CN113773650B - Silicone rubber sponge and preparation method thereof - Google Patents
Silicone rubber sponge and preparation method thereof Download PDFInfo
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- CN113773650B CN113773650B CN202110873400.3A CN202110873400A CN113773650B CN 113773650 B CN113773650 B CN 113773650B CN 202110873400 A CN202110873400 A CN 202110873400A CN 113773650 B CN113773650 B CN 113773650B
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- carbon black
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- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 45
- 239000004945 silicone rubber Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000006229 carbon black Substances 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 17
- 235000019354 vermiculite Nutrition 0.000 claims abstract description 17
- 239000010455 vermiculite Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 229920001285 xanthan gum Polymers 0.000 claims abstract description 14
- 239000000230 xanthan gum Substances 0.000 claims abstract description 14
- 229940082509 xanthan gum Drugs 0.000 claims abstract description 14
- 235000010493 xanthan gum Nutrition 0.000 claims abstract description 14
- 239000004088 foaming agent Substances 0.000 claims abstract description 13
- 239000011780 sodium chloride Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000005187 foaming Methods 0.000 claims abstract description 10
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 9
- 238000005303 weighing Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 229920001971 elastomer Polymers 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 4
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 238000004073 vulcanization Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000004513 sizing Methods 0.000 claims description 3
- VJRITMATACIYAF-UHFFFAOYSA-N benzenesulfonohydrazide Chemical compound NNS(=O)(=O)C1=CC=CC=C1 VJRITMATACIYAF-UHFFFAOYSA-N 0.000 claims description 2
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 claims description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 2
- 229920001296 polysiloxane Polymers 0.000 claims description 2
- 239000004604 Blowing Agent Substances 0.000 claims 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims 1
- 239000004202 carbamide Substances 0.000 claims 1
- 239000011148 porous material Substances 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000001951 carbamoylamino group Chemical group C(N)(=O)N* 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7404—Mixing devices specially adapted for foamable substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7461—Combinations of dissimilar mixers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/88—Adding charges, i.e. additives
- B29B7/90—Fillers or reinforcements, e.g. fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
- C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
- C08J2383/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a silicone rubber sponge and a preparation method thereof, wherein the silicone rubber sponge comprises the following raw materials in parts by mass: 100 parts of silicon rubber; 10-50 parts of white carbon black; 0.5-10 parts of a structure control agent; 0-100 parts of methyl silicone oil; 3-12 parts of a foaming agent; 5-10 parts of reduced iron powder; 0.5-3 parts of aluminum powder; 2-5 parts of xanthan gum; 1-5 parts of sodium chloride; 3-15 parts of vermiculite; 3-15 parts of activated carbon; 1-4 parts of a vulcanizing agent. The preparation method of the silicone rubber sponge comprises the following steps: weighing raw materials; (2) mixing: mixing by adopting a multi-section mixing method, and standing after each section is mixed; and (3) vulcanizing and foaming. According to the sponge, the reduced iron powder, the aluminum powder, the xanthan gum, the sodium chloride, the vermiculite and the activated carbon are reasonably matched, and after the reduced iron powder, the aluminum powder, the xanthan gum, the sodium chloride, the vermiculite and the activated carbon are combined together, moisture in air can be absorbed for heat release, a certain temperature can be kept in the middle of the sponge, the sponge is promoted to be uniformly foamed, the apparent density of the sponge can be obviously reduced, and the uniformity of the whole pores of the sponge is better.
Description
Technical Field
The invention belongs to the technical field of rubber sponge materials, and particularly relates to a silicone rubber sponge and a preparation method thereof.
Background
The sponge is a widely used porous low-density material, has the characteristics of heat preservation, heat insulation, sound absorption, shock absorption, flame retardance, static prevention, good air permeability and the like, and is widely used in various industries.
