CN110894409A

CN110894409A - Modified phenolic resin adhesive for building template paper and preparation method thereof

Info

Publication number: CN110894409A
Application number: CN201811061169.2A
Authority: CN
Inventors: 施晓旦; 孙海强; 赵吉; 郑璐
Original assignee: Shanghai Changfa New Materials Co Ltd
Current assignee: Shanghai Changfa New Materials Co Ltd
Priority date: 2018-09-12
Filing date: 2018-09-12
Publication date: 2020-03-20

Abstract

The invention discloses a modified phenolic resin adhesive, which is prepared by using papermaking waste to replace part of phenol in the synthesis of phenolic resin, wherein the phenolic resin is prepared by condensation polymerization of phenol and formaldehyde, and the papermaking waste contains aromatic high polymer containing phenolic hydroxyl. The preparation method comprises the following steps: and (3) replacing part of phenol with papermaking waste, and performing polycondensation reaction with formaldehyde under the action of a catalyst to synthesize the modified phenolic resin adhesive. The invention adopts papermaking waste as a raw material to replace part of phenol to synthesize the modified phenolic resin adhesive, which is not only beneficial to ensuring the use times of the building template, but also beneficial to environmental protection and reducing the production cost.

Description

Modified phenolic resin adhesive for building template paper and preparation method thereof

Technical Field

The invention relates to the field of phenolic resin synthesis, in particular to a papermaking waste modified phenolic resin adhesive suitable for building template paper and a preparation method thereof.

Background

Wood plywood can be broadly divided into two categories: laminated wood plywood with the surface subjected to film coating treatment and plain wood plywood with the surface not subjected to film coating treatment. The main advantages of the wood plywood template are represented in the aspects of light weight, simple and convenient processing and forming, low manufacturing cost and the like. The wood plywood has better applicability and can be applied to template engineering of various building structures. However, the use condition of the wood-plywood in the current building engineering is not optimistic, the use turnover times of the wood-plywood are not large, and most of the wood-plywood can only be used for a plurality of times in a turnover mode and cannot be used any more. And the difference between the plywood and 10 new technologies in the building industry in China is great, and the plywood can be reused for 30-50 times. The existing wood plywood template used in large area in China has low quality and low efficiency.

The performance of the building template, which is a common building material in the modern building field, is mainly evaluated by the index of the using times of the building template. Some merchants use urea-formaldehyde glue in a large amount to reduce cost, so that the produced building templates have unqualified quality, and the demolding phenomenon occurs after the production is carried out for 3-5 times.

Disclosure of Invention

The invention aims to provide a modified phenolic resin adhesive, and a preparation method and application thereof, so as to solve the defects in the prior art.

The invention is realized by the following technical scheme:

the modified phenolic resin adhesive is prepared by using papermaking waste to replace part of phenol in the synthesis of phenolic resin, wherein the phenolic resin is prepared by condensation polymerization of phenol and formaldehyde, and the papermaking waste contains aromatic high polymer containing phenolic hydroxyl.

Preferably, the papermaking waste is at least one selected from the group consisting of sapropel, pulp residue, bark, waste liquid of chemicals, grass powder and siliceous white mud.

Preferably, the papermaking waste replaces 10 to 90 wt% of phenol.

The invention also provides a preparation method of the modified phenolic resin adhesive for the building template paper, which comprises the following steps: and (3) replacing part of phenol with papermaking waste, and performing polycondensation reaction with formaldehyde under the action of a catalyst to synthesize the modified phenolic resin adhesive.

The mass ratio of the papermaking waste to the phenol is 1:9-9:1, preferably 1:0.5-1: 2.

The molar ratio of the phenol to the formaldehyde is 1:0.5-1: 3.

The catalyst is an alkaline catalyst and is selected from at least one of barium hydroxide, calcium hydroxide, copper hydroxide, ferric hydroxide, sodium bicarbonate and sodium sulfite.

As a preferred technical scheme, the preparation method of the modified phenolic resin adhesive comprises the following steps: mixing paper-making waste, phenol, a catalyst and water, adding formaldehyde at 30-60 ℃ at one time, heating to 60-90 ℃ for polycondensation reaction, and cooling and discharging when the coating-4 cup viscosity of a reaction system reaches 13-17s to obtain the modified phenolic resin adhesive.

The amounts of the catalyst and water are conventional in the art and can be adjusted by those skilled in the art according to the actual reaction requirements.

The modified phenolic resin adhesive can be used as an adhesive for building template paper.

The invention adopts papermaking waste as a raw material to replace part of phenol to synthesize the modified phenolic resin adhesive, which is not only beneficial to ensuring the use times of the building template, but also beneficial to environmental protection, and the cost of the waste is far lower than that of phenol, thus having a certain effect on reducing the cost of phenolic resin synthesis.

Detailed Description

The modified phenolic resin adhesive is prepared by the following method:

a. adding papermaking waste, phenol, a catalyst and water into the bottom of a kettle, starting stirring to stabilize the temperature to 30-60 ℃, then adding all formaldehyde, stirring uniformly, heating a reaction system to 61-90 ℃, then automatically preserving heat, and controlling the fluctuation range of the temperature to be between plus and minus 6 ℃;

b, measuring the viscosity of the coating with 4 cups at 40 ℃ after 60-180min, and discharging if the viscosity reaches 13-17 s;

c. if the viscosity is not reached, continuously keeping the temperature until the viscosity reaches 13-17s, and cooling to below 40 ℃ for discharging.

