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Method for utilizing formaldehyde residues for preparing biomass adhesive

A biomass and adhesive technology, used in adhesives, aldehyde/ketone condensation polymer adhesives, hyaluronic acid adhesives, etc., can solve the problems of pollution, air pollution, harsh production environment, etc., and achieve low formaldehyde emission , Conducive to environmental protection, high viscosity effect

Inactive Publication Date: 2018-05-04
NANJING FORESTRY UNIV +1
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  • Summary
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Formaldehyde waste residue will slowly decompose in the natural environment and release harmful gas formaldehyde again, so if it is not handled properly, it will cause long-term regional environmental air pollution
In recent years, although many workshop-style factories have adopted simple methods such as boiling lye to redissolve formaldehyde slag to make formaldehyde solution, the production environment is harsh, the pollution is serious, the product quality is unstable, and the market order is disturbed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, add 100kg of 75% choline chloride and 200kg of urea into the reactor, stir and heat up to 90°C, add 30kg of industrial lignin, stir for 10 minutes; add 400kg of formaldehyde residue, 480kg of water, heat up to 75°C, and stir for 40 minutes ;Add the second urea 260kg, heat up to 90°C, react for 15min, cool down to 75°C, adjust the pH value to 5.1 with formic acid, react at 90°C for 100min, add the third urea 160kg, stir and adjust the pH value to 6.5 , react for 60 minutes, check the viscosity, when the viscosity reaches 22s / 25°C · After coating -4 cups, cool down to 60°C, add condensed tannin 20kg and chitin 5kg, stir for 30min, add ammonia water to adjust the pH value to 7.8, cool down to 35 °C, discharge the material, and obtain the modified biomass adhesive product.

[0021] The performance indexes of the prepared biomass modified adhesive product are as follows: solid content: 65.4%, pH value: 7.8, viscosity (25°C): 24s, free formaldehyde content: 0.05%. The...

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PUM

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Abstract

The invention relates to a method for utilizing formaldehyde residues for preparing a modified biomass adhesive. The method belongs to the technical field of adhesives, and comprises the steps of firstly utilizing a choline chloride-urea eutecticevaporate ionic liquid for modifying lignin, utilizing the ionic liquid-water as a medium for regenerating and activating the formaldehyde residues, and then further copolymerizing urea to form a resin; finally adding condensed tannin and chitin for modifying and reducing free formaldehyde. The method can effectively and fully utilize the waste formaldehyde residues so as to be beneficial to environment protection, and the prepared modified biomass adhesive is high in adhesiveness, good in toughness, low in formaldehyde emission, and capable of being widely applied in top-grade household material production.

Description

technical field [0001] The invention relates to a method for preparing an environment-friendly adhesive by using waste formaldehyde slag, and belongs to the technical field of adhesives. technical background [0002] Formaldehyde is a large and important chemical raw material in my country's chemical industry, with an annual output of more than 38 million tons. Formaldehyde is easy to self-polymerize to form precipitates (commonly known as formaldehyde slag) during storage and transportation. This phenomenon is more prominent for high-concentration formaldehyde; Therefore, it needs to be cleaned regularly; according to incomplete statistics, the formaldehyde waste residue produced in my country reaches about 1 million tons every year. Formaldehyde waste residue will slowly decompose in the natural environment and release harmful gas formaldehyde again. Therefore, if it is not handled properly, it will cause long-term regional environmental air pollution. In recent years, al...

Claims

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Application Information

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IPC IPC(8): C09J161/32C09J197/00C09J105/08C08H7/00C08G12/40
CPCC08G12/40C08H6/00C08L2205/03C09J161/32C08L97/005C08L5/08
Inventor 孙丰文张茜孙静董西鼎
Owner NANJING FORESTRY UNIV
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