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Preparation method of environment-friendly glue for shaving board

A production method and environment-friendly technology, applied in the direction of adhesive, adhesive type, aldehyde/ketone condensation polymer adhesive, etc., can solve the problem that the product is easy to foam, peel, and the moisture-proof effect of urea-formaldehyde resin adhesive cannot meet the requirements. and other problems, to achieve the effect of improving product quality, improving environmental performance, and high environmental protection functions

Inactive Publication Date: 2014-12-10
万华禾香板业(韶关)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the present invention can synthesize and produce urea-formaldehyde resin glue that meets the national standard for free formaldehyde emission, it has certain environmental protection effects, but the moisture-proof effect of the urea-formaldehyde resin glue prepared by using the molar ratio and process conditions may not meet the requirements. The product is prone to foaming and peeling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The specific content of the raw materials applied in the following processes is shown in Table 1, and the process steps are as follows:

[0026] (1) First, add 30% NaOH solution to 44% formaldehyde solution, stir, and adjust the pH of the mixed solution to 7.8;

[0027] (2) Heat up to 55°C and add urea for the first time;

[0028] (3) Keep heating evenly to boiling (steam is heated to 60°C, stop heating, self-reaction exothermic, and heat up to 90°C in about 35 minutes), add 20% formic acid during the process, and keep the pH between 5.8 ;

[0029] (4) When the solution reaches boiling state, continue to add 20% formic acid to adjust the pH value to 5.3, and measure the viscosity for 12 seconds;

[0030] (5) After the viscosity is qualified, add 30% NaOH solution to adjust the pH to 6.5, while passing water to cool down to 90°C, add urea for the second time, keep it warm for 10 minutes without steam, and check the pH value and concentration of the solution;

[0031] ...

Embodiment 2

[0037] (1) First, add 35% NaOH solution to 44% formaldehyde solution, stir, and adjust the pH of the mixed solution to 8.0;

[0038] (2) Heat up to 60°C and add urea for the first time;

[0039] (3) Keep the temperature rising evenly to boiling (steam is heated to 60°C, stop heating, self-reaction exothermic, and heat up to 95°C in about 40 minutes), add 20% formic acid during the process, and keep the pH between 6.3 ;

[0040] (4) When the solution reaches the boiling state, continue to add 20% formic acid to adjust the pH value to 5.5, and measure the viscosity for 14 seconds;

[0041] (5) After the viscosity is qualified, add 35% NaOH solution to adjust the pH to 7.0, while passing water to cool down to 90°C, add the second urea, keep it warm for 10 minutes without steam, and check the pH value and concentration of the solution;

[0042] (6) Add 20% formic acid solution, adjust the pH value to 5.6, react at 90°C for 32s, and rotate the viscometer at 155cps. If the viscosi...

Embodiment 3

[0048] (1) First, add 32% NaOH solution to 44% formaldehyde solution, stir, and adjust the pH of the mixed solution to 7.9;

[0049] (2) Heat up to 58°C and add urea for the first time;

[0050] (3) Keep heating evenly until boiling (steam is heated to 60°C, stop heating, self-reaction exothermic, and heat up to 92°C in about 38 minutes), add 20% formic acid during the process, and keep the pH between 6.0 ;

[0051] (4) When the solution reaches the boiling state, continue to add 20% formic acid to adjust the pH value to 5.4, and measure the viscosity for 13 seconds;

[0052] (5) After the viscosity is qualified, add 32% NaOH solution to adjust the pH to 6.8, while passing water to cool down to 90°C, add urea for the second time, keep it warm for 10 minutes without steam, and check the pH value and concentration of the solution;

[0053] (6) Add 20% formic acid solution, adjust the pH value to 5.5, react at 89°C for 31s, and rotate the viscometer at 150cps. If the viscosity ...

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PUM

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Abstract

The invention discloses a preparation method of environment-friendly glue for a shaving board, and belongs to the field of preparation of an adhesive for a shaving board. The preparation method of the environment-friendly glue is as follows: the environment-friendly glue is prepared from formaldehyde, urea, formic acid and NaOH solution, wherein formic acid and NaOH solution are used for regulating the PH of a solution. According to the method, free formaldehyde in the glue is regulated by changing the feeding times and order of formaldehyde and urea and the content of urea, and the structure of resin is regulated by controlling the temperature and the pH indicators in various processing steps, so that the structure of the resin is relatively stable; therefore, the product has an excellent environmental protection function, and can be widely applied to the field of shaving board manufacturing.

Description

technical field [0001] The invention relates to the technical field of environment-friendly polymer materials, in particular to a method for manufacturing environment-friendly glue used for particle boards. Background technique [0002] The output of wood-based panels in my country has ranked first in the world since 2004. Although the output of wood-based panels is large, there are not many varieties, especially too few functional varieties. At present, most factories only produce furniture-type or common-type MDF used in dry conditions, which cannot meet the needs of market development. The new national standard GB / T 11718-2009 "Medium Density Fiberboard", which came into effect on April 1, 2010, classifies MDF according to different use conditions. The 3 types of MDF, whether it is ordinary type, furniture type or load-bearing, are subdivided into 4 use states of dry, wet, high humidity and outdoor according to different environmental conditions, and it is stipu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/24C08G12/12
Inventor 杨吟森党鹏
Owner 万华禾香板业(韶关)有限公司
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