CN114015101A - Ocean engineering pipeline prepared based on aerogel coating and preparation method thereof - Google Patents
Ocean engineering pipeline prepared based on aerogel coating and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of ocean engineering, in particular to an ocean engineering pipeline prepared based on aerogel coating and a preparation method thereof. The rubber pipe comprises a rubber pipe and aerogel coating, wherein the rubber pipe comprises the following raw materials: silicone rubber, chlorinated butyl rubber, polyvinyl chloride resin and a modifier; the aerogel coating comprises the following raw materials: in the marine engineering pipeline prepared based on the aerogel coating, after a rubber pipeline is soaked in the aerogel coating, the aerogel coating is rapidly cured through the drying effect, so that a film layer with the fireproof, heat-preservation and heat-insulation effects is formed on the surface of the pipeline.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to an ocean engineering pipeline prepared based on aerogel coating and a preparation method thereof.
Background
With the increasing development of middle sea oil and gas development projects, the demand of submarine pipelines for exploiting marine oil and gas field resources is increasing, the working conditions of submarine pipeline transportation systems are often extremely complex and harsh, generally, pipelines are needed for transporting media, metal pipelines are mostly used, although the pipelines have high toughness and strength, the heat insulation performance is poor, the pipelines are required to have good heat insulation performance due to the fact that a large number of oil media are transported in the pipelines, otherwise, the danger of harming lives and properties of people is easily caused, and therefore the defects of the prior art are overcome by the aid of the aerogel pipelines with the heat insulation performance.
Disclosure of Invention
The invention aims to provide an ocean engineering pipeline prepared based on aerogel coating and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides an ocean engineering pipeline prepared based on aerogel coating, which comprises a rubber pipeline and aerogel coating, wherein the rubber pipeline comprises the following raw materials in percentage by mass: 20-30% of silicon rubber, 10-20% of chlorinated butyl rubber, 10-20% of polyvinyl chloride resin and 15-19% of modifier;
the aerogel coating comprises the following raw materials in percentage by mass: 30-50% of nano silicon dioxide aerogel, 20-30% of waterborne polyurethane-epoxy composite resin, 1-5% of penetrating agent, 1-5% of flow increasing agent and 1-5% of curing agent, wherein the added aerogel coating is used for the outer wall of the pipeline, so that the heat insulation property of the pipeline can be improved.
As a further improvement of the technical scheme, the modifier comprises the following raw materials: the strength and toughness of the pipeline can be improved by adding the modifier.
As a further improvement of the technical scheme, the penetrant is one or more of di-sec-octyl maleate sodium sulfonate, sodium alkyl benzene sulfonate, alkyl succinate alkyl sulfonate sodium, fatty alcohol-polyoxyethylene ether and alkylphenol polyoxyethylene ether, so that the permeability of the aerogel coating is improved, and the aerogel coating can be fully fused with the rubber pipeline.
As a further improvement of the technical scheme, the flow increasing agent is selected from at least one of talcum powder, glycerol and calcium-based grease and is used for increasing the flowability of the aerogel coating.
As a further improvement of the technical scheme, the curing agent is selected from one or a mixture of more of dicyandiamide, boron nitride ethylamine complex, phthalic anhydride and maleic anhydride, can be cured at high temperature, can be applied to aerogel coatings, and can select curing time and place through temperature, so that the preparation of marine engineering pipelines is facilitated.
As a further improvement of the technical scheme, the preparation method of the aerogel coating comprises the following steps: adding the waterborne polyurethane-epoxy composite resin into a stirring kettle, heating to 270-.
As a further improvement of the technical scheme, the preparation method of the modifier comprises the following steps: adding the aldehyde ketone resin and the acrylic resin into a mixing roll, heating and melting, then adding acetic acid and ethanol, mixing and stirring to form a solution, and then sequentially adding the carbon black powder, the argil powder and the wollastonite powder, and stirring to obtain the acrylic resin.
