CN112063192A - Bamboo composite board preparation technology - Google Patents
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- CN112063192A CN112063192A CN202010908715.2A CN202010908715A CN112063192A CN 112063192 A CN112063192 A CN 112063192A CN 202010908715 A CN202010908715 A CN 202010908715A CN 112063192 A CN112063192 A CN 112063192A
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
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Abstract
The invention discloses a bamboo composite board preparation process; relates to the technical field of bamboo products, comprising the following steps: (1) preparing bamboo powder; (2) preparing a treatment solution; (3) carrying out primary vacuum treatment; (4) carrying out vacuum secondary treatment; (5) hot pressing; according to the invention, the bamboo powder is subjected to vacuum treatment by respectively adopting the treatment liquid a and the treatment liquid b, so that the bamboo powder can be obviously purified, the contents of polar compounds such as cork triterpene ketone, oleic acid, gamma-sitosterol, hexadecanoic acid, 2, 3-dihydrobenzofuran and the like in the bamboo powder are reduced by combining two treatments, and the internal tissue structure of the bamboo powder is greatly improved.
Description
Technical Field
The invention belongs to the technical field of bamboo products, and particularly relates to a bamboo composite board preparation process.
Background
The existing plate has poor compromise of strength, hardness, density and flatness, and low reuse rate. And the board is mostly made of solid wood boards or bamboo boards by pressing, the consumption of wood is large, and because a large amount of wooden boards are used, forest resources are deficient. Bamboo has a relatively short regeneration period and is superior to wood in both wood density and hydrophobicity, and thus bamboo boards are considered to be used instead of wood boards.
The bamboo wood has short growth cycle and strong reproducibility, is environment-friendly in the production and use processes, is an important forest resource next to wood, and has great significance for promoting social and economic development and ecological environment protection while effectively relieving contradiction between supply and demand of wood due to wide utilization of the bamboo wood in recent years.
Bamboo composite boards have been processed and applied, but the bamboo composite boards have relatively common performance due to the fact that interface bonding between bamboo and high polymer resin is relatively weak.
Disclosure of Invention
The invention aims to provide a bamboo composite board preparation process to solve the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a bamboo composite board preparation process comprises the following steps:
(1) preparing bamboo powder:
crushing bamboo wood to obtain bamboo powder, mixing the obtained bamboo powder with grinding fluid, then grinding for 2-3 hours, and then drying to obtain ground bamboo powder;
the grinding fluid is prepared by mixing organic alcohol, deionized water and tartrate;
(2) preparing a treatment solution:
preparation of a treatment liquid a:
sequentially adding ethanol, amide compounds and water together, and uniformly stirring to obtain a treatment solution a;
preparation of a treatment solution b:
mixing acetone and xylene together, and uniformly stirring to obtain a treatment solution b;
(3) carrying out vacuum primary treatment:
mixing the obtained ground bamboo powder and the treatment liquid a, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 55-60 ℃, adjusting the vacuum degree to 0.2-0.5Pa, keeping for 45-50min, taking out, filtering, and cleaning with clear water to obtain primary treated bamboo powder;
(4) and (3) vacuum secondary treatment:
mixing the obtained primary processed bamboo powder and the processing liquid b, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 75-80 ℃, adjusting the vacuum degree to 0.12-0.25Pa, keeping for 55-60min, taking out, filtering, and cleaning with clear water to obtain secondary processed bamboo powder;
(5) hot pressing:
mixing the secondary treatment bamboo powder and PVC resin particles together, then adding into a mould, carrying out hot press molding, keeping the pressure for 40min, and finally cooling and shaping to obtain the bamboo composite board.
The mixing ratio of the bamboo powder to the grinding fluid is 200 g: 200 and 250 mL.
The grinding fluid comprises the following components in parts by weight: 15:1.2.
The organic alcohol is formed by mixing ethanol and glycerol according to the mass ratio of 10: 1.
The tartrate is sodium tartrate.
The ethanol, the amide compound and the water are in parts by weight: 80-90:5-7:30-35.
The amide compound is 2, 4-dihydroxy benzamide.
The mixing mass ratio of the acetone to the dimethylbenzene is 2: 1.
