CN116855146A - Strippable coating with strong room temperature oxidant resistance, manufacturing method and coating structure - Google Patents
Strippable coating with strong room temperature oxidant resistance, manufacturing method and coating structure Download PDFInfo
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- CN116855146A CN116855146A CN202210930503.3A CN202210930503A CN116855146A CN 116855146 A CN116855146 A CN 116855146A CN 202210930503 A CN202210930503 A CN 202210930503A CN 116855146 A CN116855146 A CN 116855146A
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- 238000000576 coating method Methods 0.000 title claims abstract description 115
- 239000011248 coating agent Substances 0.000 title claims abstract description 110
- 239000007800 oxidant agent Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 230000001590 oxidative effect Effects 0.000 title claims description 22
- 229920001971 elastomer Polymers 0.000 claims abstract description 85
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 53
- 239000002904 solvent Substances 0.000 claims abstract description 40
- 238000002156 mixing Methods 0.000 claims abstract description 32
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000005011 phenolic resin Substances 0.000 claims abstract description 27
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 27
- 229920005989 resin Polymers 0.000 claims abstract description 22
- 239000011347 resin Substances 0.000 claims abstract description 22
- 238000007670 refining Methods 0.000 claims abstract description 18
- 238000011049 filling Methods 0.000 claims abstract description 12
- 239000010410 layer Substances 0.000 claims description 46
- 238000000034 method Methods 0.000 claims description 28
- 238000002360 preparation method Methods 0.000 claims description 19
- 230000007704 transition Effects 0.000 claims description 13
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Natural products CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 12
- 239000006185 dispersion Substances 0.000 claims description 12
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical group [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 12
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 12
- 235000019792 magnesium silicate Nutrition 0.000 claims description 12
- 239000000391 magnesium silicate Substances 0.000 claims description 12
- 239000000049 pigment Substances 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 239000002344 surface layer Substances 0.000 claims description 11
- 239000003513 alkali Substances 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000002585 base Substances 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 7
- CYTYCFOTNPOANT-UHFFFAOYSA-N Perchloroethylene Chemical group ClC(Cl)=C(Cl)Cl CYTYCFOTNPOANT-UHFFFAOYSA-N 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 229950011008 tetrachloroethylene Drugs 0.000 claims description 6
- 125000003944 tolyl group Chemical group 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 238000005238 degreasing Methods 0.000 claims description 2
- 239000003973 paint Substances 0.000 abstract description 28
- 230000003647 oxidation Effects 0.000 abstract description 9
- 238000007254 oxidation reaction Methods 0.000 abstract description 9
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000011253 protective coating Substances 0.000 description 28
- 230000008569 process Effects 0.000 description 12
- 239000007788 liquid Substances 0.000 description 8
- 238000003801 milling Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000003618 dip coating Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 244000241257 Cucumis melo Species 0.000 description 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D153/00—Coating compositions based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D153/02—Vinyl aromatic monomers and conjugated dienes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/20—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The application provides a room-temperature strong-oxidant-resistant strippable coating, a manufacturing method and a coating structure, wherein the room-temperature strong-oxidant-resistant strippable coating comprises the following components: SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: mixing the mass ratio of N to obtain first mixed raw rubber and second mixed raw rubber with different components; the first mixed raw rubber is prepared into first raw rubber through thin pass, sheet falling and back refining, and the first raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a first coating; the second mixed raw rubber is prepared into second raw rubber through thin pass, sheet falling and back mixing, and the second raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a second coating; the technical scheme of the application effectively solves the problems that the paint in the prior art needs to be cured by heating and has weak oxidation resistance.
Description
Technical Field
The application relates to the technical field of coatings, in particular to a strippable coating with strong room temperature oxidant resistance, a manufacturing method and a coating structure.
Background
The chemical milling process is to coat the surface of the metal part with strippable protecting paint, to form the etched part after the paint is cured, to eliminate the protecting paint in the required part and to etch in corresponding chemical milling corrosive liquid.
In the aerospace field, chemical milling technology is adopted for forming a plurality of large parts, such as a storage tank, a melon petal and a flap of a liquid rocket, a bracket and a panel of a satellite instrument and the like. The milling process plays an extremely important role in reducing the structural quality of the components, increasing the range and improving the carrying capacity.
