CN116716759A - Waterproof and oil-proof paper pulp molding and coating method - Google Patents
Waterproof and oil-proof paper pulp molding and coating method Download PDFInfo
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- CN116716759A CN116716759A CN202310923203.7A CN202310923203A CN116716759A CN 116716759 A CN116716759 A CN 116716759A CN 202310923203 A CN202310923203 A CN 202310923203A CN 116716759 A CN116716759 A CN 116716759A
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- 238000000465 moulding Methods 0.000 title claims abstract description 70
- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 43
- 238000000576 coating method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000003921 oil Substances 0.000 claims abstract description 37
- 239000000080 wetting agent Substances 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 229920005989 resin Polymers 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 18
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 13
- 239000002562 thickening agent Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 239000000123 paper Substances 0.000 claims description 24
- 239000005871 repellent Substances 0.000 claims description 7
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 229920000180 alkyd Polymers 0.000 claims description 5
- 229920000178 Acrylic resin Polymers 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 4
- 239000010902 straw Substances 0.000 claims description 4
- 229920001225 polyester resin Polymers 0.000 claims description 3
- 239000004645 polyester resin Substances 0.000 claims description 3
- 229920005749 polyurethane resin Polymers 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 2
- 239000005062 Polybutadiene Substances 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 229920002678 cellulose Polymers 0.000 claims description 2
- 239000001913 cellulose Substances 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000011105 molded pulp Substances 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 claims description 2
- 229920000058 polyacrylate Polymers 0.000 claims description 2
- 229920002857 polybutadiene Polymers 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 claims description 2
- 230000002940 repellent Effects 0.000 claims 5
- 229920001296 polysiloxane Polymers 0.000 claims 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims 2
- QHIWVLPBUQWDMQ-UHFFFAOYSA-N butyl prop-2-enoate;methyl 2-methylprop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.COC(=O)C(C)=C.CCCCOC(=O)C=C QHIWVLPBUQWDMQ-UHFFFAOYSA-N 0.000 claims 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 9
- 239000003973 paint Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 8
- 239000007921 spray Substances 0.000 description 8
- 239000008367 deionised water Substances 0.000 description 7
- 229910021641 deionized water Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
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- 239000002939 oilproofing Substances 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 230000002209 hydrophobic effect Effects 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 239000008157 edible vegetable oil Substances 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
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- 239000011521 glass Substances 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
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- 238000004806 packaging method and process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention discloses a waterproof and oil-proof paper pulp molding and coating method, in particular to a formula of a wetting agent capable of coating a film on paper pulp molding: 0 to 20 parts of water, 10 to 80 parts of water-based resin, 0.1 to 1 part of wetting agent, 0.1 to 1 part of leveling agent, 0.1 to 1 part of defoaming agent, 0.1 to 1 part of thickening agent and 0.1 to 10 parts of film forming auxiliary agent. The special wetting agent provided by the formula of the invention is widely applicable to various water-based resins, has universality in resin selection, adopts a traditional spraying mode in a coating scheme, and has the characteristic of simple operation process. The paint prepared by the formula can be sprayed on pulp molding to enable the pulp molding to have water and oil resistance, can be used on pulp molding such as disposable cutlery boxes and flower vases, and has long-term water and oil resistance and wide application prospect.
Description
Technical Field
The invention relates to the field of pulp molding and coating, in particular to a waterproof and oil-proof pulp molding and a preparation method thereof.
Background
The traditional pulp molding products are more lining buffer materials for manufacturing paper tableware, fruit egg trays and product packages to replace plastics, so that the manufactured pulp molding products have rough surface performance, poorer appearance compared with other types of packages and extremely poor water and oil resistance. This is related to the fibrous nature of the pulp, and the rough, readily water-absorbing, flammable properties of the fibrous surface, etc. have given the limitations of the products produced in these respects.
For the product external package with higher appearance requirement, the most common mode at present adopts traditional materials such as plastics, iron boxes and the like to package, so that the environment-friendly cost is not high and the cost is high. In addition, with the coming-out of plastic-limited materials in recent years, many packaging materials are strictly prohibited from using plastic materials, such as disposable paper straws, disposable tableware and the like. The most basic performance requirement of the products is water and oil proofing, namely, the water and oil proofing pulp molding can be prevented from being corroded by water and oil in the use process, so that the water and oil proofing pulp molding has wide application prospect in replacing the products.
