CN114393663A - Preparation method of medium-density fiberboard - Google Patents
Preparation method of medium-density fiberboard Download PDFInfo
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- CN114393663A CN114393663A CN202210057666.5A CN202210057666A CN114393663A CN 114393663 A CN114393663 A CN 114393663A CN 202210057666 A CN202210057666 A CN 202210057666A CN 114393663 A CN114393663 A CN 114393663A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/08—Moulding or pressing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Forests & Forestry (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a preparation method of a medium-density fiberboard, which relates to the technical field of artificial board production and comprises the following operation steps: s1, pulping: carrying out hot grinding and cooking on wood fibers, carrying out hot grinding and defibering through a hot grinding machine to obtain wood fiber pulp, adding 1-1.5 mass percent of a waterproof agent, adding a melamine modified urea-formaldehyde resin adhesive and an ammonium chloride curing agent, and mixing and stirring to obtain mixed pulp; s2, drying: drying the obtained mixed slurry at 80-100 ℃ to prepare dry fibers; s3, blank forming: hot-pressing the dry fiber paved and formed slab at the pressure of 2-3Mpa and the temperature of 180-; s4, post-processing: and cutting edges of the formed board blank, and polishing to obtain the medium-density fiberboard. The invention has good waterproof performance, and the waterproof agent and the fiber form chemical connection, thereby improving the durability.
Description
Technical Field
The invention relates to the technical field of artificial boards, in particular to a preparation method of a medium-density fiberboard
Background
Fiberboard is one type of artificial board. They are roughly classified into hard density fiberboard, medium density fiberboard, soft fiberboard (low density fiberboard) and the like according to density. The fiber board is made by using wood fiber or other plant fiber as raw material, soaking wood, tree branch and other objects in water, crushing and pressing, and is an artificial board made by using wood fiber or other plant fiber as raw material, applying adhesive, and performing fiber separation, molding, hot pressing and other processes. The medium density board is required to have a certain waterproof function for use as interior materials, furniture and the like. Due to the large number of pores on the surface of the wood fiber, water molecules in the air are easily adsorbed in the fiber gaps in the humid air, causing dimensional change and deformation of the fiberboard. In order to improve the water resistance of the fiber board, a water-proofing agent is usually applied in the production of the fiber board, the commonly used water-proofing agent is a hydrophobic substance such as paraffin or rosin, and the water-proofing agent is adsorbed on the surface of the fiber, partially blocks the gaps of the fiber, cuts off a water transfer channel and plays a role in water resistance. However, the waterproof agent is a non-polar material, belongs to physical adsorption, has weak bonding strength, is easy to crack and fall off after being used for a period of time, or is easy to lose the waterproof effect after being contacted with water for a long time, has poor durability, and can influence the bonding performance of the fiberboard when the addition amount is too much.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a preparation method of a medium-density fiberboard, which has good waterproof performance, forms chemical connection between a waterproof agent and fibers and improves the durability.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a medium-density fiberboard comprises the following operation steps:
s1, pulping: carrying out hot grinding and cooking on wood fibers, carrying out hot grinding and defibering through a hot grinding machine to obtain wood fiber pulp, adding 1-1.5 mass percent of a waterproof agent, adding a melamine modified urea-formaldehyde resin adhesive and an ammonium chloride curing agent, and mixing and stirring to obtain mixed pulp;
s2, drying: drying the obtained mixed slurry at 80-100 ℃ to prepare dry fibers;
s3, blank forming: hot-pressing the dry fiber paved and formed slab at the pressure of 2-3Mpa and the temperature of 180-;
s4, post-processing: and cutting edges of the formed board blank, and polishing to obtain the medium-density fiberboard.
Further, 20-25 parts of emulsified paraffin, 10-15 parts of hydroxyl-terminated polydimethylsiloxane and 3-5 parts of silane coupling agent.
Further, the silane coupling agent is gamma-aminopropyltriethoxysilane.
Further, mixing and stirring gamma-aminopropyltriethoxysilane and an ethanol solution according to a mass ratio of 1: 20, adjusting the pH value to 4-5, dropwise adding water according to a molar ratio of the gamma-aminopropyltriethoxysilane to the water of 1: 2, heating to 75-80 ℃, reacting for 1-2 h, adjusting the pH value to 7, and removing low-boiling-point substances from a reaction mixture at a temperature of 80 ℃ and a vacuum degree of 0.1MPa to obtain a hydrolysate; and (3) putting the emulsified paraffin into a reaction kettle, stirring, raising the temperature to 90-100 ℃, adding the hydroxyl-terminated polydimethylsiloxane and the hydrolysate, and mixing and stirring to obtain the waterproof agent.