In another aspect, the present invention provides a method for preparing a marine engineering pipeline prepared based on an aerogel coating according to any one of the above methods, comprising the following steps:
s1, adding the silicone rubber, the chlorinated butyl rubber and the polyvinyl chloride resin into a mixing roll, heating to 200-240 ℃ for melt mixing, and adding the modifier for stirring to obtain a rubber solution;
s2, adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain a rubber pipeline;
s3, pouring the aerogel coating into a charging basket, and then putting the charging basket into a rubber pipeline to soak for 0.5-2 h;
and S4, fishing out the soaked rubber pipeline, placing the rubber pipeline in an oven for drying, and cooling to obtain the finished rubber pipeline.
Preferably, in the S3, the temperature of the charging basket is 50-70 ℃.
Preferably, in the S4, the oven temperature is 180-230 ℃.
After the rubber pipeline is soaked by the aerogel coating, the viscous resin on the surface of the pipeline is separated out and blended with the resin in the aerogel coating under the action of high temperature, and the mixture is cured again under the action of high temperature, so that the pipeline and the coating are strongly bonded.
Compared with the prior art, the invention has the beneficial effects that:
in the ocean engineering pipeline prepared based on the aerogel coating and the preparation method thereof, after the rubber pipeline is soaked in the aerogel coating, the aerogel coating is rapidly cured through the drying effect, so that a film layer with the fireproof, heat-preservation and heat-insulation effects is formed on the surface of the pipeline.
Drawings
FIG. 1 is an overall flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1 marine engineering pipe prepared based on aerogel coating and preparation method thereof, comprising:
preparation of aerogel coating
Adding 30% of waterborne polyurethane-epoxy composite resin into a stirring kettle, heating to 330 ℃, adding 0.5% of penetrating agent, 0.5% of flow increasing agent and 0.5% of curing agent, mixing and stirring for 2 hours, then cooling to 190 ℃, adding 30% of nano silicon dioxide aerogel, and stirring for 3 hours by an ultrasonic disperser to obtain the nano silicon dioxide aerogel.
II, preparation of modifier
Adding the aldehyde ketone resin and the acrylic resin into a mixing roll, heating and melting, then adding acetic acid and ethanol, mixing and stirring to form a solution, and then sequentially adding the carbon black powder, the argil powder and the wollastonite powder, and stirring to obtain the acrylic resin.
Third, pipeline preparation
1. Adding 20% of silicon rubber, 20% of chlorinated butyl rubber and 20% of polyvinyl chloride resin into a mixing roll, heating to 240 ℃ for melting and mixing, adding 15% of modifier, and stirring to obtain rubber liquid;
2. adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain a rubber pipeline;
3. pouring the aerogel coating into a charging basket, heating to 50 ℃, and then putting the charging basket into a rubber pipeline to soak for 0.5 h;
4. and fishing out the soaked rubber pipeline, placing the rubber pipeline in an oven, heating to 180 ℃, drying, and cooling to obtain a finished rubber pipeline.
Embodiment 2 ocean engineering pipeline prepared based on aerogel coating and its preparation method includes:
preparation of aerogel coating
Adding 27.5% of waterborne polyurethane-epoxy composite resin into a stirring kettle, heating to 310 ℃, adding 0.4% of penetrating agent, 0.4% of flow increasing agent and 0.4% of curing agent, mixing and stirring for 2 hours, then cooling to 180 ℃, adding 35% of nano silicon dioxide aerogel, and stirring for 3 hours by an ultrasonic disperser to obtain the polyurethane-epoxy composite resin.
II, preparation of modifier
Adding the aldehyde ketone resin and the acrylic resin into a mixing roll, heating and melting, then adding acetic acid and ethanol, mixing and stirring to form a solution, and then sequentially adding the carbon black powder, the argil powder and the wollastonite powder, and stirring to obtain the acrylic resin.
