CN114351503B - Emulsion for waterproof abrasive paper and use method thereof - Google Patents
Emulsion for waterproof abrasive paper and use method thereof Download PDFInfo
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Abstract
The invention discloses a latex for waterproof abrasive paper with high tensile strength, folding endurance and lyophobic performance and a use method thereof. The latex component is 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 smaller particle size, smaller molecular weight and moderate viscosity, can be well soaked into paper, adopts the arrowhead bamboo nanocellulose and sucrose fatty acid ester to synergistically modify polyurethane latex, and compared with the published latex-treated base paper, the base paper of the abrasive paper subjected to twice soaking treatment is better in dry/wet tensile strength, tearing degree, folding endurance and liquid repellency, and meets the requirements of related national standard superior products. The base paper is impregnated twice and hot pressed to obtain the sand paper substrate with more excellent performance, which is more suitable for the subsequent sand paper processing.
Description
Technical Field
The invention relates to emulsion for waterproof abrasive paper and a use method thereof, belonging to the technical field of papermaking auxiliary agents.
Background
The waterproof abrasive paper is widely used for grinding and polishing the surfaces of various paint surfaces in the furniture industry; polishing before and after the paint spraying in the automobile repair and automobile production; and (5) polishing jewelry and metal products. With the rapid increase of the yield in the automobile manufacturing industry, the requirements on the high-quality waterproof abrasive paper are higher and higher, and the market prospect of the carrier substrate (abrasive paper base paper) of the high-quality waterproof abrasive paper is also seen by the paper industry. The base papers of water-resistant sandpaper are mainly divided into two categories: firstly, kraft paper is used for being soaked on the surface of resin to form a water-resistant layer, so that the waterproof effect is achieved; first, latex paper, which is used 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 manufacture of the base paper, the existing production process mostly adopts latex to dip or surface coat the base paper of the sand paper so as to endow the base paper with water and oil resistance and high folding resistance. For example, liu Qunhua (paper and papermaking, 6 th month of 2014 and 6 th day of 34 rolls) adopts styrene-acrylic latex to carry out surface treatment on the sand paper in a surface coating mode, so that the solvent resistance and flexibility of the sand paper are improved, wang Xiyun (China paper industry, 3 th month of 2019 and 6 th day of 40 rolls) and the like are coated with a polyvinyl alcohol (PVA)/nano-microfibril (NFC) composite coating to improve the oil resistance and mechanical property of the sand paper base paper. Guo Youshi (CN 102191725B) adopts compound glue solution of ethylene-vinyl acetate, chloroprene, zinc oxide and AKD to impregnate the base paper, adopts compound glue solution of polyvinyl alcohol, styrene-butadiene and polyurethane to coat the surface of the base paper after drying, and adopts compound glue solution of oxidized starch and nonionic stripper to coat the back of the base paper at the same time, thus obtaining the base paper of the sand paper with excellent water resistance, oil resistance, folding resistance, tensile strength and the like. On the premise of unchanged performance of the base paper, the final service performance of the base paper of the abrasive paper is determined by the performances of the impregnated glue solution and the coating glue solution of the base paper, in the prior study, the base paper is simply coated, the liquid repellent performance of the base paper is still available, but the improvement effect on the physical strength of the base paper is not great, in particular the folding resistance (the thickness of the coating is limited); the base paper can be improved in depth by carrying out dipping treatment on the base paper while coating the surface, but most of the existing dipping glue solutions are simple compounding of several functional substances, and the synergistic effect is not obvious.
Therefore, preparing a latex which combines the 'advanced treatment' and the surface properties of the base paper and providing a using method thereof is necessary for improving the hydrophobicity, the folding strength and the comprehensive properties of the base paper of the sand paper.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and provides a preparation method of the latex for the waterproof abrasive paper, so that the physical strength of the waterproof abrasive paper can reach the relevant national standard requirements. The components comprise, by mass fraction:
aqueous polyurethane emulsion: 30-50 parts
Curing agent: 0.1-0.5 part
And (3) a release agent: 1-3 parts
Water: 100 parts.
Specifically, the curing agent is one or two of isocyanate TDI and MDI. The release agent is one or two of organochlorosilane or organoalkoxysilane.