The silicone rubber sponge integrates the performance of the silicone elastomer and the performance of the porous material, not only has the characteristics of excellent high and low temperature resistance, aging resistance, good insulating property, physiological inertia, chemical stability and the like of the silicone rubber, but also has the performances of sound insulation, heat insulation, light weight, impact load absorption, sealing and the like of the porous material. Because of excellent comprehensive performance and performance that other elastomers can not replace, the elastomer has better application prospect in the fields of new energy, electronics, orbits, especially national defense. Silicon rubber is generally used as a reinforcing agent by adding white carbon black, and the density is reduced after foaming, so that the heat conducting property of the silicon rubber is reduced, in the foaming process, heat on two sides of equipment or a mould can not be completely transmitted to the middle of the sponge, the interior of the sponge is heated and is inconsistent with two sides of the sponge, the density uniformity of the sponge is further influenced, and meanwhile, the foaming thickness of the sponge is limited because the heat can not reach the middle.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects and shortcomings in the background art and provide a silicone rubber sponge and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the silicone rubber sponge comprises the following raw materials in parts by mass:
the reduced iron powder, the aluminum powder, the xanthan gum, the sodium chloride, the vermiculite and the activated carbon are reasonably matched, and after being combined together, the reduced iron powder, the aluminum powder, the xanthan gum, the sodium chloride, the vermiculite and the activated carbon can absorb moisture in air to release heat, so that the sponge has a certain temperature in the middle and the uniform foaming of the sponge is promoted. Furthermore, the reduced iron powder and the aluminum powder also have good heat conduction effect, and can better conduct heat on equipment or a die to the middle part of the sponge; the vermiculite can absorb moisture in the reaction process, promote the reaction with the reduced iron powder and the aluminum powder, simultaneously has better heat preservation effect, and can keep heat in the middle of the sponge; the xanthan gum can effectively absorb moisture in the air, and further promotes the reaction of each material and the moisture to generate heat.
Preferably, the silicone rubber is one or more of methyl vinyl silicone rubber and phenyl silicone rubber.
Preferably, the white carbon black is one or a combination of two of precipitated white carbon black and gas-phase white carbon black.
Preferably, the structure control agent is hydroxy silicone oil or phenyl silicone glycol.
Preferably, the foaming agent is one or more of azo foaming agents, benzenesulfonyl hydrazide foaming agents and ureido foaming agents; the vulcanizing agent is one or more of a bis-penta vulcanizing agent and a bis-tetratetra vulcanizing agent.
Preferably, the particle size of the reduced iron powder is less than 320 meshes; the particle size of the aluminum powder is less than 100 meshes; the particle size of the vermiculite is less than 50 meshes; the particle size of the activated carbon is less than 320 meshes.
Preferably, the raw materials of the silicone rubber sponge further comprise: 0-100 parts of methyl silicone oil.
As a general inventive concept, the present invention also provides a method for preparing a silicone rubber sponge, comprising the steps of:
(1) Weighing raw materials;
(2) Mixing: mixing by adopting a multi-section mixing method, and standing after each section is mixed;
(3) And (4) vulcanizing and foaming.
In the above preparation method, preferably, the step (2) specifically includes the steps of:
(1) first-stage mixing: mixing the first-stage mixing by adopting an open mill or mixing the first-stage mixing by adopting the open mill and a vacuum internal mixer in a matching way;
when the mixing of the first-stage mixing adopts an open mill, the feeding sequence is as follows: silicone rubber → white carbon black accounting for 30-70% of the total mass of the white carbon black → structural control agent → the rest white carbon black → methyl silicone oil → reduced iron powder, aluminum powder, sodium chloride, vermiculite, activated carbon, xanthan gum → foaming agent and vulcanizing agent, mixing, and sealing and parking for 1-7 days after the obtained rubber material is thinly passed through the lower sheet, wherein the parking environment temperature is lower than 37 ℃;
when an open mill and a vacuum internal mixer are matched for mixing in the first-stage mixing, firstly, the vacuum internal mixer is adopted for mixing, and the feeding sequence is as follows: silicone rubber → white carbon black accounting for 30-70% of the total mass of the white carbon black → structural control agent → the rest white carbon black → methyl silicone oil → sodium chloride, vermiculite, activated carbon and xanthan gum, then mixing by adopting an open mill, and adding foaming agent, reduced iron powder, aluminum powder and vulcanizing agent into the open mill, wherein the roll temperature is less than 60 ℃;
(2) and (3) second-stage mixing: and (2) thinly passing the sizing material obtained after the treatment in the step (1), packaging in a triangular bag, discharging, and sealing and standing for 1-7 days, wherein the standing ambient temperature is less than 37 ℃.
If necessary, three-stage kneading may be carried out.
Preferably, in the step (3), the foam is vulcanized and foamed by a molding method or is not foamed by molding and vulcanization.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, by adding the reduced iron powder, the sodium chloride, the vermiculite, the activated carbon, the xanthan gum and the aluminum powder, the apparent density of the sponge can be obviously reduced, and the overall pore uniformity of the sponge is better.
