CN116004075A - Solvent type chemical milling protective coating and preparation method thereof - Google Patents
Solvent type chemical milling protective coating and preparation method thereof Download PDFInfo
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- CN116004075A CN116004075A CN202310052263.6A CN202310052263A CN116004075A CN 116004075 A CN116004075 A CN 116004075A CN 202310052263 A CN202310052263 A CN 202310052263A CN 116004075 A CN116004075 A CN 116004075A
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Abstract
The invention discloses a solvent type chemical milling protective coating and a preparation method thereof, belongs to the technical field of chemical milling protective coatings, and particularly relates to a solvent type chemical milling protective coating and a preparation method thereof. The invention takes an SEBS thermoplastic elastomer as a substrate, introduces reinforcing resin with specific composition to modify the SEBS thermoplastic elastomer, and adds filler and solvent to prepare the SEBS thermoplastic elastomer. The solvent-based chemical milling protective coating disclosed by the invention has proper peeling strength, no sizing material residue is left on the surface of a peeled base material, the subsequent base material treatment process of the chemical milling protective coating is omitted, and the solvent-based chemical milling protective coating has the characteristics of long-acting acid-base resistance, flatness, small erosion ratio, good leveling property and no leakage. The chemical milling protective coating disclosed by the invention is safe and environment-friendly in formula, easy to obtain raw materials, simple and convenient in preparation method, simple to operate, easy to control and convenient to popularize and apply.
Description
Technical Field
The invention belongs to the technical field of chemical milling protective paint, and particularly relates to solvent type chemical milling protective paint and a preparation method thereof.
Background
The chemical milling protective coating (called milling glue for short) is a coating which is coated and solidified on the surface of a workpiece to be processed before chemical milling processing, and is removed from the surface of a material after the chemical milling process is finished, so as to protect the part of the workpiece which does not need to be processed.
Depending on the dispersion medium, chemical milling protective coatings can be classified into solvent-based chemical milling protective coatings and aqueous chemical milling protective coatings. The chemical milling protective coating has different physical and chemical properties due to different types and proportions of resin, functional additive, pigment and filler and solvent. Compared with the water-based chemical milling protective coating, the solvent-based chemical milling protective coating has the advantages of excellent leveling property, higher curing speed, smoothness of an obtained paint film, simple preparation process and the like, and can avoid air holes and bulges generated by overflow of internal water vapor when the coating is surface-dried. Due to the advantages, the solvent type chemical milling protective coating is an ideal material for protecting the surface of a product in chemical milling processing. The solvent-based chemical milling protective coating has wide application in the fields of civil industry, aviation, aerospace, aircraft manufacturing and the like, so that the requirements of the solvent-based chemical milling protective coating are increasingly expanding.
However, in the prior art, the erosion ratio range of a coating formed by chemical milling protective paint is wider, the peeling strength is unsuitable, the residual sizing material exists after peeling, the residual sizing material on the surface is required to be removed by subsequent treatment, and the chemical milling effect and the engraving effect are required to be further improved; in addition, aromatic organic solvents are generally adopted, so that the toxicity is high.
In view of the above, it is significant to develop an environment-friendly chemical milling protective coating which is easy to peel and has no chemical residues.
Disclosure of Invention
Therefore, the technical problems to be solved by the invention are to overcome the defects of wide erosion ratio range, uneven etching, unsuitable peeling strength, chemical residue on a substrate after peeling, chemical milling effect, to-be-improved etching effect, high toxicity of aromatic solvents and the like of the chemical milling protective coating in the prior art, thereby providing the solvent type chemical milling protective coating with suitable peeling strength and no residue and the preparation method thereof.
Therefore, the invention provides the following technical scheme:
the invention provides a solvent type chemical milling protective coating, which comprises the following components in percentage by mass:
the reinforcing resin is prepared from the following components in percentage by mass (3-10): (0.6-3): (10-30), a mixed solution of a tackifying resin, polystyrene and a second solvent.
