CN114351503A - Latex for waterproof abrasive paper and using method thereof - Google Patents
Latex for waterproof abrasive paper and using method thereof Download PDFInfo
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Abstract
The invention claims a latex for waterproof abrasive paper with high tensile strength, folding resistance and lyophobic performance and a using method thereof. The latex components were as follows: aqueous polyurethane emulsion: 30-50 parts of curing agent: 0.1-0.5 part of release agent: 1-3 parts of water: 100 parts. The waterproof abrasive paper latex prepared by the method is safe and environment-friendly, has small particle size, small molecular weight and moderate viscosity, and can well permeate into paper, and the waterproof abrasive paper latex is prepared by adopting the Sasa albo-marginata nano cellulose and sucrose fatty acid ester to synergistically modify the polyurethane latex. The performance of the abrasive paper base material obtained by carrying out twice impregnation and hot pressing on the base paper is more excellent, and the base paper is more suitable for subsequent abrasive paper processing.
Description
Technical Field
The invention relates to latex for waterproof abrasive paper and a using method thereof, belonging to the technical field of papermaking additives.
Background
The waterproof abrasive paper is widely used for grinding and polishing the surfaces of various paint surfaces in the furniture industry; grinding and polishing the processes before and after the paint spraying of automobile repair and automobile production; polishing jewelry and metal products. With the rapid increase of the yield of the automobile manufacturing industry, the requirement on high-quality waterproof abrasive paper is higher and higher, and the market prospect of the carrier base material (base paper of the abrasive paper) of the high-quality waterproof abrasive paper is also seen by the paper making industry. Waterproof abrasive paper base paper is mainly divided into two types: firstly, kraft paper is used for forming a water-resistant layer by resin surface infiltration, so that a waterproof effect is achieved; firstly, latex paper, as base paper for producing high-quality sand paper, is required to have strong water resistance, oil resistance, folding strength and tensile strength.
Under the condition of not changing the paper making of the base paper, the prior production process mostly adopts latex to carry out dipping or surface coating treatment on the base paper of the sand paper so as to endow the base paper with water resistance, oil resistance and high folding resistance. For example, in Liu Hua and the like (paper and papermaking, 6 months in 2014, 6 th in 34 rolls), styrene-acrylic latex is adopted to perform surface treatment on the sand paper in a surface coating mode, so that the solvent resistance and flexibility of the sand paper are improved, and the oil resistance and the mechanical property of the base paper of the sand paper are improved by coating polyvinyl alcohol (PVA)/nano microfibril (NFC) composite coating in Wang Xiyun and the like (Chinese paper industry, 3 months in 2019, 6 th in 40 rolls). Guo Yougui (CN102191725B) adopts the compound glue of ethylene-vinyl acetate, chloroprene, zinc oxide and AKD to dip the base paper, adopts the compound glue of polyvinyl alcohol, styrene-butadiene and polyurethane to coat the surface of the base paper after drying, and adopts the compound glue of oxidized starch and nonionic stripper to back coat the base paper, thus obtaining the base paper of sand paper with excellent water resistance, oil resistance, folding resistance, tensile strength and the like. On the premise of unchanged body paper performance, the performance of the impregnation glue solution and the coating glue solution of the body paper determines the final use performance of the sand paper body paper, in the existing research, the body paper is subjected to coating treatment only, the liquid repellent performance of the body paper is still enough, but the improvement effect on the physical strength of the body paper is not great, and particularly the folding resistance (the coating thickness is limited); the surface coating and the impregnation treatment of the base paper can improve the base paper deeply, but most of the existing impregnation glue solution is simple compounding of several functional substances, and the synergistic effect is not obvious.
Therefore, it is necessary to prepare an emulsion which combines the 'deep treatment' and surface properties of the base paper and provide a using method thereof, and to improve the liquid repellency, folding strength and comprehensive properties of the base paper of the sand paper.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of the latex for the waterproof abrasive paper, aiming at the defects in the prior art, so that the physical strength of the waterproof abrasive paper meets the relevant national standard requirements. The components comprise the following components in percentage by mass:
aqueous polyurethane emulsion: 30-50 parts of
Curing agent: 0.1 to 0.5 portion
Releasing agent: 1-3 parts of
Water: 100 parts.