The mixing mass ratio of the ground bamboo powder to the treatment liquid a is 1: 1;
the mixing mass ratio of the primary treated bamboo powder to the treating liquid b is 1: 1.
The hot pressing temperature is 170-178 ℃, and the hot pressing pressure is 12-15 MPa.
Has the advantages that:
the invention adopts the treatment liquid a and the treatment liquid b to carry out vacuum treatment on the bamboo powder respectively, can achieve obvious purification effect on the bamboo powder, reduces the content of polar compounds such as cork triterpene ketone, oleic acid, gamma-sitosterol, hexadecanoic acid, 2, 3-dihydrobenzofuran and the like in the bamboo powder through the combination of two treatments, greatly improves the internal organization structure of the bamboo powder, firstly has bonding reaction with the cell wall components of the bamboo powder due to the active groups such as high active hydrogen bond, carbonyl, carboxyl and the like in the polar compounds, and is bonded with the cell wall of the bamboo powder to block the bonding between the main components of the cell wall of the bamboo powder, and simultaneously prevents the bonding with the groups on the high molecular resin molecules to cause weak bonding between the bamboo powder and the high molecular resin molecules, and the bamboo powder is subjected to hot pressing after the treatment of the method of the invention, the internal bonding strength is greatly increased, the crystallinity is obviously improved, and the mechanical property of the bamboo composite board is greatly improved; after the treatment of the invention, the cell cavities, cell wall gaps, cell wall holes and the like of the bamboo powder are greatly increased, the mutual permeability between the bamboo powder and the high polymer resin is obviously increased, meanwhile, the cellulose crystallization area can be further crystallized under the condition of hot pressing, the plasticizing bonding effect between the cell walls of the bamboo powder is enhanced, the combination between the cell walls is tighter, and thus the mechanical property of the bamboo composite board is greatly increased.
Detailed Description
A bamboo composite board preparation process comprises the following steps:
(1) preparing bamboo powder:
crushing bamboo wood to obtain bamboo powder, mixing the obtained bamboo powder with grinding fluid, then grinding for 2-3 hours, and then drying to obtain ground bamboo powder;
the grinding fluid is prepared by mixing organic alcohol, deionized water and tartrate;
(2) preparing a treatment solution:
preparation of a treatment liquid a:
sequentially adding ethanol, amide compounds and water together, and uniformly stirring to obtain a treatment solution a;
preparation of a treatment solution b:
mixing acetone and xylene together, and uniformly stirring to obtain a treatment solution b;
(3) carrying out vacuum primary treatment:
mixing the obtained ground bamboo powder and the treatment liquid a, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 55-60 ℃, adjusting the vacuum degree to 0.2-0.5Pa, keeping for 45-50min, taking out, filtering, and cleaning with clear water to obtain primary treated bamboo powder;
(4) and (3) vacuum secondary treatment:
mixing the obtained primary processed bamboo powder and the processing liquid b, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 75-80 ℃, adjusting the vacuum degree to 0.12-0.25Pa, keeping for 55-60min, taking out, filtering, and cleaning with clear water to obtain secondary processed bamboo powder;
(5) hot pressing:
mixing the secondary treatment bamboo powder and PVC resin particles together, then adding into a mould, carrying out hot press molding, keeping the pressure for 40min, and finally cooling and shaping to obtain the bamboo composite board.
The mixing ratio of the bamboo powder to the grinding fluid is 200 g: 200 and 250 mL.
The grinding fluid comprises the following components in parts by weight: 15:1.2.
The organic alcohol is formed by mixing ethanol and glycerol according to the mass ratio of 10: 1.
The tartrate is sodium tartrate.
Sodium tartrate:
appearance and properties: colorless crystals or white crystal powder;
density: 1.818;
boiling point: 399.3 ℃ C at 760 mmHg;
flash point: c, 209.4 ℃;
storage conditions were as follows: ventilating, drying and sun-screening;
the ethanol, the amide compound and the water are in parts by weight: 80-90:5-7:30-35.
The amide compound is 2, 4-dihydroxy benzamide.
2, 4-dihydroxybenzamides
Density: 1.458g/cm3
Melting point: 228 ℃;
boiling point: 455.8 ℃ C at 760 mmHg;
flash point: 229.4 ℃ C;
refractive index: 1.664;
the mixing mass ratio of the acetone to the dimethylbenzene is 2: 1.