The tackifying resin is at least one of phenolic resin, hydrogenated petroleum resin and poly alpha-methyl styrene resin;
optionally, the hydrogenated petroleum resin is at least one of a C5 hydrogenated petroleum resin and a C9 hydrogenated petroleum resin.
The SEBS thermoplastic elastomer is at least one of linear SEBS thermoplastic elastomer and star-shaped SEBS thermoplastic elastomer;
the filler is at least one of talcum powder, kaolin, nano calcium carbonate, silica and fumed silica, wherein the mass ratio of the talcum powder to the silica to the fumed silica is (8.2-15.5): (0.2-1.1): (0.25-1.0).
And/or the first solvent is at least one of tetrachloroethylene, trichloromethane, ethyl acetate, methyl isobutyl ketone and 2-butanone;
and/or the second solvent is at least one of tetrachloroethylene, trichloromethane, ethyl acetate, methyl isobutyl ketone and 2-butanone;
and/or the first solvent is the same as the second solvent.
Optionally, the dissolution temperature of the reinforced resin is 10-50 ℃ and the dissolution time is 2-12h.
The invention also provides a preparation method of the solvent type chemical milling protective coating, which comprises the following steps:
s1, dissolving an SEBS thermoplastic elastomer into a first solvent, adding reinforcing resin, and stirring;
s2, adding filler, mixing and grinding to obtain the solvent type chemical milling protective coating.
Optionally, in step S1, the stirring time is 0.5-3h.
Optionally, in step S2, grinding is performed to a fineness of 40 μm or less.
Optionally, in step S2, the mixing time is 30-90min, and the grinding time is 1-30min.
Preferably, the solvent type chemical milling protective coating provided by the invention comprises the following components in percentage by mass:
preferably, the reinforcing resin consists of the following components in percentage by mass (3-10): (0.6-3): the tackifying resin of (10-30), polystyrene and a second solvent, wherein the tackifying resin is at least one of phenolic resin, C5 hydrogenated petroleum resin, C9 hydrogenated petroleum resin and poly alpha-methyl styrene resin;
the preparation method of the reinforced resin comprises the steps of preparing materials according to the formula, adding the tackifying resin and the second solvent into a reaction container, stirring at a high speed (the rotating speed is 800-1500 r/min) until the tackifying resin and the second solvent are completely dissolved, adding polystyrene, heating to 10-50 ℃ and stirring for 2-12h to obtain the reinforced resin.
The preparation method of the solvent type chemical milling protective coating comprises the following steps of: dissolving the SEBS thermoplastic elastomer by using a first solvent under the condition of stirring at a high speed (the rotating speed is 800-1500 r/min), adding the reinforcing resin into the mixture, continuously stirring for 0.5-3h, then sequentially adding talcum powder, silica and fumed silica, fully stirring (stirring at a low speed, and stirring at a rotating speed of 200-700 r/min) until the talcum powder, the silica and the fumed silica are fully mixed, grinding the mixture by using a sand mill until the fineness is less than or equal to 40 mu m, and discharging the mixture to obtain the solvent type chemical milling protective coating easy to strip.
The technology has the beneficial effects that:
(1) The solvent type chemical milling protective coating provided by the invention selects the SEBS thermoplastic elastomer with excellent ageing resistance, heat resistance and chemical resistance as a main film forming substance, and improves the corrosion resistance of the coating by using the reinforced resin with specific composition, so that the coating has good acid and alkali resistance and corrosion resistance at high temperature, small corrosion ratio, smooth etching and compact adhesive film. Meanwhile, the reinforced resin with specific composition is introduced to overcome the defects that the adhesive film is not easy to peel off in a large area and has poor protective effect when only the SEBS thermoplastic elastomer is used, the cohesive force of the chemical milling protective coating is enhanced, the chemical milling protective coating has proper peeling strength, and the substrate material has the effects of smooth surface and no sizing residue after the coating is peeled off.
(2) According to the solvent type chemical milling protective coating provided by the invention, various performances of the chemical milling protective coating can be further improved through limiting the filler, specifically, the hardness of the chemical milling protective coating is improved by using filler talcum powder, the smoothness of a glue film after drying is improved, and the shrinkage stress of the chemical milling protective coating in the high-temperature chemical milling process is eliminated; the use of silica and fumed silica improves the anti-sedimentation performance of the chemical milling protective coating, and simultaneously enhances the hardness and impact resistance of the dried coating adhesive film.
