CN109173347B - Multilayer flexible composite oil absorption bag and preparation method thereof - Google Patents
Multilayer flexible composite oil absorption bag and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0202—Separation of non-miscible liquids by ab- or adsorption
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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Abstract
The invention relates to a multilayer flexible composite oil absorption bag and a preparation method thereof, wherein the oil absorption bag at least comprises three layers: the oil absorption bag is prepared by compounding a natural porous material, cloth coated with hydrophobic nano-porous and micro-porous materials and cloth coated with resin. Compared with the prior art, the preparation method of the oil absorption bag is convenient and has the characteristic of flexibility; can quickly and effectively absorb mineral oil, diesel oil, kerosene, edible oil and the like, toluene and other organic liquids; the water absorption rate is low, the environment is friendly, and secondary pollution can not be caused; can be used for a plurality of times; therefore, the method has wide application prospect.
Description
Technical Field
The invention relates to a novel functional environment-friendly product, in particular to a multilayer flexible composite oil absorption bag with the functions of oil-water separation and organic liquid absorption and a preparation method thereof.
Background
The rapid development of modern society and economy cannot be supported by oil, but with continuous exploitation and transportation of oil, a plurality of oil accidents such as blowout, oil conveying pipeline fracture, offshore oil exploitation platform leakage, sunken ship, ship collision, oil leakage and the like occur, and serious waste of oil resources is caused. For example, oil spill accidents occur in 2011 and 6 months in the Penglai 19-3 oil field developed by the United states of China and the China sea oil in cooperation, the deep water horizon of a drilling platform rented in the gulf of Mexico in 2010 and 20 days in 2010, the United kingdom oil company explodes, and the east sea ship collision accident occurs in 2018 and 1 month, so that a great amount of oil is leaked, and the economic and environmental tragedies are formed. Petroleum resources are of vital importance to us, while water resources are also an important resource on which humans live.
The most effective method for organic liquids such as oil is to use oil-absorbing materials. The oil absorption materials are divided into organic oil absorption materials formed naturally, organic oil absorption materials synthesized chemically and powder materials, and the most common materials researched at present are organic synthetic materials. The oil absorption material formed naturally has certain oil absorption characteristic and low price, but does not have the oil-water separation characteristic.
Therefore, the oil absorption material which can effectively intercept and adsorb the organic matters on the water surface, has controllable cost and convenient preparation process is needed in the field. Therefore, an oil absorption bag which is efficient and can separate oil from water is needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the multilayer flexible composite oil absorption bag which is high in oil absorption efficiency, can be repeatedly used and is stable in performance and the preparation method thereof.
The purpose of the invention can be realized by the following technical scheme: the multi-layer flexible composite oil absorption bag is characterized by comprising at least three layers: the oil absorption bag is prepared by compounding a natural porous material, cloth coated with hydrophobic nano-porous and micro-porous materials and cloth coated with resin.
The natural porous material comprises one or more of cotton, straw, popcorn, wood chips, leaves, bentonite, clay and vermiculite.
The base material of the cloth coated with the hydrophobic nano-porous or micro-porous material comprises one or more of glass fiber cloth, cotton cloth, polysulfonamide fiber cloth, aramid fiber cloth, quartz fiber cloth, carbon fiber cloth and composite fiber cloth.
The nano-material and the micron material coated on the cloth coated with the hydrophobic nano-pore or micron-pore material comprise one or more of vermiculite, bentonite, silicon dioxide, clay, zinc oxide, ferroferric oxide, cellulose, titanium dioxide, graphene and molybdenum disulfide.
The water contact angle of the nano material or the micron material coated by the cloth coated with the hydrophobic nano pore or micron pore material exceeds 90 degrees.
The cloth coated with the hydrophobic nano-pore or micro-pore material is based on at least one layer of cloth, and is processed synchronously or in multiple processes by resin, coupling agent and the nano-pore or micro-pore material to obtain the cloth coated with the hydrophobic nano-pore and micro-pore material;
the resin comprises epoxy resin, phenolic resin, cyanate resin and polyurethane prepolymer; the coupling agent comprises a silane coupling agent and a titanate coupling agent.
