CN102002201A - Method for improving critical cracking thickness of PTFE (Polytetrafluoroethylene) resin emulsion and applications of modified PTFE resin emulsion to non-stick coatings - Google Patents
Method for improving critical cracking thickness of PTFE (Polytetrafluoroethylene) resin emulsion and applications of modified PTFE resin emulsion to non-stick coatings Download PDFInfo
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- CN102002201A CN102002201A CN2009101527302A CN200910152730A CN102002201A CN 102002201 A CN102002201 A CN 102002201A CN 2009101527302 A CN2009101527302 A CN 2009101527302A CN 200910152730 A CN200910152730 A CN 200910152730A CN 102002201 A CN102002201 A CN 102002201A
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Abstract
The invention relates to a method for improving the critical cracking thickness of PTFE (Polytetrafluoroethylene) resin emulsion. The method comprises the following step of: adding alkoxy silane to a PTFE resin emulsion under the conditions of normal temperature and normal pressure, stirring and uniformly mixing to obtain modified PTFE resin emulsion for coating, wherein the alkoxy silane has a general formula: R'y Si(OR)4-y, R' is phenyl, methyl or ethyl, OR is methoxy or ethoxy, y is 0 or 1, and the addition of the alkoxy silane is 2.5-15 percent by weight of the solid content (weight) of the PTFE resin emulsion. The modified PTFE resin emulsion is coated on a priming coat to obtain a non-stick coating through sintering, and the non-stick coating has the critical cracking thickness of at least 15 mum. The invention is suitable for preparing non-stick coating materials.
Description
Technical field
The present invention relates to the method for a kind of raising teflon resin emulsion Critical Cracking thickness (being critical film thickness), and the non-sticky metallic coating that obtains thus.
Background technology
Fluoro-resin is a family macromolecule polymkeric substance that contains fluorine atom in the molecular structure, have excellent high and low temperature resistance, dielectric properties, chemical stability, weathering resistance, uninflammability, non-viscosity and low characteristics such as frictional coefficient, be national economy all departments, the indispensable important materials of top science technology and national defense industry particularly.The principal item of fluoro-resin has polytetrafluoroethylene (PTFE), voltalef (PCTFE), polyvinylidene difluoride (PVDF) (PVDF), ethylene-tetrafluoroethylene copolymer (ETFE), ethylene-chlorotrifluoro-ethylene copolymer (ECTFE), fluorinated ethylene propylene (PVF), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (to be commonly called as Meltability polytetrafluorethyletubular, PFA), tetrafluoraoethylene-hexafluoropropylene copolymer (is commonly called as fluoroplastic 46, FEP), hexafluoropropylene (HFP)/tetrafluoroethylene (TFE)-perfluoroalkyl vinyl ether multipolymer etc.
1958 is that (following fluoro-resin removes and specializes the water-based fluororesin made of main raw material with the teflon resin emulsion, refer in particular to the teflon resin emulsion) since non-viscous paint comes out, just be widely used in every field such as cooker, household electrical appliance, anti-chemical burn into industry accessory with its unique physical and chemical performances, the market annual requirement of present only China's non-viscous paint is about 20000t.
But because fluoro-resin is when changing through heat drying and refrigerative continuous temperature, the stress relaxation of fluoro-resin molecular chain is unable to catch up with variation of temperature, will be in the inner unrelieved stress that produces of polymkeric substance.Especially the convergent force acting in conjunction on surface in unrelieved stress and the drying process in the middle of upper layer will crack when this reactive force surpasses the tensile strength of material.In addition in the industrial processes process, because the melt viscosity of fluoro-resin is very high, even under molten state, also can't flow, so the volume that can't well fill up in sintering process reduces and the space.The Critical Cracking thickness of fluoro-resin emulsion (being called for short critical film thickness among the present invention) is defined as the fluororesin-coated the highest dry film coating thickness that can reach of single under the situation that crackle do not occur.Fluoro-resin critical film thickness value is big more, and it is thick more to show that this fluororesin coating film can apply, and its preeminent performance more can obtain embodying.
So far non-viscous paint manufacturer does not have good method to solve the fluoro-resin critical film thickness problem of non-viscous paint coating (upper layer or middle layer), makes watersoluble fluor resin non-stick paint have shortcoming and limitation at aspects such as outward appearance, operability, erosion resistances.