(3) The solvent type chemical milling protective coating provided by the invention is safe and environment-friendly by limiting the first solvent and the second solvent, does not contain chemical substances harmful to the environment and human body such as benzene, dimethylbenzene and the like, and has the advantages of small smell, safety and reliability.
(4) The preparation method of the solvent type chemical milling protective coating provided by the invention has the advantages of simple operation of each step, easiness in control and convenience in popularization and application.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
The solvent-based chemical milling protective coating easy to peel off and the preparation method thereof are described below with reference to specific examples.
Example 1
The embodiment provides a solvent type chemical milling protective coating, which comprises the following components in parts by weight:
(1) Preparation of reinforcing resin: 35g of C5 hydrogenated petroleum resin (T100 brand of Shandong Changshou Co.) and 220g of tetrachloroethylene are respectively added into a three-neck flask with a stirring and thermometer, and the mixture is mechanically stirred at a high speed for 2 hours (the rotating speed is 900 r/min) until the mixture is completely dissolved; 6g of polystyrene (PS for short) is added into the three-neck flask (model PG-33 of Zhenjiang Qimei Co., ltd.) and is placed in a water bath kettle at 50 ℃ and mechanically stirred for 2 hours (the rotating speed is 900 r/min), and the reinforced resin is obtained after cooling and discharging.
(2) Preparing solvent type chemical milling protective paint: 330g of tetrachloroethylene was added to a 1000mL beaker and stirred mechanically (at 900 r/min); slowly adding 10g of linear SEBS thermoplastic elastomer (Yueyang petrochemical company, model 501T) into a beaker, and stirring at a high speed (the rotating speed is 900 r/min) until the thermoplastic elastomer is completely dissolved; repeating the above process, adding 60g of linear SEBS thermoplastic elastomer in total, and stirring at high speed until the thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); adding all the reinforcing resin obtained in the step (1), stirring at normal temperature and low speed for 0.5h (the rotating speed is 600 r/min), and then stirring at high speed (the rotating speed is 1000 r/min) for 1.5h; sequentially adding 90g of talcum powder, 8g of silica and 2g of fumed silica into a beaker, slowly adding the talcum powder, the 8g of silica and the 2g of fumed silica in batches, sealing the beaker by using a preservative film, stirring at a low speed for 60min (the rotating speed is 600 r/min) until the talcum powder, the 8g of silica and the 2g of fumed silica are uniformly mixed, stopping stirring, and cooling; transferring the cooled paint to a sand mill, and sanding for 10min until the fineness is lower than 40 mu m to obtain the solvent type chemical milling protective paint.
Example 2
The embodiment provides a solvent type chemical milling protective coating, which comprises the following components in parts by weight:
(1) Preparation of reinforcing resin: 25g of C9 hydrogenated petroleum resin (model T120 of Shandong Changshou Co., ltd.) and 220g of tetrachloroethylene are respectively added into a three-neck flask with a stirrer and a thermometer, and the mixture is mechanically stirred at a high speed for 2 hours (the rotating speed is 900 r/min) until the mixture is completely dissolved; 6g of PS is added into the three-neck flask, the mixture is placed in a water bath kettle at 50 ℃ and mechanically stirred for 2h (the rotating speed is 900 r/min) to cool, and the reinforced resin is obtained after discharging.
