Starch-based aqueous macromolecule-isocyanate wood adhesive and preparation method thereof

A water-based polymer, wood adhesive technology, applied in the direction of adhesive, adhesive type, graft polymer adhesive, etc., can solve the problems of poor bonding, loss of polymerized isocyanate, fast drying speed of adhesive film, etc., to achieve good stability properties, improving water loss and drying, and good physical and chemical properties

Inactive Publication Date: 2010-01-13
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this traditional synthetic resin-type water-based polymer-isocyanate wood adhesive has the following problems: high cost; release of other harmful substances; high viscosity; limited activity period extension, resulting in a certain amount of polymerized isocyanate (P-MDI) loss; The film dries quickly and is prone to defects such as poor local gluing

Method used

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  • Starch-based aqueous macromolecule-isocyanate wood adhesive and preparation method thereof
  • Starch-based aqueous macromolecule-isocyanate wood adhesive and preparation method thereof
  • Starch-based aqueous macromolecule-isocyanate wood adhesive and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1-3

[0027] Embodiment 1-3: the preparation of type I starch-based water-based polymer-isocyanate wood adhesives of different compressive shear strengths of the present invention

[0028] The weight ratio of each raw material in each embodiment is shown in Table 1.

[0029] Preparation method: (taking Example 1 as an example, other examples are basically the same as Example 1 except that the amount of raw materials is different)

[0030] (1) Dilute the concentration to 0.5mol·L -1 Add 24.53kg of hydrochloric acid solution into the reaction kettle with agitator and condenser, slowly add 13.20kg of cornstarch into the hydrochloric acid solution, stir vigorously to prepare cornstarch milk with a concentration of 35%, heat it to 55°C and keep it warm. Add 0.07kg of ammonium persulfate to cornstarch milk for the first time, stir evenly, acidolysis and oxidation at 55°C, and pre-initiate for 30 minutes at the same time, adjust the pH value to 7 with 10% sodium hydroxide to obtain primar...

Embodiment 4-6

[0036] Embodiment 4-6: the preparation of type II starch-based water-based polymer-isocyanate wood adhesives of different compressive shear strengths of the present invention

[0037] The weight ratio of each raw material in each embodiment is shown in Table 2.

[0038] Table 2

[0039]

[0040] Preparation method: (taking Example 4 as an example, other examples are basically the same as Example 4 except that the amount of raw materials is different)

[0041] (1) Dilute the concentration to 0.5mol·L -1 Add 30.66kg of hydrochloric acid solution into the reaction kettle with agitator and condenser, slowly add 16.50kg of cornstarch into the hydrochloric acid solution, stir vigorously to prepare cornstarch milk with a concentration of 35%, heat it to 55°C and keep it warm. Add 0.10 kg of ammonium persulfate to cornstarch milk for the first time, stir evenly, acidolysis and oxidation at 55°C, and pre-initiate for 30 minutes at the same time, adjust the pH value to 7 with 10% sod...

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Abstract

A wood adhesive made from isocyanate which is starch base water based polymer is made into main agent consisting of 40 portions to 65 portions of composite modified corn starch emulsion, 8 portions to15 portions of dibasic acid esterifying agent, and 10 portions to 30 portions of polyvinyl alcohol; polymerization isocyanate that is not closed is used for curing agent. The type I and II nonformadehyde with different compression-shear strength are adhesive. The type I repeatedly boiling, type II impregnation in hot water and type II normal state, etc., can be made when being used. The adhesive can be widely applied to wood or bamboo adhesive products such as multi-layer plywood, three-layer wood or bamboo parquet floor, a multi-layer wood parquet floor, a block board, bending wood furniture, a particle board and so on, characterized by inimitable design, low making cost, a long activity period, low apparent viscosity, an easily available equipment, good prepressing performance, easy operation, and no environment pollution. Ecological environmental benefits social and economic benefits come into being after the application and popularization of the product.

Description

technical field [0001] The invention relates to a starch-based water-based polymer-isocyanate wood adhesive and a preparation method thereof, belonging to the technical field of adhesives in chemistry. Background technique [0002] Traditional synthetic resin-based water-based polymer-isocyanate wood adhesives (hereinafter referred to as "water-based polymer-isocyanate wood adhesives": API wood adhesives) generally use the -NCO group in polymeric isocyanate (P-MDI) to temporarily block . When wood glued products are hot-pressed, the adhesive is dissociated using a sealing agent at high temperature, and -NCO is released. At this time, the released free -NCO is combined with the active groups in the API wood adhesive main agent and the wood structure. The active group has a cross-linking reaction to achieve the purpose of extending the pot life. However, this traditional synthetic resin-type water-based polymer-isocyanate wood adhesive has the following problems: high cost; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J151/02
Inventor 时君友顾继友涂怀刚王垚
Owner BEIHUA UNIV
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