Specifically, the curing agent is one or two of isocyanate TDI and MDI. The release agent is one or two of organic chlorosilane or organic alkoxy silane.
The formula of the waterborne polyurethane emulsion comprises: the molar ratio of the dihydric alcohol to the diisocyanate is 0.8-1.5, the molar part of the dihydric alcohol is 30-50, the chain extender is 2-5, the hydrophilic agent is 3-8, the TEMPO oxidation arrowhead nano-cellulose is 2-8, the sucrose fatty acid ester is 1-5, the glacial acetic acid is 0.1-1, and the water is 50-80.
More specifically, the dihydric alcohol comprises one or more of polyester dihydric alcohol and polyether dihydric alcohol which do not contain aliphatic rings and aromatic rings. The diisocyanate comprises one or more of isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI) and Lysine Diisocyanate (LDI). The chain extender is one of ethylene glycol, propylene glycol, 1, 4-butanediol, diethylene glycol and 1, 4-cyclohexanediol. The hydrophilic agent is one of dimethylolpropionic acid (DMPA) or dimethylolbutyric acid (DMBA).
The nano-cellulose is Sasa albo-marginata nano-cellulose prepared by a TEMPO method, the solid content is 0.5-2%, and the particle size is 200-800 nm. The Sasa Sagittifolia Vahl fiber has larger size and physical strength than the fiber of common wood and bamboo, participates in reaction in the preparation process of polyurethane, and plays roles of skeleton connection and resin reinforcement.
The sucrose fatty acid ester is one or more of fatty acid monoester, fatty acid diester and fatty acid triester, and plays a role in emulsifying and reacting with the nano-cellulose to generate hydrophobic and oleophobic components.
The preparation method of the aqueous polyurethane emulsion latex comprises the following steps:
1) preparing a Sasa albo-marginata nano cellulose/sucrose fatty acid ester mixed solution: mixing measured Sasa albo-marginata nano-cellulose and sucrose fatty acid ester, and stirring at a speed of about 1500r/min for half an hour.
2) Adding dihydric alcohol and diisocyanate into a reaction kettle with a stirring and refluxing device according to a certain proportion, and carrying out prepolymerization reaction under the protection of high-purity nitrogen at the reaction temperature of 45-55 ℃ for 0.3-0.5h to obtain the polyurethane prepolymer.
3) Heating the prepolymer to 70-80 ℃, respectively dropwise adding a chain extender and a Sasa sagittifolia nano-cellulose/sucrose fatty acid ester mixed solution into the prepolymer, wherein the dropwise adding time of the chain extender is 10-20min, the chain extension reaction time is 0.5-1.5h, the dropwise adding time of the nano-cellulose is 20-30min, and the stirring speed is 50-100 r/min. Then cooling to 40-60 ℃, adding the hydrophilic agent, and finishing the addition within 30min, wherein the reaction time is 0.5-1.5 h.
4) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity and shearing at high speed, wherein the shearing speed is 3000-.
5) The latex for the waterproof abrasive paper comprises the following components in parts by mass:
aqueous polyurethane emulsion: 30-50 parts of
Curing agent: 0.1 to 0.5 portion
Releasing agent: 1-3 parts of
Water: 100 parts.
According to the formula proportion, simultaneously adding the waterborne polyurethane emulsion, the curing agent and the release agent into a container, stirring at 200r/min for 10min, and standing to obtain the latex for the waterproof abrasive paper. The solid content of the latex is 25-30%, the particle diameter is 50-100nm, the viscosity is 30-80cp, and the molecular weight is 500-1500.
Dipping the base paper by adopting the latex for 1-2min, drying at low temperature to surface dryness (40-60 ℃), dipping for 2-3min, drying at 90-110 ℃), and hot pressing (120-; and testing the relevant physical properties of the latex-type waterproof sand paper base paper according to the industrial standards of JB/T7499-.