2. The silicone rubber sponge prepared by the invention has more uniform density and slightly increased thickness compared with the traditional formula.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the invention is not limited to the specific embodiments described below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Comparative examples 1-2 and examples 1-4:
the proportions of the silicone rubber sponge raw materials in comparative examples 1-2 and examples 1-4 are shown in Table 1:
TABLE 1 proportioning table of silicon rubber sponge raw materials (by mass)
| Name of Material | Comparative example 1 | Comparative example 2 | Example 1 | Example 2 | Example 3 | Example 4 |
| Silicone rubber 110-2 | 100 | 100 | 100 | 100 | 100 | 100 |
| White carbon black ZQ356 | 20 | 20 | 20 | 20 | 20 | 20 |
| Hydroxy silicone oil 209 | 3 | 3 | 3 | 3 | 3 | 3 |
| 201 methyl silicone oil | 15 | 15 | 15 | 15 | 15 | 15 |
| Foaming agent AC | 2 | 2 | 1 | 3 | 3 | 2 |
| Foaming agent OBSH | 4 | 4 | 2 | 6 | 6 | 4 |
| Reduced iron powder | 0 | 9 | 9 | 9 | 9 | 4.5 |
| Sodium chloride | 0 | 4 | 4 | 4 | 4 | 2 |
| Vermiculite | 0 | 6 | 6 | 6 | 6 | 3 |
| Xanthan gum | 5 | 0 | 5 | 5 | 5 | 2.5 |
| Aluminum powder | 3 | 0 | 3 | 3 | 3 | 1.5 |
| Activated carbon | 0 | 3 | 3 | 3 | 3 | 1.5 |
| Bierwu vulcanizing agent | 0.5 | 0.5 | 0.5 | 0.5 | 1 | 0.5 |
The particle size of the reduced iron powder in the proportioning table is below 400 meshes; the particle size of the vermiculite is below 60 meshes; the particle size of the aluminum powder is less than 320 meshes; the particle size of the activated carbon is 400 meshes or less.
The preparation method of the silicone rubber sponge comprises the following steps:
(1) Weighing the following raw materials: accurately weighing the raw materials according to the mixture ratio in the table 1;
(2) Mixing:
(1) first-stage mixing: mixing the first-stage mixture by using an open mill, wherein the feeding sequence is as follows: silicon rubber → white carbon black accounting for 40 percent of the total mass of the white carbon black → hydroxyl silicone oil → the rest white carbon black → methyl silicone oil → reduced iron powder, aluminum powder, sodium chloride, vermiculite, activated carbon, xanthan gum → foaming agent and vulcanizing agent, after mixing, the obtained rubber material is thinly put into a slice and then is sealed and parked for 2 days, and the parking environment temperature is lower than 37 ℃;
(2) and (3) second-stage mixing: and (2) thinly passing the sizing material obtained after the treatment in the step (1), packaging in a triangular bag, discharging, and sealing and standing for 2 days, wherein the standing environmental temperature is less than 37 ℃.
(3) And (3) vulcanization foaming: and vulcanizing and foaming by adopting a mould pressing method, accurately weighing the rubber material after preparing the rubber material into a required sheet, and vulcanizing and foaming for 20 minutes in a flat plate at 160 ℃.
The data of the performance tests of the compounds and silicone rubber sponges prepared from the raw materials of comparative examples 1-2 and examples 1-4 by the above-described method are shown in table 2:
TABLE 2 Performance test data for rubber compounds and silicone rubber sponges
As can be seen from Table 2, it can be seen from comparative examples 1-2 and examples 1-4 that the addition of reduced iron powder, sodium chloride, vermiculite, activated carbon, xanthan gum and aluminum powder can significantly reduce the apparent density of the sponge, and the uniformity of the overall pores of the sponge is better. When the amount of the combination is reduced, the apparent density of the sponge increases, and the uniformity of the pores of the sponge becomes poor. In addition, the apparent density of the sponge can be effectively adjusted by adjusting the amounts of the foaming agent and the vulcanizing agent, but the effect on the overall compactness and uniformity of the sponge is not achieved.
