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Zero-formaldehyde wood adhesive and preparation method thereof

A wood adhesive, zero-formaldehyde technology, applied in the field of zero-formaldehyde wood adhesive and its preparation, can solve the problems of formaldehyde pollution, harm to health, unsatisfactory, etc., achieve good bonding performance and water resistance, solve the problem of formaldehyde pollution, The effect of good development momentum

Inactive Publication Date: 2017-08-01
孙小力
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production and manufacture of wood-based panels inevitably involves the application of adhesives. Nowadays, phenolic glue, urea-formaldehyde glue, and melamine-formaldehyde glue still occupy a dominant position in the wood-based panel industry. These types of adhesives are relatively mature in production and application, but they are easy to use. Cause formaldehyde pollution, seriously endanger people's health in the home environment
[0003] Formaldehyde is defined as the largest hazard of indoor air pollution, and has attracted more and more people's attention and awareness. The problem of indoor formaldehyde pollution is also an urgent problem to be solved in the wood-based panel industry. How to eliminate the release of formaldehyde from the root cause, many companies are also Many methods have been tried, such as adding amine formaldehyde scavenger, increasing the reaction degree of adhesive synthesis, spraying sealant on the surface of the board, etc., but these methods are not satisfactory, and there are still many deficiencies. The formaldehyde emission of the board is barely enough. Reach the E0 standard, but the formaldehyde in the adhesive is still released continuously

Method used

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  • Zero-formaldehyde wood adhesive and preparation method thereof
  • Zero-formaldehyde wood adhesive and preparation method thereof
  • Zero-formaldehyde wood adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of zero-formaldehyde wood adhesive, its formula is calculated as:

[0030]

[0031] Both starch and heavy calcium are fillers, and the filler composition includes one or more mixtures of starch, heavy calcium, light calcium, etc.;

[0032] TDI-50 is toluene diisocyanate.

[0033] (1) Add 4 / 5 parts by mass of vinyl tertiary carbonate, vinyl acetate, ethylhexyl acrylate, and acrylic acid monomers to the emulsifier in turn according to their hydrophilicity to form a stable milky white emulsification liquid.

[0034] (2) After mixing the remaining 1 / 5 parts by mass of each monomer, add it into a reaction kettle that has been heated to 60-65°C, add 1 / 3 parts by mass of potassium persulfate solution, and keep warm for 0.5-1h.

[0035] (3) When the temperature is raised to 75-80°C until blue fluorescence appears in the system, add an appropriate amount of pH regulator, and start to drop the emulsion and the remaining 2 / 3 parts by mass of the initiator, and control ...

Embodiment 2

[0039] A kind of zero-formaldehyde wood adhesive, its formula is calculated as:

[0040]

[0041] (1) Add 4 / 5 parts by mass of styrene, butyl acrylate, hydroxypropyl acrylate, and acrylic acid monomers into the emulsifier in turn according to their hydrophilicity to emulsify to form a stable milky white emulsion.

[0042] (2) After mixing the remaining 1 / 5 parts by mass of each monomer, add it into a reaction kettle that has been heated to 60-65°C, add 1 / 3 parts by mass of potassium persulfate solution, and keep warm for 0.5-1h.

[0043] (3) When the temperature is raised to 75-80°C until blue fluorescence appears in the system, add an appropriate amount of pH regulator, and start to drop the emulsion and the remaining 2 / 3 parts by mass of the initiator, and control the dropping time to 4-6h.

[0044] (4) After the emulsion is added dropwise, raise the temperature to 85°C, keep it warm for 30 minutes, and carry out vacuum treatment. The vacuum degree in the kettle is contro...

Embodiment 3

[0047] A kind of zero-formaldehyde wood adhesive, its formula is calculated as:

[0048]

[0049] (1) Add 4 / 5 parts by mass of vinyl butyrate, vinyl acetate, hydroxyethyl methacrylate, and acrylic acid monomers to the emulsifier in sequence according to their hydrophilicity to form a stable milky white emulsion.

[0050] (2) After mixing the remaining 1 / 5 parts by mass of each monomer, add it into a reaction kettle that has been heated to 60-65°C, add 1 / 3 parts by mass of potassium persulfate solution, and keep warm for 0.5-1h.

[0051] (3) When the temperature is raised to 75-80°C until blue fluorescence appears in the system, add an appropriate amount of pH regulator, and start to drop the emulsion and the remaining 2 / 3 parts by mass of the initiator, and control the dropping time to 4-6h.

[0052] (4) After the emulsion is added dropwise, raise the temperature to 85°C, keep it warm for 30 minutes, and carry out vacuum treatment. The vacuum degree in the kettle is contro...

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Abstract

The invention discloses a zero-formaldehyde wood adhesive and a preparation method thereof, and belongs to the technical field of adhesive preparation. The zero-formaldehyde wood adhesive is prepared by taking vinyl acetate monomer, acrylic acid monomer, hydroxyl-containing functional monomer, an emulsifying agent, an initiator and the like as raw materials to prepare copolymer emulsion with a semi-continuous process, adding a small amount of filler, preservative, curing agent and the like in the emulsion, and stirring and mixing, the adhesive has the advantages of strong initial adhesion, good film forming property, excellent water resistance, zero formaldehyde and the like, and can be widely applied to manufacturing and production of artificial boards such as plywood, core-boards, shaving boards and density boards.

Description

technical field [0001] The invention relates to a zero-formaldehyde wood adhesive and a preparation method thereof, belonging to the technical field of adhesives. Background technique [0002] Since 2000, my country's wood-based panel industry has developed rapidly, and has become the world's largest wood-based panel manufacturing and exporting country. The production and manufacture of wood-based panels inevitably involves the application of adhesives. Nowadays, phenolic glue, urea-formaldehyde glue, and melamine-formaldehyde glue still occupy a dominant position in the wood-based panel industry. These types of adhesives are relatively mature in production and application, but they are easy to use. Formaldehyde pollution is caused, which seriously endangers people's health in the home environment. [0003] Formaldehyde is defined as the first major hazard of indoor air pollution, and has attracted more and more attention and awareness. The problem of indoor formaldehyde po...

Claims

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Application Information

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IPC IPC(8): C09J175/04C08G18/62
Inventor 孙小力
Owner 孙小力
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