Summary of the invention
The present invention is in order to solve the little problem of fluoro-resin Critical Cracking film thickness value in the prior art, a kind of method and the application of modified polytetrafluoroethylresin resin emulsion on non-sticky metallic coating that improves teflon resin emulsion Critical Cracking thickness of the present invention is provided for this reason, the method of the invention can effectively improve teflon resin emulsion Critical Cracking film thickness value, method of the present invention provides a kind of modified polytetrafluoroethylresin resin emulsion, applies the non-sticky metallic coating that obtains with this modified polytetrafluoroethylresin resin emulsion and has superperformance.
Its special character of the technical solution used in the present invention is that organoalkoxysilane is added under normal temperature and pressure conditions in the teflon resin emulsion, stirs all and mixes, and obtains the modified polytetrafluoroethylresin resin emulsion and is used to film, and described organoalkoxysilane general formula is: R '
ySi (OR)
4-y, wherein R ' is phenyl, methyl or ethyl, OR is a methoxy or ethoxy, y=0 or 1; Described organoalkoxysilane addition is 2.5～15% of teflon resin emulsion solid content (weight) by weight.
Described organoalkoxysilane is tetramethoxy-silicane, tetraethoxysilane, phenyltrimethoxysila,e, phenyl triethoxysilane, methyltrimethoxy silane, Union carbide A-162, ethyl trimethoxy silane or ethyl triethoxysilane.
Described organoalkoxysilane is preferably methyltrimethoxy silane.
It is with 10～20 rev/mins of mixing speed that stirring of the present invention all mixes, and churning time was advisable in 30～50 minutes.
The application of modified polytetrafluoroethylresin resin emulsion of the present invention on non-sticky metallic coating, its special character are to be coated on described modified polytetrafluoroethylresin resin emulsion that sintering obtains non-sticky metallic coating on the undercoat.
Described sintering is to toast 5～10 minutes down at 380 ℃～400 ℃.
The inventor finds after deliberation, (following fluoro-resin removes and specializes to add organoalkoxysilane to exist with the water dispersion form fluoro-resin under normal temperature and pressure conditions, refer in particular to the teflon resin emulsion) in low speed (10～20 rev/mins) stir and (to avoid quick, prevent emulsion breaking) 30～50 minutes, organoalkoxysilane can slowly hydrolysis and part condensation in water, further condensation forms the network nano structure particle in the fluoro-resin drying process, in fluoro-resin, play support, coat and fill up effect, buffering and elimination fluoro-resin internal residual stress, thus fluoro-resin Critical Cracking thickness improved.Described organoalkoxysilane addition is 2.5～15% of fluoro-resin solid content (weight) by weight; Less than 2.5% o'clock, its network nano structure particle can not well play support, the effect that coats and fill up, and it is not obvious to improve fluoro-resin Critical Cracking thickness; Greater than 15% o'clock, fluoro-resin Critical Cracking thickness did not have obvious increase.The critical film thickness value of fluoro-resin emulsion is generally 8～10 μ m, and after adding organoalkoxysilane, its critical film thickness value can be increased to more than the 15 μ m, reaches as high as about 35 μ m.Concrete reaction mechanism is as follows:
Hydrolysis reaction:
R’
ySi(OR)
4-y+H
2O→R’
ySi(OH)(OR)
3-y+ROH
Polycondensation:
2R’
ySi(OH)(OR)
3-y→R’
ySi(OR)
3-yOSi(OR)
3-y?R’
y+H
2O
Described organoalkoxysilane is preferably tetramethoxy-silicane, tetraethoxysilane, phenyltrimethoxysila,e, phenyl triethoxysilane, methyltrimethoxy silane, Union carbide A-162, ethyl trimethoxy silane, ethyl triethoxysilane.R ' is good to select methyl, ethyl, phenyl, because during R ' carbon chain length, though help improving the fluoro-resin critical film thickness, temperature tolerance is relatively poor; The selection of R mainly is to consider the speed of hydrolysis and the factors such as price of raw material, takes all factors into consideration organoalkoxysilane preferable methyl Trimethoxy silane of the present invention.
The invention still further relates to a kind of no-stick coating, be that to add by water-based fluororesin of the present invention that organoalkoxysilane gained modified fluorin resin emulsion is coated on by high-temperature adhesives be that sintering obtains on the undercoat of main component, the Critical Cracking thickness of this no-stick coating is greater than 15 μ m.