The invention has the following advantages:
1) when preparing the aqueous polyurethane emulsion, selecting specific reaction conditions as follows: for example, the polyurethane emulsion obtained by the specific stirring speed and the short reaction time has small particle size, small molecular weight and moderate viscosity, so that the prepared latex component can well permeate into paper, and the water-resistant sand paper can be soaked more fully and deeply.
2) The Sasa albo-marginata nano-cellulose is introduced in the chain extension reaction stage and can participate in the generation reaction of polyurethane, and because the Sasa albo-marginata fiber has larger size and larger physical strength than the fiber of common wood and bamboo, the finally obtained latex adhesive film for base paper impregnation has excellent tensile and folding resistance, and the waterproof sand paper base paper also has corresponding performance.
3) The sucrose fatty acid ester is added into the Sasa albo-marginata nano-cellulose, so that the polyurethane can be better dispersed in solvent water in a high-speed shearing and dispersing mode, and within a certain concentration range, the sucrose fatty acid ester can enable the nano-cellulose modified polyurethane material to show better hydrophobicity and oleophobicity, and the wet tensile strength of the latex is improved to a certain degree. The synergistic effect brought by the synergistic reaction of the water-resistant abrasive paper and the polyurethane is beneficial to greatly improving the folding resistance and the tensile strength of the water-resistant abrasive paper base paper.
4) The latex is adopted to carry out dipping-low temperature drying to surface drying-dipping-drying) -hot pressing treatment on the water-resistant abrasive paper base paper, the sizing amount of the water-resistant abrasive paper base paper is larger, the latex is in solid distribution in the paper and on the surface, and the performances of the base paper, including tensile strength, folding resistance and hydrophobic and oleophobic performances, are improved from inside to outside.
Detailed Description
Example 1
1) Preparing a Sasa albo-marginata nano cellulose/sucrose fatty acid ester mixed solution: 2 parts by weight of Sasa albo-marginata nanocellulose and 1 part by weight of fatty acid monoester are mixed and stirred for half an hour at a speed of about 1500 r/min.
2) Adding polyethylene glycol (molecular weight 200) and isophorone diisocyanate into a reaction kettle with a stirring and refluxing device according to a molar ratio of 0.8, and carrying out prepolymerization reaction at 45 ℃ for 0.3h under the protection of high-purity nitrogen to obtain a polyurethane prepolymer.
3) Heating the prepolymer to 70 ℃, dropwise adding 1, 4-butanediol into the prepolymer for 10min, dropwise adding the Sasa albo-marginata nano-cellulose/mono-fatty acid ester mixed solution for 20min, performing chain extension reaction for 1.5h, and stirring at a speed of 50 r/min. Then the temperature is reduced to 40 ℃, the hydrophilic agent is added, the addition is completed within 30min, and the reaction time of the step is 0.5 h.
4) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity, carrying out high-speed shearing at the shearing speed of 3000r/min, and evaporating and removing the acetone to obtain the aqueous polyurethane emulsion.
5) The latex for the waterproof abrasive paper comprises the following components in parts by mass:
aqueous polyurethane emulsion: 30 portions of
Curing agent: 0.1 part
Releasing agent: 1 part of
Water: 100 parts.
According to the formula proportion, simultaneously adding the waterborne polyurethane emulsion, the curing agent and the release agent into a container, stirring at 200r/min for 10min, and standing to obtain the latex for the waterproof abrasive paper. Dipping the base paper by using the latex for 1min, drying at low temperature to surface dryness (40 ℃), dipping (2min), drying (90 ℃), and hot pressing (120 ℃, 6Mpa pressure for 0.5min) to obtain waterproof sand paper base paper; the relevant physical properties of the latex-type waterproof sand paper base paper are tested according to the industrial standards of JB/T7499 and QB/T1312 and 2018.
Example 2
1) Preparing a Sasa albo-marginata nano cellulose/sucrose fatty acid ester mixed solution: mixing 8 parts by weight of Sasa albo-marginata nano-cellulose and 5 parts by weight of double fatty acid ester, and stirring at a speed of about 1500r/min for half an hour.