The cloth coated with the resin is obtained by taking at least one layer of cloth as a base and processing the cloth by the resin and corresponding auxiliaries; the selected resin comprises epoxy resin, phenolic resin, cyanate resin and polyurethane prepolymer, and the corresponding auxiliary agents comprise curing agents, accelerators, toughening agents, light stabilizers, thickening agents and diluents.
The preparation method of the multilayer flexible composite oil absorption bag is characterized by comprising two schemes
The first scheme comprises the following steps:
(1) preparation of cloth coated with hydrophobic nano-and micro-porous materials:
a) firstly, preparing hydrophobic nano or micron particles, and mixing ethanol, water and ammonia water according to a mass ratio (ethanol: water: ammonia water 20: (1-10) (0.5-5)) adding the mixed solution into a reactor, condensing and refluxing, heating to a proper temperature (generally 60-100 ℃), adding the nano or micron material into the reactor (the mass ratio of the nano or micron material to the mixed solution is 1: 1-10), stirring, adding the materials, reacting for a period of time (generally 0.5-5 h), adding a silane treating agent (nano or micron material: the mass ratio of the silane treating agent is 10: 0.1-10: 5, and the mass ratio) is stirred, then the vacuum pumping is carried out, and the product is placed in an oven to be dried to obtain hydrophobic nano or micron particles;
b) ultrasonically cleaning the cloth by using acetone, ethanol and deionized water, and drying in an oven;
c) preparation of cloth coated with hydrophobic nano-porous and micro-porous materials: soaking the cloth in a resin solution, taking out and curing, then treating the surface of the soaked cloth by using a coupling agent, mixing the hydrophobic nano or micro particles prepared in the step (a) with a small amount of resin (the mass ratio of the resin to the nano or micro particles is 0.1: 100-30: 100), coating the mixture on the surface of the cloth, and then placing the cloth in an oven for drying to obtain the cloth coated with the hydrophobic nano-pore and micro-pore materials. The surface water contact angle exceeds 90 degrees; (the coupling agent is 0.001-3% of the resin dosage)
(2) Preparation of resin-coated cloth:
uniformly mixing resin, a curing agent, an accelerant, a flexibilizer and a diluent (the mass ratio of the resin to the accelerant is 10: 0.1-10: 1, the mass ratio of the resin to the flexibilizer is 10: 0.1-10: 2, and the mass ratio of the resin to the diluent is 10: 0.1-10: 2) to prepare the impregnation liquid of the cloth. Dipping the cloth, taking out and curing;
(3) preparation of the oil absorption bag: and (3) wrapping the cloth prepared in the multiple layers of steps (1) and (2) with a natural porous material layer by layer to obtain the oil absorption bag.
The silane treatment agent in the step (1) comprises: dodecyl Trimethoxysilane (DTMS), hexadecyl trimethoxysilane (HDTMS), Octadecyl Trichlorosilane (OTS), Vinyl Triethoxysilane (VTES), octyl triethoxysilane, vinyl terminated polydimethylsiloxane (V-PDMS), dihydroxy terminated polydimethylsiloxane (PDMS- (OH)).
The curing agent in the step (2) is a curing agent corresponding to the resin, and the amount of the curing agent is the amount required for curing the resin commonly used in the field, and the mass ratio of the resin to the curing agent is generally 10: 0.1-10: 5.