Further, the emulsified paraffin comprises the following raw materials in parts by weight: 100 parts of paraffin, 12 parts of stearic acid, 5 parts of ammonia water and 100 parts of water.
Further, the preparation method of the emulsified paraffin comprises the following steps: adding water, paraffin and stearic acid into an emulsifying tank according to a formula, heating until the paraffin is completely melted, heating to 88-92 ℃, stirring, simultaneously adding ammonia water, continuously stirring for 10-12min, and cooling to 50 ℃ for later use.
Furthermore, the addition amount of the melamine modified urea-formaldehyde resin adhesive is 10-12% of the total fiber weight, and the addition amount of the ammonium chloride is 1% of the melamine modified urea-formaldehyde resin adhesive weight.
Further, in the step S2, the moisture content of the dry fiber is controlled to 6 to 8%.
Compared with the prior art, the invention has the following beneficial effects:
the water-proofing agent is prepared from emulsified paraffin, hydroxyl-terminated polydimethylsiloxane and a silane coupling agent, the water absorption effect of a fiberboard is mainly due to the free hydroxyl in an undefined region of cellulose, a Si-OH-containing low molecular chain product generated by hydrolysis of the silane coupling agent is quickly permeated into fiber gaps, and the Si-OH in molecules is utilized to react with the hydroxyl on the surface of the fiber to enhance the bonding performance with the fiber, but the film-forming property is poor, and cavities are easy to appear on the surface; the hydroxyl-terminated polydimethylsiloxane is utilized to form a hydrophobic waterproof film, and the hydroxyl-terminated polydimethylsiloxane has a large molecular chain and is easy to form a good film, so that the hydroxyl-terminated polydimethylsiloxane is combined with a silane coupling agent to improve the film-forming property and the bonding property; however, the main chains of the hydroxyl-terminated polydimethylsiloxane and the silane coupling agent contain Si-O bonds with certain polarity, so that the waterproof film formed by the silica molecular chain still has certain air permeability and water permeability, and the waterproof performance is reduced; the hydrophobic property of the paraffin is utilized to isolate air and ensure the waterproof performance, and the hydroxyl polydimethylsiloxane and the silane coupling agent improve the film forming property and the adhesive force and improve the durability of the waterproof film.
Detailed Description
The following examples are provided to further illustrate the embodiments of the present invention.
Example 1
S1, pulping: carrying out hot grinding and cooking on wood fibers, carrying out hot grinding and defibrination through a hot grinding machine to obtain wood fiber pulp, adding 1% of a waterproof agent, adding a melamine modified urea-formaldehyde resin adhesive and an ammonium chloride curing agent, mixing and stirring to obtain mixed pulp, wherein the addition amount of the melamine modified urea-formaldehyde resin adhesive is 10% of the total fiber weight, and the addition amount of the ammonium chloride is 1% of the melamine modified urea-formaldehyde resin adhesive weight;
s2, drying: drying the obtained mixed slurry at 80-100 ℃ to prepare dry fibers, and controlling the water content of the dry fibers to be 6-8%;
s3, blank forming: hot-pressing the dry fiber paved and formed slab at the pressure of 2-3Mpa and the temperature of 180-;
s4, post-processing: and cutting edges of the formed board blank, and polishing to obtain the medium-density fiberboard.
The waterproof agent comprises the following raw materials in parts by weight: 20 parts of emulsified paraffin, 10 parts of hydroxyl-terminated polydimethylsiloxane and 3 parts of silane coupling agent. The silane coupling agent is gamma-aminolacto triethoxysilane.
Mixing and stirring gamma-aminopropyltriethoxysilane and an ethanol solution according to the mass ratio of 1: 20, adjusting the pH value to 4-5, dropwise adding water according to the molar ratio of the gamma-aminopropyltriethoxysilane to the water of 1: 2, heating to 75-80 ℃, reacting for 1-2 h, adjusting the pH value to 7, and removing low-boiling-point substances from a reaction mixture at the temperature of 80 ℃ and the vacuum degree of 0.1MPa to obtain a hydrolysate; and (3) putting the emulsified paraffin into a reaction kettle, stirring, raising the temperature to 90-100 ℃, adding the hydroxyl-terminated polydimethylsiloxane and the hydrolysate, and stirring to obtain the waterproof agent.
The emulsified paraffin comprises the following raw materials in parts by weight: 100 parts of paraffin, 12 parts of stearic acid, 5 parts of ammonia water and 100 parts of water.