Third, pipeline preparation
1. Adding 22.5% of silicon rubber, 17.5% of chlorinated butyl rubber and 17.5% of polyvinyl chloride resin into a mixing roll, heating to 230 ℃ for melting and mixing, adding 16% of modifier, and stirring to obtain rubber liquid;
2. adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain a rubber pipeline;
3. pouring the aerogel coating into a charging basket, heating to 55 ℃, and then putting the charging basket into a rubber pipeline to soak for 1 h;
4. and fishing out the soaked rubber pipeline, placing the rubber pipeline in an oven, heating to 190 ℃, drying, and cooling to obtain a finished rubber pipeline.
Embodiment 3 ocean engineering pipeline prepared based on aerogel coating and preparation method thereof, including:
preparation of aerogel coating
Adding 25% of waterborne polyurethane-epoxy composite resin into a stirring kettle, heating to 300 ℃, adding 0.3% of penetrating agent, 0.3% of flow increasing agent and 0.3% of curing agent, mixing and stirring for 1.5h, then cooling to 170 ℃, adding 40% of nano silicon dioxide aerogel, and stirring for 2.5h through an ultrasonic disperser to obtain the polyurethane-epoxy composite resin.
II, preparation of modifier
Adding the aldehyde ketone resin and the acrylic resin into a mixing roll, heating and melting, then adding acetic acid and ethanol, mixing and stirring to form a solution, and then sequentially adding the carbon black powder, the argil powder and the wollastonite powder, and stirring to obtain the acrylic resin.
Third, pipeline preparation
1. Adding 25% of silicone rubber, 15% of chlorinated butyl rubber and 15% of polyvinyl chloride resin into a mixing roll, heating to 220 ℃ for melting and mixing, adding 17% of modifier, and stirring to obtain a rubber solution;
2. adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain a rubber pipeline;
3. pouring the aerogel coating into a charging basket, heating to 60 ℃, and then putting the charging basket into a rubber pipeline to soak for 1.5 hours;
4. and fishing out the soaked rubber pipeline, placing the rubber pipeline in an oven, heating to 210 ℃, drying, and cooling to obtain a finished rubber pipeline.
Example 4 marine engineering pipe prepared based on aerogel coating and method of preparation thereof, comprising:
preparation of aerogel coating
Adding 22.5% of waterborne polyurethane-epoxy composite resin into a stirring kettle, heating to 290 ℃, adding 0.2% of penetrating agent, 0.2% of flow increasing agent and 0.2% of curing agent, mixing and stirring for 1h, then cooling to 160 ℃, adding 45% of nano silicon dioxide aerogel, and stirring for 2h through an ultrasonic disperser to obtain the polyurethane-epoxy composite resin.
II, preparation of modifier
Adding the aldehyde ketone resin and the acrylic resin into a mixing roll, heating and melting, then adding acetic acid and ethanol, mixing and stirring to form a solution, and then sequentially adding the carbon black powder, the argil powder and the wollastonite powder, and stirring to obtain the acrylic resin.
Third, pipeline preparation
1. Adding 27.5% of silicone rubber, 12.5% of chlorinated butyl rubber and 12.5% of polyvinyl chloride resin into a mixing roll, heating to 210 ℃ for melting and mixing, adding 18% of modifier, and stirring to obtain a rubber solution;
2. adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain a rubber pipeline;
3. pouring the aerogel coating into a charging basket, heating to 65 ℃, and then putting the charging basket into a rubber pipeline to soak for 2 hours;
4. and fishing out the soaked rubber pipeline, placing the rubber pipeline in an oven, heating to 220 ℃, drying, and cooling to obtain a finished rubber pipeline.
Example 5 marine engineering pipe prepared based on aerogel coating and method of preparation thereof, comprising:
preparation of aerogel coating
Adding 20% of waterborne polyurethane-epoxy composite resin into a stirring kettle, heating to 270 ℃, adding 0.1% of penetrating agent, 0.1% of flow increasing agent and 0.1% of curing agent, mixing and stirring for 1h, then cooling to 150 ℃, adding 50% of nano silicon dioxide aerogel, and stirring for 2h through an ultrasonic disperser to obtain the nano silicon dioxide aerogel.