The strippable protective coating mainly provides temporary anti-corrosion protection for the non-processed surface of the metal part in the chemical milling process. The coating has the advantages of high-temperature chemical corrosion resistance, better elastoplasticity, easy shape etching, good air tightness, proper etching ratio, ensured trimming linearity and the like, and in addition, the coating and the base material have proper combination between binding force and peelability in order to avoid the phenomenon of lifting glue during long-time chemical milling. Thus, the strippable protective coating is a critical material to ensure high quality formation of the chemically milled parts.
At present, natural rubber water-based strippable protective paint exists in China, but heating and curing are needed; there are also butyl rubber based acid and alkali resistant, generally strippable protective coatings. However, the corrosion of the acid liquid, the alkali liquid and the oxidation acid liquid are classified according to the types of the chemically milled metals, and the oxidation acid liquid corrosion is much more severe than the acid liquid and the alkali liquid corrosion in terms of the tolerance of the protective coating.
Disclosure of Invention
The application provides a strippable coating with strong room temperature oxidant resistance, a manufacturing method and a coating structure, which solve the problems that the coating in the prior art needs to be heated and solidified and has weak oxidation resistance.
According to the present application there is provided a room temperature strong oxidant resistant strippable coating comprising: SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: mixing the mass ratio of N to obtain first mixed raw rubber and second mixed raw rubber with different components; the first mixed raw rubber is prepared into first raw rubber through thin pass, sheet falling and back refining, and the first raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a first coating; the second mixed raw rubber is prepared into second raw rubber through thin pass, sheet falling and back mixing, and the second raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a second coating; the solid content of the first coating and the second coating is more than 30%, the viscosity is not less than 2000 mPa.S, the elongation at break is not less than 600% after the coating is cured at room temperature for 24 hours, the elongation at break is not more than 50% after the coating is soaked in acid solution or alkali solution, and the use temperature of the coating can reach 100 ℃ after the coating is cured at room temperature.
According to another aspect of the present application, there is also provided a method for producing a releasable coating resistant to a strong oxidizing agent at room temperature, comprising the steps of: s10, SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: mixing the N, namely mixing the first mixed raw rubber and the second mixed raw rubber with different components; s20, preparing first mixed raw rubber into first raw rubber through thin pass, lower piece and return refining, and preparing second mixed raw rubber into second raw rubber through thin pass, lower piece and return refining; s30 will first virgin rubber: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 into a first coating, dissolving and dispersing a second virgin rubber: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 into a second coating.
Further, the SBS resin is 1401 and 1201, the phenolic resin is 2401, and the filler is magnesium silicate; the auxiliary agent comprises an accelerator and a pigment.
Further, in S20, SBS resin: phenolic resin: magnesium silicate: and (3) an accelerator: the pigment is 100:10-20:75-100:1.5-2.0:0.1-0.5; mixing adopts an open mill mode, and sequentially adding according to the formula sequence; the left and right cutters are not less than 8 times during mixing.
Further, in S20, the roll gap during sheet thinning is M, the roll gap during sheet discharging is N, and the roll gap during return refining is P, the roll gap value should be set as follows: p > M > N, and P is generally not more than 2.5mm, N is generally not less than 0.5mm.
Further, in step S30, the first or second raw rubber is first mixed in a mixing kettle: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, adding a solvent and then adding an original film; after the film is dissolved, dispersing for not less than 32 hours, wherein the rotating speed is not less than 960r/min; after the dispersion is completed, adding an accelerator, and re-dispersing for not less than 4 hours; after the preparation is completed, filtering and discharging are carried out, and the solid content, the viscosity and the stretch-break elongation are tested; after being qualified, the recipe can be used.
Further, the solvent is toluene or tetrachloroethylene, and the auxiliary agent is an accelerator.
Further, in step S40, when the paint is used, the surface to be painted needs to be treated by blowing sand or polishing, removing oil by solvent, etc. to keep the surface clean.