Described high-temperature adhesives are a kind of of following polymers or wherein two kinds: polyamidoimide (PAI), polyethersulfone (PES), polyphenylene sulfide (PPS).
The Critical Cracking thickness of described non-sticky metallic coating is 15～36 μ m.
According to the inventive method, the modified polytetrafluoroethylresin resin emulsion of described interpolation organoalkoxysilane can apply on the described non-sticky metallic coating after the high temperature film forming once more, can not produce defectives such as sticking power is bad.
Beneficial effect of the present invention is mainly reflected in: organoalkoxysilane is added in the fluoro-resin, can obviously improve the Critical Cracking thickness of watersoluble fluor resin non-stick coating, thereby realize thick being coated with of watersoluble fluor resin non-stick coating surface layer, effectively improve the performances such as outward appearance, operability, erosion resistance of non-sticky metallic coating.
Embodiment
The present invention is described further below in conjunction with specific embodiment, but protection scope of the present invention is not limited in this:
Fluoro-resin critical film thickness value testing method:
Single application fluorine tree refers to coating, and---sintering obtains dry film, and---80 times of lens examination coating cracking situations---are surveyed thickness---and get that maximum film thickness is the critical film thickness value under the no cracking situation.
Water-based fluorine tree refers to non-sticky metallic coating finishing coat critical film thickness value testing method:
------------to deduct priming coat thickness gained maximum film thickness be aqueous non-viscous coat side coating critical film thickness value to the non-sticking lining thickness to 380 ℃ of sintering 5 minutes under 80 times of lens examination no-stick coatings cracking situations---were surveyed priming coat thickness (priming coat that does not have the coated side coating), non-sticking lining thickness (comprising priming coat and finishing coat)---and got without the cracking situation at priming coat spraying no-stick coating exposed part priming coat (being the uncoated finishing coat of part priming coat) simultaneously for 150 ℃ of sintering 5 minutes and cool to room temperature to spray not sticky end coating (oil W-2166 at the bottom of the Jinhua PengFuLong Science Co., Ltd).
Comparative Examples 1
Get 100 parts of (solid content 60%) PTFE emulsions, according to the operation of the testing method of aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtaining the critical film thickness value is 8～9 μ m.
Comparative Examples 2
Get 100 parts of non-sticky metallic coating face oil (Jinhua PengFuLong Science Co., Ltd face oil W-31009), according to the testing method operation of aforementioned critical film thickness, sintering condition be 380 ℃ 5 minutes, obtaining the critical film thickness value is 10 μ m～12 μ m.
Jinhua PengFuLong Science Co., Ltd's face oil W-31009 prescription is as follows:
PTFE emulsion (solid content 60%) 66.0
PFA emulsion (solid content 60%) 8.0
Pearly pigment 2.2
Heatproof pigment 0.3
Auxiliary agent 1.0～12.0
Water 11.5～22.5
Add up to 100.0
Oil W-2166 prescription is as follows at the bottom of the Jinhua PengFuLong Science Co., Ltd:
PTFE emulsion (solid content 60%) 28.0
PAI resin (solid content 30%) 25
Heatproof color stuffing 5
Auxiliary agent 0.5～5.0
Water 41.5～37.0
Add up to 100.0
Embodiment 1
Get the PTFE emulsion (solids content that is equivalent to PTFE is 100 parts) of 166.7 part of 60% content, add 2.5 parts of methyltrimethoxy silanes, stirred 50 minutes with 10 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtaining the critical film thickness value is 15～18 μ m.
Embodiment 2
Get the PTFE emulsion (solids content that is equivalent to PTFE is 100 parts) of 166.7 part of 60% content, add 5 parts of methyltrimethoxy silanes, stirred 40 minutes with 10 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtaining the critical film thickness value is 20～21 μ m.
Embodiment 3
Get the PTFE emulsion (solids content that is equivalent to PTFE is 100 parts) of 166.7 part of 60% content, add 7.5 parts of methyltrimethoxy silanes, stirred 30 minutes with 10 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtaining the critical film thickness value is 25～28 μ m.
Embodiment 4
Get the PTFE emulsion (solids content that is equivalent to PTFE is 100 parts) of 166.7 part of 60% content, add 10 parts of methyltrimethoxy silanes, stirred 50 minutes with 15 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtaining the critical film thickness value is 29～31 μ m.