The formula of the aqueous polyurethane emulsion is as follows: the molar ratio of the dihydric alcohol to the diisocyanate is 0.8-1.5, the molar fraction of the dihydric alcohol is 30-50, the chain extender is 2-5, the hydrophilic agent is 3-8, the TEMPO oxidation method Cizhu nanocellulose 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 glycol includes one or more of polyester glycol and polyether glycol without aliphatic ring and aromatic ring. 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 Cizhu nano cellulose prepared by a TEMPO method, the solid content is 0.5-2%, and the particle size is 200-800nm. The arrowhead fiber has larger size and larger physical strength than the fiber of common wood and bamboo, participates in the 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 mono-ester, fatty acid di-ester and fatty acid tri-ester, and has the functions of emulsifying and reacting with nano cellulose to generate hydrophobic and oleophobic components.
The preparation method of the aqueous polyurethane emulsion latex comprises the following steps:
1) Preparing a mixed solution of the arrowhead nano-cellulose and the sucrose fatty acid ester: mixing the measured Cizhu nanocellulose and sucrose fatty acid ester, and stirring at about 1500r/min for half an hour.
2) The dihydric alcohol and the diisocyanate are added into a reaction kettle with a stirring and refluxing device according to a proportion, and the prepolymer is prepared under the protection of high-purity nitrogen, wherein the reaction temperature is 45-55 ℃ and the reaction time is 0.3-0.5 h.
3) Heating the prepolymer to 70-80 ℃, respectively dripping a chain extender and a mixed solution of the arrowhead nano cellulose and the sucrose fatty acid ester into the prepolymer, wherein the dripping time of the chain extender is 10-20min, the dripping time of the chain extender is 0.5-1.5h, the dripping time of the nano cellulose is 20-30min, and the stirring speed is 50-100r/min. Then cooling to 40-60 ℃, adding hydrophilic agent, and finishing the reaction within 30min, wherein the reaction time is 0.5-1.5h.
4) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously reducing viscosity with proper amount of acetone, adding water after proper viscosity, shearing at high speed of 3000-5000r/min, evaporating to remove acetone to obtain the aqueous polyurethane emulsion.
5) The latex for the waterproof abrasive paper comprises the following components in percentage by mass:
aqueous polyurethane emulsion: 30-50 parts
Curing agent: 0.1-0.5 part
And (3) a release agent: 1-3 parts
Water: 100 parts.
According to the formula proportion, the aqueous polyurethane emulsion, the curing agent and the release agent are added into a container at the same time, stirred for 10min at 200r/min, and stood still, thus obtaining the emulsion for the waterproof abrasive paper. The solid content of the emulsion is 25-30%, the grain diameter is 50-100nm, the viscosity is 30-80cp, and the molecular weight is 500-1500.
The latex is adopted to impregnate (1-2 min) -dry at low temperature until the surface is dry (40-60 ℃), impregnate (2-3 min) -dry (90-110 ℃), and hot press (120-140 ℃, and the pressure of 2-6Mpa is pressed for 0.5-2 min), thus obtaining the waterproof abrasive paper base paper; the latex type waterproof abrasive paper base paper is tested for relevant physical properties according to industry standards JB/T7499-2006 and QB/T1312-2018.
The invention has the following advantages:
1) In preparing the aqueous polyurethane emulsion, specific reaction conditions are selected: if the specific stirring speed and the shorter reaction time length enable the obtained polyurethane emulsion to have smaller grain diameter, smaller molecular weight and moderate viscosity, the prepared emulsion component can better permeate into the paper, and the dipping treatment of the waterproof abrasive paper is more sufficient and deeper.
2) The arrowhead nanocellulose is introduced in the chain extension reaction stage and can participate in the polyurethane generation reaction, and the arrowhead fibre has larger size and larger physical strength than the fibre of common wood and bamboo, so that the finally obtained latex adhesive film for base paper impregnation has excellent tensile and folding resistance and corresponding performance of the waterproof abrasive paper base paper.