In the papermaking field, an internal sizing mode is generally adopted to enable paper to have water and oil resistance so as to expand the use scene of the paper. However, the sizing mode can only cope with the use scene of general waterproof and oil-proof requirements, and is almost impossible to use when the paper straw, disposable tableware, paper vase and the like need to be directly contacted with water and oil, so that the coating of a waterproof and oil-proof protective film on the surface of pulp molding is necessary, which is also a more rising treatment mode at present.
In the prior art, patent publication No. CN113215862A discloses a preparation method of a full-degradable fluorine-free paper pulp molding dinner plate, pulp raw materials are crushed to obtain pulp, the processed pulp is subjected to a fluffer to obtain uniform pulp, and then assistants such as a waterproof agent, a wet strength agent, a dry strength agent and the like are added to prepare mixed pulp. The traditional auxiliary agent is added to carry out internal sizing when the paper pulp is prepared, and the paper pulp is molded into a certain waterproof and oil-proof performance after the subsequent integral molding. Patent publication No. CN114990938A discloses a preparation method of a self-cleaning super-hydrophobic pulp molding material, wherein a hydrophobic auxiliary AKD and some traditional inorganic fillers are added during the preparation of pulp, so that the self-hydrophobic effect is achieved, and the problem that food residues adhere to disposable pulp molding cutlery boxes is solved. The novel vinyl fluorine-containing copolymer is prepared by copolymerizing short-chain fluorine-containing monomers with quaternary amine acrylic ester monomers and acrylic acid monomers in a free radical manner, and the novel vinyl fluorine-containing copolymer is prepared into a water-proof and oil-proof composition which is applied to paper-based products and is combined with hydroxyl groups with negative charges in paper fibers, so that a good retention effect can be achieved.
Disclosure of Invention
Aiming at the problem that the pulp molding in the prior art adopts the traditional water-proof and oil-proof auxiliary agent to carry out internal sizing when preparing the pulp, the effect achieved by the process is general, and the pulp molding effect which needs to be in direct contact or long-term contact with water and oil is poor, and the national statute adopting the fluorine-containing auxiliary agent is forbidden to be used on food contact materials. The invention aims at the defects and provides a waterproof and oil-proof paper pulp molding and a preparation method thereof.
The invention aims to spray a coating on the molding surface after pulp molding to endow the paper with water-proof and oil-proof properties so as to solve the limitation of traditional internal sizing on the selection of water-proof and oil-proof sizing agents.
The invention further aims at providing a waterproof and oil-proof spray coating which belongs to an aqueous system, and the used film forming materials and auxiliary agents do not contain fluorine, do not have VOC emission, and are safe and environment-friendly.
The above object of the present invention is achieved by the following technical scheme
The paper pulp molding does not have water and oil proofing or water and oil proofing performance after paper pulp molding and a coating method.
Further, the water and oil resistant pulp molding and coating method includes, but is not limited to, disposable paper straw, disposable tableware, water cup, food packaging box, paper vase, etc. packaging pulp molding requiring long-term contact with water and oil.
Further, the water-proof and oil-proof paper pulp molding and coating method is characterized in that the coating method is characterized in that 0-20 parts of water, 10-80 parts of aqueous resin, 0.1-1 part of wetting agent, 0.1-1 part of leveling agent, 0.1-1 part of defoaming agent, 0.1-1 part of thickening agent and 0.1-10 parts of film forming auxiliary agent are prepared in proportion and then sprayed on the surface needing water-proof and oil-proof treatment.
Further, the water-and oil-proof pulp molding and coating method is characterized in that the water-based resin comprises single-component and double-component alkyd resin, acrylic resin, styrene-acrylic resin, polyester resin, polyurethane resin, epoxy resin, phenolic resin, modified polybutadiene resin, cellulose derivative and the like.
Further, the waterproof and oilproof paper pulp molding and coating method is characterized in that the wetting agent comprises one or more of polyether wetting agent, acrylate wetting agent, organosilicon wetting agent, polyether modified polyacrylate wetting agent, polyether modified organosilicon wetting agent and alkynol modified organosilicon wetting agent.