(2) Preparing solvent type chemical milling protective paint: 330g of tetrachloroethylene was added to a 1000mL beaker and stirred mechanically (at 900 r/min); slowly adding 10g of linear SEBS thermoplastic elastomer into a beaker, and stirring at a high speed until the linear SEBS thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); repeating the above process, adding 60g of linear SEBS thermoplastic elastomer in total, and stirring at high speed (the rotating speed is 900 r/min) until the thermoplastic elastomer is completely dissolved; adding all the reinforcing resin obtained in the step (1), stirring at normal temperature for 0.5h (the rotating speed is 600 r/min), and stirring at high speed (the rotating speed is 1000 r/min) for 2h; sequentially adding 90g of talcum powder, 8g of silica and 2g of fumed silica into a beaker, slowly adding the talcum powder, the 8g of silica and the 2g of fumed silica in batches, sealing the beaker by using a preservative film, stirring at a low speed for 60min (the rotating speed is 600 r/min) until the talcum powder, the 8g of silica and the 2g of fumed silica are uniformly mixed, stopping stirring, and cooling; transferring the cooled paint to a sand mill, and sanding for 10min until the fineness is lower than 40 mu m to obtain the solvent type chemical milling protective paint.
Example 3
The embodiment provides a solvent type chemical milling protective coating, which comprises the following components in parts by weight:
(1) Preparation of reinforcing resin: 25g of C5 hydrogenated petroleum resin and 220g of tetrachloroethylene are respectively added into a three-neck flask with a stirrer and a thermometer, and the mixture is mechanically stirred at a high speed for 2 hours (the rotating speed is 900 r/min) until the mixture is completely dissolved; 6g of PS is added into the three-neck flask, the mixture is placed in a water bath kettle at 50 ℃ and mechanically stirred for 2h (the rotating speed is 900 r/min) to cool, and the reinforced resin is obtained after discharging.
(2) Preparing solvent type chemical milling protective paint: 310g of tetrachloroethylene and 20g of chloroform are added into a 1000mL beaker and stirred mechanically (the rotating speed is 900 r/min); slowly adding 10g of linear SEBS thermoplastic elastomer into a beaker, and stirring at a high speed until the linear SEBS thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); repeating the above process, adding 40g of linear SEBS thermoplastic elastomer in total, and stirring at high speed until the thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); adding all the reinforcing resin obtained in the step (1), stirring at normal temperature for 1h (the rotating speed is 600 r/min), and stirring at high speed (the rotating speed is 1000 r/min) for 1h; sequentially adding 112g of talcum powder, 2g of silica and 6g of fumed silica into a beaker, slowly adding the talcum powder, the 2g of silica and the 6g of fumed silica in batches, sealing the beaker by using a preservative film, stirring at a low speed for 90min (the rotating speed is 600 r/min), stopping stirring until the talcum powder, the 2g of silica and the 6g of fumed silica are uniformly mixed, and cooling; transferring the cooled paint to a sand mill, and sanding for 20min until the fineness is lower than 40 mu m to obtain the solvent chemical milling protective paint.
Example 4
The embodiment provides a solvent type chemical milling protective coating, which comprises the following components in parts by weight:
(1) Preparation of reinforcing resin: 55g of C9 hydrogenated petroleum resin and 120g of tetrachloroethylene are respectively added into a three-neck flask with a stirrer and a thermometer, and the mixture is mechanically stirred at a high speed for 2 hours (the rotating speed is 900 r/min) until the mixture is completely dissolved; adding 10gPS to the three-neck flask, placing in a water bath kettle at 50 ℃, mechanically stirring for 10h (the rotating speed is 900 r/min), cooling, and discharging to obtain the reinforced resin.
(2) Preparing solvent type chemical milling protective paint: 280g of tetrachloroethylene are added into a 1000mL beaker and stirred mechanically (the rotating speed is 900 r/min); slowly adding 10g of linear SEBS thermoplastic elastomer into a beaker, and stirring at a high speed until the linear SEBS thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); repeating the above process, adding 70g of linear SEBS thermoplastic elastomer in total, and stirring at high speed until the thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); adding all the reinforcing resin obtained in the step (1), stirring at normal temperature for 1h (the rotating speed is 600 r/min), and stirring at high speed (the rotating speed is 1000 r/min) for 1h; sequentially adding 50g of talcum powder, 6g of silica and 3g of fumed silica into a beaker, slowly adding the talcum powder, the 6g of silica and the 3g of fumed silica in batches, sealing the beaker by using a preservative film, stirring at a low speed for 60min (the rotating speed is 600 r/min), stopping stirring until the talcum powder, the 6g of silica and the 3g of fumed silica are uniformly mixed, and cooling; transferring the cooled paint to a sand mill, and sanding for 10min until the fineness is lower than 40 mu m to obtain the solvent chemical milling protective paint.