2) Adding polyester diol CMA-1024 and isophorone diisocyanate into a reaction kettle with a stirring and refluxing device according to the molar ratio of 1.5, and carrying out prepolymerization reaction at the reaction temperature of 55 ℃ for 0.5h under the protection of high-purity nitrogen to obtain a polyurethane prepolymer.
3) Heating the prepolymer to 80 ℃, dropwise adding ethylene glycol into the prepolymer for 10min, dropwise adding the Sasa albo-marginata nano-cellulose/double fatty acid ester mixed solution for 30min, carrying out chain extension reaction for 0.5h, and stirring at a speed of 100 r/min. Then the temperature is reduced to 60 ℃, the hydrophilic agent is added, the addition is finished within 30min, and the reaction time of the step is 1.5 h.
4) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity, performing high-speed shearing at the shearing speed of 5000r/min, and evaporating and removing the acetone to obtain the aqueous polyurethane emulsion.
5) The latex for the waterproof abrasive paper comprises the following components in parts by mass:
aqueous polyurethane emulsion: 50 portions of
Curing agent: 0.5 portion
Releasing agent: 3 portions of
Water: 100 parts.
According to the formula proportion, simultaneously adding the waterborne polyurethane emulsion, the curing agent and the release agent into a container, stirring at 200r/min for 10min, and standing to obtain the latex for the waterproof abrasive paper. Dipping the base paper by using the latex for 2min, drying at low temperature to surface dryness (60 ℃), dipping for 3min, drying at 110 ℃), and hot pressing (140 ℃, 6Mpa pressure for 0.5min) to obtain water-resistant sand paper base paper; the relevant physical properties of the latex-type waterproof sand paper base paper are tested according to the industrial standards of JB/T7499 and QB/T1312 and 2018.
Example 3
1) Preparing a Sasa albo-marginata nano cellulose/sucrose fatty acid ester mixed solution: 5 parts by weight of Sasa albo-marginata nano-cellulose and 3 parts by weight of fatty acid triester are mixed and stirred for half an hour at a speed of about 1500 r/min.
2) Polyester diol CMA-1024, polyethylene glycol (the molar ratio of the two is 1: 1) adding the mixture and hexamethylene diisocyanate into a reaction kettle with a stirring and refluxing device according to the molar ratio of 1.3, and carrying out prepolymerization reaction under the protection of high-purity nitrogen at the reaction temperature of 50 ℃ for 0.7h to obtain the polyurethane prepolymer.
3) Heating the prepolymer to 75 ℃, dropwise adding propylene glycol into the prepolymer for 15min, dropwise adding the Sasa albo-marginata nano-cellulose/fatty acid triester mixed solution for 25min, chain extension reaction for 0.8h, and stirring at a speed of 80 r/min. Then cooling to 50 ℃, adding the hydrophilic agent, and finishing the addition within 30min, wherein the reaction time is 1 h.
4) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity, shearing at high speed with the shearing speed of 4000r/min, and evaporating to remove acetone to obtain the aqueous polyurethane emulsion.
5) The latex for the waterproof abrasive paper comprises the following components in parts by mass:
aqueous polyurethane emulsion: 40 portions of
Curing agent: 0.3 part
Releasing agent: 2 portions of
Water: 100 parts.
According to the formula proportion, simultaneously adding the waterborne polyurethane emulsion, the curing agent and the release agent into a container, stirring at 200r/min for 10min, and standing to obtain the latex for the waterproof abrasive paper. Dipping the base paper by using the latex for 90s, drying at low temperature to surface dryness (50 ℃), dipping (2.5min), drying (100 ℃), and hot pressing (130 ℃, 4Mpa pressure for 1min) to obtain waterproof sand paper base paper; (ii) a The relevant physical properties of the latex-type waterproof sand paper base paper are tested according to the industrial standards of JB/T7499 and QB/T1312 and 2018.
Comparative example 1
The difference from the technical scheme of the example 1 is that the arrowroot nano-cellulose and the sucrose fatty acid ester are not added.
Comparative example 2
The difference from the technical scheme of example 1 is that 2 parts by weight and 1 part by weight of sucrose fatty acid ester are added into the common nano-cellulose.