3) The sucrose fatty acid ester is added into the Sagittaria sagittifolia nanocellulose, so that polyurethane can be better dispersed in solvent water in high-speed shearing dispersion, and in a certain concentration range, the sucrose fatty acid ester can enable the nanocellulose modified polyurethane material to show better hydrophobicity and oleophobicity, and the wet tensile strength of latex is improved to a certain extent. The synergic action brought by the synergic reaction of the waterproof abrasive paper and polyurethane is beneficial to greatly improving the folding endurance and the tensile strength of the waterproof abrasive paper base paper.
4) The water-resistant abrasive paper base paper is subjected to dipping-low-temperature drying to surface drying-dipping-drying) -hot pressing treatment by adopting the latex, the sizing amount of the water-resistant abrasive paper base paper is larger, and the latex is distributed in a solid state in the paper and on the surface, so that the properties of the base paper including tensile strength, folding resistance and hydrophobic and oleophobic properties are improved from inside to outside.
Detailed Description
Example 1
1) Preparing a mixed solution of the arrowhead nano-cellulose and the sucrose fatty acid ester: 2 parts by weight of Sagittaria sagittifolia nanocellulose and 1 part by weight of a fatty acid monoester are mixed and stirred at a speed of about 1500r/min for half an hour.
2) Polyethylene glycol (molecular weight 200) and isophorone diisocyanate are added into a reaction kettle with a stirring and reflux device according to a mole ratio of 0.8, and a prepolymerization reaction is carried out under the protection of high-purity nitrogen, wherein the reaction temperature is 45 ℃, and the reaction time is 0.3h, so that the polyurethane prepolymer is prepared.
3) Heating the prepolymer to 70 ℃, dropwise adding 1, 4-butanediol into the prepolymer for 10min, dropwise adding the mixture of the Sagittaria sagittifolia nano cellulose and the mono-fatty acid ester for 20min, and performing chain extension reaction for 1.5h at a stirring speed of 50r/min. Then cooling to 40 ℃, adding a hydrophilic agent, and finishing the adding within 30min, wherein the reaction time is 0.5h.
4) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously reducing viscosity with proper amount of acetone, adding water after proper viscosity, shearing at high speed of 3000r/min, evaporating to remove acetone, and obtaining the aqueous polyurethane emulsion.
5) The latex for the waterproof abrasive paper comprises the following components in percentage by mass:
aqueous polyurethane emulsion: 30 parts of
Curing agent: 0.1 part
And (3) a release agent: 1 part of
Water: 100 parts.
According to the formula proportion, the aqueous polyurethane emulsion, the curing agent and the release agent are added into a container at the same time, stirred for 10min at 200r/min, and stood still, thus obtaining the emulsion for the waterproof abrasive paper. The latex is adopted to impregnate (1 min) -dry at low temperature to surface dryness (40 ℃), impregnate (2 min) -dry (90 ℃) and hot press (120 ℃,6Mpa pressure is pressed for 0.5 min) the base paper, thus obtaining the waterproof abrasive paper base paper; the latex type waterproof abrasive paper base paper is tested for relevant physical properties according to industry standards JB/T7499-2006 and QB/T1312-2018.
Example 2
1) Preparing a mixed solution of the arrowhead nano-cellulose and the sucrose fatty acid ester: 8 parts by weight of Sagittaria sagittifolia nanocellulose and 5 parts by weight of a di-fatty acid ester are mixed and stirred 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 a molar ratio of 1.5, and carrying out a prepolymerization reaction under the protection of high-purity nitrogen at a reaction temperature of 55 ℃ for 0.5h to obtain the polyurethane prepolymer.
3) Heating the prepolymer to 80 ℃, dropwise adding ethylene glycol into the prepolymer for 10min, dropwise adding the mixed solution of the Sagittaria nano cellulose and the double fatty acid ester for 30min, and performing chain extension reaction for 0.5h at a stirring speed of 100r/min. Then cooling to 60 ℃, adding a hydrophilic agent, and finishing the adding within 30min, wherein the reaction time is 1.5h.
4) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously reducing viscosity with proper amount of acetone, adding water after proper viscosity, shearing at high speed of 5000r/min, evaporating to remove acetone, and obtaining the aqueous polyurethane emulsion.
5) The latex for the waterproof abrasive paper comprises the following components in percentage by mass:
aqueous polyurethane emulsion: 50 parts of
Curing agent: 0.5 part
And (3) a release agent: 3 parts of
Water: 100 parts.