Example 5
The embodiment provides a solvent type chemical milling protective coating, which comprises the following components in parts by weight:
(1) Preparation of reinforcing resin: 25g of C5 hydrogenated petroleum resin and 220g of tetrachloroethylene are respectively added into a three-neck flask with a stirrer and a thermometer, and the mixture is mechanically stirred at a high speed for 2 hours (the rotating speed is 900 r/min) until the mixture is completely dissolved; 6g of PS is added into the three-neck flask, the mixture is placed in a water bath kettle at 50 ℃ and mechanically stirred for 2h (the rotating speed is 900 r/min) to cool, and the reinforced resin is obtained after discharging.
(2) Preparing solvent type chemical milling protective paint: 330g of tetrachloroethylene was added to a 1000ml beaker and stirred mechanically (at 900 r/min); slowly adding 10G of star-shaped SEBS thermoplastic elastomer (Koteng Co., ltd.; model G1726) into a beaker, and stirring at a high speed until the thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); repeating the above process, adding 70g of star-shaped SEBS thermoplastic elastomer in total, and stirring at high speed until the thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); adding all the reinforcing resin obtained in the step (1), stirring at normal temperature for 0.5h (the rotating speed is 600 r/min), and stirring at high speed (the rotating speed is 1000 r/min) for 1.5h; sequentially adding 90g of talcum powder, 6g of silica, 2g of kaolin and 2g of fumed silica into a beaker, slowly adding the talcum powder, the 6g of silica, the 2g of kaolin and the 2g of fumed silica into the beaker in batches, sealing the beaker by using a preservative film, stirring the materials at a low speed for 60min (the rotating speed is 600 r/min), stopping stirring until the materials are uniformly mixed, and cooling; transferring the cooled paint to a sand mill, and sanding for 10min until the fineness is lower than 40 mu m to obtain the solvent chemical milling protective paint.
Example 6
This example provides a solvent-based chemical milling protective coating, which differs from example 1 in that 40g of phenolic resin (softening point 85-120 ℃ C. From Henan Saint Co., ltd.) was used instead of 35g of C5 hydrogenated petroleum resin.
Example 7
The present example provides a solvent-based chemical milling protective coating, which is different from example 1 in that a poly-alpha-methylstyrene resin (model CY-A6, shandong blaze company) is used instead of a C5 hydrogenated petroleum resin.
Comparative example 1
The comparative example provides a solvent type chemical milling protective coating, which comprises the following components in parts by weight:
preparing solvent type chemical milling protective paint: 330g of tetrachloroethylene was added to a 1000ml beaker and stirred mechanically (at 900 r/min); slowly adding 10g of linear SEBS thermoplastic elastomer into a beaker, and stirring at a high speed until the linear SEBS thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); repeating the above process, adding 60g of linear SEBS thermoplastic elastomer in total, and stirring at high speed until the thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); sequentially adding 90g of talcum powder, 8g of silica and 2g of fumed silica into a beaker, slowly adding the talcum powder, the 8g of silica and the 2g of fumed silica in batches, sealing the beaker by using a preservative film, stirring at a low speed for 60min (the rotating speed is 600 r/min), stopping stirring until the talcum powder, the 8g of silica and the 2g of fumed silica are uniformly mixed, and cooling; transferring the cooled paint to a sand mill, and sanding for 10min until the fineness is lower than 40 mu m to obtain the solvent chemical milling protective paint.
Comparative example 2
The comparative example provides a solvent type chemical milling protective coating, which comprises the following components in parts by weight:
(1) Preparation of reinforcing resin: 20g of C5 hydrogenated petroleum resin and 240g of tetrachloroethylene are respectively added into a three-neck flask with a stirrer and a thermometer, and the mixture is mechanically stirred at a high speed for 2 hours (the rotating speed is 900 r/min) until the mixture is completely dissolved; adding 3gPS into the three-neck flask, placing in a water bath kettle at 50 ℃, mechanically stirring for 2h (the rotating speed is 900 r/min), cooling, and discharging to obtain the reinforced resin.
