CN110606972A - Manufacturing process of conductive foam - Google Patents
Manufacturing process of conductive foam Download PDFInfo
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- CN110606972A CN110606972A CN201910928607.9A CN201910928607A CN110606972A CN 110606972 A CN110606972 A CN 110606972A CN 201910928607 A CN201910928607 A CN 201910928607A CN 110606972 A CN110606972 A CN 110606972A
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
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- 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
- C08J9/08—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 carbon dioxide
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- 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
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- 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
- C08J9/107—Nitroso compounds
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- C—CHEMISTRY; METALLURGY
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- 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
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- 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
- C08J2483/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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Abstract
The invention discloses a manufacturing process of conductive foam, which comprises the following steps: s100: stirring 36-73 parts of prepared liquid silica gel, 18-32 parts of methyl vinyl silicone rubber, 5-9 parts of ferric oxide, 25-33 parts of foaming agent, 8-15 parts of foaming auxiliary agent, 5-8 parts of vulcanizing agent, 3-5 parts of reinforcing agent and 10-13 parts of flame retardant to obtain flame-retardant high-temperature resistant vulcanized silica gel; s200: extruding and molding the silica gel by a silica gel extruder to obtain a silica gel core; s300: drawing the formed silica gel core into a dryer for drying; s400: wrapping the dried outer side wall of the silica gel core with a PET film or PI film plated with conductive metal to obtain conductive foam; s500: cutting the conductive foam by a cutting machine according to the standard size; s600: and carrying out carrier tape packaging on the cut conductive foam. According to the invention, the flame-retardant high-temperature-resistant vulcanized silica gel is obtained by mutually stirring the materials, so that the moisture resistance, the tearing strength, the hardness and the processing performance of the silica gel are improved.
Description
Technical Field
The invention relates to a manufacturing process, in particular to a manufacturing process of conductive foam.
Background
In the present society, electronic products become a necessity, but a circuit board can emit electromagnetic interference and electromagnetic wave radiation in the working process of the electronic products, and the conductive foam has a good shielding effect, and the conductive foam is formed by wrapping conductive cloth on a flame-retardant material and then processing the conductive cloth to ensure that the surface of the conductive foam has good surface conductivity.
Chinese patent "201811620085.8" discloses that a resin composition is mainly composed of a base resin a, a base resin B, a crosslinking agent, a reinforcing agent, a flame retardant, an anti-aging agent, a catalyst and an inhibitor, and conductive powder is used as an auxiliary, and there is no by-product in the curing process, which does not pollute the environment, but still has poor moisture resistance, low tear strength and hardness, and deformation and poor processability due to low hardness.
Disclosure of Invention
The invention aims to provide a manufacturing process of conductive foam, which can effectively solve the technical problems.
In order to achieve the purpose of the invention, the following technical scheme is adopted: a manufacturing process of conductive foam comprises the following steps:
s100: stirring 36-73 parts of prepared liquid silica gel, 18-32 parts of methyl vinyl silicone rubber, 5-9 parts of ferric oxide, 25-33 parts of foaming agent, 8-15 parts of foaming auxiliary agent, 5-8 parts of vulcanizing agent, 3-5 parts of reinforcing agent and 10-13 parts of flame retardant to obtain flame-retardant high-temperature resistant vulcanized silica gel;
s200: extruding and molding the silica gel by a silica gel extruder to obtain a silica gel core;
s300: drawing the formed silica gel core into a dryer for drying;
s400: wrapping the dried outer side wall of the silica gel core with a PET film or PI film plated with conductive metal to obtain conductive foam;
s500: cutting the conductive foam by a cutting machine according to the standard size;
s600: and carrying out carrier tape packaging on the cut conductive foam.
Preferably, the S100 step includes:
s101: heating 36-73 parts of prepared liquid silica gel, 18-32 parts of methyl vinyl silicone rubber and 5-9 parts of ferric oxide to 80-140 ℃, and stirring for 25-35 minutes to obtain a silica gel mixture;
s102: controlling the temperature of the silica gel mixture at 100-120 ℃, adding 25-33 parts of foaming agent and 8-15 parts of foaming auxiliary agent again, and stirring for 10-15 minutes to obtain a foamed silica gel mixture;
s103: adding 5-8 parts of vulcanizing agent and 8-12 parts of reinforcing agent into the stirred foamed silica gel mixture, and stirring for 10-13 minutes to obtain vulcanized silica gel;
s104: and adding 10-13 parts of flame retardant into the stirred vulcanized silica gel, and stirring for 15-20 minutes to obtain the flame-retardant high-temperature-resistant vulcanized silica gel.
