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Resin adhesive and preparation method thereof

A technology of resin adhesives and composite catalysts, applied in adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve problems such as high curing temperature, short storage period, and low production efficiency, and achieve The effect of increasing adhesive performance, increasing cross-linking density, and simple preparation method

Active Publication Date: 2017-06-23
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, because PF resin uses phenol as the main raw material, and the price of phenol is expensive, the price of PF resin remains high, and PF resin itself also has some disadvantages, such as short storage period and curing speed compared with other amino resins. Slower and higher curing temperature, these result in relatively high prices of PF resin adhesive products and low production efficiency, which limits the wider application of PF resin adhesives

Method used

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  • Resin adhesive and preparation method thereof
  • Resin adhesive and preparation method thereof
  • Resin adhesive and preparation method thereof

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preparation example Construction

[0059] The present invention also provides a preparation method of the resin adhesive described in the above technical solution, comprising the following steps:

[0060] (1) phenol, melamine-modified polymethylol urea and part of the composite catalyst are mixed, and the addition reaction obtains the mixture;

[0061] (2) the mixture that described step (1) obtains is mixed with formaldehyde aqueous solution and remaining composite catalyst, and condensation reaction obtains polymer;

[0062] (3) mixing the polymer obtained in the step (2) with lignin, and performing a polymerization reaction to obtain a resin;

[0063] (4) Mix the resin obtained in the step (3) with a polyaldehyde cross-linking agent, and perform a cross-linking reaction to obtain a resin adhesive.

[0064] In the present invention, there is no special limitation on the preparation device of the resin adhesive, and a reaction vessel well known to those skilled in the art can be used. In the embodiment of th...

Embodiment 1

[0074] Taking the total mass of the adhesive raw material as 100%, the components and mass percentages in the raw material are as follows:

[0075]

[0076] The specific steps of preparation are as follows:

[0077] (1) Mix 10kg of urea, 21kg of formaldehyde and 0.5kg of polyvinyl alcohol evenly, add a 30% formic acid aqueous solution, adjust the pH value to 6.5, supplement the stirring mode speed and time value with mechanical stirring at a speed of 80r / min for 5min; Heat to 90°C, keep warm for 1 hour, add 6 kg of melamine, keep warm at 75°C until the viscosity of Tu 4 is 10 seconds, slowly cool down to 50°C, add 20% sodium hydroxide aqueous solution, adjust the pH value to 8.0, and react After 5 minutes, the temperature was lowered to 30° C., and the material was discharged to obtain polymethylol urea;

[0078] (2) Put 10kg of phenol and 10kg of polymethylol urea into the reactor, mix evenly, add 4kg of sodium hydroxide and 0.8kg of zinc oxide, react for 10 minutes and gra...

Embodiment 2

[0086] Taking the total mass of the adhesive raw material as 100%, the components and mass percentages in the raw material are as follows:

[0087]

[0088] The specific steps of preparation are as follows:

[0089] (1) Mix 10kg urea, 21kg formaldehyde and 0.5kg polyvinyl alcohol evenly, add 30% formic acid aqueous solution, adjust the pH value to 6.5, stir mechanically at a speed of 80r / min for 5min; heat to 90°C, and keep warm for reaction 1h, add 6kg of melamine, keep warm at 75°C until the viscosity of Tu 4 is 13 seconds, slowly cool down to 50°C, add 20% sodium hydroxide aqueous solution, adjust the pH value to 8.0, react for 5min, cool down to 30°C, Discharge, obtain polymethylol urea;

[0090] (2) 15kg of phenol and 15kg of polymethylol urea were put into the reactor, mixed evenly, 2kg of sodium hydroxide and 0.4kg of magnesium oxide were added, and after 10 minutes of reaction, the temperature was gradually raised to 90°C, and the reaction was kept for 20 minutes t...

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Abstract

The invention provides a resin adhesive and a preparation method thereof. The resin adhesive is prepared from the following raw materials in percentages by weight: 30-50% of a formaldehyde solution, 10-25% of phenol, 10-20% of melamine-modified polyhydroxymethyl urea, 20-40% of lignin, 5-10% of a polyaldehyde cross-linking agent and 3-6% of a composite catalyst, wherein the mass concentration of the formaldehyde solution is 35-40%; and the composite catalyst comprises a mixture of one of zinc oxide, magnesium oxide, calcium hydroxide, barium hydroxide, potassium hydroxide and potassium carbonate, and sodium hydroxide. With the melamine-modified polyhydroxymethyl urea as the raw material, the storage stability of methylol urea is improved, the storage period of the resin adhesive is prolonged, the polymerization reaction of an ortho-response point with relatively poor activity in a phenol structure in the lignin is directionally promoted by the composite catalyst, and low-temperature fast solidification of the resin adhesive is achieved.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a resin adhesive and a preparation method thereof. Background technique [0002] Adhesives for wood account for more than 60% of the total output of adhesives, and with the continuous development of the wood processing industry, the amount used is increasing, and the varieties are also increasing. The development of the adhesive industry has also had a positive impact on the development of the particleboard and fiber bench wood industry, making full use of small-diameter grades, branches, thinning wood, and wood processing residues, and improving the comprehensive utilization of wood. The rate improves the performance of wood. Adhesives have become a key link in determining the development level of particleboard and fiberboard production. [0003] Phenolic resin (PF resin), urea-formaldehyde resin and melamine-formaldehyde resin are collectively known as the three major resin ...

Claims

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Application Information

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IPC IPC(8): C09J161/34C08G14/12
CPCC08G14/12C09J161/34
Inventor 范东斌李改云储富祥
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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