Further, the thicknesses of the primer, the transition layer and the surface layer are controlled to be 0.08mm-0.15mm, each layer needs to be sprayed, dip-coated or brushed for multiple times to ensure the thickness of each layer, the air-curing time is about 20min between two adjacent operation intervals, the total thickness of three layers is about 0.24mm-0.45mm after the three layers are constructed, after the coating is completed, the three layers are placed at normal temperature for 24 hours, the subsequent operation is directly selected according to actual needs, or the subsequent operation is performed after the three layers are insulated for 2 hours at 100 ℃.
According to another aspect of the present application, there is provided a coating structure sequentially including a substrate, a primer layer, a transition layer, and a surface layer, the primer layer and the surface layer being sprayed with a first coating, the transition layer being sprayed with a second coating, the first coating being the first coating described above, and the second coating being the second coating described above.
By applying the technical scheme of the application, the preparation method comprises the following steps of: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: n is mixed, and then a series of tools of thin pass, sheet falling and back mixing are used for preparing a first coating and a second coating, and the first coating and the second coating are used for different coatings of the same coating protection structure, so that the performances of compactness, adhesiveness and the like can be effectively improved. The technical scheme of the application effectively solves the problems that the paint in the prior art needs to be cured by heating and has weak oxidation resistance.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 shows a schematic diagram of the coating structure of the present application;
FIG. 2 shows a schematic diagram of the test curve after the room temperature cure of FIG. 1;
FIG. 3 shows a schematic diagram of the test curve of FIG. 1 after being immersed in a strong oxidizer;
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.
Exemplary embodiments according to the present disclosure will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, thicknesses of layers and regions are exaggerated for clarity, and identical reference numerals are used to denote identical devices, and thus descriptions thereof will be omitted.
As shown in fig. 1 to 3, the room temperature strong oxidizer resistant releasable coating of the present application comprises: SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: and N is mixed to obtain first mixed raw rubber and second mixed raw rubber with different components. The first mixed raw rubber is prepared into first raw rubber through thin pass, sheet falling and back refining, and the first raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 to prepare a first coating. The second mixed raw rubber is prepared into second raw rubber through thin pass, sheet falling and back mixing, and the second raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 to prepare a second coating. The solid content of the first coating and the second coating is more than 30%, the viscosity is not less than 2000 mPa.S, the elongation at break is not less than 600% after the coating is cured at room temperature for 24 hours, the elongation at break is not more than 50% after the coating is soaked in acid solution or alkali solution, and the use temperature of the coating can reach 100 ℃ after the coating is cured at room temperature.
By applying the technical scheme of the application, the preparation method comprises the following steps of: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: n is mixed, and then a series of tools of thin pass, sheet falling and back mixing are used for preparing a first coating and a second coating, and the first coating and the second coating are used for different coatings of the same coating protection structure, so that the performances of compactness, adhesiveness and the like can be effectively improved. The technical scheme of the application effectively solves the problems that the paint in the prior art needs to be cured by heating and has weak oxidation resistance.
The application also provides a preparation method of the coating, which is a preparation method of the strippable coating with strong room temperature resistance and oxidant resistance, and is characterized by comprising the following steps:
s10, SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: mixing the N, namely mixing the first mixed raw rubber and the second mixed raw rubber with different components;
s20, preparing first mixed raw rubber into first raw rubber through thin pass, lower piece and return refining, and preparing second mixed raw rubber into second raw rubber through thin pass, lower piece and return refining;
s30 will first virgin rubber: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 into a first coating, dissolving and dispersing a second virgin rubber: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 into a second coating.
In the technical scheme of the application, the marks of SBS resin are 1401 and 1201, the mark of phenolic resin is 2401, and the filler is magnesium silicate; the auxiliary agent comprises an accelerator and a pigment. The materials are easy to obtain, and the prepared coating has good performance.
In the technical solution of the present application, in S20, SBS resin: phenolic resin: magnesium silicate: and (3) an accelerator: the pigment is 100:10-20:75-100:1.5-2.0:0.1-0.5; mixing adopts an open mill mode, and sequentially adding according to the formula sequence; the left and right cutters are not less than 8 times during mixing. The coating prepared by the processing steps has good performance and can meet the processing requirements of aerospace devices.