Claims (10)
1. The silicone rubber sponge is characterized by comprising the following raw materials in parts by mass:
2. the silicone rubber sponge according to claim 1, wherein the silicone rubber is one or more of methyl vinyl silicone rubber and phenyl silicone rubber.
3. The silicone rubber sponge according to claim 1, wherein the white carbon black is one or a combination of precipitated white carbon black and fumed white carbon black.
4. The silicone rubber sponge according to claim 1, wherein the structure-controlling agent is a hydroxy silicone oil or a phenyl silicone glycol.
5. The silicone rubber sponge according to any one of claims 1 to 4, wherein the blowing agent is one or more of azo blowing agents, benzenesulfonylhydrazide blowing agents, urea blowing agents; the vulcanizing agent is one or more of a bis-penta vulcanizing agent and a bis-tetratetra vulcanizing agent.
6. The silicone rubber sponge according to any one of claims 1 to 4, wherein the reduced iron powder has a particle size of less than 320 mesh; the particle size of the aluminum powder is less than 100 meshes; the particle size of the vermiculite is smaller than 50 meshes; the particle size of the activated carbon is less than 320 meshes.
7. The silicone rubber sponge according to any one of claims 1 to 4, wherein the raw material of the silicone rubber sponge further comprises: 0-100 parts of methyl silicone oil.
8. A method of preparing a silicone rubber sponge according to any of claims 1 to 7, comprising the steps of:
(1) Weighing raw materials;
(2) Mixing: mixing by adopting a multi-section mixing method, and standing after each section is mixed;
(3) And (4) vulcanizing and foaming.
9. The method for preparing the silicone rubber sponge according to claim 8, wherein the step (2) specifically comprises the steps of:
(1) first-stage mixing: mixing by adopting an open mill or mixing by adopting the open mill and a vacuum internal mixer in a matching way;
when the mixing of the first-stage mixing adopts an open mill, the feeding sequence is as follows: silicone rubber → white carbon black accounting for 30-70% of the total mass of the white carbon black → structural control agent → the rest white carbon black → methyl silicone oil → reduced iron powder, aluminum powder, sodium chloride, vermiculite, activated carbon, xanthan gum → foaming agent and vulcanizing agent, mixing, and sealing and parking for 1-7 days after the obtained rubber material is thinly passed through the lower sheet, wherein the parking environment temperature is lower than 37 ℃;
when an open mill and a vacuum internal mixer are matched for mixing in one section of mixing, firstly, the vacuum internal mixer is used for mixing, and the feeding sequence is as follows: silicone rubber → white carbon black accounting for 30-70% of the total mass of the white carbon black → structural control agent → the rest white carbon black → methyl silicone oil → sodium chloride, vermiculite, activated carbon and xanthan gum, then mixing by adopting an open mill, and adding foaming agent, reduced iron powder, aluminum powder and vulcanizing agent into the open mill, wherein the roll temperature is less than 60 ℃;
(2) and (3) second-stage mixing: and (2) thinly passing the sizing material obtained after the treatment in the step (1), packaging in a triangular bag, discharging, and standing in a sealing manner for 1-7 days at the temperature of less than 37 ℃.
10. The method for preparing a silicone rubber sponge according to claim 8 or 9, wherein in step (3), a compression-molded vulcanization foam or a non-compression-molded vulcanization foam is used.
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| DE4120561A1 (en) * | 1991-06-21 | 1992-12-24 | Hilti Ag | ADHESIVE, SEALING AND ADHESIVE MADE ON SILICONE BASE |
| CN101845223B (en) * | 2010-05-06 | 2012-06-20 | 江苏欣安新材料技术有限公司 | Silicone high-density elastomer and production method thereof |
| CN108003620B (en) * | 2017-11-13 | 2021-09-21 | 杭州师范大学 | Bio-based foaming agent foaming silicone rubber material and preparation method thereof |
| BR112020018500B1 (en) * | 2018-03-13 | 2023-09-26 | Dow Global Technologies Llc | METHOD FOR PRODUCING A FLEXIBLE POLYURETHANE FOAM AND FLEXIBLE POLYURETHANE FOAM |
| US10941251B2 (en) * | 2018-03-22 | 2021-03-09 | Momentive Performance Materials Inc. | Silicone polymer and composition comprising the same |
| CN111792884A (en) * | 2020-06-28 | 2020-10-20 | 杭州佧斯家居设计有限公司 | Environment-friendly heat-insulating material for buildings and preparation method thereof |
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