CN117926633A - Dampproof impregnated paper and production process thereof - Google Patents
Dampproof impregnated paper and production process thereof Download PDFInfo
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- CN117926633A CN117926633A CN202410135770.0A CN202410135770A CN117926633A CN 117926633 A CN117926633 A CN 117926633A CN 202410135770 A CN202410135770 A CN 202410135770A CN 117926633 A CN117926633 A CN 117926633A
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- Prior art keywords
- parts
- component
- impregnated paper
- paper according
- moistureproof
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Links
- 238000004519 manufacturing process Methods 0.000 title abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 46
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000853 adhesive Substances 0.000 claims abstract description 35
- 230000001070 adhesive effect Effects 0.000 claims abstract description 35
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 23
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 18
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 18
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003822 epoxy resin Substances 0.000 claims abstract description 18
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000004593 Epoxy Substances 0.000 claims abstract description 15
- 239000002105 nanoparticle Substances 0.000 claims abstract description 15
- 239000004814 polyurethane Substances 0.000 claims abstract description 14
- 229920002635 polyurethane Polymers 0.000 claims abstract description 14
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 14
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 239000004952 Polyamide Substances 0.000 claims abstract description 10
- 229920002647 polyamide Polymers 0.000 claims abstract description 10
- 239000007822 coupling agent Substances 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 5
- 239000003960 organic solvent Substances 0.000 claims abstract description 5
- 239000013530 defoamer Substances 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000000498 ball milling Methods 0.000 claims description 5
- IUNMPGNGSSIWFP-UHFFFAOYSA-N dimethylaminopropylamine Chemical compound CN(C)CCCN IUNMPGNGSSIWFP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 5
- 239000012745 toughening agent Substances 0.000 claims description 5
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 4
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 4
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 4
- 239000000194 fatty acid Substances 0.000 claims description 4
- 229930195729 fatty acid Natural products 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 239000000600 sorbitol Substances 0.000 claims description 4
- -1 sorbitol fatty acid ester Chemical class 0.000 claims description 4
- LHIJANUOQQMGNT-UHFFFAOYSA-N aminoethylethanolamine Chemical compound NCCNCCO LHIJANUOQQMGNT-UHFFFAOYSA-N 0.000 claims description 3
- BSOPSBIGIYEHGT-UHFFFAOYSA-N dodecyl 2-phenylacetate Chemical compound CCCCCCCCCCCCOC(=O)CC1=CC=CC=C1 BSOPSBIGIYEHGT-UHFFFAOYSA-N 0.000 claims description 3
- 150000004996 alkyl benzenes Chemical class 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 claims description 2
- 229940083037 simethicone Drugs 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 239000002313 adhesive film Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
Landscapes
- Paper (AREA)
Abstract
The invention relates to the technical field of impregnated paper, and provides dampproof impregnated paper and a production process thereof, wherein the dampproof impregnated paper comprises a base paper substrate and impregnating adhesive; the impregnating adhesive comprises a component A and a component B; the component A comprises the following raw materials in parts by weight: 20-45 parts of polyurethane modified epoxy resin, 20-45 parts of epoxy modified acrylic resin, 8-16 parts of curing agent, 0.05-0.1 part of defoamer and 2-3 parts of flexibilizer; the component B comprises the following raw materials in parts by weight: 4-8 parts of polyamide wax, 2-3 parts of nano particles, 0.5-0.8 part of emulsifying agent, 0.2-0.5 part of coupling agent and 30-40 parts of organic solvent; the nano particles are silicon dioxide and/or titanium dioxide. Through the technical scheme, the problem of poor moisture resistance of impregnated paper in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of impregnated paper, in particular to moistureproof impregnated paper and a production process thereof.
Background
With the rapid development of economy, the impregnated paper is widely applied to various building decorations, furniture manufacture and equipment shells, and particularly used as decorative paper in the production and processing of decorative panels, and is a piece of adhesive film paper with certain resin content and volatile matter content, which is obtained by impregnating resin with plain paper or printing paper and drying, and is glued with a base material plate through a hot pressing process, so as to prepare the decorative panel with excellent surface performance and attractive patterns.
However, the existing impregnated paper has the problems of poor moisture resistance, easy moisture absorption and a series of cracking and bubbling of the impregnated paper, and the service life of the impregnated paper is influenced.
Disclosure of Invention
The invention provides moistureproof impregnated paper and a production process thereof, which solve the problem of poor moistureproof performance of the impregnated paper in the related technology.