The second scheme comprises the following steps:
(1) preparation of cloth coated with hydrophobic nano-and micro-porous materials:
a) firstly, preparing hydrophobic nano or micron particles, adding a mixed solution of ethanol, water and ammonia water into a reactor (the mass ratio of the ethanol to the water to the ammonia water is 20 (1-10) to (0.5-5)), condensing and refluxing, heating to a proper temperature (generally 60-100 ℃), adding a nano or micron material into the reactor (the mass ratio of the nano or micron material to the mixed solution is 1: 1-10), stirring, adding a silane treating agent after the reaction is finished for a period of time (generally 0.5-5 h), and adding a silane treating agent (the nano or micron material: silane treating agent is 10: 0.1-10: 5, mass ratio), then vacuumized, and the product is placed in an oven to be dried to obtain hydrophobic nano or micro particles;
b) ultrasonically cleaning the cloth with acetone, ethanol and deionized water, putting the cleaned glass fiber cloth into KH550 ethanol solution (with the concentration of 0.001-5%), soaking at normal temperature, and drying in an oven;
c) preparation of cloth coated with hydrophobic nano-and micro-porous materials: mixing the hydrophobic nano or micro particles prepared in the step (a) with a small amount of resin, coating the mixture on the surface of the glass fiber cloth pretreated in the step (b), and then placing the glass fiber cloth in an oven for drying to obtain the cloth coated with the hydrophobic nano or micro pore material. The surface water contact angle exceeds 90 degrees;
(2) preparation of resin-coated cloth:
uniformly mixing resin, a curing agent, an accelerator, a flexibilizer and a diluent (the mass ratio of the resin to the accelerator is 10: 0.1-10: 1, the mass ratio of the resin to the flexibilizer is 10: 0.1-10: 2, and the mass ratio of the resin to the diluent is 10: 0.1-10: 2) to prepare the impregnation liquid of the cloth. Dipping the cloth, taking out and curing;
(3) preparation of the oil absorption bag: and (3) wrapping the cloth prepared in the multiple layers of steps (1) and (2) with a natural porous material layer by layer to obtain the oil absorption bag.
Compared with the prior art, the invention has the following advantages: the prepared oil absorption bag is flexible and can be repeatedly used. Can quickly and effectively absorb mineral oil, diesel oil, kerosene, edible oil and other organic liquids, toluene and other organic liquids, has the water absorption rate of less than 1 percent, and effectively performs oil-water separation. The method is simple to prepare, the raw materials are easy to obtain, the cost is controllable, secondary pollution to the environment cannot be caused, and the method can be used for actual life in a large scale.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
Cotton is selected as a natural porous material, glass fiber cloth is used as a cloth base, and hydrophobic silicon dioxide nano-particles or micro-particles are coated to obtain silicon dioxide coated cloth; and soaking the glass fiber cloth in the epoxy resin solution to obtain the resin-coated glass cloth. And compounding the cotton and the prepared cloth to obtain the oil absorption bag. The oil absorption bag is put into the mixture of the dyed oil and the water, so that the dyed oil is quickly absorbed into the oil absorption bag, the water surface is basically free of oil, and the separation rate can reach more than 99%. And the oil in the oil absorption bag can be extruded and reused, and the stability is good. The absorption capacity of the oil absorption bag is as follows: 11.94 times of diesel oil, 14.90 times of kerosene, 14.01 times of soybean oil, 16.85 times of vacuum pump oil, 12.82 times of paraffin oil and 13.48 times of high-temperature oil.
Example 2
Cotton is selected as a natural porous material, glass fiber cloth is used as a cloth base, and hydrophobic zinc oxide nano-particles are coated to obtain cloth coated with the zinc oxide nano-particles; and soaking the glass fiber cloth in the epoxy resin solution to obtain the glass cloth coated with the resin. And compounding the cotton and the prepared cloth to obtain the oil absorption bag. The oil absorption bag is put into the mixture of the dyed oil and the water, so that the dyed oil is quickly absorbed into the oil absorption bag, the water surface is basically free of oil, and the separation rate can reach more than 99%. And the oil in the oil absorption bag can be extruded and reused, and the stability is good. The absorption capacity of the oil absorption bag is as follows: 12.31 times of diesel oil, 15.07 times of kerosene, 13.59 times of soybean oil, 17.24 times of vacuum pump oil, 12.55 times of paraffin oil and 14.13 times of high temperature oil.
Example 3
Clay is selected as a natural porous material, glass fiber cloth is used as a cloth base, and hydrophobic zinc oxide nano-particles are coated on the glass fiber cloth to obtain cloth coated with the zinc oxide nano-particles; and (3) dipping the glass fiber cloth in a phenolic resin solution to obtain the glass cloth coated with the resin. And compounding clay and the prepared cloth to obtain the oil absorption bag. The oil absorption bag is put into the mixture of the dyed oil and the water, so that the dyed oil is quickly absorbed into the oil absorption bag, the water surface is basically free of oil, and the separation rate can reach more than 99%. And the oil in the oil absorption bag can be extruded out and then repeatedly used, so that the stability is good. The absorption capacity of the oil absorption bag is as follows: 11.81 times of diesel oil, 14.73 times of kerosene, 14.45 times of soybean oil, 17.32 times of vacuum pump oil, 13.07 times of paraffin oil and 14.26 times of high-temperature oil.