II, preparation of modifier
Adding the aldehyde ketone resin and the acrylic resin into a mixing roll, heating and melting, then adding acetic acid and ethanol, mixing and stirring to form a solution, and then sequentially adding the carbon black powder, the argil powder and the wollastonite powder, and stirring to obtain the acrylic resin.
Third, pipeline preparation
1. Adding 30% of silicon rubber, 10% of chlorinated butyl rubber and 10% of polyvinyl chloride resin into a mixing roll, heating to 200 ℃ for melting and mixing, adding 19% of modifier, and stirring to obtain rubber liquid;
2. adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain a rubber pipeline;
3. pouring the aerogel coating into a charging basket, heating to 70 ℃, and then putting the charging basket into a rubber pipeline for soaking for 2 hours;
4. and fishing out the soaked rubber pipeline, placing the rubber pipeline in an oven, heating to 230 ℃, drying, and cooling to obtain a finished rubber pipeline.
In the above embodiments 1-5, the penetrant is selected from one or more of di-sec-octyl maleate sodium sulfonate, sodium alkyl benzene sulfonate, sodium alkyl sulfosuccinate, fatty alcohol-polyoxyethylene ether, and alkylphenol ethoxylates, so as to improve the permeability of the aerogel coating, and enable the aerogel coating to be fully fused with the rubber pipeline;
the flow increasing agent is selected from at least one of talcum powder, glycerol and calcium-based grease and is used for increasing the flowability of the aerogel coating;
the curing agent is selected from one or more of dicyandiamide, boron nitride ethylamine complex, phthalic anhydride and maleic anhydride, can be cured at high temperature, can be applied to aerogel coatings, and can select curing time and place through temperature, so that the preparation of marine engineering pipelines is facilitated.
The relevant indexes of the marine engineering pipeline prepared based on the aerogel coating are shown in the table 1:
TABLE 1
| Coefficient of thermal conductivity (W/m. K) | Flame retardant grade (grade) | Compressive strength (Mpa) | Notch shear strength (Mpa) | |
| Example 1 | 0.0352 | A | 149 | 349 |
| Example 2 | 0.0337 | A | 163 | 357 |
| Example 3 | 0.0251 | A | 181 | 371 |
| Example 4 | 0.0319 | A | 157 | 350 |
| Example 5 | 0.0333 | A | 161 | 353 |
As shown in table 1, the rubber pipes prepared in examples 1 to 5 have low thermal conductivity coefficients, and flame retardant grades are all class a, and class a is a classification grade of a noncombustible material according to national standard GB8624-2012 of China; meanwhile, the rubber pipelines in the embodiments 1 to 5 have better compressive strength and incision shearing strength.
Comparative example 1 an oceanographic engineering pipe comprising:
firstly, preparation of modifier
Adding the aldehyde ketone resin and the acrylic resin into a mixing roll, heating and melting, then adding acetic acid and ethanol, mixing and stirring to form a solution, and then sequentially adding the carbon black powder, the argil powder and the wollastonite powder, and stirring to obtain the acrylic resin.
Second, pipeline preparation
1. Adding 25% of silicone rubber, 15% of chlorinated butyl rubber and 15% of polyvinyl chloride resin into a mixing roll, heating to 220 ℃ for melting and mixing, adding 17% of modifier, and stirring to obtain a rubber solution;
2. and adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain the rubber pipeline.
Comparative example 2 an oceanographic engineering pipe comprising:
preparation of aerogel coating
Adding 25% of waterborne polyurethane-epoxy composite resin into a stirring kettle, heating to 300 ℃, adding 0.3% of penetrating agent, 0.3% of flow increasing agent and 0.3% of curing agent, mixing and stirring for 1.5h, then cooling to 170 ℃, adding 40% of nano silicon dioxide aerogel, and stirring for 2.5h through an ultrasonic disperser to obtain the polyurethane-epoxy composite resin.
