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Preparation method of lignin-based resorcinol-phenol-formaldehyde resin adhesive

A technology based on resorcinol and formaldehyde resin, applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve problems such as long curing time, low lignin activity, and high curing temperature of phenolic resin problem, achieve the effect of lowering the curing temperature, simplifying the production process and improving the activity

Active Publication Date: 2017-08-29
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: The technical problem to be solved by this invention is to provide a preparation method of a lignin-based resorcinol-phenol-formaldehyde resin adhesive, which can solve the problem of low lignin activity and phenolic resin curing. Disadvantages such as high temperature and long curing time

Method used

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  • Preparation method of lignin-based resorcinol-phenol-formaldehyde resin adhesive
  • Preparation method of lignin-based resorcinol-phenol-formaldehyde resin adhesive

Examples

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Embodiment 1

[0028] The ratio of enzymatic lignin, phenol, formaldehyde and resorcinol in this example is: enzymatic lignin 47g, phenol 47g, formaldehyde aqueous solution 59g (37wt%), resorcinol aqueous solution 28g (28.6wt%) .

[0029] Step 1: Add 12g of sodium hydroxide into a 500ml four-necked flask filled with 70ml of water, raise the temperature to 70°C, first add 20g of enzymatic lignin, after it is completely dissolved, add 47g of phenol, and mix it evenly, then The remaining 27 g of enzymatic lignin was added, the temperature was raised to 90° C., and the reaction was incubated at 90° C. for 1 hour.

[0030] Step 2: Cool down to 80°C, add 20g of sodium hydroxide solution (20wt%) and 59g of formaldehyde solution (37wt%) into the reaction system at an appropriate speed, and keep the reaction at 80°C for 60min.

[0031] Step 3: lower the temperature to 65°C, add 28g of resorcinol aqueous solution (28.6wt%) to the reaction system, keep the reaction at 65°C for 120min, cool to room tem...

Embodiment 2

[0033] The ratio of enzymatic lignin, phenol, formaldehyde and resorcinol in this example is: enzymatic lignin 47g, phenol 47g, formaldehyde aqueous solution 59g (37wt%), resorcinol aqueous solution 32g (37.5wt%) .

[0034] Step 1: Add 12g of sodium hydroxide into a 500ml four-necked flask filled with 70ml of water, raise the temperature to 70°C, first add 20g of enzymatic lignin, after it is completely dissolved, add 47g of phenol, and mix it evenly, then The remaining 27 g of enzymatic lignin was added, the temperature was raised to 90° C., and the reaction was incubated at 90° C. for 1 hour.

[0035] Step 2: Cool down to 80°C, add 15g of sodium hydroxide solution (30wt%) and 59g of formaldehyde solution (37wt%) into the reaction system at an appropriate speed, and keep the reaction at 80°C for 60min.

[0036] Step 3: lower the temperature to 65°C, add 32g of resorcinol aqueous solution (37.5wt%) to the reaction system, keep the reaction at 65°C for 120min, cool to room tem...

Embodiment 3

[0038] The ratio of enzymatic lignin, phenol, formaldehyde and resorcinol in this embodiment is: enzymatic lignin 47g, phenol 47g, formaldehyde aqueous solution 59g (37wt%), resorcinol aqueous solution 32g (50wt%).

[0039] Step 1: Add 12g of sodium hydroxide into a 500ml four-necked flask filled with 70ml of water, raise the temperature to 70°C, first add 20g of enzymatic lignin, after it is completely dissolved, add 47g of phenol, and mix it evenly, then The remaining 27 g of enzymatic lignin was added, the temperature was raised to 90° C., and the reaction was incubated at 90° C. for 1 hour.

[0040] Step 2: Cool down to 80°C, add 15g of sodium hydroxide solution (30wt%) and 59g of formaldehyde solution (37wt%) into the reaction system at an appropriate speed, and keep the reaction at 80°C for 60min.

[0041] Step 3: lower the temperature to 65°C, add 32g of resorcinol aqueous solution (50wt%) to the reaction system, keep the reaction at 65°C for 120min, cool to room temper...

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Abstract

The invention discloses a preparation method of a lignin-based resorcinol-phenol-formaldehyde resin adhesive. The preparation method comprises dissolving a basic catalyst in water, heating the solution to 70 to 75 DEG C, adding lignin and phenol into the solution, carrying out uniform mixing, heating the mixture to 90-95 DEG C for a phenolization reaction for 1-1.5h, cooling the mixed solution to 70-85 DEG C, supplying a basic catalyst aqueous solution, adding a formaldehyde aqueous solution into the catalyst aqueous solution, carrying out a primary polycondensation reaction process at 70-85 DEG C for 45-60min, cooling the prepared solution to 55-65 DEG C, adding a resorcinol aqueous solution into the cooled solution, carrying out a secondary polycondensation reaction at 55-65 DEG C for 60-150min and cooling the product to the room temperature. The preparation method pretreats lignin through phenolization and improves phenolic hydroxyl group content of lignin. The preparation method utilizes high activity resorcinol. The lignin-based resorcinol-phenol-formaldehyde resin adhesive has a low curing temperature and short curing time.

Description

technical field [0001] The invention relates to the technical field of adhesive preparation, in particular to a preparation method of a lignin-based resorcinol-phenol-formaldehyde resin adhesive. Background technique [0002] Structural glulam is a kind of engineered wood formed by curing adhesives, which is one of the forms of modern wood structures. Structural glulam is the basic material for the construction of glulam structures, and plays an important role in wood structure construction. It has the following advantages: (1) Renewable raw materials, green and environmentally friendly; (2) Light in weight, easy to assemble and disassemble and transport; (3) High degree of industrialization and convenient construction; (4) Diversified design and functions; (5) Strong Corrosion resistance, so it can be widely used in wooden structure houses, large space structures and wooden bridges, towers and other building structures. [0003] At present, woodworking adhesives commonly ...

Claims

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Application Information

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IPC IPC(8): C08G8/28C08G8/22C08G8/10C09J161/14C08H7/00
CPCC09J161/14C08G8/10C08G8/22C08G8/28C08H6/00
Inventor 应汉杰蒋忠艳朱晨杰甘涛邓彤
Owner NANJING UNIV OF TECH
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