CN102337705A - Method for improving stability of curtain utilized in curtain coating - Google Patents
Method for improving stability of curtain utilized in curtain coating Download PDFInfo
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- CN102337705A CN102337705A CN2010102317821A CN201010231782A CN102337705A CN 102337705 A CN102337705 A CN 102337705A CN 2010102317821 A CN2010102317821 A CN 2010102317821A CN 201010231782 A CN201010231782 A CN 201010231782A CN 102337705 A CN102337705 A CN 102337705A
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- Prior art keywords
- coating
- curtain
- pva
- improving stability
- thickener
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000007766 curtain coating Methods 0.000 title abstract 5
- 238000000576 coating method Methods 0.000 claims abstract description 93
- 239000011248 coating agent Substances 0.000 claims abstract description 79
- 239000002562 thickening agent Substances 0.000 claims abstract description 21
- 239000000049 pigment Substances 0.000 claims abstract description 19
- 241000276489 Merlangius merlangus Species 0.000 claims description 7
- 238000006136 alcoholysis reaction Methods 0.000 claims description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000005995 Aluminium silicate Substances 0.000 claims 1
- 235000012211 aluminium silicate Nutrition 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002518 antifoaming agent Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- 239000004816 latex Substances 0.000 description 4
- 229920000126 latex Polymers 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- 230000002940 repellent Effects 0.000 description 4
- 239000005871 repellent Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000008199 coating composition Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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- Application Of Or Painting With Fluid Materials (AREA)
- Paper (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a method for improving stability of a curtain utilized in curtain coating. The method relates to a use of a thickening agent in the field of papermaking coatings. Papermaking coatings which comprise mainly pigments have poor coating ductility and thus a curtain is extremely easy to be broken during curtain coating. The method provided by the invention adopts a thickening agent who is added into coatings to improve the ductility of the coatings, and thus improving stability of a curtain. The method is characterized in that a use amount of a thickening agent is large and coating ductility is improved obviously. Therefore, the method is beneficial for improving stability of a curtain utilized in curtain coating and at a low coating speed, improves tensile resistance of a curtain when the curtain contacts with a paper web, and guarantees normal curtain coating operation.
Description
Technical field
The present invention relates to of the application of a kind of thickener in the papermaking paint field.Specifically be that PVA is used in the curtain formula coating that is the master as thickener with pigment, to improve curtain stability.
Background technology
In recent years, along with development economic and technology, people were increasing to the demand of coated paper, and were increasingly high to the quality requirement of coated paper.The continuous development of coating technique makes the coating speed of a motor vehicle of traditional coating method such as scraper coating method, film transfer coated mode etc. obtain significant raising.Meanwhile, various coating methods can expose some runnability problems and some paper defects problems under the high speed of a motor vehicle.For example in the scraper coating method, the high speed of a motor vehicle can increase pressure load, the acceleration blade wears of scraper; The coating scratch can occur, cause problems such as percent defective rising and coating lack of homogeneity.For film transfer coated mode, the high speed of a motor vehicle can cause nip coating to splash and transition range coating atomizes, produces problems such as orange peel line.
The coating of curtain formula has obtained development rapidly as a kind of contactless coating method.The coating of curtain formula is a kind of coating method that adopts preparatory measurement Law accurately to be coated with, and when improving coating speed, has avoided the runnability and the paper defects problem that occur in scraper and the film transfer coated process.The curtain that is characterized in free-falling produces impact to bodystock paper, under high impact velocity condition, the irregular paper web in surface is applied one deck fluid film, forms uniform coating.In the curtain formula coating method, curtain stability is the key factor of influence coating runnability and coating quality.Curtain stability missionary society causes the curtain fracture, causes coating process normally to carry out.
Coating flow, the coating speed of a motor vehicle, coating extension viscosity etc. are some principal elements that influence curtain stability in the coating of curtain formula.With pigment be main conventional application of paints in the coating of curtain formula because the coating poor ductility, curtain very easily breaks during the coating of curtain formula, this just requires curtain must have enough good stretch-proof ability, just coating will have good extension viscosity.Under certain condition, the stability of curtain can be stablized along with the increase of extension viscosity.The extension viscosity of coating can be tested through high shear viscosity tester ACAV; Simultaneously; The extension characteristics that also can reflect coating aborning through the I operations flows amount of curtain formula coating curtain, promptly I operations flows amount is more little, and the stability of curtain is good more.How to improve curtain stability through suitable increase coating extension viscosity is the problem that needs solution.
Summary of the invention
Be main papermaking paint when utilizing curtain formula coating method to be coated with pigment, because the coating poor ductility, curtain very easily breaks during the coating of curtain formula, and this just requires curtain must have enough good stretch-proof ability, and just coating will have good extension viscosity.The present invention promptly adds PVA as thickener through improving the extension characteristics of coating in coating, be the application during main curtain formula is coated with pigment, improves the stability of curtain.The consumption that it is characterized in that thickener PVA is big; The extension viscosity of coating increases along with the increase of thickener PVA consumption, and along with the increase of consumption, and the amplitude that having added the extension viscosity of the coating of thickener PVA increases increases gradually.The increase of thickener consumption is beneficial to the raising of curtain formula coating curtain stability, and the stretch-proof ability in the time of can improving curtain simultaneously and contact with paper web is beneficial to and improves the behavior in service that the curtain formula is coated with.Through the adding of thickener PVA, can improve the Euler number more than 2, I operations flows amount has reduced by 36.5%, obviously improves the stability of curtain.
