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Biodegradable LA (lactide) oligomer bonding agent, and preparation method and purpose thereof

A biodegradable and adhesive technology, applied in adhesives and other directions, can solve the problems of water-based adhesives, such as poor water resistance and solvent-resistant film strength, not specifying the biodegradation rate of mixture adhesives, and rare adhesives. Controllable viscosity, low toxicity and high efficiency

Active Publication Date: 2017-09-19
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent is described as biodegradable, it does not specify what the biodegradation rate of the mixture adhesive is.
In addition, the performance of water-based adhesives such as water resistance, solvent resistance, and film strength is poor, and according to the analysis of the synthesis process, its cost is also high
[0004] In general, the development of simple to produce, easy to handle, low cost, biodegradable adhesives is still rare

Method used

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  • Biodegradable LA (lactide) oligomer bonding agent, and preparation method and purpose thereof
  • Biodegradable LA (lactide) oligomer bonding agent, and preparation method and purpose thereof
  • Biodegradable LA (lactide) oligomer bonding agent, and preparation method and purpose thereof

Examples

Experimental program
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Effect test

Embodiment 1～4

[0024] (1) LA chemical synthesis product preparation in the embodiment

[0025] Add ethyl acetate solution to the four reactors respectively, and then add LA powder in the proportion of 25% of the mass of the ethyl acetate solution. Under nitrogen protection, control the temperature at 60°C, and the stirring speed is 150r / min. LA is completely After dissolving, add 2.12g of stannous octoate, react for 2.5h, 4h, 6h, and 9h respectively, take out the reactant, purify and centrifuge with absolute ethanol, and obtain the LA chemical synthesis product.

[0026] (2) Performance characterization of LA chemical synthesis product in the embodiment

[0027] ①NMR test

[0028] The experimental conditions of nuclear magnetic resonance are that the solvent is heavy water and the internal standard tetramethylsilane. The quartet center of the methine group of PLA in the NMR diagram is at 5.2ppm, and the methyl shift peak is 1.5ppm, indicating that there are LA macromolecular products in th...

example 5～8

[0034] Dilute the LA chemically synthesized product obtained in Example 4 with ethyl acetate to obtain a biodegradable adhesive. According to the solid content of the solution, take a quantitative solution and apply it evenly on the kraft paper with a scraper, put it in an oven and bake it for 10 minutes, and the obtained glue content is 12mg / cm 2 pressure sensitive tape. Among them, the initial adhesion test adopts the inclined surface rolling ball method in the national standard GB / T4852-2002 (inclination angle of 30°, the length of the sample is more than 250mm, and the width is 10-80mm), and the maximum size of the steel ball that can be adhered to the viscous surface of the specified length is detected. The holding force test adopts the test method of the adhesive tape to the standard test steel plate in the national standard GB / T4851-2014 (the length of the sample is 150mm, and the width is 12±0.5mm), and the adhesive tape to the standard steel plate is measured by the f...

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Abstract

The invention relates to a biodegradable bonding agent material prepared from LA (lactide) chemical synthesis products. The LA materials are poured into a reaction container containing solvents according to the proportion of 5 to 50 percent of the mass of the solvents; a reactor has a stirring and control function; the reactor is controlled under the nitrogen gas protection condition; a certain reaction temperature is controlled; meanwhile, the stirring is performed; after the LA is completely fused, catalysts are added; after reacting for a period of time, stirring is stopped; after the materials are taken out, extraction and centrifugation are performed, so that the LA chemical synthesis products are obtained; then, the LA chemical synthesis products are dissolved by acetic ester, so that the biodegradable bonding agent is obtained. The bonding agent has the characteristics that the preparation is simple; the relative molecular weight and the viscosity are controllable; the biodegradable performance is realized. The biodegradable bonding agent material can be used in the fields of adhesive tapes, leather, sticking paper, stationery, office, electronics, automobile edge trimming fixation, shoe industry, handwork ornament pasting and fixation and the like.

Description

technical field [0001] The technology relates to the field of chemical materials, in particular to a biodegradable adhesive material prepared from a chemically synthesized product of lactide (LA) and a preparation method thereof. Background technique [0002] At present, there are many types of adhesives on the market, and they have played an extremely important role in various industries such as tapes, stationery, and handmade accessories. Although most products meet the requirements in terms of initial tack, stickiness, peel strength, etc., there are great hidden dangers in terms of environmental protection and safety. Because traditional adhesives are difficult to degrade in the natural environment, after being applied to plastics, leather, paper and other products, these products enter the environment after they are discarded, causing "pollution" due to the inability to degrade, which has become a major issue in the protection of the natural environment. Hidden dangers,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J167/04C08G63/08C08G63/85
CPCC08G63/08C08G63/823C08G63/85C09J167/04
Inventor 翁云宣张明慧张扬
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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