Example 4
Selecting carbonized or activated popcorn as a layer of natural porous material, coating hydrophobic silica nanoparticles on glass fiber cloth as a cloth base to obtain cloth coated with silica nanoparticles; and soaking the glass fiber cloth in the epoxy resin solution to obtain the glass cloth coated with the resin. And compounding the carbonized popcorn with the prepared two layers of cloth to obtain the oil absorption bag. Obtaining the oil absorption bag. The oil absorption bag is put into the mixture of the dyed oil and the water, so that the dyed oil is quickly absorbed into the oil absorption bag, the water surface is basically free of oil, and the separation rate can reach more than 99%. And the oil in the oil absorption bag can be extruded and reused, and the stability is good. The absorption capacity of the oil absorption bag is as follows: 8.24 times of diesel oil, 7.66 times of kerosene, 8.81 times of soybean oil, 11.77 times of vacuum pump oil, 10.88 times of paraffin oil and 13.86 times of high-temperature oil.
Example 5
Selecting carbonized or activated straws as a layer of natural porous material, taking glass fiber cloth as a cloth base, and coating hydrophobic zinc oxide nano-particles to obtain cloth coated with the zinc oxide nano-particles; and soaking the glass fiber cloth in the epoxy resin solution to obtain the glass cloth coated with the resin. And compounding the carbonized or activated straws with the prepared cloth to obtain the composite multilayer flexible oil absorption bag. The oil absorption bag is put into the mixture of the dyed oil and the water, so that the dyed oil is quickly absorbed into the oil absorption bag, the water surface is basically free of oil, and the separation rate can reach more than 99%. And the oil in the oil absorption bag can be extruded and reused, and the stability is good. . The test shows that the absorption capacity of the oil absorption bag is as follows: 6.02-8.31 times of diesel oil, 6.3-8.84 times of kerosene, 5-7.07 times of soybean oil, 6.17-7.28 times of vacuum pump oil, 5.67-6.77 times of paraffin oil and 6.97-7.36 times of high-temperature oil.
Example 6
1) Vermiculite is selected as a natural porous material;
2) preparation of cloth coated with hydrophobic nano-and micro-porous materials:
a) firstly, preparing hydrophobic nano or micron silicon dioxide particles: adding a mixed solution of ethanol, water and ammonia water into a three-neck flask, condensing and refluxing, and raising the temperature to 80 ℃. Then adding the mixed solution of ethyl orthosilicate and ethanol dropwise into the flask, and stirring. After the materials are added and react for a period of time, adding a silane treating agent DTMS, stirring at normal temperature, vacuumizing, and placing a product in an oven to dry to obtain hydrophobic silica particles;
b) ultrasonically cleaning cotton cloth with acetone, ethanol and deionized water, and drying in an oven;
c) preparation of cloth coated with hydrophobic nano-and micro-porous materials: and (b) soaking the cotton cloth treated in the step (b) in a cyanate ester resin solution, taking out and curing, treating the surface of the soaked cloth by using a silane coupling agent, mixing the hydrophobic nano or micro particles prepared in the step (a) with a small amount of cyanate ester resin, and coating the mixture on the surface of the cloth to obtain hydrophobic cloth, wherein the water contact angle of the surface of the hydrophobic cloth exceeds 90 degrees.
3) Preparation of resin-coated cloth: and uniformly mixing the cyanate ester resin, the curing agent, the accelerator, the flexibilizer and the diluent to prepare the impregnation liquid of the cloth. And (5) soaking the cloth, taking out and curing.
4) Preparation of the oil absorption bag: and (4) compounding the cloth prepared in the multilayer steps (2) and (3) with a natural porous material to obtain the oil absorption bag.