The mixing mass ratio of the ground bamboo powder to the treatment liquid a is 1: 1;
the mixing mass ratio of the primary treated bamboo powder to the treating liquid b is 1: 1.
The hot pressing temperature is 170-178 ℃, and the hot pressing pressure is 12-15 MPa.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A bamboo composite board preparation process comprises the following steps:
(1) preparing bamboo powder:
crushing bamboo wood to obtain bamboo powder, mixing the obtained bamboo powder with grinding fluid, then grinding for 2 hours, and then drying to obtain ground bamboo powder; the grinding fluid is prepared by mixing organic alcohol, deionized water and tartrate; the mixing ratio of the bamboo powder to the grinding fluid is 200 g: 200 mL. The grinding fluid comprises the following components in parts by weight: 15:1.2. The organic alcohol is formed by mixing ethanol and glycerol according to the mass ratio of 10: 1. The tartrate is sodium tartrate.
(2) Preparing a treatment solution:
preparation of a treatment liquid a:
sequentially adding ethanol, amide compounds and water together, and uniformly stirring to obtain a treatment solution a;
preparation of a treatment solution b: mixing acetone and xylene together, and uniformly stirring to obtain a treatment solution b; the ethanol, the amide compound and the water are in parts by weight: 80:5:30. The amide compound is 2, 4-dihydroxy benzamide. The mixing mass ratio of the acetone to the dimethylbenzene is 2: 1.
(3) Carrying out vacuum primary treatment:
mixing the obtained ground bamboo powder with the treatment liquid a, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 55 ℃, adjusting the vacuum degree to 0.2Pa, keeping for 45min, taking out, filtering, and cleaning with clear water to obtain primary treated bamboo powder; the mixing mass ratio of the ground bamboo powder to the treatment liquid a is 1: 1;
(4) and (3) vacuum secondary treatment:
mixing the obtained primary processed bamboo powder and the processing liquid b, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 75 ℃, adjusting the vacuum degree to 0.12Pa, keeping for 55min, taking out, filtering, and cleaning with clear water to obtain secondary processed bamboo powder; the mixing mass ratio of the primary treated bamboo powder to the treating liquid b is 1: 1.
(5) Hot pressing:
mixing the secondary treatment bamboo powder and PVC resin particles together, then adding into a mould, carrying out hot press molding, keeping the pressure for 40min, and finally cooling and shaping to obtain the bamboo composite board. The hot pressing temperature is 170 ℃, and the hot pressing pressure is 12 MPa.
Example 2
A bamboo composite board preparation process comprises the following steps:
(1) preparing bamboo powder:
crushing bamboo wood to obtain bamboo powder, mixing the obtained bamboo powder with grinding fluid, then grinding for 3 hours, and then drying to obtain ground bamboo powder; the grinding fluid is prepared by mixing organic alcohol, deionized water and tartrate; the mixing ratio of the bamboo powder to the grinding fluid is 200 g: 250 mL. The grinding fluid comprises the following components in parts by weight: 15:1.2. The organic alcohol is formed by mixing ethanol and glycerol according to the mass ratio of 10: 1. The tartrate is sodium tartrate.
(2) Preparing a treatment solution:
preparation of a treatment liquid a:
sequentially adding ethanol, amide compounds and water together, and uniformly stirring to obtain a treatment solution a;
preparation of a treatment solution b: mixing acetone and xylene together, and uniformly stirring to obtain a treatment solution b; the ethanol, the amide compound and the water are in parts by weight: 90:7:35. The amide compound is 2, 4-dihydroxy benzamide. The mixing mass ratio of the acetone to the dimethylbenzene is 2: 1.