The preparation method of the emulsified paraffin comprises the following steps: adding water, paraffin and stearic acid into an emulsifying tank according to a formula, heating until the paraffin is completely melted, heating to 88-92 ℃, stirring, simultaneously adding ammonia water, continuously stirring for 10-12min, and cooling to 50 ℃ for later use.
Example 2
S1, pulping: carrying out hot grinding and cooking on wood fibers, carrying out hot grinding and defibrination through a hot grinding machine to obtain wood fiber pulp, adding 1% of a waterproof agent, adding a melamine modified urea-formaldehyde resin adhesive and an ammonium chloride curing agent, mixing and stirring to obtain mixed pulp, wherein the addition amount of the melamine modified urea-formaldehyde resin adhesive is 10% of the total fiber weight, and the addition amount of the ammonium chloride is 1% of the melamine modified urea-formaldehyde resin adhesive weight;
s2, drying: drying the obtained mixed slurry at 80-100 ℃ to prepare dry fibers, and controlling the water content of the dry fibers to be 6-8%;
s3, blank forming: hot-pressing the dry fiber paved and formed slab at the pressure of 2-3Mpa and the temperature of 180-;
s4, post-processing: and cutting edges of the formed board blank, and polishing to obtain the medium-density fiberboard.
The waterproof agent comprises the following raw materials in parts by weight: 25 parts of emulsified paraffin, 10 parts of hydroxyl-terminated polydimethylsiloxane and 3 parts of silane coupling agent. The silane coupling agent is gamma-aminopropyl triethoxysilane.
The water repellent was prepared by the same method as in example 1.
The raw material parts by weight and the preparation method of the emulsified paraffin were the same as those of example 1.
Example 3
S1, pulping: carrying out hot grinding and cooking on wood fibers, carrying out hot grinding and defibrination through a hot grinding machine to obtain wood fiber pulp, adding 1% of a waterproof agent, adding a melamine modified urea-formaldehyde resin adhesive and an ammonium chloride curing agent, mixing and stirring to obtain mixed pulp, wherein the addition amount of the melamine modified urea-formaldehyde resin adhesive is 10% of the total fiber weight, and the addition amount of the ammonium chloride is 1% of the melamine modified urea-formaldehyde resin adhesive weight;
s2, drying: drying the obtained mixed slurry at 80-100 ℃ to prepare dry fibers, and controlling the water content of the dry fibers to be 6-8%;
s3, blank forming: hot-pressing the dry fiber paved and formed slab at the pressure of 2-3Mpa and the temperature of 180-;
s4, post-processing: and cutting edges of the formed board blank, and polishing to obtain the medium-density fiberboard.
The waterproof agent comprises the following components in parts by weight: 25 parts of emulsified paraffin, 15 parts of hydroxyl-terminated polydimethylsiloxane and 5 parts of silane coupling agent. The silane coupling agent is gamma-aminopropyl triethoxysilane.
The water repellent was prepared by the same method as in example 1.
The raw material parts by weight and the preparation method of the emulsified paraffin were the same as those of example 1.
Comparative example 1
Unlike example 3, the composition of the water repellent was only emulsified paraffin;
comparative example 2
Different from the embodiment 3, the composition of the waterproof agent comprises 25 parts of emulsified paraffin and 5 parts of silane coupling agent;
comparative example 3
The difference from example 3 is that the composition of the water repellent is 25 parts of emulsified paraffin and 15 parts of hydroxyl-terminated polydimethylsiloxane.
The fiberboards obtained in examples 1 to 3 and comparative examples 1 to 3 were tested in the medium density fiberboard of 2400X 2100X 8mm product, and the test results are shown in Table 1.
TABLE 1 test results of examples 1-3 and comparative examples 1-3
| Unit of | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Density of | kg/m3 | 837 | 832 | 834 | 828 | 832 | 833 |
| Internal bond strength | Mpa | 1.76 | 1.83 | 1.95 | 1.45 | 1.56 | 1.68 |
| Static bending strength | Mpa | 47.65 | 47.88 | 47.86 | 42.56 | 43.10 | 45.22 |
| 24H water absorption | ％ | 29.4 | 29.3 | 29.6 | 39.6 | 36.1 | 35.5 |
| Water absorption thickness expansion rate of 24H | ％ | 9.5 | 9.1 | 9.2 | 12.6 | 11.8 | 11.4 |
As can be seen from examples 1-3 and comparative example 1, the internal bonding strength, static bending strength, water absorption and water absorption thickness expansion rate of the waterproof agent product of the invention are all superior to the performance of the product adopting emulsified paraffin as the waterproof agent and the performance of the product adopting emulsified paraffin as the waterproof agent are equivalent, and the national standard of the mechanical property of the medium-density fiberboard is satisfied.