The technical scheme of the invention is as follows:
The invention provides moistureproof impregnated paper, which comprises a base paper substrate and impregnating adhesive; the impregnating adhesive comprises a component A and a component B;
the component A comprises the following raw materials in parts by weight: 20-45 parts of polyurethane modified epoxy resin, 20-45 parts of epoxy modified acrylic resin, 8-16 parts of curing agent, 0.05-0.1 part of defoamer and 2-3 parts of flexibilizer;
the component B comprises the following raw materials in parts by weight: 4-8 parts of polyamide wax, 2-3 parts of nano particles, 0.5-0.8 part of emulsifying agent, 0.2-0.5 part of coupling agent and 30-40 parts of organic solvent;
the nano particles are silicon dioxide and/or titanium dioxide.
As a further technical scheme, the mass ratio of the component B to the component A is 1:3-8.
As a further technical scheme, the mass ratio of the polyurethane modified epoxy resin to the epoxy modified acrylic resin is 3:2-7.
In the invention, the moisture resistance of the impregnating adhesive is further improved by optimizing the mass ratio of the polyurethane modified epoxy resin to the epoxy modified acrylic resin in the impregnating adhesive.
As a further technical scheme, when the nano particles are silicon dioxide and titanium dioxide, the mass ratio of the silicon dioxide to the titanium dioxide is 4:1-6.
According to the invention, when the nano particles are silicon dioxide and titanium dioxide, and the mass ratio of the silicon dioxide to the titanium dioxide is 4:1-6, the moisture resistance of the impregnating adhesive is further improved.
As a further technical scheme, the preparation method of the component B comprises the following steps: and (3) ball-milling and mixing the coupling agent and the nano particles, and then adding the mixture into the mixture of the rest components to obtain the component B.
As a further technical scheme, the preparation method of the impregnating adhesive comprises the following steps: and mixing the raw materials of the component B and the component A to obtain the impregnating adhesive.
As a further technical scheme, the curing agent is one of dimethylaminopropylamine and N-hydroxyethyl ethylenediamine; the defoaming agent is one of simethicone and lauryl phenylacetate; the toughening agent is one of CMP-410 and MX-257.
As a further technical scheme, the organic solvent is one or more of N-propanol, N-methylpyrrolidone and alkylbenzene; the coupling agent is a silane coupling agent.
The invention also provides a production process of the moistureproof impregnated paper, which comprises the following steps: and coating the impregnating adhesive on the upper surface of the base paper substrate, and curing to obtain the moistureproof impregnated paper.
As a further technical scheme, the coating weight of the impregnating adhesive is 10-15 g/m 2.
The working principle and the beneficial effects of the invention are as follows:
1. According to the invention, polyurethane modified epoxy resin and epoxy modified acrylic resin are compounded in the impregnating adhesive of the moistureproof impregnated paper to form a denser network space, and meanwhile, the component B of the impregnating adhesive is dispersed into polyamide wax by adopting silicon dioxide and/or titanium dioxide nano particles, so that the nano particles fill gaps in the impregnating adhesive and are distributed more uniformly, the bonding strength of the impregnating adhesive is increased, and the moistureproof performance of the moistureproof impregnated paper is obviously improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following examples and comparative examples, the epoxy equivalent of the polyurethane modified epoxy resin is 235-270 g/eq; the model number of the epoxy modified acrylic resin is kpl-12365, and the viscosity is 5000-7000mpa.s; the model of dimethylaminopropylamine is HS-463; titanium dioxide average particle diameter 25nm; the granularity of the silicon dioxide is 5000 meshes; the polyamide wax is of the type PA-8700.
Example 1
The moistureproof impregnated paper comprises a base paper substrate and impregnating glue; the impregnating adhesive comprises a component A and a component B; the mass ratio of the component B to the component A is 1:3;
the component A comprises the following raw materials in parts by weight: 20 parts of polyurethane modified epoxy resin, 20 parts of epoxy modified acrylic resin, 8 parts of dimethylaminopropylamine, 0.05 part of lauryl phenylacetate and 2 parts of toughening agent MX-257;
The component B comprises the following raw materials in parts by weight: 4 parts of polyamide wax, 2 parts of titanium dioxide, 0.5 part of sorbitol fatty acid ester, 0.2 part of silane coupling agent KH550 and 30 parts of n-propanol;
the preparation method of the component B comprises the following steps: ball-milling and mixing a silane coupling agent KH550 and titanium dioxide, and then adding the mixture into a mixture of the rest components to obtain a component B;
The preparation method of the impregnating adhesive comprises the following steps: mixing the raw materials of the component B and the component A to obtain impregnating adhesive;
the production process of the moistureproof impregnated paper comprises the following steps: coating the impregnating adhesive on the upper surface of the base paper substrate, and curing to obtain the moistureproof impregnated paper.