The oil absorption bag is put into the mixture of the dyed oil and the water, so that the dyed oil is quickly absorbed into the oil absorption bag, the water surface is basically free of oil, and the separation rate can reach over 99 percent. And the oil in the oil absorption bag can be extruded and reused, and the stability is good. The test shows that the absorption capacity of the oil absorption bag is as follows: 7.12 to 8.55 times of diesel oil, 7.3 to 9.89 times of kerosene, 6.02 to 7.87 times of soybean oil, 7.57 to 8.138 times of vacuum pump oil, 5.627 to 6.98 times of paraffin oil and 6.79 to 7.55 times of high-temperature oil.
Example 7
1) Selecting bentonite as a natural porous material;
2) preparation of cloth coated with hydrophobic nano-and micro-porous materials:
a) firstly, preparing hydrophobic nano zinc oxide particles: adding a mixed solution of ethanol, water and ammonia water into a three-neck flask, condensing and refluxing, and raising the temperature to 90 ℃; adding zinc oxide, stirring, adding a silane treating agent DTMS, stirring, vacuumizing, and drying a product in an oven to obtain hydrophobic zinc oxide particles;
b) ultrasonically cleaning glass fiber cloth with acetone, ethanol and deionized water, putting the cleaned glass fiber cloth into KH550 ethanol solution, soaking at normal temperature, and drying in an oven;
c) preparation of cloth coated with hydrophobic nanopore and nanopore materials: blending the hydrophobic nano-particles prepared in the step (a) with a small amount of epoxy resin, coating the mixture on the surface of the cloth treated in the step (b), and then placing the cloth in an oven for drying to obtain the cloth coated with the hydrophobic nano-pore and micro-pore materials, wherein the surface water contact angle of the cloth exceeds 90 degrees;
3) preparation of resin-coated cloth: and uniformly mixing the polyurethane prepolymer, the curing agent, the accelerator, the flexibilizer and the diluent to prepare the impregnation liquid of the cloth. And (5) soaking the cloth, taking out and curing.
4) Preparation of the oil absorption bag: and (3) coating the cloth prepared in the multiple layers of steps 2 and 3 with a natural porous material layer by layer to obtain the oil absorption bag.
The oil absorption bag is put into the mixture of the dyed oil and the water, so that the dyed oil is quickly absorbed into the oil absorption bag, the water surface is basically free of oil, and the separation rate can reach more than 99%. And the oil in the oil absorption bag can be extruded out and then repeatedly used, so that the stability is good. The test shows that the absorption capacity of the oil absorption bag is as follows: 9.02 times of diesel oil, 10.91 times of kerosene, 13.09 times of soybean oil, 14.85 times of vacuum pump oil, 10.82 times of paraffin oil and 12.48 times of high-temperature oil.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (7)
1. The multi-layer flexible composite oil absorption bag is characterized by comprising at least three layers: the natural porous material, the cloth coated with the hydrophobic nano-porous or micro-porous material and the cloth coated with the resin are compounded to obtain the oil absorption bag; the basic material of the cloth coated with the hydrophobic nano-pore or micro-pore material comprises one or more of glass fiber cloth, cotton cloth, polysulfonamide fiber cloth, aramid fiber cloth, quartz fiber cloth, carbon fiber cloth and composite fiber cloth; the nano material and the micron material coated on the cloth coated with the hydrophobic nano-pore or micron-pore material comprise one or more of vermiculite, bentonite, silicon dioxide, clay, zinc oxide, ferroferric oxide, cellulose, titanium dioxide, graphene and molybdenum disulfide;
the preparation of the multilayer flexible composite oil absorption bag comprises the following steps:
(1) preparation of cloth coated with hydrophobic nano-or micro-porous material:
a) firstly, preparing hydrophobic nano or micro particles, adding a mixed solution of ethanol, water and ammonia water into a reactor, condensing and refluxing, heating to 60-100 ℃, adding reactants into the reactor, stirring, adding a silane treating agent after the reaction is finished for a period of time, vacuumizing, and drying a product in an oven to obtain the hydrophobic nano or micro particles;
b) ultrasonically cleaning the cloth by using acetone, ethanol and deionized water, and drying in an oven;
c) preparation of cloth coated with hydrophobic nano-or micro-porous material: soaking the cloth in a resin solution, taking out and curing, then treating the surface of the soaked cloth by using a coupling agent, mixing the hydrophobic nano or micro particles prepared in the step (a) with a small amount of resin, and coating the mixture on the surface of the cloth to obtain the cloth coated with the hydrophobic nano-pore and micro-pore materials;
(2) preparation of resin-coated cloth:
uniformly mixing resin, a curing agent, an accelerant, a toughening agent and a diluent to prepare an impregnation liquid of the cloth, impregnating the cloth, taking out and curing;
(3) preparation of the oil absorption bag: compounding the cloth prepared in the multi-layer step (1) and the multi-layer step (2) with a natural porous material to prepare an oil absorption bag;
in the step (3), the cloth prepared in the multiple layers of the steps (1) and (2) and the natural porous material are wrapped layer by layer to obtain the oil absorption bag.