It can be seen from examples 3 to comparative example 2 that the water repellent of comparative example 2 is emulsified paraffin, a silane coupling agent, and the water repellency of the fiberboard is decreased. The silane coupling agent hydrolysate has small molecular chain capable of being filled into fiber gaps, and Si-0H in the hydrolysate is subjected to dehydration condensation with hydroxyl on the surface of the fiber, so that the waterproof agent has good binding performance, and the hydrophobic property of paraffin is combined to isolate air and improve the waterproof performance. However, the silane coupling agent hydrolysate has low molecular chain segment and poor film forming property, the water-proofing agent cannot fully cover all fiber surfaces, the fibers are easy to be exposed, and the paraffin is easy to contact with water for a long time to lose the water-proofing effect, so that the water-proofing property is reduced.
It can be seen from examples 3 to comparative example 3 that the water repellent of comparative example 3 is emulsified paraffin, hydroxy terminated polydimethylsiloxane, and the water repellency of the fiberboard is excellent, but the internal bonding strength performance is reduced. The hydroxyl-terminated polydimethylsiloxane has good film forming property, and the hydrophobic property of paraffin is combined by utilizing the combination of hydroxyl and hydroxyl on the surface of the fiber to isolate air, so that the waterproof property of the waterproof agent is ensured.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should be included in the claims of the present invention.
Claims (8)
1. The preparation method of the medium-density fiberboard is characterized by comprising the following operation steps:
s1, pulping: carrying out hot grinding and cooking on wood fibers, carrying out hot grinding and defibering through a hot grinding machine to obtain wood fiber pulp, adding 1-1.5 mass percent of a waterproof agent, adding a melamine modified urea-formaldehyde resin adhesive and an ammonium chloride curing agent, and mixing and stirring to obtain mixed pulp;
s2, drying: drying the obtained mixed slurry at 80-100 ℃ to prepare dry fibers;
s3, blank forming: hot-pressing the dry fiber paved and formed slab at the pressure of 2-3Mpa and the temperature of 180-;
s4, post-processing: and cutting edges of the formed board blank, and polishing to obtain the medium-density fiberboard.
2. The method for preparing the medium-density fiberboard of claim 1, wherein the water-proofing agent comprises the following raw materials in parts by weight: 20-25 parts of emulsified paraffin, 10-15 parts of hydroxyl-terminated polydimethylsiloxane and 3-5 parts of silane coupling agent.
3. The method of claim 2, wherein the silane coupling agent is γ -aminopropyltriethoxysilane.
4. The method for preparing a medium-density fiberboard of claim 3, wherein the method for preparing the waterproofing agent comprises the following steps: mixing and stirring gamma-aminopropyltriethoxysilane and an ethanol solution according to the mass ratio of 1: 20, adjusting the pH value to 4-5, dropwise adding water according to the molar ratio of the gamma-aminopropyltriethoxysilane to the water of 1: 2, heating to 75-80 ℃, reacting for 1-2 h, adjusting the pH value to 7, and removing low-boiling-point substances from a reaction mixture at the temperature of 80 ℃ and the vacuum degree of 0.1MPa to obtain a hydrolysate; and (3) putting the emulsified paraffin into a reaction kettle, stirring, raising the temperature to 90-100 ℃, adding the hydroxyl-terminated polydimethylsiloxane and the hydrolysate, and mixing and stirring to obtain the waterproof agent.
5. The method for preparing the medium-density fiberboard of claim 2, wherein the emulsified paraffin comprises the following raw materials in parts by weight: 100 parts of paraffin, 12 parts of stearic acid, 5 parts of ammonia water and 100 parts of water.
6. The method for preparing a medium density fiberboard of claim 5, wherein the emulsified paraffin is prepared by the following steps: adding water, paraffin and stearic acid into an emulsifying tank according to a formula, heating until the paraffin is completely melted, heating to 88-92 ℃, stirring, simultaneously adding ammonia water, continuously stirring for 10-12min, and cooling to 50 ℃ for later use.
7. The method for preparing the medium-density fiberboard of claim 1, wherein the melamine modified urea-formaldehyde resin adhesive is added in an amount of 10 to 12 percent of the total fiber weight, and the ammonium chloride is added in an amount of 1 percent of the melamine modified urea-formaldehyde resin adhesive.
8. The method as claimed in claim 1, wherein the dry fiber moisture content is controlled to 6-8% in step S2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115464740A (en) * | 2022-10-27 | 2022-12-13 | 湖南航天康达新材料有限公司 | Waterproof high-density fiberboard and preparation method thereof |
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