Example 2
The moistureproof impregnated paper comprises a base paper substrate and impregnating glue; the impregnating adhesive comprises a component A and a component B; the mass ratio of the component B to the component A is 1:5;
The component A comprises the following raw materials in parts by weight: 35 parts of polyurethane modified epoxy resin, 35 parts of epoxy modified acrylic resin, 12 parts of N-hydroxyethyl ethylenediamine, 0.07 part of dimethyl silicone oil and 2.5 parts of toughening agent CMP-410;
the component B comprises the following raw materials in parts by weight: 6 parts of polyamide wax, 2.5 parts of silicon dioxide, 0.7 part of sorbitol fatty acid ester, 0.4 part of silane coupling agent KH550 and 35 parts of methyl pyrrolidone;
The preparation method of the component B comprises the following steps: ball-milling and mixing a silane coupling agent KH550 and silicon dioxide, and then adding the mixture into a mixture of the rest components to obtain a component B;
The preparation method of the impregnating adhesive comprises the following steps: mixing the raw materials of the component B and the component A to obtain impregnating adhesive;
the production process of the moistureproof impregnated paper comprises the following steps: coating the impregnating adhesive on the upper surface of the base paper substrate, and curing to obtain the moistureproof impregnated paper.
Example 3
The moistureproof impregnated paper comprises a base paper substrate and impregnating glue; the impregnating adhesive comprises a component A and a component B; the mass ratio of the component B to the component A is 1:8;
the component A comprises the following raw materials in parts by weight: 45 parts of polyurethane modified epoxy resin, 45 parts of epoxy modified acrylic resin, 16 parts of dimethylaminopropylamine, 0.1 part of dimethyl silicone oil and 3 parts of toughening agent CMP-410;
The component B comprises the following raw materials in parts by weight: 8 parts of polyamide wax, 3 parts of silicon dioxide, 0.8 part of sorbitol fatty acid ester, 0.5 part of silane coupling agent KH550, 10 parts of N-propanol and 30 parts of N-methylpyrrolidone;
The preparation method of the component B comprises the following steps: ball-milling and mixing a silane coupling agent KH550 and silicon dioxide, and then adding the mixture into a mixture of the rest components to obtain a component B;
The preparation method of the impregnating adhesive comprises the following steps: mixing the raw materials of the component B and the component A to obtain impregnating adhesive;
the production process of the moistureproof impregnated paper comprises the following steps: coating the impregnating adhesive on the upper surface of the base paper substrate, and curing to obtain the moistureproof impregnated paper.
Example 4
The difference between this example and example 3 is only that the urethane-modified epoxy resin in the a-component was 18 parts and the epoxy-modified acrylic resin was 72 parts.
Example 5
The difference between this example and example 3 is only 36 parts of the urethane-modified epoxy resin and 54 parts of the epoxy-modified acrylic resin in the A-component.
Example 6
This example differs from example 3 only in that the polyurethane-modified epoxy resin in the a-component is 22.5 parts and the epoxy-modified acrylic resin is 67.5 parts.
Example 7
The only difference between this example and example 6 is that the silica was replaced with equal mass of titania.
Example 8
This example differs from example 6 only in that 0.3 parts of silica is replaced by titanium dioxide in the B component.
Example 9
This example differs from example 6 only in that 1.9 parts of silica are replaced by titania in the B component.
Example 10
This example differs from example 6 only in that 0.6 parts of silica is replaced by titania in the B component.
Example 11
This example differs from example 6 only in that 1.8 parts of silica are replaced by titania in the B component.
Comparative example 1
This example differs from example 3 only in that no silica is added to the B component.
Comparative example 2
This example differs from example 3 only in that no polyamide wax was added to the B component.
Comparative example 3
The only difference between this example and example 3 is that no component B is added to the impregnating compound.
Comparative example 4
The only difference between this example and example 3 is that the polyurethane modified epoxy resin in the a-component was replaced with an equal mass of epoxy modified acrylic resin.
Comparative example 5
The only difference between this example and example 3 is that the epoxy-modified acrylic resin in the a-component was replaced with an equal mass of polyurethane-modified epoxy resin.