Preferably, the drying time in S300 is 3-5 minutes, and the drying temperature is 45-65 ℃.
Preferably, the conductive metal-plated PET film or P I film in S400 is connected to the silicone core through a silicone adhesive.
Preferably, the foaming agent adopts one or more of nitroso, disulfonyl hydrazide benzene and carbon black; the foaming auxiliary agent is one or more of stearic acid, alum and phthalic acid; the vulcanizing agent is one or more of sulfur, sulfur monochloride and benzoyl peroxide; the reinforcing agent adopts silicon dioxide; the flame retardant adopts one or two of antimony trioxide and aluminum hydroxide.
Preferably, the stirring speed is 100-220 r/min.
Compared with the prior art, the invention has the following beneficial effects:
1. liquid silica gel, methyl vinyl silicone rubber and ferric trioxide are used as main raw materials, and the liquid silica gel has good tear strength, good thermal stability, good water resistance and air permeability, and good rebound resilience and thermal aging resistance. The methyl vinyl silicone rubber has better thermal stability, moisture resistance, aging resistance and electric arc resistance. Ferric trioxide improves the heat resistance of silica gel by inhibiting oxidative degradation of the polysiloxane side chains.
2. The foaming agent decomposes carbon dioxide and nitrogen gas by heating and forms fine pores in the silica gel, thereby increasing the aging resistance, heat resistance, acid and alkali resistance, and flame retardant coefficient of the silica gel, and the foaming aid increases the decomposition temperature and decomposition rate, and improves the uniformity of foam.
3. The vulcanizing agent improves the tensile strength, elasticity, tear resistance and tensile strength of the rubber. The reinforcing agent reduces the silica gel cost, improves the flame retardance and improves the processing performance. The flame retardant improves the thermal stability of the silica gel and the flame retardant coefficient.
In conclusion, the flame-retardant high-temperature-resistant vulcanized silica gel is obtained after the materials are mutually stirred, and the moisture resistance, the tearing strength, the hardness and the processing performance of the silica gel are improved.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1:
a manufacturing process of conductive foam comprises the following steps:
s101: heating 36 parts of prepared liquid silica gel, 18 parts of methyl vinyl silicone rubber and 5 parts of ferric oxide to 80 ℃, adding into a stirrer with the stirring speed of 100r/min, and stirring for 25 minutes to obtain a silica gel mixture;
s102: controlling the temperature of the silica gel mixture at 100 ℃, adding 25 parts of nitroso and 8 parts of stearic acid again, adding into a stirrer with the stirring speed of 100r/min, and stirring for 10 minutes to obtain a foamed silica gel mixture;
s103: controlling the temperature of the stirred foamed silica gel mixture at 100 ℃, adding 5 parts of sulfur and 8 parts of silicon dioxide again, stirring in a stirrer at the stirring speed of 100r/min for 10 minutes, and stirring to obtain silicon sulfide;
s104: and controlling the temperature of the stirred silica gel sulfide at 200 ℃, adding 10 parts of antimony trioxide again to the stirring speed of 100r/min, and stirring for 15 minutes in the stirrer to obtain the flame-retardant high-temperature-resistant silica gel sulfide.
S200: extruding and molding the silica gel by a silica gel extruder to obtain a silica gel core;
s300: drawing the formed silica gel core into a dryer with the temperature of 45 ℃ for drying for 3 minutes;
s400: connecting the outer side wall of the dried silica gel core with a conductive metal plated PET film through a silica gel connecting agent to obtain conductive foam;
s500: cutting the conductive foam by a cutting machine according to the standard size;
s600: and carrying out carrier tape packaging on the cut conductive foam.
