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Preparation method and use method of cross-linked hyperbranched amine-modified oxidized starch adhesive for laminated wood

A technology for oxidizing starch and adhesives, applied in the direction of starch-derived adhesives, adhesive types, etc., can solve the problems of water resistance and low wet bonding strength of starch adhesives, and achieve improved corrosion resistance and wide application And development prospects, the effect of simple preparation process

Inactive Publication Date: 2019-05-14
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the technical problem of low wet bonding strength and water resistance of existing starch adhesives, and provides a preparation method of cross-linked hyperbranched amine-modified oxidized starch adhesives applied to glued wood and how to use

Method used

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  • Preparation method and use method of cross-linked hyperbranched amine-modified oxidized starch adhesive for laminated wood
  • Preparation method and use method of cross-linked hyperbranched amine-modified oxidized starch adhesive for laminated wood
  • Preparation method and use method of cross-linked hyperbranched amine-modified oxidized starch adhesive for laminated wood

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specific Embodiment approach 1

[0029] Embodiment 1: This embodiment is a method for preparing a cross-linked hyperbranched amine-modified oxidized starch adhesive applied to glued wood. The specific process is as follows:

[0030] 1. Preparation of oxidized starch adhesive: Add cornstarch and distilled water into a four-necked flask, and the four ports of the four-necked flask are respectively connected to a stirring device, a thermometer, a spherical condenser tube and a rubber stopper; the cornstarch and distilled water are stirred evenly and then added Ammonium sulfate, then put it in a water bath at 60°C to 65°C and keep it warm for 2h to 2.5h, then raise the temperature of the water bath to 90°C to 95°C and gelatinize at 90°C to 95°C for 0.5h to 1h to adjust the pH value of the product 7.8-8.2, naturally cooled to room temperature to prepare oxidized starch adhesive;

[0031] The mass ratio of described cornstarch and distilled water is 1:(5.5~6);

[0032] The mass ratio of described ammonium persulfa...

specific Embodiment approach 2

[0041] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the pH value of the product is adjusted in step 1 by adding sodium hydroxide aqueous solution or hydrochloric acid. Others are the same as the first embodiment.

specific Embodiment approach 3

[0042] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the organic polar solvent described in step three is dimethyl sulfoxide, N,N-dimethylformamide and N,N- One or more mixtures of dimethylacetamide. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method and a use method of a cross-linked hyperbranched amine-modified oxidized starch adhesive for laminated wood and relates to a starch adhesive applied to thelaminated wood and a use method thereof. The preparation method and the use method of the cross-linked hyperbranched amine-modified oxidized starch adhesive for the laminated wood aim to solve the technical problems that the existing starch adhesive is relatively low in wet bonding strength and is not resistant to water. The preparation method comprises the following steps of I, preparing an oxidized starch adhesive; II, preparing a hyperbranched amine aqueous solution; III, preparing an oxidized starch grafted with trimesoyl chloride; and IV, preparing the cross-linked hyperbranched amine-modified oxidized starch adhesive. The cross-linked hyperbranched amine modified oxidized starch adhesive is uniformly smeared on the inner surface of a surface plate and two surfaces of a core plate byusing a brush, then the surface plate and the core plate are laminated to form a multilayer plate blank, and hot pressing is performed on the multilayer plate blank to finally obtain the multiply plywood. According to the preparation method and the use method of the cross-linked hyperbranched amine-modified oxidized starch adhesive for the laminated wood disclosed by the invention, hyperbranchedamine modification is performed on the oxidized starch adhesive, and then the laminated wood is prepared, the water resistance and the bonding property are improved, the corrosion effect of wood-inhabiting fungi on the laminated wood is inhibited and the service life is prolonged.

Description

technical field [0001] The invention relates to a starch adhesive applied to glued wood and its application method. Background technique [0002] Wood adhesive is a material that glues wood and the surface of wood or other objects into one. The most commonly used wood adhesive on the market today is "trialdehyde" glue. However, there is free formaldehyde in these glues, which is harmful to the environment. Starch is a kind of renewable and biodegradable natural plant material, which has the characteristics of low cost, convenient processing and no irritating smell. Since starch adhesives have many excellent properties, the market potential of developing starch-based adhesives, an environmentally friendly adhesive, is huge. The modification of adhesives is one of the hot issues in the field of wood processing. Adhesives synthesized by introducing certain functional polymers not only have good mechanical properties, but also further improve their water resistance and abras...

Claims

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Application Information

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IPC IPC(8): C09J103/10C08B31/18
Inventor 左宏亮李熠诗刘瀚然王照稳梅力丹
Owner NORTHEAST FORESTRY UNIVERSITY
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