According to the formula proportion, the aqueous polyurethane emulsion, the curing agent and the release agent are added into a container at the same time, stirred for 10min at 200r/min, and stood still, thus obtaining the emulsion for the waterproof abrasive paper. The latex is adopted to impregnate (2 min) -dry at low temperature to surface dryness (60 ℃), impregnate (3 min) -dry (110 ℃) and hot press (140 ℃,6Mpa pressure for 0.5 min) the base paper, thus obtaining the waterproof abrasive paper base paper; the latex type waterproof abrasive paper base paper is tested for relevant physical properties according to industry standards JB/T7499-2006 and QB/T1312-2018.
Example 3
1) Preparing a mixed solution of the arrowhead nano-cellulose and the sucrose fatty acid ester: 5 parts by weight of Sagittaria sagittifolia nanocellulose and 3 parts by weight of a tri-fatty acid ester are mixed and stirred at a speed of about 1500r/min for half an hour.
2) Polyester diol CMA-1024 and polyethylene glycol (molar ratio 1: 1) Adding the polyurethane prepolymer and hexamethylene diisocyanate into a reaction kettle with a stirring and refluxing device according to a molar ratio of 1.3, and carrying out a prepolymerization reaction under the protection of high-purity nitrogen at a 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 mixed solution of the Sagittaria nano cellulose and the tri-fatty acid ester for 25min, and carrying out chain extension reaction for 0.8h at a stirring speed of 80r/min. Then cooling to 50 ℃, adding a hydrophilic agent, and finishing the adding within 30min, wherein the reaction time is 1h.
4) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously reducing viscosity with proper amount of acetone, adding water after proper viscosity, shearing at high speed of 4000r/min, evaporating to remove acetone, and obtaining the aqueous polyurethane emulsion.
5) The latex for the waterproof abrasive paper comprises the following components in percentage by mass:
aqueous polyurethane emulsion: 40 parts of
Curing agent: 0.3 part
And (3) a release agent: 2 parts of
Water: 100 parts.
According to the formula proportion, the aqueous polyurethane emulsion, the curing agent and the release agent are added into a container at the same time, stirred for 10min at 200r/min, and stood still, thus obtaining the emulsion for the waterproof abrasive paper. The latex is adopted to impregnate (90 s) -dry at low temperature to surface dryness (50 ℃), impregnate (2.5 min) -dry (100 ℃) and hot press (130 ℃,4Mpa pressure is pressed for 1 min) the base paper, thus obtaining the waterproof abrasive paper base paper; the method comprises the steps of carrying out a first treatment on the surface of the The latex type waterproof abrasive paper base paper is tested for relevant physical properties according to industry standards JB/T7499-2006 and QB/T1312-2018.
Comparative example 1
The technical scheme is different from the technical scheme of the example 1 in that the arrowhead nanocellulose and the sucrose fatty acid ester are not added.
Comparative example 2
The technical scheme is different from that of example 1 in that 2 parts by weight and 1 part by weight of sucrose fatty acid ester of common nanocellulose are added.
Comparative example 3
The difference from the technical scheme of example 1 is that 3 parts by weight of the Sagittaria sagittifolia nanocellulose is added, and no sucrose fatty acid ester is added.
Comparative example 4
The technical scheme is different from that of the embodiment 1 in that 3 parts by weight of sucrose fatty acid ester is added and the arrowhead 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 waterproof abrasive paper base paper latex, the prepared impregnated latex has smaller particle size and smaller molecular weight under similar solid content conditions, which is beneficial to the penetration of latex particles in the paper.
Table 2 comparison of physical Properties of base paper of waterproof abrasive paper
C n102191725b test reference standard: JB/T7499-2006, QB/T1312-2018
According to the invention, the polyurethane emulsion is synergistically modified by the arrowhead nanocellulose and the sucrose fatty acid ester, and compared with the published emulsion-treated base paper, the base paper of the sand paper subjected to twice dipping treatment by the emulsion has better dry/wet tensile strength, tearing strength, folding endurance and liquid repellency, and meets the requirements of related national standard high-class products. The base paper is impregnated twice and hot pressed to obtain the sand paper substrate with more excellent performance, which is more suitable for the subsequent sand paper processing.