Comparative example 3
The difference from the technical scheme of the example 1 is that 3 parts by weight of Sasa albo-marginata nano cellulose is added, and sucrose fatty acid ester is not added.
Comparative example 4
The difference from the technical scheme of the embodiment 1 is that 3 parts by weight of sucrose fatty acid ester is added, and the Sasa albo-marginata nanocellulose is not added.
Performance testing
TABLE 1 latex Properties
| Adhesive a | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Example 1 | |
| Particle size/nm | 500 | 70 | 80 | 70 | 80 | 60 |
| Solid content/wt% | 30 | 30 | 32 | 30 | 28 | 30 |
| Viscosity/cp | 100 | 160 | 60 | 50 | 80 | 70 |
| Average molecular weight | 30000 | 1000 | 900 | 1000 | 900 | 800 |
a.CN102191725B
Compared with the published water-resistant base paper latex for sand paper, the impregnated latex prepared by the invention has smaller particle size and smaller molecular weight under similar solid content conditions, which is beneficial to the penetration of latex particles in paper.
TABLE 2 comparison of physical Properties of Water-resistant base paper for sandpaper
Cn102191725b test reference standard: JB/T7499-
The invention adopts the Sasa albo-marginata nano cellulose and sucrose fatty acid ester to synergistically modify the polyurethane latex, and the sandpaper base paper subjected to twice dipping treatment by the latex has better dry/wet tensile strength, tearing strength, folding resistance and lyophobicity compared with the published base paper subjected to latex treatment, and meets the requirements of related national high-class standards. The performance of the abrasive paper base material obtained by carrying out twice impregnation and hot pressing on the base paper is more excellent, and the base paper is more suitable for subsequent abrasive paper processing.
Claims (9)
1. The latex for the waterproof abrasive paper is characterized by comprising the following components in parts by mass:
aqueous polyurethane emulsion: 30-50 parts of
Curing agent: 0.1 to 0.5 portion
Releasing agent: 1-3 parts of
Water: 100 parts.
2. The latex for waterproof abrasive paper as claimed in claim 1, wherein the aqueous polyurethane emulsion is prepared from the following raw materials: the molar ratio of the dihydric alcohol to the diisocyanate is 0.8-1.5, the molar part of the dihydric alcohol is 30-50, the molar part of the chain extender is 2-5, the molar part of the hydrophilic agent is 3-8, the weight of the TEMPO oxidized arrowhead nano-cellulose is 2-8, the weight of the sucrose fatty acid ester is 1-5, the weight of the glacial acetic acid is 0.1-1 and the weight of the water is 50-80.
3. The latex for waterproof abrasive paper as claimed in claim 2, wherein the diisocyanate comprises one or more of isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), Hexamethylene Diisocyanate (HDI), and Lysine Diisocyanate (LDI).
4. The latex for water-resistant sandpaper as claimed in claim 2, wherein the chain extender is one of ethylene glycol, propylene glycol, 1, 4-butanediol, diethylene glycol, and 1, 4-cyclohexanediol.
5. The latex for water-resistant sandpaper as defined in claim 2, wherein the hydrophilic agent is one of dimethylolpropionic acid (DMPA) or dimethylolbutyric acid (DMBA).
6. The latex for water-resistant sandpaper as claimed in claim 2, wherein the nanocellulose is Sasa albo-marginata nanocellulose prepared by TEMPO method, the solid content is 0.5% -2%, and the particle size is 200-800 nm.
7. The latex for water-resistant sandpaper as claimed in claim 2, wherein said sucrose fatty acid ester is one or more of mono-fatty acid ester, di-fatty acid ester and tri-fatty acid ester, and functions to emulsify and react with nanocellulose to form hydrophobic and oleophobic ingredient.