The amounts of the components are as follows:

the invention is illustrated by the following specific examples, which are intended to be exemplary only and are not intended to be limiting.

Example 1

Raw material dosage: 47g of phenol, 105.86g of papermaking waste, 64.9g of formaldehyde, 33.3g of catalyst and 71.14g of water

1. Completely adding 105.86g of papermaking waste, 47g of phenol, 33.3g of catalyst and 71.14g of water into the bottom of a kettle, starting stirring to stabilize the temperature at 60 ℃, then adding 64.9g of formaldehyde, uniformly stirring, controlling the temperature of a reaction system at 70 ℃, automatically preserving heat, and controlling the fluctuation range of the temperature;

measuring the viscosity of the coating 4 cups at 40 ℃ after 2.170 min to reach 15s,

3. cooling to 25 ℃ and discharging.

Example 2

Raw material dosage: 47g of phenol, 105.86g of papermaking waste, 73g of formaldehyde, 33.3g of catalyst and 69.74g of water

1. Adding 105.86g of papermaking waste, 47g of phenol, 33.3g of catalyst and 69.74g of water into the bottom of a kettle, starting stirring to stabilize the temperature at 60 ℃, then adding 73g of formaldehyde, uniformly stirring, controlling the temperature of a reaction system at 70 ℃, automatically preserving heat, and controlling the fluctuation range of the temperature;

measuring the viscosity of the coating 4 cups at 40 ℃ after 2.180 min to reach 14s,

3. cooling to 25 ℃ and discharging.

Example 3

Raw material dosage: 47g of phenol, 105.86g of papermaking waste, 81.1g of formaldehyde, 36.1g of catalyst and 68.74g of water

1. Adding 105.86g of papermaking waste, 47g of phenol, 36.1g of catalyst and 68.74g of water into the bottom of a kettle, starting stirring to stabilize the temperature at 60 ℃, then adding 81.1g of formaldehyde, uniformly stirring, controlling the temperature of a reaction system at 70 ℃, automatically preserving heat, and controlling the fluctuation range of the temperature;

measuring the viscosity of the coating 4 cups at 40 ℃ after 2.180 min to reach 16s,

3. cooling to 25 ℃ and discharging.

Comparative example

Raw material dosage: 94g of phenol, 146g of formaldehyde, 36.1g of catalyst and 64.27g of water

1. Adding 94g of phenol, 36.1g of catalyst and 64.27g of water into the bottom of a kettle, starting stirring to stabilize the temperature at 60 ℃, then adding 146g of formaldehyde, uniformly stirring, controlling the temperature of a reaction system at 70 ℃, automatically preserving heat, and controlling the fluctuation range of the temperature;

measuring the viscosity of the coating 4 cups at 40 ℃ after 2.150 min to reach 15.1s,

3. cooling to 25 ℃ and discharging.

Application examples

The modified phenolic resin adhesives obtained in the examples and the comparative examples are made into coated paper under the same process, and then are pressed into a plate, and the repeated use condition of the laminated paper is tested. Specific results are shown in table 1.

TABLE 1

Detecting the index	Example 1	Example 2	Example 3	Comparative example
					Number of repeated use	12	10	11	10

Through experimental comparison, the modified phenolic resin adhesive synthesized by the invention is applied to building template paper, and has higher repeated use times. Is beneficial to environmental protection and obviously reduces the production cost.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The modified phenolic resin adhesive is characterized in that papermaking waste is used for replacing part of phenol in phenolic resin synthesis, the phenolic resin is synthesized by condensation polymerization of phenol and formaldehyde, and the papermaking waste contains aromatic high polymer containing phenolic hydroxyl.

2. The modified phenolic resin adhesive of claim 1, wherein the papermaking waste is at least one selected from the group consisting of sapropel, pulp residue, bark, waste chemical liquid, grass dust, and siliceous white mud.

3. The modified phenolic resin adhesive of claim 1, wherein the papermaking waste replaces 10 to 90 wt% of phenol.

4. The preparation method of the modified phenolic resin adhesive is characterized by comprising the following steps: the modified phenolic resin adhesive is synthesized by using papermaking waste to replace part of phenol and performing polycondensation reaction with formaldehyde under the action of a catalyst, wherein the papermaking waste contains aromatic high polymer containing phenolic hydroxyl.

5. The method of claim 4, wherein the mass ratio of the papermaking waste to phenol is from 1:0.5 to 1: 2.

6. The process of claim 4, wherein the molar ratio of phenol to formaldehyde is from 1:0.5 to 1: 3.

7. The method of claim 4, wherein the paper waste is selected from at least one of a slime, a sludge, a bark, a chemical waste, a grass dust, and a siliceous white mud.

8. The method of claim 4, wherein the catalyst is a basic catalyst selected from at least one of barium hydroxide, calcium hydroxide, copper hydroxide, iron hydroxide, sodium bicarbonate, and sodium sulfite.

9. The method according to any one of claims 4 to 8, comprising the steps of: mixing paper-making waste, phenol, a catalyst and water, adding formaldehyde at 30-60 ℃ at one time, heating to 60-90 ℃ for polycondensation reaction, and cooling and discharging when the coating-4 cup viscosity of a reaction system reaches 13-17s to obtain the modified phenolic resin adhesive.

10. The application of the modified phenolic resin adhesive as described in any one of claims 1-3, characterized in that the modified phenolic resin adhesive is used as an adhesive for building template paper.