(3) Carrying out vacuum primary treatment:
mixing the obtained ground bamboo powder and the treatment liquid a, adding into a vacuum impregnation reaction kettle, then adjusting the temperature to 60 ℃, adjusting the vacuum degree to 0.5Pa, then keeping for 50min, then taking out, filtering, and cleaning with clear water to obtain primary treated bamboo powder; the mixing mass ratio of the ground bamboo powder to the treatment liquid a is 1: 1;
(4) and (3) vacuum secondary treatment:
mixing the obtained primary processed bamboo powder and the processing liquid b, adding into a vacuum impregnation reaction kettle, then adjusting the temperature to 80 ℃, adjusting the vacuum degree to 0.25Pa, then keeping for 60min, then taking out, filtering, and cleaning with clear water to obtain secondary processed bamboo powder; the mixing mass ratio of the primary treated bamboo powder to the treating liquid b is 1: 1.
(5) Hot pressing:
mixing the secondary treatment bamboo powder and PVC resin particles together, then adding into a mould, carrying out hot press molding, keeping the pressure for 40min, and finally cooling and shaping to obtain the bamboo composite board. The hot pressing temperature is 178 ℃, and the hot pressing pressure is 15 MPa.
Example 3
A bamboo composite board preparation process comprises the following steps:
(1) preparing bamboo powder:
crushing bamboo to obtain bamboo powder, mixing the obtained bamboo powder with grinding fluid, grinding for 2.5 hours, and drying to obtain ground bamboo powder; the grinding fluid is prepared by mixing organic alcohol, deionized water and tartrate; the mixing ratio of the bamboo powder to the grinding fluid is 200 g: 220 mL. The grinding fluid comprises the following components in parts by weight: 15:1.2. The organic alcohol is formed by mixing ethanol and glycerol according to the mass ratio of 10: 1. The tartrate is sodium tartrate.
(2) Preparing a treatment solution:
preparation of a treatment liquid a:
sequentially adding ethanol, amide compounds and water together, and uniformly stirring to obtain a treatment solution a;
preparation of a treatment solution b: mixing acetone and xylene together, and uniformly stirring to obtain a treatment solution b; the ethanol, the amide compound and the water are in parts by weight: 83:6:32. The amide compound is 2, 4-dihydroxy benzamide. The mixing mass ratio of the acetone to the dimethylbenzene is 2: 1.
(3) Carrying out vacuum primary treatment:
mixing the obtained ground bamboo powder with the treatment liquid a, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 58 ℃, adjusting the vacuum degree to 0.3Pa, keeping for 47min, taking out, filtering, and cleaning with clear water to obtain primary treated bamboo powder; the mixing mass ratio of the ground bamboo powder to the treatment liquid a is 1: 1;
(4) and (3) vacuum secondary treatment:
mixing the obtained primary processed bamboo powder and the processing liquid b, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 78 ℃, adjusting the vacuum degree to 0.18Pa, keeping for 58min, taking out, filtering, and cleaning with clear water to obtain secondary processed bamboo powder; the mixing mass ratio of the primary treated bamboo powder to the treating liquid b is 1: 1.
(5) Hot pressing:
mixing the secondary treatment bamboo powder and PVC resin particles together, then adding into a mould, carrying out hot press molding, keeping the pressure for 40min, and finally cooling and shaping to obtain the bamboo composite board. The hot pressing temperature is 172 ℃, and the hot pressing pressure is 14 MPa.
Example 4
A bamboo composite board preparation process comprises the following steps:
(1) preparing bamboo powder:
crushing bamboo to obtain bamboo powder, mixing the obtained bamboo powder with grinding fluid, grinding for 2.5 hours, and drying to obtain ground bamboo powder; the grinding fluid is prepared by mixing organic alcohol, deionized water and tartrate; the mixing ratio of the bamboo powder to the grinding fluid is 200 g: 240 mL. The grinding fluid comprises the following components in parts by weight: 15:1.2. The organic alcohol is formed by mixing ethanol and glycerol according to the mass ratio of 10: 1. The tartrate is sodium tartrate.
(2) Preparing a treatment solution:
preparation of a treatment liquid a:
sequentially adding ethanol, amide compounds and water together, and uniformly stirring to obtain a treatment solution a;
preparation of a treatment solution b: mixing acetone and xylene together, and uniformly stirring to obtain a treatment solution b; the ethanol, the amide compound and the water are in parts by weight: 5:6:35. The amide compound is 2, 4-dihydroxy benzamide. The mixing mass ratio of the acetone to the dimethylbenzene is 2: 1.