Further, the water-proof and oil-proof pulp molding and coating method is characterized in that the coating method comprises the following steps:
further, S1: removing impurities from the molded pulp molding, and removing surface foreign matters and burrs;
further, S2: preparing a coating resin from a water-based resin wetting agent, a leveling agent, a defoaming agent, a thickening agent and a film forming auxiliary agent according to a proportion, and uniformly mixing for later use;
further, S3, uniformly spraying the prepared aqueous resin onto paper pulp molding needing waterproof and oil-proof surface treatment, so that the paper pulp molding is uniformly spread and permeated;
further, S4: and (3) placing the coated pulp mould at room temperature or baking and solidifying at a low temperature of 50-100 ℃, so that a waterproof and oil-proof protective film is formed on the pulp mould, and the waterproof and oil-proof pulp mould is obtained.
The beneficial effects of the invention are that
The varnish is prepared by matching the independently developed auxiliary agents such as wetting agents, leveling agents and the like with the water-based resin, and can be well wetted and spread on the molded paper pulp molding, so that the paper pulp molding surface can be uniformly coated. Both the paper pulp molding with the hydrophobic treatment and the paper pulp molding with the primary hydrophobic treatment can be fully wetted and spread, and the selection of film forming materials and coating modes is greatly widened. The compactness of the film forming material can effectively prevent the infiltration of water and oil to pulp molding after the waterproof and oil-proof film is formed and solidified, and on the other hand, the auxiliary agent used contains a hydrophobic and oleophobic component and can play an auxiliary role, so that the waterproof and oil-proof effects are more stable.
Detailed Description
The following examples are given to illustrate the practice of the present invention in detail and to provide additional technical parameters and aids not specifically described in the following examples, which may be routinely and adaptively selected by those skilled in the art based on the knowledge of the skilled artisan.
The physical properties of the present invention were measured by the following methods
The test method refers to the GB/T36787-2018 pulp molded tableware related test standard for testing
Leakage of water
Placing the coated pulp molding sample on a flat plate or a glass plate lined with filter paper, filling water at the temperature of 23+/-1 ℃, standing for 30min, observing whether the filter paper has exuded watermarks, if so, judging that the filter paper has seepage, otherwise, judging that the filter paper has no seepage. 3 specimens were measured for each specimen, and if none of the 3 specimens leaked, the specimen was judged to have leaked.
Heat resistant water
The coated pulp molding sample was placed on a dry glass plate or flat plate lined with filter paper, filled with water at 95.+ -. 5 ℃ and allowed to stand for 30 minutes, and then the presence or absence of deformation of the sample and the presence or absence of negative permeability and leakage at the bottom were observed. And 3 samples are measured for each sample, and if the phenomena of negative seepage, leakage and deformation do not occur in all the 3 samples, the samples are judged to be free of negative seepage, leakage and deformation.
Heat resistant oil
The coated pulp molded sample was placed on a dry glass plate or flat plate lined with filter paper, filled with edible oil at 95.+ -. 5 ℃ and left to stand for 30min, and after that, the sample was observed for the presence of deformation and the presence of exudation oil marks on the filter paper. And 3 samples are measured for each sample, and if the 3 samples are not deformed and oil marks do not appear on the filter paper, the samples are judged to be free of negative seepage, leakage and deformation.
Long-term water and oil resistance
And (3) weighing water and edible oil according to the mass ratio of 10:1, filling the water and edible oil into a pulp molding sample, placing the pulp molding sample into a closed container, controlling the water volatilization speed, observing the leakage condition of the sample at room temperature at regular time until the leakage is observed outside the sample, and recording the leakage time, namely the water and oil resistance.
Example 1
15 parts of deionized water, 80 parts of water-based alkyd resin,2470 wetting agent 0.2 parts, leveling agent 0.2 parts, defoaming agent 0.2 parts, thickening agent 0.1 parts and film forming auxiliary agent 4.3 parts are sequentially added into a stirrer, the stirring is started to disperse for 30min, and the pulp is transferred to a spray gun to be uniformly sprayed on the pretreated pulp molding surface after uniform dispersion. And (3) naturally drying the surface of the paper pulp in a placing room, and then transferring the paper pulp to a baking oven at 50 ℃ for baking to obtain the waterproof and oilproof paper pulp molding.