Embodiment 5
Get the PTFE emulsion (solids content that is equivalent to PTFE is 100 parts) of 166.7 part of 60% content, add 12.5 parts of methyltrimethoxy silanes, stirred 40 minutes with 15 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtaining the critical film thickness value is 30～34 μ m.
Embodiment 6
Get the PTFE emulsion (solids content that is equivalent to PTFE is 100 parts) of 166.7 part of 60% content, add 15 parts of methyltrimethoxy silanes, stirred 30 minutes with 20 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtaining the critical film thickness value is 33～36 μ m.
Embodiment 7
Get the PTFE emulsion (solids content that is equivalent to PTFE is 100 parts) of 166.7 part of 60% content, add 18 parts of methyltrimethoxy silanes, stirred 50 minutes with 20 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtaining the critical film thickness value is 34～35 μ m.
Illustrate that by embodiment 1～7 and Comparative Examples 1 the methyltrimethoxy silane addition in 2.5～18% of fluoro-resin weight (calculating by containing composition admittedly), can obviously improve the fluoro-resin critical film thickness.Preferable addition 2.5%～15%, preferred 7.5%～15%.
Embodiment 8
Get 100 parts of non-sticky metallic coating face oil (the face oil W-31009 of Jinhua PengFuLong Science Co., Ltd), adding the methyltrimethoxy silane umber is 2.5% of water-based fluororesin solids content, stirred 50 minutes with 20 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtain the critical film thickness value for (experimental value) 16～19 μ m.
Embodiment 9
Get 100 parts of non-sticky metallic coating face oil (the face oil W-31009 of Jinhua PengFuLong Science Co., Ltd), adding the methyltrimethoxy silane umber is 5% of water-based fluororesin solids content, stirred 40 minutes with 20 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtain the critical film thickness value for (experimental value) 21～23 μ m.
Embodiment 10
Get 100 parts of non-sticky metallic coating face oil (the face oil W-31009 of Jinhua PengFuLong Science Co., Ltd), adding the methyltrimethoxy silane umber is 7.5% of water-based fluororesin solids content, stirred 30 minutes with 20 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtain the critical film thickness value for (experimental value) 27～30 μ m.
Embodiment 11
Get 100 parts of non-sticky metallic coating face oil (the face oil W-31009 of Jinhua PengFuLong Science Co., Ltd), adding the methyltrimethoxy silane umber is 10% of water-based fluororesin solids content, stirred 50 minutes with 10 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtain the critical film thickness value for (experimental value) 30～33 μ m.
Embodiment 12
Get 100 parts of non-sticky metallic coating face oil (the face oil W-31009 of Jinhua PengFuLong Science Co., Ltd), adding the methyltrimethoxy silane umber is 12.5% of water-based fluororesin solids content, stirred 40 minutes with 10 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtain the critical film thickness value for (experimental value) 32～35 μ m.
Embodiment 13
Get 100 parts of non-sticky metallic coating face oil (the face oil W-31009 of Jinhua PengFuLong Science Co., Ltd), adding the methyltrimethoxy silane umber is 15% of water-based fluororesin solids content, stirred 30 minutes with 10 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtain the critical film thickness value for (experimental value) 34～37 μ m.
Embodiment 14
Get 100 parts of non-sticky metallic coating face oil (the face oil W-31009 of Jinhua PengFuLong Science Co., Ltd), adding the methyltrimethoxy silane umber is 18% of water-based fluororesin solids content, stirred 40 minutes with 15 rev/mins, testing method operation according to aforementioned critical film thickness value, sintering condition be 380 ℃ 5 minutes, obtain the critical film thickness value for (experimental value) 35～37 μ m.
Illustrate that by embodiment 8～14 and Comparative Examples 2 the methyltrimethoxy silane additions in 2.5～18% of fluoro-resin weight (calculating by containing composition admittedly), can obviously improve watersoluble fluor resin non-stick coat side coating critical film thickness.Preferable addition 2.5%～15%, preferred 7.5%～15%.The specific performance contrast sees Table one.
Table one:
Attached one
The erosion resistance testing method
The present invention tests erosion resistance as follows.
