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Thermochemical modified starch, preparation method and method for preparing adhesive by using thermochemical modified starch

A thermochemical and adhesive technology, applied in the direction of starch-derived adhesives, adhesive additives, adhesive types, etc., can solve problems such as high transportation costs, unsatisfactory water resistance, and complicated starch modification processes, and achieve Low transportation cost, excellent bonding strength and bonding water resistance, and high transportation efficiency

Active Publication Date: 2017-09-29
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of unsatisfactory water resistance, high transportation cost and complicated starch modification process of existing starch adhesives, and provide a thermochemically modified starch, preparation method and application of thermochemically modified starch Method of preparing adhesive

Method used

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  • Thermochemical modified starch, preparation method and method for preparing adhesive by using thermochemical modified starch
  • Thermochemical modified starch, preparation method and method for preparing adhesive by using thermochemical modified starch
  • Thermochemical modified starch, preparation method and method for preparing adhesive by using thermochemical modified starch

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specific Embodiment approach 1

[0034] Specific embodiment 1: In this embodiment, thermochemically modified starch is uniformly sprayed into 100 parts of starch by weight parts of 10-70 parts of acid solution, and after mixing evenly, heat treatment is carried out at 70°C-110°C for 30-210 minutes , dried, cooled, and then crushed.

specific Embodiment approach 2

[0035] Embodiment 2: This embodiment differs from Embodiment 1 in that the starch is one or a mixture of corn starch, wheat starch, potato starch, tapioca starch and sweet potato starch. Others are the same as in the first embodiment.

[0036] When the starch described in this embodiment is a mixture, the ratio between the components is arbitrary.

specific Embodiment approach 3

[0037] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the mass concentration of the acid solution is 1% to 20%. Others are the same as those in the first or second embodiment.

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Abstract

The invention discloses thermochemical modified starch, a preparation method and a method for preparing an adhesive by using the thermochemical modified starch and relates to modified starch and adhesives prepared by using the starch. The method is used for solving the technical problems of the existing starch adhesives that the water resistance is not ideal, the transportation cost is high, and the starch modification process is complicated. The thermochemical modified starch is prepared through uniformly spraying an acid solution into the starch, carrying out uniform mixing, then, carrying out heating treatment, carrying out baking, carrying out cooling, and then, carrying out crushing. The method for preparing the adhesive comprises the following steps: adding polyvinyl alcohol into a reactor pot with stirring, heating and cooling devices, adding water, adopting a staged-heating method to dissolve the polyvinyl alcohol with stirring, and then, cooling to room temperature; adding the thermochemical modified starch, carrying out stirring at room temperature, and then, adding polymethylene polyphenyl polyisocyanate, thereby obtaining the adhesive. According to the method, by using the technological characteristic that the starch-based adhesive is prepared by only adding the water to the thermochemical modified starch before use, the problem that the traditional solution type starch main agents are low in transportation efficiency and are prone to layering and mildewing is solved.

Description

technical field [0001] The invention relates to a modified starch and an adhesive prepared by using the starch, in particular to a starch-based adhesive used for waterproof plywood and the thermochemically modified starch. Background technique [0002] As the world's largest country in wood-based panel production, consumption and import and export trade, China's wood-based panel production has exceeded 322 million cubic meters in 2015. However, most of the adhesives used in my country's current wood-based panel production are still formaldehyde-based synthetic resins (mainly urea-formaldehyde resin adhesives and melamine-modified urea-formaldehyde resins). Products will release formaldehyde during manufacture, storage and use, and the issue of formaldehyde release from wood-based panels and the safety of the living environment have attracted more and more attention. Using starch, vegetable protein, lignin and other bulk biomass raw materials to prepare formaldehyde-free envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/04C08B31/06C09J103/06C09J11/06
Inventor 高振华李舒野张冰寒顾继友张彦华
Owner NORTHEAST FORESTRY UNIVERSITY
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