2. The multilayer flexible composite oil absorption bag according to claim 1, wherein the natural porous material comprises one or more of cotton, straw, popcorn, wood chips, leaves, bentonite, clay and vermiculite.
3. The multilayer flexible composite oil absorption bag according to claim 1, wherein the cloth coated with hydrophobic nano-or micro-porous material has a water contact angle of more than 90 degrees.
4. The multi-layer flexible composite oil absorption bag according to claim 1, wherein the cloth coated with the hydrophobic nano-porous or micro-porous material is based on at least one layer of cloth, and is processed by resin, coupling agent and nano-material or micro-material synchronously or in multiple processes to obtain the cloth coated with the hydrophobic nano-porous or micro-porous material;
the resin comprises epoxy resin, phenolic resin, cyanate resin and polyurethane prepolymer; the coupling agent comprises a silane coupling agent and a titanate coupling agent.
5. The multilayer flexible composite oil absorption bag according to claim 1, wherein the cloth coated with the resin is obtained by treating at least one layer of cloth as a base with the resin and corresponding auxiliary agents; the selected resin comprises epoxy resin, phenolic resin, cyanate resin and polyurethane prepolymer, and the corresponding auxiliary agents comprise a curing agent, an accelerator, a toughening agent, a light stabilizer, a thickening agent and a diluting agent.
6. A method for preparing the multilayer flexible composite oil absorption bag according to claim 1, which is characterized by comprising the following steps:
(1) preparation of cloth coated with hydrophobic nano-or micro-porous material:
a) firstly, preparing hydrophobic nano or micron particles, adding a mixed solution of ethanol, water and ammonia water into a reactor, condensing and refluxing, heating to 60-100 ℃, adding reactants into the reactor, stirring, adding a silane treating agent after the reaction is finished for a period of time, vacuumizing, and placing a product in an oven to dry to obtain the hydrophobic nano or micron particles;
b) ultrasonically cleaning the cloth by using acetone, ethanol and deionized water, and drying in an oven;
c) preparation of cloth coated with hydrophobic nano-or micro-porous material: soaking the cloth in a resin solution, taking out and curing, then treating the surface of the soaked cloth by using a coupling agent, mixing the hydrophobic nano or micro particles prepared in the step (a) with a small amount of resin, and coating the mixture on the surface of the cloth to obtain the cloth coated with the hydrophobic nano-pore and micro-pore materials;
(2) preparation of resin-coated cloth:
uniformly mixing resin, a curing agent, an accelerant, a toughening agent and a diluent to prepare an impregnation liquid of the cloth, impregnating the cloth, taking out and curing;
(3) preparation of the oil absorption bag: and (3) compounding the cloth prepared in the multi-layer step (1) and the step (2) with a natural porous material to prepare the oil absorption bag.
7. The method for preparing the multilayer flexible composite oil absorption bag according to claim 6, wherein the silane treatment agent in the step (1) comprises: dodecyl Trimethoxysilane (DTMS), hexadecyl trimethoxysilane (HDTMS), Octadecyl Trichlorosilane (OTS), Vinyl Triethoxysilane (VTES), octyl triethoxysilane, vinyl terminated polydimethylsiloxane (V-PDMS), dihydroxy terminated polydimethylsiloxane (PDMS- (OH));
the curing agent in the step (2) is a curing agent corresponding to the resin.
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