Preparation of urea-formaldehyde resin for environment-friendly artificial board

An environment-friendly, urea-formaldehyde resin technology, applied in adhesive types, aldehyde/ketone condensation polymer adhesives, adhesives, etc., can solve problems such as pollution and inability to apply medium and high-end furniture production, to reduce formaldehyde and improve Application performance, the effect of improving the degree of polycondensation

Inactive Publication Date: 2009-07-08
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In the above patent report, although low-formaldehyde urea-formaldehyde resin glue is prepared, free formaldehyde is still released during the board making process, causing pollution and cannot be applied to the production of high-end furniture

Method used

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  • Preparation of urea-formaldehyde resin for environment-friendly artificial board
  • Preparation of urea-formaldehyde resin for environment-friendly artificial board
  • Preparation of urea-formaldehyde resin for environment-friendly artificial board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 1000.0g of 38.5% formaldehyde into a 2000-liter three-neck flask at one time, stir, adjust the pH to 6.5-7.0 with 20% sodium hydroxide solution, heat the electric heating mantle to 50-53°C, and add the first batch of urea 385.0g , self-heating, reacting for 15 minutes, then raising the temperature to 85-88°C, and keeping it warm for 15 minutes; naturally cooling down to 65-75°C, adjusting the pH to 3.0-3.5, and polymerizing at a temperature of 65-75°C until the glue drops into 40°C until small comet-like particles appear in the water; adjust the pH to 6.5-7.0, add the second batch of urea 93.7g, add modifier (melamine) 60.0g, stir at 65-75°C for 5min, and then acidify with formic acid To pH 4.0-4.4, stir at the same temperature for 15 minutes; adjust the pH to 6.5-7.0, add the third batch of urea 46.9g and 128.0g ethanol, stir at 65-75°C for 5 minutes; then use formic acid to adjust the pH to 4.0-4.4 , stirred at 65-75°C for 15 minutes; adjusted the pH to 6.5-7.0 wi...

Embodiment 2

[0035] Add 1,000.0g of 38.5% formaldehyde into a 2,000-liter three-neck flask at one time, stir, adjust the pH to 7.0-7.2 with 20% sodium hydroxide solution, heat the electric heating mantle to 53-55°C, and add the first batch of urea 385.0g , self-heating, reacting for 20 minutes, then raising the temperature to 88-90°C, and keeping it warm for 22 minutes; naturally cooling down to 75-85°C, adjusting the pH to 3.5-4.0, polymerizing at a temperature of 75-85°C until the glue drips into 40°C until small comet-like particles appear in the water; adjust the pH to 7.0-7.5, add the second batch of urea 100.0g, add modifier (melamine) 45.0g, stir at 75-85°C for 15min, and then acidify with formic acid To pH 4.4-4.8, stir at the same temperature for 25 minutes; adjust the pH to 7.0-7.5, add the third batch of urea 30.0g and 90.8g ethanol, stir at 75-85°C for 15 minutes; then use formic acid to adjust the pH to 4.4-4.8 , stirred at 75-85°C for 25 minutes; adjusted pH to 7.0-7.5 with s...

Embodiment 3

[0037] Add 1,000.0g of 38.5% formaldehyde into a 2,000-liter three-neck flask at one time, stir, adjust the pH to 7.2-7.5 with 20% sodium hydroxide solution, heat the electric heating mantle to 65-70°C, and add the first batch of urea 385.0g , self-heating, reacting for 30 minutes, then raising the temperature to 90-95°C, and keeping it warm for 30 minutes; naturally cooling down to 85-90°C, adjusting the pH to 4.8-5.5, and polymerizing at a temperature of 85-90°C until the glue drops into 40°C until comet-shaped colloidal particles appear in the water; adjust the pH to 7.5-7.8, add the second batch of urea 180.0g, add modifier (melamine) 24.0g, stir at 85-90°C for 25min, and then acidify with formic acid To pH 5.8-6.0, stir at the same temperature for 35 minutes; adjust the pH to 7.5-7.8, add the third batch of urea 95.0g and 54.0g ethanol, stir at 85-90°C for 25 minutes; then use formic acid to adjust the pH to 5.8-6.0 , stirred at 85-90°C for 35 minutes; adjusted pH to 7.5-...

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Abstract

The invention relates to a preparation method for a urea formaldehyde resin used for an environmentally friendly man-made panel. The preparation method comprises the following steps: taking a reaction route of weak base-weak acid-weak base, firstly carrying out the polyaddition of formaldehyde and urea to generate dimethylolurea through a plurality of condensation polymerizations based on the traditional one filling reaction, then carrying out the gradual condensation in an acid medium to generate a linear urea formaldehyde resin, finally gradually adding urea molecules as connection means to improve the length of a linear molecule, reducing the content of free formaldehyde in the urea formaldehyde resin glue, directly synthesizing the green low formaldehyde urea formaldehyde resin glue product, improving the condensation degree and reducing the content of hydroxymethyl, methylene ether and hemiformal through step control, promoting the formation of body type organic micromolecules via microscope, adding a tiny amount of formaldehyde capture agent at the solidification phase to remove residual free formaldehyde, and setting the content of the free formaldehyde in the product to be less than or equal to 0.1 percent, and finally making the product performance technical indicators reach the domestic leading level.

Description

technical field [0001] The invention relates to a urea-formaldehyde resin adhesive and an improvement of a preparation method thereof, in particular to a preparation method of a high-performance environment-friendly urea-formaldehyde resin for wood-based panels, which belongs to the technical field of adhesives in chemistry. Background technique [0002] Urea-formaldehyde resin adhesive (UF resin) is urea and formaldehyde under the action of a catalyst, condensed into an initial urea-formaldehyde resin, and then under the action of a curing agent or an auxiliary agent, it forms an insoluble and infusible final resin. Urea-formaldehyde resin glue has the advantages of high bonding strength, fast curing, good operability, low cost, and rich sources of raw materials. It is widely used in production. Because in the process of using urea-formaldehyde resin or products prepared by urea-formaldehyde resin adhesive, the released formaldehyde irritates people's eyes and respiratory ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/12C09J161/24
Inventor 张跃叶涛严生虎刘建武沈介发
Owner JIANGSU POLYTECHNIC UNIVERSITY
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