(2) Preparing solvent type chemical milling protective paint: 290g of tetrachloroethylene is added into a 1000ml beaker and stirred mechanically (the rotating speed is 900 r/min); slowly adding 10g (5 g added last time) of linear SEBS thermoplastic elastomer into a beaker, and stirring at a high speed until the linear SEBS thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); repeating the above process, adding 35g of linear SEBS thermoplastic elastomer in total, and stirring at high speed until the thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); adding all the reinforcing resin obtained in the step (1), stirring at normal temperature for 0.5h (the rotating speed is 600 r/min), and stirring at high speed (the rotating speed is 1000 r/min) for 1.5h; sequentially adding 130g of talcum powder, 10g of silica and 1g of fumed silica into a beaker, slowly adding the talcum powder, the 10g of silica and the 1g of fumed silica in batches, sealing the beaker by using a preservative film, stirring at a low speed for 60min (the rotating speed is 600 r/min), stopping stirring until the talcum powder, the 10g of silica and the 1g of fumed silica are uniformly mixed, and cooling; transferring the cooled paint to a sand mill, and sanding for 10min until the fineness is lower than 40 mu m to obtain the solvent chemical milling protective paint.
Comparative example 3
The comparative example provides a solvent type chemical milling protective coating, which comprises the following components in parts by weight:
(1) Preparing solvent type chemical milling protective paint: 330g of tetrachloroethylene was added to a 1000ml beaker and stirred mechanically (at 900 r/min); slowly adding 10g of linear SEBS thermoplastic elastomer into a beaker, and stirring at a high speed until the linear SEBS thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); repeating the above process, adding 60g of linear SEBS thermoplastic elastomer in total, and stirring at high speed until the thermoplastic elastomer is completely dissolved (the rotating speed is 900 r/min); 35g of C5 hydrogenated petroleum resin, 220g of tetrachloroethylene and 6g of PS are directly added into a beaker, and the beaker is placed in a water bath kettle, and is mechanically stirred at a high speed for 2 hours (the rotating speed is 900 r/min) for cooling; sequentially adding 90g of talcum powder, 8g of silica and 2g of fumed silica into a beaker, slowly adding the talcum powder, the 8g of silica and the 2g of fumed silica in batches, sealing the beaker by using a preservative film, stirring at a low speed for 60min (the rotating speed is 600 r/min) until the talcum powder, the 8g of silica and the 2g of fumed silica are uniformly mixed, stopping stirring, and cooling; transferring the cooled paint to a sand mill, and sanding for 10min until the fineness is lower than 40 mu m to obtain the solvent type chemical milling protective paint.
Test case
The solvent-based milling protective coatings prepared in examples 1-7 and comparative examples 1-3 were subjected to performance testing, and specific test items and methods are as follows:
preparation of test samples: the solvent-based chemical milling protective paint prepared above was coated on an aluminum plate by brushing, brushing for 4 times at 5min intervals, brushing for the next time, and drying at 25℃for 48 hours, wherein the dry film thicknesses of examples 1 to 7 were 188 μm,190 μm,185 μm,24 μm,195 μm,205 μm,189 μm, and the dry film thicknesses of comparative examples 1 to 3 were 190 μm,170 μm,195 μm, respectively. Performance tests were performed separately, with test results shown in tables 1 and 2.
Viscosity test: a coating-4 viscometer was chosen for testing with reference to standard GB/T2794-1995.
And (3) engraving test: samples were prepared with reference to standard HB 5453-2004 and the edge condition of the substrate was observed for corrosion.
Etching ratio test: samples were prepared and tested against the standard HB 5453-2004 to calculate the etching ratio.
Acid resistance test: adopts HNO with the concentration of 400g/L 3 And (3) immersing the substrate in the solution for 3 hours, and observing the coating state.
Alkali resistance test: a NaOH solution with a concentration of 300g/L was used, and the coating state was observed by immersing in the solution for 8 hours.
