum Remove traces of water and excess polyol compounds under reduced pressure until t...

Embodiment 1

[0089] Step 1: 168.7g (1.5mol) mass concentration is 80% lactic acid, 15.2g (0.1mol) mass concentration is 50% glycolic acid, 10.4g (0.1mol) 3-hydroxybutyric acid, 6.8g (0.09mol ) 1,3-propanediol and 0.7g of stannous octoate were added to the reactor, and under the protection of nitrogen, the oil bath was heated to 170°C for 3 hours of reaction, then vacuumed, and the vacuum degree was gradually increased, and trace water and excess 1 , 3-propanediol, continue to react at 170°C for 2 hours to obtain a viscous polylactic acid copolymer polyol, and its molecular weight is 2178 according to GPC;

[0090] Step 2: 177g (1.5mol) of succinic acid, 120.8g (1.59mol) of 1,3-propanediol and 0.7g of stannous octoate were added to the reactor. Under the protection of nitrogen, the oil bath was heated to 175°C for 3 hours, and then pumped Vacuum, and gradually increase the vacuum degree, reduce the pressure to remove trace water and excess 1,3-propanediol, continue the reaction at 175 ° C f...

Embodiment 2

[0093] Step 1: 202.5g (1.8mol) mass concentration is 80% lactic acid, 15.2g (0.1mol) mass concentration is 50% glycolic acid, 31.2g (0.3mol) 3-hydroxybutyric acid, 6.8g (0.09mol) ) 1,3-propanediol, 4g polypropylene glycol 400 (0.01mol) and 0.8g stannous octoate were added to the reactor, and under the protection of nitrogen, the oil bath was heated to 180°C for 4 hours, and then vacuumed, and the vacuum degree was gradually increased. Remove traces of water and excess 1,3-propanediol under reduced pressure, and continue the reaction at 180°C for 3 hours to obtain a viscous polylactic acid copolymer polyol with a molecular weight of 2938 as measured by GPC;

[0094] Step 2: Add 118g (1mol) of succinic acid, 80.5g (1.06mol) of 1,3-propanediol and 0.6g of stannous octoate into the reactor. Vacuum, and gradually increase the degree of vacuum, decompress to remove traces of water and excess 1,3 propylene glycol, continue to react at 180°C for 2 hours, and obtain a viscous polyester...

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Abstract

The invention discloses a biodegradable adhesive and a preparation method thereof. The biodegradable adhesive comprises the following components in parts by weight: 1-95 parts of polylactic acid copolymer polyol, 5-95 parts of polyester polyol, 0.2-2 parts of a hydrolysis stabilizer, 1-45 parts of an inorganic filler, 0.5-2 parts of a thixotropic agent and 0-8 parts of a curing agent. The biodegradable adhesive prepared by the invention has good biodegradability and controllable relative molecular weight and viscosity, and can be used in the fields of surface adhesion of adhesive tapes, stationery, shoes industry, automotive upholstery, packing materials and other building or decorative materials and the like.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a biodegradable adhesive and a preparation method thereof. Background technique [0002] As the world pays more and more attention to environmental protection, especially my country takes the green economy as the main direction of future development, green environmental protection will become an inevitable trend in the development of all walks of life in the future. Adhesives, which have played a major role in all walks of life, must also face higher environmental protection requirements; traditional adhesives have the advantages of low cost and good adhesion, but they are difficult to degrade in the natural environment. The content of waste adhesives in nature will become higher and higher, and the pollution will become more and more serious, which has already affected the ecological environment and human health. Therefore, in the future, biodegradable and environmentally frie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J11/06C09J11/04C08G18/42
CPCC09J175/06C09J11/04C09J11/06C08G18/4238C08G18/4283C08G18/4202C08G2230/00C08L2201/06C08K2003/265C08K2003/2241C08K2003/0856C08L91/00C08K3/34C08K5/29C08K13/04C08K7/26C08K3/26C08K3/22C08K5/1515C08K13/02C08K3/346C08K7/08C08K3/08C08K5/353
Inventor 吴晓金李峰泉张鑫杰
Owner 江苏美境新材料有限公司
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