In the technical scheme of the application, in S20, the roll gap is M in the thin pass, N in the sheet feeding and P in the back pass, and the roll gap value is set as follows: p > M > N, and P is generally not more than 2.5mm, N is generally not less than 0.5mm. The roll gap value processing effect is good.
In the technical scheme of the application, in step S30, first, the first virgin rubber or the second virgin rubber is stirred in a stirred tank: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, adding a solvent and then adding an original film; after the film is dissolved, dispersing for not less than 32 hours, wherein the rotating speed is not less than 960r/min; after the dispersion is completed, adding an accelerator, and re-dispersing for not less than 4 hours; after the preparation is completed, filtering and discharging are carried out, and the solid content, the viscosity and the stretch-break elongation are tested; after being qualified, the recipe can be used. The coating processed by the processing steps has good effect.
In the technical scheme of the application, the solvent is toluene or tetrachloroethylene, and the auxiliary agent is an accelerator. Thus, the processing and manufacturing process is not interfered by other factors, such as bubbles and the like.
In the technical scheme of the application, in step S40, when the paint is used, the surface to be painted needs to be subjected to operations such as sand blowing or polishing treatment, solvent degreasing and the like so as to keep the surface clean. The coating effect is better, and the coating is not easy to fall off.
In the technical scheme of the application, the thicknesses of the primer, the transition layer and the surface layer are controlled to be 0.08-0.15 mm, each layer needs to be sprayed, dip-coated or brushed for multiple times to ensure the thickness of each layer, the air-curing time is about 20min between two adjacent operation intervals, the total thickness of three layers is about 0.24-0.45 mm, after the coating is completed, the three layers are placed at normal temperature for 24 hours, and then the subsequent operation is directly selected according to actual needs, or the subsequent operation is carried out after the heat preservation is carried out for 2 hours at 100 ℃. The coating has better anti-oxidation and anti-corrosion effects.
The application also provides a paint protection structure which sequentially comprises a base material, a bottom layer, a transition layer and a surface layer, wherein the bottom layer and the surface layer are sprayed by adopting first paint, the transition layer is sprayed by adopting second paint, the first paint is the first paint, and the second paint is the second paint. This allows for coating as desired, for example, dense coatings for the outermost layer, which effectively prevents corrosive media from corroding the substrate or oxidizing the substrate during processing.
In summary, a preparation and application method of the strippable protective coating with a plurality of layers of room-temperature cured strong oxidant resistance are known. The strippable protective coating with moderate binding force and strippability between the primer and the base material and oxidation resistance and room temperature curing is developed through the proportioning and mixing process research of the strippable protective coating; through design of protective layers with different functions and compatible technical research, a simple and practical construction process method is provided.
A preparation and application method of a multilayer room-temperature-cured strong-oxidant-resistant strippable protective coating is mainly realized by the following technical scheme.
1) A room temperature curing strong oxidant resistant strippable protective coating is characterized in that: the solid content of the coating is more than 30%; a viscosity of not less than 2000 mPa.S; after 24 hours of room temperature curing, the elongation at break is not less than 600%; after being soaked by acid liquor or alkali liquor, the elongation at break is reduced by not more than 50%; after the paint is solidified at normal temperature, the use temperature can reach 100 ℃.
2) A method for applying a multilayer peelable protective coating, characterized by: the thickness of each layer is controlled to be 0.08-0.15 mm; the construction process is simple, no complex equipment is needed, and the spray coating, dip coating and brush coating processes are adopted.
3) A preparation and application method of a multilayer room-temperature-cured strong-oxidant-resistant strippable protective coating comprises the following steps:
step S1, a preparation process of a multilayer room-temperature-cured strippable protective coating with strong oxidant resistance, which comprises the following raw materials of SBS resin, phenolic resin, filler and auxiliary agent.
Step S2, SBS resin: phenolic resin: and (3) filling: the auxiliary agent is 100:10-20:75-100: the mass ratio of N is mixed to obtain mixed raw rubber 1 and mixed raw rubber 2 with two components.
And S3, carrying out thin pass, sheet feeding and return refining on the mixed raw rubber 1 and 2 obtained in the step S2 to prepare raw rubber 1 and 2.