Peel strength test: the sample size was prepared, measured, and the peel strength was calculated, with reference to standard GB/T2790-1995, 400mm long, 25 mm.+ -. 0.5mm wide and 1.8-2mm thick.
Tensile strength test: dumbbell type I samples were prepared with reference to standard GB/T528-2009, tested with 500mm/min tensile speed parameters, and tensile strength was calculated with reference to this standard.
Elongation at break test: dumbbell type I samples were prepared with reference to standard GB/T528-2009, tested with 500mm/min parameters, and elongation at break was calculated with reference to this standard.
And (3) sizing material residue test: the residual state of the glue was observed by naked eyes.
TABLE 1
TABLE 2
The test results of the solvent type chemical milling protective coating in the embodiment and the comparative example show that the addition of the reinforcing resin can effectively ensure the erosion ratio of chemical milling and keep straight and smooth etching, improve the adhesive force of a glue film, avoid the occurrence of film bleaching during chemical milling, and simultaneously adjust the tensile strength of the paint film, so that the chemical milling protective coating has proper peeling strength, and no sizing material residue exists on the surface of a base material after the paint is peeled. The paint has the appearance of uniform viscous fluid, no visible impurities, good leveling property, uniform coating film, acid and alkali resistance and moderate peel strength.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. The solvent type chemical milling protective coating is characterized by comprising the following components in percentage by mass:
wherein the reinforcing resin is a mixed solution of tackifying resin and polystyrene dissolved in a second solvent.
2. The solvent-borne milling protective coating according to claim 1, wherein the reinforcing resin consists of (3-10) by mass: (0.6-3): the tackifying resin of (10-30), polystyrene and a second solvent.
3. The solvent-borne chemical milling protective coating according to claim 1 or 2, wherein the tackifying resin is at least one of phenolic resin, hydrogenated petroleum resin, poly- α -methylstyrene resin;
optionally, the hydrogenated petroleum resin is at least one of a C5 hydrogenated petroleum resin and a C9 hydrogenated petroleum resin.
4. The solvent borne milling protective coating according to claim 1 or 2, wherein the SEBS thermoplastic elastomer is at least one of a linear SEBS thermoplastic elastomer, a star SEBS thermoplastic elastomer;
and/or the filler is at least one of talcum powder, kaolin, nano calcium carbonate, silica and fumed silica;
and/or the first solvent is at least one of tetrachloroethylene, trichloromethane, ethyl acetate, methyl isobutyl ketone and 2-butanone;
and/or the second solvent is at least one of tetrachloroethylene, trichloromethane, ethyl acetate, methyl isobutyl ketone and 2-butanone;
and/or the first solvent is the same as the second solvent.
5. Solvent-borne milling protective coating according to any one of claims 1 to 4, characterized in that the filler consists of (8.2-15.5) by mass: (0.2-1.1): (0.25-1.0) talc, silica and fumed silica.
6. The solvent-borne chemical milling protective coating according to claim 1, wherein the dissolution temperature of the reinforcing resin is 10-50 ℃ and the dissolution time is 2-12h.
7. A method of preparing a solvent borne milling protective coating according to any one of claims 1 to 6, comprising the steps of:
s1, dissolving an SEBS thermoplastic elastomer into a first solvent, adding reinforcing resin, and stirring;
s2, adding filler, mixing and grinding to obtain the solvent type chemical milling protective coating.
8. The method for preparing the solvent-based chemical milling protective coating according to claim 7, wherein in the step S1, the stirring time is 0.5-3h.
9. The method for preparing a solvent-based chemical milling protective coating according to claim 7, wherein in the step S2, the grinding is performed until the fineness is less than or equal to 40 μm.
10. The method for preparing solvent-borne chemical milling protective coating according to any one of claims 7 to 9, wherein in step S2, the mixing time is 30 to 90min and the grinding time is 1 to 30min.
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| CN114163876A (en) * | 2021-12-13 | 2022-03-11 | 中昊北方涂料工业研究设计院有限公司 | Quick-drying repair adhesive for chemical milling and preparation method thereof |
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