(3) Carrying out vacuum primary treatment:
mixing the obtained ground bamboo powder with the treatment liquid a, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 60 ℃, adjusting the vacuum degree to 0.35Pa, keeping for 48min, taking out, filtering, and cleaning with clear water to obtain primary treated bamboo powder; the mixing mass ratio of the ground bamboo powder to the treatment liquid a is 1: 1;
(4) and (3) vacuum secondary treatment:
mixing the obtained primary processed bamboo powder and the processing liquid b, adding into a vacuum impregnation reaction kettle, then adjusting the temperature to 78 ℃, adjusting the vacuum degree to 0.22Pa, then keeping for 58min, then taking out, filtering, and cleaning with clear water to obtain secondary processed bamboo powder; the mixing mass ratio of the primary treated bamboo powder to the treating liquid b is 1: 1.
(5) Hot pressing:
mixing the secondary treatment bamboo powder and PVC resin particles together, then adding into a mould, carrying out hot press molding, keeping the pressure for 40min, and finally cooling and shaping to obtain the bamboo composite board. The hot pressing temperature is 175 ℃, and the hot pressing pressure is 13 MPa.
Test of
The same batch of bamboo powder is respectively treated by the methods in the examples and the comparative examples, then hot-pressed, and then the detection and comparison of the crystallinity of the cellulose are carried out;
TABLE 1
| Degree of crystallinity% | |
| Example 1 | 44.08 |
| Example 2 | 43.57 |
| Example 3 | 44.86 |
| Example 4 | 45.12 |
| Comparative example 1 | 39.36 |
| Blank control group | 36.27 |
Blank control group: untreated bamboo powder;
comparative example 1: replacing the treating fluid a and the treating fluid b in the example 1 with ethanol solution, wherein the mass ratio of ethanol to water is 80: 30;
as can be seen from Table 1, the treatment liquid a and the treatment liquid b are combined for vacuum treatment in the method, so that the crystallinity of the cellulose can be remarkably improved, the bamboo powder is contacted with each other more fully through the improvement of the crystallinity, hydrogen bonds in amorphous regions of the cellulose are reduced, and the mechanical property is remarkably enhanced.
The influence of different hot pressing temperatures on the crystallinity of the cellulose is compared by taking the example 4 as a basic sample;
TABLE 2
| Hot pressing temperature C | Degree of crystallinity% |
| 160 | 41.53 |
| 165 | 42.67 |
| 170 | 44.12 |
| 175 | 45.12 |
| 180 | 44.03 |
| 185 | 40.51 |
It can be seen from table 2 that, in the method of the present invention, the influence on the crystallinity of the cellulose in the bamboo powder is different due to the difference of the hot pressing temperature after the treatment of the bamboo powder, and the crystallinity of the cellulose gradually increases with the increase of the temperature within a certain range, and the cellulose continues to increase in temperature and decrease in temperature after exceeding a certain temperature, which is caused by the excessive pyrolysis of the cellulose due to the excessively high temperature.
And (3) detecting internal binding strength:
separately adding the secondary treated bamboo powder and the untreated bamboo powder obtained in the embodiment into a mould for hot pressing at 175 ℃, 15MPa and 40min, naturally cooling and shaping, and comparing the bonding strength in each group;
TABLE 3
| Internal bond strength/MPa | |
| Example 1 | 1.233 |
| Example 2 | 1.252 |
| Example 3 | 1.269 |
| Example 4 | 1.304 |
| Comparative example 1 | 1.015 |
| Blank control group | 0.756 |
Comparative example 1: replacing the treating fluid a and the treating fluid b in the example 1 with ethanol solution, wherein the mass ratio of ethanol to water is 80: 30;
as can be seen from table 3, the internal bonding strength in the reheat pressing process is greatly increased after the treatment of the bamboo powder in the method of the present invention, because the internal interference factors of the treated bamboo powder are greatly reduced under the reheat pressing, the pyrolysis of the internal components is enabled to generate more active groups, and meanwhile, the bamboo powder shows stronger thermoplasticity, the bonding between the bamboo powders is tighter under the action of the pressure, so that various chemical bonds are formed, and the internal bonding strength is greatly increased.
