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Modified flame-retardant urea-formaldehyde resin adhesive for producing artificial boards and preparation method of same

A technology for urea-formaldehyde resin glue and wood-based panels, which is applied in adhesives, starch-derived adhesives, polyurea/polyurethane adhesives, etc., and can solve the problems of increased difficulty in product quality control, decreased resin reactivity, and decreased storage stability, etc. problems, to avoid drying evaporation loss, reduce free formaldehyde, and improve service life

Inactive Publication Date: 2019-08-16
河南森远科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as the molar ratio decreases, the mechanical properties of the plate decrease
The main reason is that the content of free formaldehyde and methylol in the low molar ratio urea-formaldehyde resin decreases, and the reactivity of the resin decreases, which often leads to a low degree of crosslinking of the resin and a decrease in storage stability. Insufficient cross-linking eventually leads to a decrease in the mechanical properties of the board
Therefore, in order to meet the requirements of environmental protection without affecting the mechanical properties of the product, the only way to increase the amount of urea-formaldehyde resin adhesive, reduce the production speed, and add melamine modification in the glue-making process, greatly increases the production cost and reduces the production efficiency. , product quality control is more difficult

Method used

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  • Modified flame-retardant urea-formaldehyde resin adhesive for producing artificial boards and preparation method of same
  • Modified flame-retardant urea-formaldehyde resin adhesive for producing artificial boards and preparation method of same
  • Modified flame-retardant urea-formaldehyde resin adhesive for producing artificial boards and preparation method of same

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preparation example Construction

[0032] The present invention also provides a method for preparing a modified flame-retardant urea-formaldehyde resin glue for producing wood-based panels, comprising the following steps:

[0033] 1) Put 320-450% by weight of formaldehyde solution into the enamel reaction kettle, adjust the pH value to alkaline with the adjusting solution, then add 3-8% by weight of polyvinyl alcohol, 100- 140% by weight of urea, which is heated up to 90-95°C and reacted for 40-50min;

[0034] 2) After the reaction, add 10-30% by weight of methanol and 1-2% by weight of melamine after the enamel reactor cools down, and adjust the pH value of the solution in the enamel reactor to 7.5- 8.8, heat up to 75-80°C, then put 100-120% by weight of urea into the enamel reactor for reaction;

[0035] 3) After the reaction in step 2), add 1-4% by weight of melamine and 3-5% by weight of phthalaldehyde, stir for 15-30min, and distill under reduced pressure to recycle the obtained formaldehyde;

[0036] 4)...

Embodiment 1

[0043] 1) Put 320% by weight of formaldehyde solution into the enamel reaction kettle, adjust the pH value to be alkaline with the adjusting solution, then add 3% by weight of polyvinyl alcohol and 100% by weight of urea to the enamel reaction kettle , raise its temperature to 90°C, and react for 400min;

[0044] 2) After the reaction, add 10% by weight of methyl alcohol and 1% by weight of melamine after the enamel reactor cools down, and adjust the pH value of the solution in the enamel reactor to 7.5-8.8 with the adjustment solution after the polycondensation is completed, and heat up to 75°C, and then put 100% urea by weight into the enamel reactor to react;

[0045] 3) After the reaction in step 2), add 1% by weight of melamine and 3% by weight of phthalaldehyde, stir for 15 minutes, and distill under reduced pressure to recycle the obtained formaldehyde;

[0046] 4) After continuing to heat up to 85°C, keep warm for ten minutes and add 23% by weight of flame retardant, 8%...

Embodiment 2

[0052] 1) Put 450% by weight of formaldehyde solution into the enamel reaction kettle, adjust the pH value to be alkaline with the adjusting solution, then add 8% by weight of polyvinyl alcohol and 140% by weight of urea to the enamel reaction kettle , raise its temperature to 95°C, and react for 50min;

[0053] 2) After the reaction, add 30% by weight of methanol and 2% by weight of melamine after the enamel reactor cools down, adjust the pH value of the solution in the enamel reactor to 8.8 with the adjusting solution after the polycondensation is completed, and heat up to 80°C , then drop into 120% urea by weight in the enamel reactor to react;

[0054] 3) After the reaction in step 2), add 4% by weight of melamine and 5% by weight of phthalaldehyde, stir for 15-30min, distill under reduced pressure, and recycle the obtained formaldehyde;

[0055] 4) After continuing to heat up to 90°C, keep warm for ten minutes and add 35% by weight of flame retardant, 12% by weight of di...

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Abstract

The invention discloses a modified flame-retardant urea-formaldehyde resin adhesive for producing artificial boards and a preparation method of same. The resin glue comprises 2-5% of graphene, 200-260% of urea, 8-12% of diatom ooze, 320-450% of a formaldehyde aqueous solution, 2-6% of melamine, 8-12% of glutinous rice flour, 20-35% of cross-linked starch, 2-3% of sodium silicate, 1-4% of nano ceramic powder, 6-9% of polyurethane, 23-35% of a flame retardant, 3-8% of polyvinyl alcohol, 3-5% of o-phthalaldehyde, 10-30% of methanol and a regulation solution. The adhesive property of the resin adhesive is improved, the product is environmentally friendly, the comprehensive property is improved, free formaldehyde is reduced, the adhesive solution stability is high, the transparency of the adhesive solution is high, no mixed color exists, and the weather resistance is excellent.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a modified flame-retardant urea-formaldehyde resin adhesive for producing wood-based panels and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin adhesives are widely used in the production of wood-based panels, and its consumption accounts for more than 90% of the glue used in wood-based panels. It is the largest variety of wood-based panel adhesives. Urea-formaldehyde resin has incomparable advantages over other resins, mainly because it has sufficient raw materials and low price, which is the lowest price among synthetic resins. In addition, urea-formaldehyde resin also has many advantages, such as high bonding strength, rapid curing, light color of the cured adhesive layer, no pollution to the surface of the glued board, good water solubility, and easy adjustment to the required appropriate viscosity and concentration. . However, as we al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C09J103/02C09J103/04C09J175/04C09J11/04C08G12/40
CPCC08G12/40C08K2003/329C08K2003/387C08K2201/011C08L2201/02C09J11/04C09J161/32C08L3/02C08L3/04C08L75/04C08K13/04C08K3/042C08K3/00C08K3/34C08K7/26C08K3/38C08K3/32
Inventor 张渤涂怀刚
Owner 河南森远科技有限公司
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