Step S4, preparing the virgin rubber sheet obtained in the step S3 into a strippable protective coating according to the virgin rubber sheet 1 or 2: solvent: the auxiliary agent is 100:200-230:2-5 mass ratio, and dissolving the virgin rubber and dispersing at high speed.
And S5, taking the paint prepared from the original film 1 as a primer and a finishing paint, taking the paint prepared from the original film 2 as a transition layer, coating the prepared paint on the surface to be coated through spray coating, dip coating or brush coating, controlling the open time and each layer thickness, and then selecting a mode of curing for more than 24 hours at room temperature or heating and curing according to actual use conditions, wherein the curing is finished, and then the subsequent operation can be carried out.
Furthermore, the SBS marks 1401 and 1201 in the step S1 have the advantages of good tensile strength, elasticity, air permeability, temperature resistance and good mixing property; the phenolic resin is 2401; the filler is magnesium silicate; the auxiliary agent comprises an accelerator and a pigment.
Further, the mass ratio of the auxiliary agent in the step S2 comprises: SBS resin (1401, 1201): phenolic resin: magnesium silicate: the accelerator and pigment are 100:10-20:75-100:1.5 to 2.0:0.1 to 0.5; mixing adopts an open mill mode, and sequentially adding according to the formula sequence; the left and right cutters are not less than 8 times during mixing.
Further, in step S3, the roll gap during sheet thinning is M, the roll gap during sheet feeding is N, and the roll gap during back-refining is P, the roll gap value should be set as follows: p > M > N, and P is generally not more than 2.5mm, N is generally not less than 0.5mm.
Further, in the step S4, the solvent is toluene or tetrachloroethylene, and the auxiliary agent is an accelerator. Firstly, the raw rubber sheet 1 or 2 is put into a stirring kettle: solvent: the auxiliary agent is 100:200-230: adding a solvent in a mass ratio of 2-5, and then adding an original film; after the film is dissolved, high-speed dispersion is carried out, the dispersion time is not less than 32 hours, and the rotating speed is not less than 960r/min; after the dispersion is completed, adding an accelerator, and re-dispersing for not less than 4 hours. After the preparation is completed, filtering and discharging are carried out, and performances such as solid content, viscosity, elongation at break and the like are tested. After being qualified, the recipe can be used.
Further, in step S5, when the paint is used, the surface to be painted needs to be treated by blowing sand or polishing, removing oil with a solvent, and the like, so as to keep the surface clean. The thickness of the priming paint, the transition layer and the surface layer is controlled to be 0.08-0.15 mm. Generally, each layer needs to be sprayed, dipped or brushed twice to ensure the thickness of each layer, the open time of the two operation intervals is about 20min, and the total thickness of three layers after construction is about 0.24-0.45 mm. After the coating is finished, the coating is placed for 24 hours at normal temperature, and then the subsequent operation is directly carried out according to actual needs, or the subsequent operation is carried out after heat preservation for 2 hours at the temperature of 100 ℃.
The solid content of the strippable protective coating prepared by the application is not less than 30% according to GB1725-2007 test; viscosity according to GB2794-2013, the viscosity is not less than 2000 mPa.S or not less than 300S; the tensile elongation at break is tested according to GB528-2009, and after the adhesive is cured for 24 hours at room temperature, the tensile elongation at break is not less than 600%; after being soaked by acid liquor or alkali liquor, the elongation at break is reduced by not more than 50 percent.
The strippable protective coating reported at present is water-based natural rubber, a workpiece needs to be heated during coating, and after the surface is dried, the workpiece still needs to be heated and solidified to achieve ideal performance, and the operation is relatively complicated for the workpiece with larger size. The strippable protective coating prepared by the application can realize room temperature solidification, and the three-layer structural design also gives consideration to the balance of the binding force and strippable property between the base material and the coating, and simultaneously ensures the compactness and hardness of the coating, so that the coating has good milling straightness, acid resistance, alkali resistance, strong oxidant resistance and other properties. Can be widely applied to chemical milling protection of workpieces such as aluminum alloy, titanium alloy, stainless steel and the like.