Second, pipeline preparation
1. Adding 25% of silicon rubber, 15% of chlorinated butyl rubber and 15% of polyvinyl chloride resin into a mixing roll, heating to 220 ℃ for melting and mixing to obtain rubber liquid;
2. adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain a rubber pipeline;
3. pouring the aerogel coating into a charging basket, heating to 60 ℃, and then putting the charging basket into a rubber pipeline to soak for 1.5 hours;
4. and fishing out the soaked rubber pipeline, placing the rubber pipeline in an oven, heating to 210 ℃, drying, and cooling to obtain a finished rubber pipeline.
Comparative example 3 an oceanographic engineering pipe comprising:
1. adding 25% of silicon rubber, 15% of chlorinated butyl rubber and 15% of polyvinyl chloride resin into a mixing roll, heating to 220 ℃ for melting and mixing to obtain rubber liquid;
2. and adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain the rubber pipeline.
The ocean engineering pipeline prepared based on the aerogel coating has good fireproof heat insulation performance and strength, and has a great relationship with a modifier and the aerogel coating added into the ocean engineering pipeline, and in order to verify the related technical scheme, the applicant performs the following tests:
comparative examples 1 to 3: by adopting the method of example 3, the prepared rubber pipeline related indexes are detected under the condition that the modifier and the aerogel coating are removed, and the concrete results are shown in table 2:
TABLE 2
| Coefficient of thermal conductivity (W/m. K) | Flame retardant grade (grade) | Compressive strength (Mpa) | Notch shear strength (Mpa) | |
| Comparative example 1 | 0.2251 | B1 | 139 | 308 |
| Comparative example 2 | 0.0937 | A | 55 | 130 |
| Comparative example 3 | 0.3136 | B2 | 39 | 87 |
| Example 3 | 0.0251 | A | 181 | 371 |
According to the table 2, comparing comparative examples 1-3 with example 3, when the aerogel coating is removed alone in comparative example 1, the thermal conductivity of the rubber pipe is increased, the flame retardant grade reaches the flame retardant grade, and the fireproof heat insulation performance is reduced most obviously compared with example 3; the decrease in the compressive strength and the notched shear strength of the rubber pipe is most significant when the modifier is removed alone in comparative example 2 compared to example 3, and the decrease in the flame-retardant insulation, the compressive strength and the notched shear strength of the rubber pipe is significant when the modifier and the aerogel coating are removed together in comparative example 3 compared to example 3.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and the present invention is not limited to the embodiments, and various changes and modifications may be made without departing from the spirit and scope of the present invention, and these changes and modifications fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. Ocean engineering pipeline based on aerogel coating preparation, its characterized in that includes rubber pipeline and aerogel coating, the rubber pipeline includes following mass percent raw materials: 20-30% of silicon rubber, 10-20% of chlorinated butyl rubber, 10-20% of polyvinyl chloride resin and 15-19% of modifier;
the aerogel coating comprises the following raw materials in percentage by mass: 30-50% of nano silicon dioxide aerogel, 20-30% of waterborne polyurethane-epoxy composite resin, 1-5% of penetrating agent, 1-5% of flow enhancer and 1-5% of curing agent.
2. Ocean engineering pipeline prepared based on aerogel coating according to claim 1, characterized in that: the modifier comprises the following raw materials: carbon black powder, clay powder, wollastonite powder, aldehyde ketone resin, acrylic resin and acetic alcohol.
3. Ocean engineering pipeline prepared based on aerogel coating according to claim 1, characterized in that: the penetrant is selected from one or more of di-sec-octyl maleate sodium sulfonate, sodium alkyl benzene sulfonate, alkyl succinate sodium sulfonate, fatty alcohol-polyoxyethylene ether and alkylphenol polyoxyethylene ether.
4. Ocean engineering pipeline prepared based on aerogel coating according to claim 1, characterized in that: the flow increasing agent is at least one of talcum powder, glycerol and calcium-based fat.