Through adding PVA, improve the extension viscosity in the coating, under low coating speed, as being coated with speed of a motor vehicle 150m/min～800m/min, coating weight at 10～20g/m
2Under the situation, can obtain stable curtain, guarantee the normal operation of curtain formula coating.The consumption that the present invention has demonstrated fully thickener PVA is big, and amount ranges is 1.5～3.0 parts to the consumption of 100 parts of pigment, the alcoholysis degree 88%～99% of used PVA, and the degree of polymerization is 1700.The used coating of the present invention is water paint, and as main pigment, pigment＜2 μ m particle diameter mass percents are respectively 95% and 96% with coarse whiting and china clay.In the coating, coarse whiting and china clay proportion are 100: 0～60: 40; Latex is 15 parts to the consumption of 100 parts of pigment; Dispersant dosage is 0.15 part; Lubricant quantity is 0.7 part; The water repellent agent consumption is 0.5 part; The antifoaming agent consumption is 0.3 part.
Before the batching, PVA is dissolved under 95 ℃ by 8% concentration, the PVA temperature drops to room temperature and prepares burden.Utilize dispersion machine to prepare burden, add pigment, dispersant, PVA, latex, lubricant, water repellent agent, antifoaming agent successively.The coating solid content for preparing is 55～60%; The coating low-shear viscosity is 1400～2500mpas; Characterize the extension viscosity with the Euler coefficient, its numerical value greater than 2 o'clock curtains stability better, curtain stability increases and improves with the Euler coefficient, but too high meeting obviously increases the low-shear viscosity of coating, influences the preparation and the application of coating; Can reflect the extension characteristics of coating in the production through I operations flows amount, promptly I operations flows amount is more little, and the stability of curtain is good more.I operations flows amount is generally at 1～2cm
2/ s.I operations flows amount is under the unit curtain formula coating die head length, can normally be coated with the minimum discharge of paper.
Conventional coating such as scraper coating method or film transfer coated mode are used is seldom to add PVA as thickener in the coating of main body with pigment, has promptly used, and its consumption can be above 0.5 part yet.Mainly be that the coating that contains PVA has obviously high high shear viscosity.In curtain formula coating composition, utilized the high ductibility of PVA can increase the stretch-proof ability when curtain contacts with paper web just, guarantee to produce continual and steady carrying out.
Description of drawings
Fig. 1: embodiment 1, conventional coating and the contrast of curtain formula coating extension characteristics
Fig. 2: embodiment 2, curtain formula coating extension characteristics
The specific embodiment
As pigment, pigment＜2 μ m particle diameter mass percents are respectively 95% and 96% with coarse whiting and china clay.Thickener is PVA 1788, and its alcoholysis degree is 88%, and the degree of polymerization is 1700.Powdered whiting and kaolinic ratio are 80: 20.In order to contrast, select conventional formulation for coating material and curtain formula coating composition prescription respectively, wherein the consumption of thickener PVA is respectively 0.5 part, 1.5 parts.According to the batching program, add pigment, 0.08 part of dispersant, PVA, 15 parts in latex, 0.7 part of lubricant, 0.5 part of water repellent agent, 0.3 part of antifoaming agent successively, two kinds of coating solid contents are 60%.Curtain formula coating low-shear viscosity is 1640mPas.Utilize the extension characteristics of two kinds of coating of ACAV high shear tester test respectively.Conventional coating Euler number is less than 2, and curtain formula coating is about 2.5, and test curve is seen accompanying drawing 1.The coating that configures is put into feeder, and coating gets into curtain formula coating slit die capitiform through screw pump and becomes curtain.Test I operations flows amount, the I operations flows amount of conventional coating is 2.44cm
2/ s, the I operations flows amount of curtain formula coating is 1.55cm
2/ s.Can find out, in curtain formula coating, use as thickener with 1.5 parts of PVA, compare with conventional coating that its I operations flows amount has reduced by 36.5%, the Euler number also obviously improves.It is thus clear that the stability of the coating curtain of 1.5 parts of thickener PVA obviously improves.
With coarse whiting is main pigment, and pigment＜2 μ m particle diameter mass percents are 95%.Thickener is PVA 1799, and its alcoholysis degree is 99%, and the degree of polymerization is 1700.The consumption of the thickener PVA that adopts is 3.0 parts.According to the batching program, add pigment, 0.08 part of dispersant, PVA3.0 part, 13 parts in latex, 0.7 part of lubricant, 0.5 part of water repellent agent, 0.3 part of antifoaming agent successively, two kinds of coating solid contents are 60%.The coating low-shear viscosity is 2100mPas.Utilize the extension characteristics of ACAV high shear tester test curtain formula coating.Curtain formula coating is more than 3.5, and coating has curtain stability preferably.Test curve is seen accompanying drawing 2.