Advantageous effects
The application develops the strippable protective coating which has moderate binding force and strippable property between the primer and the base material, is oxidation resistant and is cured at room temperature through developing the proportioning and mixing process research of the strippable protective coating. The coating has simple preparation process, is safe and easy to operate, and is easy to realize mass production; the research result can be widely applied to the fields of aerospace, machining, electronic industry, electroplating, anodic oxidation treatment and the like, and the construction process is simple and practical, so that the production efficiency is greatly improved.
The specific embodiment is as follows:
the preparation of the room temperature curable strong oxidant resistant peelable protective coating provided by the application and the strong oxidant resistant performance are described in detail by example 1.
Example 1 a room temperature curable strong oxidant resistant strippable protective coating was prepared comprising the steps of:
step S1, preparing a room-temperature-cured strong-oxidant-resistant strippable protective coating by a process, wherein the raw materials comprise SBS resin, phenolic resin, filler and auxiliary agent.
Step S2, SBS resin: phenolic resin: and (3) filling: the auxiliary agent is 100:10-20:75-100: the mass ratio of N was kneaded to obtain two-component mixed gums 1 and 2 (first mixed gum and second mixed gum).
And S3, carrying out thin pass, sheet falling and back refining on the mixed raw rubber 1 and 2 obtained in the step S2 to obtain raw rubber sheets 1 and 2 (first raw rubber and second raw rubber).
Step S4, preparing the virgin rubber sheet obtained in the step S3 into a strippable protective coating according to the virgin rubber sheet 1 or 2: solvent: the auxiliary agent is 100:200-230:2-5 by mass ratio, and dissolving the virgin rubber and dispersing at high speed.
Furthermore, the SBS marks 1401 and 1201 in the step S1 have the advantages of good tensile strength, elasticity, air permeability, temperature resistance and good mixing property; the phenolic resin is 2401; the filler is magnesium silicate; the auxiliary agent comprises an accelerator and a pigment.
Further, the mass ratio of the auxiliary agent in the step S2 comprises: SBS resin (1401, 1201): phenolic resin: magnesium silicate: the accelerator and pigment are 100:10-20:75-100:1.5-2.0:0.1-0.5; mixing adopts an open mill mode, and sequentially adding according to the formula sequence; the left and right cutters are not less than 8 times during mixing.
Further, in step S3, the roll gap during sheet thinning is M, the roll gap during sheet feeding is N, and the roll gap during back-refining is P, the roll gap value should be set as follows: p > M > N, and P is generally not more than 2.5mm, N is generally not less than 0.5mm.
Further, in the step S4, the solvent is toluene or tetrachloroethylene, and the auxiliary agent is an accelerator. Firstly, the raw rubber sheet 1 or 2 is put into a stirring kettle: solvent: the auxiliary agent is 100:200-230:2-5, adding a solvent and then adding an original film; after the film is dissolved, high-speed dispersion is carried out, the dispersion time is not less than 32 hours, and the rotating speed is not less than 960r/min; after the dispersion is completed, adding an accelerator, and re-dispersing for not less than 4 hours. After the preparation is completed, filtering and discharging are carried out, and performances such as solid content, viscosity, elongation at break and the like are tested. After being qualified, the recipe can be used.
The strippable protective coating with strong oxidant resistance prepared in example 1 has elongation at break of not less than 600% after 24h of room temperature curing; after being soaked by strong oxidant, the elongation at break is reduced by not more than 50 percent. Testing according to GB528-2009, and meeting the requirements; the peelability is good after being soaked for 15min by a strong oxidant. The elongation at break test curve is shown in figure 2.
The preparation and application method of the multilayer room temperature curing strong oxidant resistant strippable protective coating provided by the application are described in detail by an example 2.
Example 2 a method of preparing and applying a multilayer room temperature curable strong oxidant resistant strippable protective coating comprising the steps of.
Step S1, a preparation process of a multilayer room-temperature-cured strippable protective coating with strong oxidant resistance, which comprises the following raw materials of SBS resin, phenolic resin, filler and auxiliary agent.