And (3) detecting internal binding strength:
the sample is taken as the basic sample of example 4;
independently adding the obtained secondary treated bamboo powder and untreated bamboo powder into a mould for hot pressing treatment, wherein the hot pressing pressure is 15MPa, the pressure maintaining time is 40min, naturally cooling and shaping are carried out, and then the hot pressing temperature is compared with the bonding strength in each group;
TABLE 4
| Hot pressing temperature C | Internal bond strength/MPa |
| 160 | 1.271 |
| 165 | 1.286 |
| 170 | 1.294 |
| 175 | 1.304 |
| 180 | 1.290 |
| 185 | 1.270 |
It can be seen from table 4 that, as the hot pressing temperature increases, the bonding strength in the bamboo powder gradually increases, and when the temperature exceeds a certain temperature range, the hot pressing temperature continues to increase, and the internal bonding strength decreases.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (10)
1. The preparation process of the bamboo composite board is characterized by comprising the following steps of:
(1) preparing bamboo powder:
crushing bamboo wood to obtain bamboo powder, mixing the obtained bamboo powder with grinding fluid, then grinding for 2-3 hours, and then drying to obtain ground bamboo powder;
the grinding fluid is prepared by mixing organic alcohol, deionized water and tartrate;
(2) preparing a treatment solution:
preparation of a treatment liquid a:
sequentially adding ethanol, amide compounds and water together, and uniformly stirring to obtain a treatment solution a;
preparation of a treatment solution b:
mixing acetone and xylene together, and uniformly stirring to obtain a treatment solution b;
(3) carrying out vacuum primary treatment:
mixing the obtained ground bamboo powder and the treatment liquid a, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 55-60 ℃, adjusting the vacuum degree to 0.2-0.5Pa, keeping for 45-50min, taking out, filtering, and cleaning with clear water to obtain primary treated bamboo powder;
(4) and (3) vacuum secondary treatment:
mixing the obtained primary processed bamboo powder and the processing liquid b, adding into a vacuum impregnation reaction kettle, adjusting the temperature to 75-80 ℃, adjusting the vacuum degree to 0.12-0.25Pa, keeping for 55-60min, taking out, filtering, and cleaning with clear water to obtain secondary processed bamboo powder;
(5) hot pressing:
mixing the secondary treatment bamboo powder and PVC resin particles together, then adding into a mould, carrying out hot press molding, keeping the pressure for 40min, and finally cooling and shaping to obtain the bamboo composite board.
2. The bamboo composite board preparation process of claim 1, characterized in that: the mixing ratio of the bamboo powder to the grinding fluid is 200 g: 200 and 250 mL.
3. The bamboo composite board preparation process of claim 2, characterized in that: the grinding fluid comprises the following components in parts by weight: 15:1.2.
4. The bamboo composite board preparation process of claim 3, characterized in that: the organic alcohol is formed by mixing ethanol and glycerol according to the mass ratio of 10: 1.
5. The bamboo composite board preparation process according to claim 3, characterized in that: the tartrate is sodium tartrate.
6. The bamboo composite board preparation process of claim 1, characterized in that: the ethanol, the amide compound and the water are in parts by weight: 80-90:5-7:30-35.
7. The bamboo composite board preparation process of claim 6, characterized in that: the amide compound is 2, 4-dihydroxy benzamide.
8. The bamboo composite board preparation process of claim 1, characterized in that: the mixing mass ratio of the acetone to the dimethylbenzene is 2: 1.
9. The bamboo composite board preparation process of claim 1, characterized in that: the mixing mass ratio of the ground bamboo powder to the treatment liquid a is 1: 1;
the mixing mass ratio of the primary treated bamboo powder to the treating liquid b is 1: 1.
10. The bamboo composite board preparation process of claim 1, characterized in that: the hot pressing temperature is 170-178 ℃, and the hot pressing pressure is 12-15 MPa.
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|---|---|---|---|---|
| CN114953078A (en) * | 2022-07-04 | 2022-08-30 | 南京林业大学 | Preparation method of bamboo composite material, product and application thereof |
| CN114953078B (en) * | 2022-07-04 | 2023-08-25 | 南京林业大学 | Preparation method of bamboo composite material, product and application thereof |
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Application publication date: 20201211 |