5. Ocean engineering pipeline prepared based on aerogel coating according to claim 1, characterized in that: the curing agent is one or more of dicyandiamide, boron nitride ethylamine complex, phthalic anhydride and maleic anhydride.
6. Ocean engineering pipeline prepared based on aerogel coating according to claim 1, characterized in that: the preparation method of the aerogel coating comprises the following steps: adding the waterborne polyurethane-epoxy composite resin into a stirring kettle, heating to 270-.
7. Ocean engineering pipeline prepared based on aerogel coating according to claim 2, characterized in that: the preparation method of the modifier comprises the following steps: adding the aldehyde ketone resin and the acrylic resin into a mixing roll, heating and melting, then adding acetic acid and ethanol, mixing and stirring to form a solution, and then sequentially adding the carbon black powder, the argil powder and the wollastonite powder, and stirring to obtain the acrylic resin.
8. A preparation method for preparing the marine engineering pipeline prepared based on the aerogel coating according to any one of claims 1 to 7, which is characterized by comprising the following steps:
s1, adding the silicone rubber, the chlorinated butyl rubber and the polyvinyl chloride resin into a mixing roll, heating to 200-240 ℃ for melt mixing, and adding the modifier for stirring to obtain a rubber solution;
s2, adding the rubber liquid into a pipeline mold, closing the mold, vulcanizing, stripping and cooling to obtain a rubber pipeline;
s3, pouring the aerogel coating into a charging basket, and then putting the charging basket into a rubber pipeline to soak for 0.5-2 h;
and S4, fishing out the soaked rubber pipeline, placing the rubber pipeline in an oven for drying, and cooling to obtain the finished rubber pipeline.
9. The method for preparing ocean engineering pipeline based on aerogel coating preparation according to claim 8, wherein the method comprises the following steps: in the S3, the temperature of the charging basket is 50-70 ℃.
10. The method for preparing ocean engineering pipeline based on aerogel coating preparation according to claim 8, wherein the method comprises the following steps: in the S4, the oven temperature is 180-230 ℃.
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| CN104553089A (en) * | 2014-10-30 | 2015-04-29 | 河北西伯力特种橡胶有限公司 | Rubber oil pipe with efficient heat protection structure and preparation method of rubber oil pipe |
| CN107523198A (en) * | 2017-07-26 | 2017-12-29 | 贵州省漆彩金州涂料有限公司 | A kind of aerosil coating manufacture craft |
| CN108456327A (en) * | 2018-03-09 | 2018-08-28 | 江苏泛亚微透科技股份有限公司 | It is coated with the EPDM rubber sheet material and its preparation process of aerosil coating |
| CN109517520A (en) * | 2018-11-23 | 2019-03-26 | 航天特种材料及工艺技术研究所 | A kind of aeroge coating, airsetting gel coating and the method by aeroge coating preparation airsetting gel coating |
| CN110527134A (en) * | 2019-08-23 | 2019-12-03 | 张昌录 | It is coated with the rubber sheet and its preparation process of aerosil coating |
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2022
- 2022-01-06 CN CN202210009159.4A patent/CN114015101A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104553089A (en) * | 2014-10-30 | 2015-04-29 | 河北西伯力特种橡胶有限公司 | Rubber oil pipe with efficient heat protection structure and preparation method of rubber oil pipe |
| CN107523198A (en) * | 2017-07-26 | 2017-12-29 | 贵州省漆彩金州涂料有限公司 | A kind of aerosil coating manufacture craft |
| CN108456327A (en) * | 2018-03-09 | 2018-08-28 | 江苏泛亚微透科技股份有限公司 | It is coated with the EPDM rubber sheet material and its preparation process of aerosil coating |
| CN109517520A (en) * | 2018-11-23 | 2019-03-26 | 航天特种材料及工艺技术研究所 | A kind of aeroge coating, airsetting gel coating and the method by aeroge coating preparation airsetting gel coating |
| CN110527134A (en) * | 2019-08-23 | 2019-12-03 | 张昌录 | It is coated with the rubber sheet and its preparation process of aerosil coating |
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