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Modified polylactic acid adhesive and preparation method thereof

A polylactic acid and adhesive technology, applied in the field of material chemistry, can solve the problems of the influence of blended materials, thermodynamic incompatibility, low fracture strength between interfaces, etc., and achieve good mechanical properties and physical properties, good thermodynamic compatibility, The effect of high breaking strength

Inactive Publication Date: 2017-09-29
苏州奥宇包装科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polylactic acid and starch are thermodynamically incompatible, resulting in very low fracture strength at the interface, which has an important impact on the properties of blended materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A modified polylactic acid adhesive, in parts by weight, the adhesive comprises the following components: 13 parts of starch, 8 parts of maleic anhydride, 3 parts of polyethylene glycol, 8 parts of nano calcium carbonate, 3 parts of sodium hydroxide 8 parts, 8 parts of hydroxymethyl cellulose, 1 part of dispersant, 3 parts of defoamer, 8 parts of L-lactide monomer, 22 parts of polylactic acid.

[0019] The preparation method of described a kind of modified polylactic acid adhesive, comprises the following steps:

[0020] (1) Dissolve the starch in toluene, heat up to 35°C, add maleic anhydride while stirring, mix well, and then keep it in a constant temperature water bath at 70°C, and let stand for 30 minutes;

[0021] (2) Place the treated product of step (1) in an oven to dry, and grind it into powder, and then place it in a vacuum oven to dry for 1 hour, wherein the degree of vacuum is -0.2Pa, and the temperature is 70°C;

[0022] (3) Mix hydroxymethyl cellulose, po...

Embodiment 2

[0025] A modified polylactic acid adhesive, in parts by weight, the adhesive comprises the following components: 22 parts of starch, 15 parts of maleic anhydride, 12 parts of polyethylene glycol, 15 parts of nano calcium carbonate, 8 parts of sodium hydroxide parts, 14 parts of hydroxymethyl cellulose, 3 parts of dispersant, 6 parts of defoamer, 13 parts of L-lactide monomer, and 40 parts of polylactic acid.

[0026] The preparation method of described a kind of modified polylactic acid adhesive, comprises the following steps:

[0027] (1) Dissolve the starch in toluene, raise the temperature to 48°C, add maleic anhydride while stirring, mix well, and then set aside in a constant temperature water bath at 75°C for 42 minutes;

[0028] (2) Place the treated product of step (1) in an oven to dry, and grind it into powder, then place it in a vacuum drying oven for 2 hours, wherein the degree of vacuum is -0.2PaPa, and the temperature is 82°C;

[0029] (3) Mix hydroxymethyl cellu...

Embodiment 3

[0032] A modified polylactic acid adhesive, in parts by weight, the adhesive comprises the following components: 26 parts of starch, 20 parts of maleic anhydride, 15 parts of polyethylene glycol, 19 parts of nano calcium carbonate, 11 parts of sodium hydroxide parts, 19 parts of hydroxymethylcellulose, 5 parts of dispersant, 8 parts of defoamer, 16 parts of L-lactide monomer, and 45 parts of polylactic acid.

[0033] The preparation method of described a kind of modified polylactic acid adhesive, comprises the following steps:

[0034] (1) Dissolve the starch in toluene, raise the temperature to 55°C, add maleic anhydride while stirring, mix well, and then set aside in a constant temperature water bath at 80°C for 50 minutes;

[0035] (2) Place the treated product of step (1) in an oven to dry, and grind it into powder, then place it in a vacuum oven and dry it for 3 hours, wherein the degree of vacuum is -0.1Pa, and the temperature is 85°C;

[0036] (3) Mix hydroxymethyl cel...

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PUM

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Abstract

The invention discloses a modified polylactic acid adhesive and a preparation method thereof. The modified polylactic acid adhesive comprises the following components in parts by weight: 13-26 parts of starch, 8-20 parts of maleic anhydride, 3-15 parts of polyethylene glycol, 8-19 parts of nano calcium carbonate, 3-11 parts of sodium hydroxide, 8-19 parts of hydroxymethyl cellulose, 1-5 parts of a dispersing agent, 3-8 parts of a defoaming agent, 8-16 parts of an L-lactide monomer and 22-45 parts of polylactic acid. Firstly, the starch in the modified polylactic acid adhesive is good in thermodynamic compatibility with polylactic acid, so that the breaking strength of interfaces is relatively high; and secondly, the adhesive disclosed by the invention is high in plasticity and good in mechanical property and physical property.

Description

technical field [0001] The invention belongs to the field of material chemistry and relates to an adhesive, in particular to a modified polylactic acid adhesive and a preparation method thereof. Background technique [0002] Adhesives are one of the important components of coating formulations. The selection of adhesives directly affects the bonding strength between pigment particles and between pigments and base paper, and at the same time has a major impact on the rheological properties of coatings and the properties of coated paper. Commonly used coating adhesives can be divided into natural adhesives such as starch, casein and synthetic adhesives such as styrene-butadiene latex and polyvinyl alcohol. As an adhesive, starch has made a great contribution to paper coating, but because of its high viscosity, poor fluidity, low plasticity, poor stability and other shortcomings, it can no longer meet the needs of today's coating industry to develop higher coating solid content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J167/04C09J103/06C09J103/04C09J101/28C09J11/04C09J11/08
CPCC08K2003/265C08K2201/011C08L2205/035C09J11/04C09J11/08C09J167/04C08L3/06C08L3/04C08L71/02C08L1/284C08K3/26C08K3/22
Inventor 顾建芳
Owner 苏州奥宇包装科技有限公司
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