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Formaldehyde aqueous adhesive and preparation method thereof

A water-based adhesive and formaldehyde solution technology, which is applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, polymer adhesive additives, etc. Environmental protection requirements and other issues, to achieve the effect of low cost of raw materials, simple production process, and elimination of free formaldehyde

Inactive Publication Date: 2011-11-23
山东光华新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Urea-formaldehyde resin is the main type of glue used in the production of wood-based panels in my country, accounting for more than 90% of the glue used in wood-based panels. However, urea-formaldehyde resin produced according to conventional production methods has a high content of free formaldehyde, which does not meet environmental protection requirements.
[0003] Diacetone acrylamide distillation raffinate is the waste liquid after distillation in the production process of diacetone acrylamide. Its components are high molecular compounds containing amino groups. If it is discharged directly, it will pollute the local surface environment; the method of incineration will produce a large amount of Nitrogen oxides, which pollute the atmosphere very seriously; the current method is deep burial, which needs to consume more funds, and has been restricting the development of diacetone acrylamide enterprises to a large extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take the finished urea-formaldehyde resin, add glacial acetic acid to adjust the pH value to 5, then add the diacetone acrylamide distillation residue with 8% of the urea-formaldehyde resin mass, stir evenly, and heat the mixture to 40 ° C and stir for 30min, add the mass percentage concentration of Adjust the pH to 8 with 10% NaOH, then pack and discharge.

[0016] The components and parts by weight of the diacetone acrylamide distillation residue are: 5 diacetone acrylamide, 10 amine by-products, and 85 diacetone acrylamide polymer.

Embodiment 2

[0018] 1000 kilograms of aqueous formaldehyde solution with a mass percentage concentration of 37% are placed in the reaction vessel, and the hydrochloric acid with a mass percentage concentration of 10% is added to adjust the pH value to 2 to 3, heated to 32 ° C, and slowly added 300 under stirring conditions. Kilogram of urea; temperature is heated to 40 ℃, add 100 kilograms of diacetone acrylamide distillation raffinate, stirring reaction 35min, with hexamethylenetetramine solution regulation system pH value is 5~6, then add 220 kilograms of urea , the reaction temperature was controlled at 45-50°C, and the reaction was kept for 40 minutes; then the pH value of the system was adjusted to 8 with a 10% mass percent NaOH solution, cooled to 40°C, and discharged to obtain a formaldehyde-free aqueous adhesive.

[0019] The components and parts by weight of the diacetone acrylamide distillation residue are: 5 diacetone acrylamide, 10 amine by-products, and 85 diacetone acrylamide ...

Embodiment 3

[0021] 1000 kilograms of aqueous formaldehyde solution with a mass percent concentration of 37% are placed in the reaction vessel, adding 50 kg of ammonia water with a mass percent concentration of 25%, and adjusting the pH value with 10% NaOH under stirring conditions. 8; then heat up to 65-75°C, slowly add 300 kg of urea; after stirring for 40min, increase the reaction temperature to 90°C; keep the temperature for 30min, cool down to 85°C after the reaction viscosity is stable, and adjust the pH to 4.5 with formic acid -5.5; keep the temperature at 80-90°C; add 220 kg of urea and 100 kg of diacetone acrylamide distillation residue. When the glue drops into the clear water and becomes a white mist and does not disperse, adjust the pH to 8 with 10% NaOH by mass; continue the reaction for 20 minutes, cool down to 40°C, and discharge.

[0022] The components and parts by weight of the diacetone acrylamide distillation residue are: diacetone acrylamide 5, amine by-products 10, di...

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PUM

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Abstract

The invention discloses a formaldehyde aqueous adhesive and a preparation method thereof and belongs to the technical field of polymer organic synthesis. In the invention, diacetone acrylamide distillation residual liquid is added in the production process of finished product of urea resin or urea formaldehyde resin, so that the amino in the diacetone acrylamide distillation residual liquid can react with free formaldehyde in the urea formaldehyde resin to remove free formaldehyde in the urea formaldehyde resin. In the invention, under a condition of avoiding influencing the overall performance of the urea formaldehyde resin, free formaldehyde in the urea formaldehyde resin is eliminated effectively. The free formaldehyde content in the prepared adhesive is less than or equal to 0.01 percent.

Description

technical field [0001] The invention belongs to the technical field of polymer organic synthesis, in particular to a formaldehyde-free water-based adhesive and a preparation method thereof. Background technique [0002] Adhesives are one of the most important auxiliary materials and are widely used in packaging operations. Adhesives are sticky substances that join two separate materials together by their sticky properties. There are many types of adhesives. Urea-formaldehyde resin is the main type of glue in the production of wood-based panels in my country, accounting for more than 90% of the glue used for wood-based panels. However, the urea-formaldehyde resin produced by conventional production methods has high free formaldehyde content and does not meet the requirements of environmental protection. [0003] Diacetone acrylamide distillation residue is the waste liquid after distillation in the production process of diacetone acrylamide. Its composition is a polymer com...

Claims

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Application Information

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IPC IPC(8): C09J161/24C09J11/06C09J11/08C08G12/12
Inventor 朱玉国
Owner 山东光华新材料股份有限公司