The moisture-proof impregnated papers prepared in examples 1 to 11 and comparative examples 1 to 5 were weighed, recorded as the initial mass of the impregnated paper, taken out after immersing in a water tank at 30 ℃ for 48 hours, weighed after wiping off the surface water stains, recorded as the mass of the impregnated paper after immersing, and the water absorption of each example and each comparative example was calculated, and the water absorption= [ (mass of the impregnated paper after immersing-initial mass of the impregnated paper)/initial mass of the impregnated paper ] ×100% was calculated as shown in the following table:
The data of comparative examples 1-11 and comparative examples 1-5 show that the moisture-proof impregnated paper prepared in examples 1-11 has lower water absorption compared with comparative examples 1-5, which means that polyurethane modified epoxy resin and epoxy modified acrylic resin are compounded in the impregnating adhesive to form a denser network space, and meanwhile, the component B of the impregnating adhesive is dispersed into polyamide wax by adopting silicon dioxide and/or titanium dioxide nano particles, so that the moisture resistance of the moisture-proof impregnated paper can be remarkably improved.
The data of comparative examples 3 to 6 show that the moisture-proof impregnated paper prepared in examples 5 to 6 has lower water absorption rate than that of examples 3 to 4, indicating that the moisture resistance of the impregnating adhesive can be further improved by optimizing the mass ratio of the polyurethane modified epoxy resin to the epoxy modified acrylic resin.
The data of comparative examples 3 and examples 7-11 show that the moisture-proof impregnated papers prepared in examples 10-11 have lower water absorption than those prepared in examples 3 and examples 7-9, indicating that the moisture resistance of the impregnating adhesive can be further improved when the nanoparticles are silica and titania in a mass ratio of 4:1-6.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The moistureproof impregnated paper is characterized by comprising a base paper substrate and impregnating glue; the impregnating adhesive comprises a component A and a component B;
the component A comprises the following raw materials in parts by weight: 20-45 parts of polyurethane modified epoxy resin, 20-45 parts of epoxy modified acrylic resin, 8-16 parts of curing agent, 0.05-0.1 part of defoamer and 2-3 parts of flexibilizer;
the component B comprises the following raw materials in parts by weight: 4-8 parts of polyamide wax, 2-3 parts of nano particles, 0.5-0.8 part of emulsifying agent, 0.2-0.5 part of coupling agent and 30-40 parts of organic solvent;
the nano particles are silicon dioxide and/or titanium dioxide.
2. The moistureproof impregnated paper according to claim 1, wherein the mass ratio of the component B to the component a is 1:3-8.
3. The moistureproof impregnated paper according to claim 1, wherein the mass ratio of the polyurethane modified epoxy resin to the epoxy modified acrylic resin is 2:3-6.
4. The moisture-proof impregnated paper according to claim 1, wherein when the nano particles are silica and titania, the mass ratio of the silica to the titania is 4:1-6.
5. The moisture-resistant impregnated paper according to claim 1, wherein the preparation method of the B component comprises the steps of: and (3) ball-milling and mixing the coupling agent and the nano particles, and then adding the mixture into the mixture of the rest components to obtain the component B.
6. A moisture resistant impregnated paper according to claim 1, wherein the method of preparing the impregnating glue comprises the steps of: and mixing the raw materials of the component B and the component A to obtain the impregnating adhesive.
7. The moisture-resistant impregnated paper according to claim 1, wherein the curing agent is one of dimethylaminopropylamine and N-hydroxyethyl ethylenediamine; the defoaming agent is one of simethicone and lauryl phenylacetate; the toughening agent is one of CMP-410 and MX-257; the emulsifier is sorbitol fatty acid ester emulsifier.
8. A moisture-resistant impregnated paper according to claim 1, wherein said organic solvent is one or more of N-propanol, N-methylpyrrolidone, alkylbenzene; the coupling agent is a silane coupling agent.
9. The process for producing moisture-proof impregnated paper according to any one of claims 1 to 8, comprising the steps of: and coating the impregnating adhesive on the upper surface of the base paper substrate, and curing to obtain the moistureproof impregnated paper.
10. The process for producing moistureproof impregnated paper according to claim 9, wherein the coating amount of the impregnating adhesive is 10-15 g/m 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410135770.0A CN117926633A (en) | 2024-01-31 | 2024-01-31 | Dampproof impregnated paper and production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410135770.0A CN117926633A (en) | 2024-01-31 | 2024-01-31 | Dampproof impregnated paper and production process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117926633A true CN117926633A (en) | 2024-04-26 |
Family
ID=90764670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410135770.0A Pending CN117926633A (en) | 2024-01-31 | 2024-01-31 | Dampproof impregnated paper and production process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117926633A (en) |
-
2024
- 2024-01-31 CN CN202410135770.0A patent/CN117926633A/en active Pending
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