Example 2
15 parts of deionized water, 80 parts of water-based alkyd resin,2411 wetting agent 0.2 parts, leveling agent 0.2 parts, defoamer 0.2 parts, thickener 0.1 parts, film forming auxiliary agent 4.3 parts are added into a stirrer in sequence, the stirring is started to disperse for 30min, and the mixture is transferred to a spray gun to be uniformly sprayed on the pretreated pulp molding surface after being uniformly dispersed. And (3) naturally drying the surface of the paper pulp in a placing room, and then transferring the paper pulp to a baking oven at 50 ℃ for baking to obtain the waterproof and oilproof paper pulp molding.
Example 3
12 parts of deionized water, 80 parts of aqueous acrylic resin,2408 wetting agent 0.2 parts, flatting agent 0.2 parts, defoamer 0.2 parts, thickener 0.2 parts and film forming auxiliary agent 7.3 parts are added into a stirrer in sequence, are started to disperse for 30min, and are transferred to a spray gun to be uniformly sprayed on pretreated paper after being uniformly dispersedPulp molding surface. And (3) naturally drying the surface of the paper pulp in a placing room, and then transferring the paper pulp to a baking oven at 50 ℃ for baking to obtain the waterproof and oilproof paper pulp molding.
Example 4
12 parts of deionized water, 80 parts of aqueous acrylic resin,2405 wetting agent 0.2 parts, leveling agent 0.2 parts, defoamer 0.2 parts, thickener 0.2 parts, film forming auxiliary agent 7.3 parts are added into a stirrer in sequence, the stirring is started to disperse for 30min, and the mixture is transferred to a spray gun to be uniformly sprayed on the pretreated pulp molding surface after being uniformly dispersed. And (3) naturally drying the surface of the paper pulp in a placing room, and then transferring the paper pulp to a baking oven at 50 ℃ for baking to obtain the waterproof and oilproof paper pulp molding.
Example 5
12 parts of deionized water, 80 parts of aqueous polyurethane resin,2412 wetting agent 0.2 parts, leveling agent 0.2 parts, defoamer 0.2 parts, thickener 0.2 parts, film forming auxiliary agent 7.3 parts are added into a stirrer in sequence, the stirring is started to disperse for 30min, and the mixture is transferred to a spray gun to be uniformly sprayed on the pretreated pulp molding surface after being uniformly dispersed. And (3) naturally drying the surface of the paper pulp in a placing room, and then transferring the paper pulp to a baking oven at 50 ℃ for baking to obtain the waterproof and oilproof paper pulp molding.
Example 6
12 parts of deionized water, 80 parts of water-based polyester resin,2108 wetting agent 0.2 parts, flatting agent 0.2 parts, defoamer 0.2 parts, thickener 0.2 parts and film forming auxiliary agent 7.3 parts are added into a stirrer in sequence, the stirring is started to disperse for 30min, and the mixture is transferred to a spray gun to be uniformly sprayed on the pretreated pulp molding surface after being uniformly dispersed. And (3) naturally drying the surface of the paper pulp in a placing room, and then transferring the paper pulp to a baking oven at 50 ℃ for baking to obtain the waterproof and oilproof paper pulp molding.
Comparative example 1
Blank, pulp molding without water-and oil-repellent treatment without aqueous resin coating.
Comparative example 2
Pulp moulding treated with conventional water-repellent auxiliaries is commercially available.
Comparative example 3
The formula of the paint without the wetting agent is as follows: 15 parts of deionized water, 80 parts of water-based alkyd resin, 0.2 part of flatting agent, 0.2 part of defoamer, 0.1 part of thickener and 4.3 parts of film forming additive are sequentially added into a stirrer, the stirring is started to be dispersed for 30 minutes, and the mixture is transferred to a spray gun to be sprayed on the pretreated pulp molding surface uniformly after being dispersed uniformly.
Evaluation of pulp molded article Performance test
The pulp molded articles in examples and comparative examples were measured for water leakage, hot water resistance, hot oil resistance, long-term water resistance and oil resistance, and the test results are shown in the following table:
from the test results of the above tables, it is clear that the comparative pulp is poor in water and oil repellency. The water can be prevented from leaking in a short period after the water-proof treatment, so that the water seepage is serious after the water-proof treatment, and the heat-resistant water and hot oil can not be prevented in a short period; the long-term water and oil resistance test shows that the phenomenon of water seepage and oil seepage occurs within one hour without waterproof treatment, the spraying scheme without wetting agent treatment can reach 5 hours after the traditional waterproof agent treatment, and the phenomenon of water seepage and oil seepage occurs within 2 hours. The anti-observation examples 1 to 6 are excellent in water and oil resistance test, and the long-term water and oil resistance test is more than 800 hours, and the short-term contact with water and oil and the long-term contact with water and oil are unaffected, so that a good water and oil resistance effect is achieved. The method can be applied to food pulp molding with direct contact of hot water and hot oil in a short period, and can also be applied to vases and related packaging materials with long-term contact of the hot water and the hot oil.
