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Preparation method of phenol-urea-formaldehyde resin adhesive for E0-grade outdoor plywood

An outdoor, plywood technology, applied in adhesives, manufacturing tools, adhesive types, etc., to solve problems such as dark color, high cost of phenolic resin, and short shelf life

Inactive Publication Date: 2011-08-03
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the shortcomings of high cost, dark color and short storage period of urea modified phenolic resin existing in the prior art, the present invention provides a kind of E 0 The preparation method of phenol-urea-formaldehyde resin glue for grade outdoor plywood, the plywood pressed with this glue, the bonding strength meets the requirements of class I plywood, and the formaldehyde emission meets the requirements of E 0 level requirements

Method used

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  • Preparation method of phenol-urea-formaldehyde resin adhesive for E0-grade outdoor plywood
  • Preparation method of phenol-urea-formaldehyde resin adhesive for E0-grade outdoor plywood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Add 136.4g of phenol, 110g of the first batch of formaldehyde solution with a mass concentration of 36.5%, 9g of the first batch of urea, 15g of water and 0.3g of CaO into a 500ml four-necked flask, and heat up to 90°C for 50min. Wherein the molar ratio of formaldehyde / phenol is 0.84~0.99, and the molar ratio of formaldehyde / (phenol+urea) is 0.64~0.85;

[0030] The second step: adding again mass concentration is 36.5% formaldehyde solution 100g, urea 9g, gradually adding mass concentration is 50% NaOH solution 14g, the mol ratio of formaldehyde / phenol in the control system is 1.68~2.28, formaldehyde / (phenol+ urea) with a molar ratio of 1.46 to 1.68, and reacted at 90° C. for 70 minutes.

[0031] The third step: adding 70g of formaldehyde solution with a mass concentration of 36.5%, gradually adding 14g of NaOH solution with a mass concentration of 50%, the molar ratio of formaldehyde / phenol in the control system is 2.30~3.00, the molar ratio of formaldehyde / (pheno...

Embodiment 2

[0035] Step 1: Add 136.4g of phenol, 118g of the first batch of formaldehyde solution with a mass concentration of 36.5%, 15g of the first batch of urea, 15g of water and 0.3g of CaO into a 500ml four-neck flask, and heat up to 90°C for 50min.

[0036] The second step: add the second batch of 116g of formaldehyde solution with a mass concentration of 36.5%, the second batch of urea 15g, gradually add the first batch of 14g of NaOH solution with a mass concentration of 50%, and react at 90°C for 70min.

[0037] Step 3: add the third batch of 40 g of formaldehyde solution with a mass concentration of 36.5%, gradually add the second batch of 14 g of NaOH solution with a mass concentration of 50%, and react at 85-90° C. for 60 minutes.

[0038] Step 4: add the third batch of urea 24g, the third batch of 50% NaOH solution 40g, react at 80°C for 15min, the viscosity is 1.6s according to the Grizzard tube pouring test method, and cool and discharge.

[0039] Test its physical and che...

Embodiment 3

[0041] Step 1: Add 95.4g of phenol, 80g of the first batch of formaldehyde solution with a mass concentration of 36.5%, 18g of the first batch of urea, 11g of water and 0.3g of CaO into a 500ml four-necked flask, and heat up to 90°C for 50min.

[0042] The second step: add the second batch of 90 g of formaldehyde solution with a mass concentration of 36.5%, gradually add the first batch of 10 g of NaOH solution with a mass concentration of 50%, and react at 90° C. for 70 minutes.

[0043] Step 3: add the third batch of 40g of formaldehyde solution with a mass concentration of 36.5%, the second batch of urea 18g, gradually add the second batch of 10g of NaOH solution with a mass concentration of 50%, and react at 90°C for 60min.

[0044] Step 4: Add the third batch of urea 14.4g, the third batch of 50% NaOH solution 28g, react at 80°C for 10min, the viscosity is 1.8s according to the Grizzard tube inversion method, and cool and discharge.

[0045] Test its physical and chemical...

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Abstract

The invention discloses a preparation method of a phenol-urea-formaldehyde resin adhesive for E0-grade outdoor plywood. The preparation method comprises the following steps: step 1, mixing phenol, a formaldehyde solution and urea, adding a catalyst, and rising the temperature for reaction; step 2, adding the formaldehyde solution and urea which can also be added in the step 3 again, adding an alkali metal hydroxide solution for reaction; step 3, continuing to add the formaldehyde solution and the alkali metal hydroxide solution, if the urea is not added in the former step, adding the urea forreaction at the moment; and step 4, adding the urea and the alkali metal hydroxide solution for reaction until the viscosity is 1.5-2.0 seconds measured by a gardner-holdt tube reverse bubble measurement method, and then discharging. The adhesive-making process is mild in reaction and is easy to control, repeatability is good, and the storage life of the adhesive is more than 30 days. The strength of the plywood made of the adhesive meets the E0-grade requirement of I type plywood.

Description

technical field [0001] The present invention relates to a kind of preparation method of environment-friendly type I type plywood with phenolic resin glue, relate in particular to a kind of E 0 Preparation method of urea-modified low-cost phenolic resin glue for Class I plywood. Background technique [0002] In 2007, China's wood-based panel output was 88.3858 million m 3 According to the Forest Products Industry Association, 5.3568 million tons of adhesives for wood-based panels (100% solids) are estimated, of which 5.0449 million tons are urea-formaldehyde resins, accounting for 94.18%; 256,700 tons are phenolic resins, accounting for 4.79%. Phenolic resin glue has high bonding strength, excellent weather resistance and water resistance, and has become the first choice for outdoor-grade wood-based panels. It is mainly used for outdoor-grade plywood such as concrete formwork, carriage panels, and container floors. Phenolic resin also has the disadvantages of darker color, ...

Claims

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Application Information

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IPC IPC(8): C08G14/08C09J161/34B27D1/04
Inventor 赵临五储富祥王春鹏张伟石建军俞阳
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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