Claims (7)
1. a method that is used to improve curtain formula coating curtain stability is characterized in that Using P VA is as thickener in the curtain formula coating that with pigment is the master, and its consumption is 1.5～3.0 parts.
2. the method for claim 1, the alcoholysis degree that it is characterized in that used thickener PVA is 88～99%, the degree of polymerization is 1700.
3. the method for claim 1, the main pigment that it is characterized in that coating is coarse whiting, kaolin.
4. the method for claim 1 is characterized in that coarse whiting and kaolinic ratio range are 100: 0～60: 40.
5. the method for claim 1, the range of solid content that it is characterized in that preparing coating is 55～60%.
6. the method for claim 1 is characterized in that the low-shear viscosity scope 1400～2500mPas of coating.
7. the method for claim 1, it is characterized in that being coated with vehicle speed range is 150～800m/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010231782 CN102337705B (en) | 2010-07-20 | 2010-07-20 | Method for improving stability of curtain utilized in curtain coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010231782 CN102337705B (en) | 2010-07-20 | 2010-07-20 | Method for improving stability of curtain utilized in curtain coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102337705A true CN102337705A (en) | 2012-02-01 |
| CN102337705B CN102337705B (en) | 2013-07-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010231782 Active CN102337705B (en) | 2010-07-20 | 2010-07-20 | Method for improving stability of curtain utilized in curtain coating |
Country Status (1)
| Country | Link |
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| CN (1) | CN102337705B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105730038A (en) * | 2016-02-19 | 2016-07-06 | 中国制浆造纸研究院 | Method for producing ink-jet printing substrate in curtain type coating manner |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3793067A (en) * | 1972-06-16 | 1974-02-19 | Lowe Paper Co | Food release coating |
| CN101014418A (en) * | 2004-09-09 | 2007-08-08 | 艾利丹尼森公司 | Curtain coating method |
| CN101537402A (en) * | 2008-03-17 | 2009-09-23 | 株式会社理光 | Curtain coating apparatus and curtain coating method |
-
2010
- 2010-07-20 CN CN 201010231782 patent/CN102337705B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3793067A (en) * | 1972-06-16 | 1974-02-19 | Lowe Paper Co | Food release coating |
| CN101014418A (en) * | 2004-09-09 | 2007-08-08 | 艾利丹尼森公司 | Curtain coating method |
| CN101537402A (en) * | 2008-03-17 | 2009-09-23 | 株式会社理光 | Curtain coating apparatus and curtain coating method |
Non-Patent Citations (2)
| Title |
|---|
| 孙军等: "帘式涂布中幕帘稳定性的影响因素", 《中国造纸》 * |
| 孙军等: "表面活性剂在帘式涂布中的应用", 《中国造纸》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105730038A (en) * | 2016-02-19 | 2016-07-06 | 中国制浆造纸研究院 | Method for producing ink-jet printing substrate in curtain type coating manner |
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| Publication number | Publication date |
|---|---|
| CN102337705B (en) | 2013-07-31 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C53 | Correction of patent of invention or patent application | ||
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Address after: 100102, Beijing Wangjing science and Technology Park, Chaoyang District No. 4 Yang Lu, No. 302 light building, room 3 Applicant after: CHINA NATIONAL PULP AND PAPER Research Institute Address before: 100032 Beijing city Chongwen District No. 7 South off the 5 floor of the Warwick International Apartments room 1510 Applicant before: CHINA NATIONAL PULP AND PAPER Research Institute |
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| TR01 | Transfer of patent right |
Effective date of registration: 20170527 Address after: 212132 Zhenjiang Province, Zhenjiang New District Dagang mountain road, No. five, No. 99 Patentee after: JIANGSU WANBAO RUIDA HIGH-NEW TECHNOLOGY CO.,LTD. Address before: 100102, Beijing Wangjing science and Technology Park, Chaoyang District No. 4 Yang Lu, No. 302 light building, room 3 Patentee before: CHINA NATIONAL PULP AND PAPER Research Institute |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A method for improving the stability of curtain coating curtain Effective date of registration: 20210705 Granted publication date: 20130731 Pledgee: Zhenjiang New District SME Financing Guarantee Co.,Ltd. Pledgor: JIANGSU WANBAO RUIDA HIGH-NEW TECHNOLOGY Co.,Ltd. Registration number: Y2021980005716 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 212000 No. 86, Dagang Wufengshan Road, Zhenjiang New Area, Zhenjiang City, Jiangsu Province Patentee after: JIANGSU WANBAO RUIDA HIGH-NEW TECHNOLOGY CO.,LTD. Address before: No.99, Wufengshan Road, Dagang, Zhenjiang New District, Zhenjiang City, Jiangsu Province Patentee before: JIANGSU WANBAO RUIDA HIGH-NEW TECHNOLOGY CO.,LTD. |