The above examples are preferred embodiments of the present invention, but the present invention is not limited to these examples, and changes, modifications, substitutions, combinations, and simplifications made by the above examples are all considered to be equivalent substitution methods without departing from the principle and spirit of the present invention, and are all included in the scope of the present invention.
Claims (6)
1. A method for molding and coating water and oil resistant paper pulp is characterized in that the paper pulp molding is not provided with water and oil resistant or water and oil resistant performance after paper pulp molding.
2. The method of molding and coating a water and oil repellent pulp according to claim 1, wherein the pulp molding includes, but is not limited to, disposable cutlery boxes, paper cups, paper straws, paper jars, wrapping paper, and the like, which are shaped articles requiring a water and oil repellent treatment.
3. The method for molding and coating the waterproof and oilproof paper pulp according to claim 1, wherein the coating method is characterized in that 0 to 20 parts of water, 10 to 80 parts of aqueous resin, 0.1 to 1 part of wetting agent, 0.1 to 1 part of leveling agent, 0.1 to 1 part of defoaming agent, 0.1 to 1 part of thickening agent and 0.1 to 10 parts of film forming additive are prepared in proportion and then sprayed on the surface needing waterproof and oilproof treatment.
4. A water and oil repellent pulp molding and coating method as defined in claim 3, wherein said aqueous resin comprises one and two component alkyd resins, acrylic resins, styrene resins, polyester resins, polyurethane resins, epoxy resins, phenolic resins, modified polybutadiene resins, cellulose derivatives, and the like.
5. The method for molding and coating water and oil repellent paper pulp according to claim 3, wherein the wetting agent comprises one or more of polyether wetting agent, acrylate wetting agent, silicone wetting agent, polyether modified polyacrylate wetting agent, polyether modified silicone wetting agent, and alkynol modified silicone wetting agent.
6. A water and oil repellent pulp moulding and coating process according to claim 3, characterized in that said coating process comprises the steps of:
s1: removing impurities from the molded pulp molding, and removing surface foreign matters and burrs;
s2: preparing a coating resin from a water-based resin wetting agent, a leveling agent, a defoaming agent, a thickening agent and a film forming auxiliary agent according to a proportion, and uniformly mixing for later use;
s3, uniformly spraying the prepared aqueous resin onto paper pulp molding which needs to be subjected to water-proof and oil-proof surface treatment, so that the paper pulp molding is uniformly spread and permeated;
s4: and (3) placing the coated pulp mould at room temperature or baking and solidifying at a low temperature of 50-100 ℃, so that a waterproof and oil-proof protective film is formed on the pulp mould, and the waterproof and oil-proof pulp mould is obtained.
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| CN116334951A (en) * | 2023-04-04 | 2023-06-27 | 广东冠力新材料有限公司 | Waterproof oil-proof paper-plastic dinner plate coating and preparation method thereof |
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| TW200728558A (en) * | 2006-01-27 | 2007-08-01 | Chi-Yee Yeh | Pulp moulding process and product |
| CN112852274A (en) * | 2021-01-05 | 2021-05-28 | 广东轻工职业技术学院 | Water-based gloss oil and preparation method thereof |
| CN113373738A (en) * | 2021-06-25 | 2021-09-10 | 浙江博特生物科技有限公司 | Water-resistant oil-resistant paper pulp molded tableware and preparation process thereof |
| CN113584943A (en) * | 2021-07-31 | 2021-11-02 | 广东博海化工科技有限公司 | Oil-proof water-based heat-sealing coating applied to paper food packaging material and preparation method and use method thereof |
| CN116334951A (en) * | 2023-04-04 | 2023-06-27 | 广东冠力新材料有限公司 | Waterproof oil-proof paper-plastic dinner plate coating and preparation method thereof |
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