8. A method of preparing the latex for waterproof abrasive paper according to any one of claims 1 to 7, comprising the steps of:
1) preparing a Sasa albo-marginata nano cellulose/sucrose fatty acid ester mixed solution: mixing measured Sasa albo-marginata nano-cellulose and sucrose fatty acid ester, and stirring at a speed of about 1500r/min for half an hour for later use;
2) adding dihydric alcohol and diisocyanate into a reaction kettle with a stirring and refluxing device according to a ratio, and carrying out prepolymerization reaction under the protection of high-purity nitrogen at the reaction temperature of 45-55 ℃ for 0.3-0.5h to obtain a polyurethane prepolymer;
3) heating the prepolymer to 70-80 ℃, respectively dropwise adding a chain extender and a Sasa sagittifolia nano-cellulose/sucrose fatty acid ester mixed solution into the prepolymer, wherein the dropwise adding time of the chain extender is 10-20min, the chain extension reaction time is 0.5-1.5h, the dropwise adding time of the nano-cellulose is 20-30min, and the stirring speed is 50-100 r/min. Then cooling to 40-60 ℃, adding a hydrophilic agent, and finishing the addition within 30min, wherein the reaction time of the step is 0.5-1.5 h;
4) cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously using a proper amount of acetone for viscosity reduction, adding water after proper viscosity and shearing at a high speed of 3000-;
5) the latex for the waterproof abrasive paper comprises the following components in parts by mass:
aqueous polyurethane emulsion: 30-50 parts of
Curing agent: 0.1 to 0.5 portion
Releasing agent: 1-3 parts of
Water: 100 parts of (A);
according to the formula proportion, the waterborne polyurethane emulsion, the curing agent and the release agent are simultaneously added into a container, stirred for 10min at 200r/min and kept stand to obtain the latex for the waterproof abrasive paper, wherein the solid content of the latex is 25-30%, the particle size is 50-100nm, the viscosity is 30-80cp, and the molecular weight is 500-1500.
9. A preparation method of base paper of sand paper is characterized in that the base paper is soaked by the latex of any one of claims 1 to 8 for 1 to 2min, dried at low temperature to 40 to 60 ℃ of surface dryness, soaked for 2 to 3min, dried at 90 to 110 ℃ and hot-pressed for 0.5 to 2min at 120-140 ℃ and 2 to 6Mpa to obtain the water-resistant sand paper base paper.
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| CN101475678A (en) * | 2009-01-19 | 2009-07-08 | 中山市康和化工有限公司 | Aqueous polyurethane emulsion and preparation thereof |
| CN111411543A (en) * | 2020-05-09 | 2020-07-14 | 中国林业科学研究院木材工业研究所 | Adhesive for formaldehyde-free impregnated bond paper and preparation method thereof |
| CN111531658A (en) * | 2020-05-09 | 2020-08-14 | 中国林业科学研究院木材工业研究所 | Impregnated bond paper facing formaldehyde-free artificial board and preparation method thereof |
| CN111531660A (en) * | 2020-05-09 | 2020-08-14 | 中国林业科学研究院木材工业研究所 | Low-formaldehyde impregnated bond paper facing artificial board and preparation method thereof |
| CN113134879A (en) * | 2021-04-20 | 2021-07-20 | 中国林业科学研究院木材工业研究所 | Fragrance-releasing decorative artificial board and preparation method thereof |
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2022
- 2022-01-10 CN CN202210021607.2A patent/CN114351503B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475678A (en) * | 2009-01-19 | 2009-07-08 | 中山市康和化工有限公司 | Aqueous polyurethane emulsion and preparation thereof |
| CN111411543A (en) * | 2020-05-09 | 2020-07-14 | 中国林业科学研究院木材工业研究所 | Adhesive for formaldehyde-free impregnated bond paper and preparation method thereof |
| CN111531658A (en) * | 2020-05-09 | 2020-08-14 | 中国林业科学研究院木材工业研究所 | Impregnated bond paper facing formaldehyde-free artificial board and preparation method thereof |
| CN111531660A (en) * | 2020-05-09 | 2020-08-14 | 中国林业科学研究院木材工业研究所 | Low-formaldehyde impregnated bond paper facing artificial board and preparation method thereof |
| CN113134879A (en) * | 2021-04-20 | 2021-07-20 | 中国林业科学研究院木材工业研究所 | Fragrance-releasing decorative artificial board and preparation method thereof |
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