Step S2, SBS resin: phenolic resin: and (3) filling: the auxiliary agent is 100:10-20:75-100: the mass ratio of N is mixed to obtain mixed raw rubber 1 and mixed raw rubber 2 with two components.
And S3, carrying out thin pass, sheet feeding and return refining on the mixed raw rubber 1 and 2 obtained in the step S2 to prepare raw rubber 1 and 2.
Step S4, preparing the virgin rubber sheet obtained in the step S3 into a strippable protective coating according to the virgin rubber sheet 1 or 2: solvent: the auxiliary agent is 100:200-230:2-5 by mass ratio, and dissolving the virgin rubber and dispersing at high speed.
And S5, taking the paint prepared from the original film 1 as a primer and a finishing paint, taking the paint prepared from the original film 2 as a transition layer, coating the prepared paint on the surface to be coated through spray coating, dip coating or brush coating, controlling the open time and each layer thickness, and then selecting a mode of curing for more than 24 hours at room temperature or heating and curing according to actual use conditions, wherein the curing is finished, and then the subsequent operation can be carried out.
Furthermore, the SBS marks 1401 and 1201 in the step S1 have the advantages of good tensile strength, elasticity, air permeability, temperature resistance and good mixing property; the phenolic resin is 2401; the filler is magnesium silicate; the auxiliary agent comprises an accelerator and a pigment.
Further, the mass ratio of the auxiliary agent in the step S2 comprises: SBS resin (1401, 1201): phenolic resin: magnesium silicate: the accelerator and pigment are 100:10-20:75-100:1.5-2.0:0.1-0.5; mixing adopts an open mill mode, and sequentially adding according to the formula sequence; the left and right cutters are not less than 8 times during mixing.
Further, in step S3, the roll gap during sheet thinning is M, the roll gap during sheet feeding is N, and the roll gap during back-refining is P, the roll gap value should be set as follows: p > M > N, and P is generally not more than 2.5mm, N is generally not less than 0.5mm.
Further, in the step S4, the solvent is toluene or tetrachloroethylene, and the auxiliary agent is an accelerator. Firstly, the raw rubber sheet 1 or 2 is put into a stirring kettle: solvent: the auxiliary agent is 100:200-230:2-5, adding a solvent and then adding an original film; after the film is dissolved, high-speed dispersion is carried out, the dispersion time is not less than 32 hours, and the rotating speed is not less than 960r/min; after the dispersion is completed, adding an accelerator, and re-dispersing for not less than 4 hours. After the preparation is completed, filtering and discharging are carried out, and performances such as solid content, viscosity, elongation at break and the like are tested. After being qualified, the recipe can be used.
Further, in step S5, when the paint is used, the surface to be painted needs to be treated by blowing sand or polishing, removing oil with a solvent, and the like, so as to keep the surface clean. The thickness of the priming paint, the transition layer and the surface layer is controlled to be 0.08-0.15 mm. Generally, each layer needs to be sprayed, dipped or brushed twice to ensure the thickness of each layer, the open time of the two operation intervals is about 20min, and the total thickness of three layers after construction is about 0.24-0.45 mm. After the coating is finished, the coating is placed for 24 hours at normal temperature, and then the subsequent operation is directly carried out according to actual needs, or the subsequent operation is carried out after heat preservation for 2 hours at the temperature of 100 ℃.
The process for applying the multilayer room temperature curable strong oxidant resistant strippable protective coating provided in example 2 has the following characteristics: 1) The construction process is simple and convenient, and can be realized by adopting a plurality of process methods such as brushing, spraying, dipping and the like; 2) The bonding force between the primer and the base material and the peelability are balanced, so that good peelability is ensured, and the phenomenon of lifting glue or debonding in the using process is prevented; 3) The time interval between each spraying or brushing is shorter, about 20 minutes, the operation can be continued, and the working procedure time is saved.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be capable of being practiced otherwise than as specifically illustrated and described. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A room temperature strong oxidizer resistant strippable coating comprising:
SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: mixing the N to obtain first mixed raw rubber and second mixed raw rubber with different components;
the first mixed raw rubber is prepared into first raw rubber through thin pass, sheet falling and back refining, and the first raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a first coating;
the second mixed raw rubber is prepared into second raw rubber through thin pass, sheet falling and back refining, and the second raw rubber is prepared by the following steps: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, preparing a second coating;
the solid content of the first coating and the second coating is more than 30%, the viscosity is not less than 2000mPaS, the elongation at break is not less than 600% after the coating is cured at room temperature for 24 hours, the elongation at break is not more than 50% after the coating is soaked in acid solution or alkali solution, and the use temperature of the coating can reach 100 ℃ after the coating is cured at room temperature.