Claims (7)
1. The latex for the waterproof abrasive paper is characterized by comprising the following components in parts by weight:
aqueous polyurethane emulsion: 30-50 parts
Curing agent: 0.1-0.5 part
And (3) a release agent: 1-3 parts
Water: 100 parts;
the aqueous polyurethane emulsion consists of the following raw materials: the molar ratio of the dihydric alcohol to the diisocyanate is 0.8-1.5, the molar fraction of the dihydric alcohol is 30-50, the molar fraction of the chain extender is 2-5, the molar fraction of the hydrophilizing agent is 3-8, the molar fraction of the TEMPO oxidation method Ci bamboo nanocellulose 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;
the preparation method of the latex for the waterproof abrasive paper comprises the following steps:
1) Preparing a TEMPO oxidation method Cizhu nanocellulose/sucrose fatty acid ester mixed solution: mixing the metered TEMPO oxidation process Cizhu nanocellulose and sucrose fatty acid ester, and stirring at 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 proportion, and carrying out a prepolymerization reaction under the protection of high-purity nitrogen at a reaction temperature of 45-55 ℃ for 0.3-0.5h to obtain a polyurethane prepolymer;
3) Heating the prepolymer to 70-80 ℃, respectively dripping a chain extender and a mixed solution of the arrowhead nano cellulose and the sucrose fatty acid ester into the prepolymer, wherein the dripping time of the chain extender is 10-20min, the dripping time of the chain extender is 0.5-1.5h, the dripping time of the nano cellulose is 20-30min, the stirring speed is 50-100r/min, then cooling to 40-60 ℃, adding a hydrophilic agent, and finishing the dripping within 30min, wherein the reaction time is 0.5-1.5h;
4) Cooling to room temperature, adding glacial acetic acid for neutralization, simultaneously reducing viscosity with proper amount of acetone, adding water after proper viscosity, shearing at high speed of 3000-5000r/min, evaporating to remove acetone to obtain aqueous polyurethane emulsion;
5) According to the formula proportion, the aqueous polyurethane emulsion, the curing agent and the release agent are added into a container at the same time, stirred for 10min at 200r/min, and kept stand to obtain the emulsion for the waterproof abrasive paper, wherein the solid content of the emulsion is 25-30%, the particle size is 50-100nm, the viscosity is 30-80cP, and the molecular weight is 500-1500.
2. The latex for water-resistant coated abrasive according to claim 1, wherein the diisocyanate is one or more of isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene Diisocyanate (HDI), and Lysine Diisocyanate (LDI).
3. A latex for water-resistant coated abrasive according to claim 1, wherein said chain extender is one of ethylene glycol, propylene glycol, 1, 4-butanediol, diethylene glycol, 1, 4-cyclohexanediol.
4. A water-resistant latex for sandpaper as defined in claim 1, wherein said hydrophilic agent is one of dimethylolpropionic acid (DMPA) or dimethylolbutyric acid (DMBA).
5. The latex for water-resistant sandpaper as defined in claim 1, wherein said TEMPO-process arrowhead nanocellulose has a solid content of 0.5% -2% and a particle size of 200-800nm.
6. The latex for water-resistant coated abrasive according to claim 1, wherein the sucrose fatty acid ester is one or more of a mono-fatty acid ester, a di-fatty acid ester and a tri-fatty acid.
7. A method for preparing water-resistant abrasive paper base paper, which is characterized in that the latex of any one of claims 1-6 is used for dipping the base paper for 1-2min, drying is carried out at 40-60 ℃ until the surface is dry, dipping is carried out for 2-3min, drying is carried out at 90-110 ℃, and then hot pressing is carried out for 0.5-2min at 120-140 ℃ and 2-6MPa, thus obtaining the water-resistant abrasive 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 |
| CN111531660B (en) * | 2020-05-09 | 2022-02-08 | 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 |
| CN111531658B (en) * | 2020-05-09 | 2021-11-16 | 中国林业科学研究院木材工业研究所 | Preparation method of impregnated bond paper facing formaldehyde-free artificial board |
| CN111411543B (en) * | 2020-05-09 | 2022-01-28 | 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 |
| CN113134879B (en) * | 2021-04-20 | 2023-01-31 | 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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