According to embodiment 8～14 and Comparative Examples 2 is finishing coat, undercoat is Jinhua PengFuLong Science Co., Ltd's prescription: PAI/PTFE (solid content)=30/70, base material is No. 45 sand sanding aluminium sheets, size is 8CM*10CM, thickness is 0.15CM, and 380 ℃ of sintering conditions 5 minutes are made 3 on model, boil (6 hours is one-period) after drawing 10mm * 10mm lattice in 10% salt solution, observing also, the record coating shedding bubbles the time (three model mean value).
After organoalkoxysilane was added in table one explanation, non-viscous paint surface layer critical film thickness improved, and can realize thick being coated with, and improved operability, corrosion resistance nature and apparent glossiness.
Claims (6)
1. method that improves teflon resin emulsion Critical Cracking thickness, it is characterized in that under normal temperature and pressure conditions, adding to organoalkoxysilane in the teflon resin emulsion, stir all and mix, obtain the modified polytetrafluoroethylresin resin emulsion and be used to film, described organoalkoxysilane general formula is: R '
ySi (OR)
4-y, wherein R ' is phenyl, methyl or ethyl, OR is a methoxy or ethoxy, y=0 or 1; Described organoalkoxysilane addition is 2.5～15% of teflon resin emulsion solid content (weight) by weight.
2. the method for claim 1 is characterized in that described organoalkoxysilane is tetramethoxy-silicane, tetraethoxysilane, phenyltrimethoxysila,e, phenyl triethoxysilane, methyltrimethoxy silane, Union carbide A-162, ethyl trimethoxy silane or ethyl triethoxysilane.
3. the method for claim 1 is characterized in that described organoalkoxysilane is a methyltrimethoxy silane.
4. as claim 1,2 or 3 described methods, it is characterized in that it is 10～20 rev/mins of mixing speed that described stirring all mixes, churning time 30～50 minutes.
5. as claim 1,2 or 3 application of described modified polytetrafluoroethylresin resin emulsion on non-sticky metallic coating, it is characterized in that being coated on the undercoat with described modified polytetrafluoroethylresin resin emulsion and obtain non-sticky metallic coating through sintering, this non-sticky metallic coating Critical Cracking thickness is at least 15 μ m.
6. application as claimed in claim 5 is characterized in that described sintering is to toast 5～10 minutes down at 380 ℃～400 ℃.
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| CN103819977A (en) * | 2013-12-23 | 2014-05-28 | 杭州吉华高分子材料有限公司 | Non-stick paint and preparation method thereof |
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| CN111548589A (en) * | 2020-06-11 | 2020-08-18 | 四川大学 | High-filling-amount polytetrafluoroethylene composite film and preparation method thereof |
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| US11230648B2 (en) | 2016-10-24 | 2022-01-25 | Saint-Gobain Performance Plastics Corporation | Polymer compositions, materials, and methods of making |
| CN107523153A (en) * | 2017-09-06 | 2017-12-29 | 巨化集团技术中心 | A kind of non-viscous paint additive |
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| CN111548589A (en) * | 2020-06-11 | 2020-08-18 | 四川大学 | High-filling-amount polytetrafluoroethylene composite film and preparation method thereof |
| CN116891660A (en) * | 2023-03-24 | 2023-10-17 | 浙江绍兴苏泊尔生活电器有限公司 | Non-stick coating, preparation method thereof, non-stick inner pot and cooking utensil |
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Denomination of invention: Method for improving critical cracking thickness of PTFE (Polytetrafluoroethylene) resin emulsion and applications of modified PTFE resin emulsion to non-stick coatings Effective date of registration: 20171201 Granted publication date: 20120905 Pledgee: Agricultural Bank of China, Limited by Share Ltd, Jinhua Wucheng branch Pledgor: Zhejiang Pfluon Technology Co., Ltd. Registration number: 2017330000207 |
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Address after: 321016 No.588, Huatai Road, New District, Jinpan Development Zone, Jinhua City, Zhejiang Province Patentee after: Zhejiang Pengfulong Science and Technology Co.,Ltd. Address before: 321016 No.588, Huatai Road, New District, Jinpan Development Zone, Jinhua City, Zhejiang Province Patentee before: ZHEJIANG PFLUON TECHNOLOGY Co.,Ltd. |
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Date of cancellation: 20211201 Granted publication date: 20120905 Pledgee: Agricultural Bank of China Limited by Share Ltd. Jinhua Wucheng branch Pledgor: ZHEJIANG PFLUON TECHNOLOGY Co.,Ltd. Registration number: 2017330000207 |