2. The preparation method of the room-temperature strong-oxidant-resistant strippable coating is characterized by comprising the following steps of:
s10, SBS resin: phenolic resin: and (3) filling: the mass ratio of the auxiliary agent is 100:10-20:75-100: mixing the N, namely mixing the first mixed raw rubber and the second mixed raw rubber with different components;
s20, the first mixed raw rubber is processed into first raw rubber through thin pass, lower piece and back refining, and the second mixed raw rubber is processed into second raw rubber through thin pass, lower piece and back refining;
s30 adding the first virgin rubber: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 into a first coating, dissolving and dispersing the second virgin rubber: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5 into a second coating.
3. The method for preparing the room temperature strong oxidizer resistant strippable coating according to claim 2, wherein the SBS resin is of the grades 1401 and 1201, the phenolic resin is of the grade 2401, and the filler is magnesium silicate; the auxiliary agent comprises an accelerator and a pigment.
4. The method for producing a room temperature strong oxidizer resistant peelable coating according to claim 3, wherein in S20, the SBS resin: phenolic resin: magnesium silicate: and (3) an accelerator: the pigment is 100:10-20:75-100:1.5-2.0:0.1-0.5; mixing adopts an open mill mode, and sequentially adding according to the formula sequence; the left and right cutters are not less than 8 times during mixing.
5. The method of producing a room temperature strong oxidizer resistant peelable coating according to claim 4, wherein in S20, the thin pass roll gap is M, the bottom sheet roll gap is N, and the return roll gap is P, and the roll gap value is set to be: p > M > N, and P is generally not more than 2.5mm, N is generally not less than 0.5mm.
6. The method for preparing the room temperature strong oxidizer resistant strippable coating according to claim 5, wherein in step S30, the first virgin rubber or the second virgin rubber is first stirred in a stirred tank: solvent: the mass ratio of the auxiliary agent is 100:200-230:2-5, adding a solvent and then adding an original film; after the film is dissolved, dispersing for not less than 32 hours, wherein the rotating speed is not less than 960r/min; after the dispersion is completed, adding an accelerator, and re-dispersing for not less than 4 hours; after the preparation is completed, filtering and discharging are carried out, and the solid content, the viscosity and the stretch-break elongation are tested; after being qualified, the recipe can be used.
7. The method for producing a room temperature strongly oxidizing agent resistant releasable coating according to claim 6, wherein the solvent is toluene or tetrachloroethylene and the auxiliary agent is an accelerator.
8. The method for preparing a room temperature strong oxidizer resistant peelable coating according to claim 6, wherein in the step S40, the surface to be coated is subjected to operations such as sand blowing or polishing treatment, solvent degreasing, etc. to keep the surface clean when the coating is used.
9. The method for preparing the room-temperature strong oxidant resistant strippable coating according to claim 8, wherein the thicknesses of the primer, the transition layer and the surface layer are controlled to be 0.08-0.15 mm, each layer is required to be sprayed, dip-coated or brushed for multiple times to ensure the thickness of each layer, the open time of two adjacent operation intervals is about 20min, the total thickness of three layers after construction is about 0.24-0.45 mm, after the coating is finished, the three layers are placed at normal temperature for 24h, the subsequent operation is directly selected according to actual needs, or the subsequent operation is carried out after heat preservation for 2h at 100 ℃.
10. The coating protection structure is characterized by sequentially comprising a base material, a bottom layer, a transition layer and a surface layer, wherein the bottom layer and the surface layer are sprayed by adopting first coating, the transition layer is sprayed by adopting second coating, the first coating is the first coating of claim 1, and the second coating is the second coating of claim 1.
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