Example 2:
a manufacturing process of conductive foam comprises the following steps:
s101: heating 36 parts of prepared liquid silica gel, 18 parts of methyl vinyl silicone rubber and 5 parts of ferric oxide to 80 ℃, adding into a stirrer with the stirring speed of 100r/min, and stirring for 25 minutes to obtain a silica gel mixture;
s102: controlling the temperature of the silica gel mixture at 100 ℃, adding 25 parts of disulfonyl hydrazide benzene and 8 parts of alum, and adding the mixture into a stirrer with the stirring speed of 100r/min to stir for 10 minutes to obtain a foamed silica gel mixture;
s103: controlling the temperature of the stirred foamed silica gel mixture at 100 ℃, adding 5 parts of sulfur monochloride and 12 parts of silicon dioxide again, stirring in a stirrer at the stirring speed of 100r/min for 10 minutes to obtain vulcanized silica gel;
s104: and controlling the temperature of the stirred silica gel to be 200 ℃, adding 10 parts of aluminum hydroxide again to the stirrer with the stirring speed of 100r/min, and stirring for 15 minutes to obtain the flame-retardant high-temperature-resistant silica gel.
S200: extruding and molding the silica gel by a silica gel extruder to obtain a silica gel core;
s300: drawing the formed silica gel core into a dryer with the temperature of 45 ℃ for drying for 3 minutes;
s400: connecting the outer side wall of the dried silica gel core with a PI film plated with conductive metal through a silica gel connecting agent to obtain conductive foam;
s500: cutting the conductive foam by a cutting machine according to the standard size;
s600: and carrying out carrier tape packaging on the cut conductive foam.
Example 3:
a manufacturing process of conductive foam comprises the following steps:
s101: heating 50 parts of prepared liquid silica gel, 23 parts of methyl vinyl silicone rubber and 6 parts of ferric oxide to 90 ℃, adding into a stirrer with the stirring speed of 140r/min, and stirring for 30 minutes to obtain a silica gel mixture;
s102: controlling the temperature of the silica gel mixture at 110 ℃, adding 26 parts of nitroso, 27 parts of carbon black, 10 parts of stearic acid and 12 parts of alum, adding into a stirrer with the stirring speed of 140r/min, and stirring for 12 minutes to obtain a foamed silica gel mixture;
s103: controlling the temperature of the stirred foamed silica gel mixture at 110 ℃, adding 6 parts of sulfur, 7 parts of sulfur monochloride and 10 parts of silicon dioxide again, stirring in a stirrer at the stirring speed of 140r/min for 11 minutes to obtain the silica sulfide;
s104: and controlling the temperature of the stirred silica gel sulfide at 230 ℃, adding 11 parts of antimony trioxide and 11 parts of aluminum hydroxide again to the stirring speed of 140r/min, and stirring for 17 minutes in a stirrer to obtain the flame-retardant high-temperature-resistant silica gel sulfide.
S200: extruding and molding the silica gel by a silica gel extruder to obtain a silica gel core;
s300: drawing the formed silica gel core into a dryer with the temperature of 50 ℃ for drying for 4 minutes;
s400: connecting the outer side wall of the dried silica gel core with a conductive metal plated PET film through a silica gel connecting agent to obtain conductive foam;
s500: cutting the conductive foam by a cutting machine according to the standard size;
s600: and carrying out carrier tape packaging on the cut conductive foam.
Example 4:
s101: heating 73 parts of prepared liquid silica gel, 32 parts of methyl vinyl silicone rubber and 9 parts of ferric oxide to 140 ℃, adding into a stirrer with the stirring speed of 220r/min, and stirring for 35 minutes to obtain a silica gel mixture;
s102: controlling the temperature of the silica gel mixture at 120 ℃, adding 33 parts of carbon black and 15 parts of phthalic acid again, adding into a stirrer with the stirring speed of 220r/min, and stirring for 15 minutes to obtain a foamed silica gel mixture;
s103: controlling the temperature of the stirred foamed silica gel mixture at 120 ℃, adding 8 parts of benzoyl peroxide and 12 parts of silicon dioxide again, stirring in a stirrer at the stirring speed of 220r/min for 13 minutes to obtain vulcanized silica gel;
s104: and controlling the temperature of the stirred silica gel to be 250 ℃, adding 13 parts of aluminum hydroxide again to the stirrer with the stirring speed of 220r/min, and stirring for 20 minutes to obtain the flame-retardant high-temperature-resistant silica gel.
S200: extruding and molding the silica gel by a silica gel extruder to obtain a silica gel core;
s300: drawing the formed silica gel core into a dryer with the temperature of 65 ℃ for drying for 5 minutes;
s400: connecting the outer side wall of the dried silica gel core with a PI film plated with conductive metal through a silica gel connecting agent to obtain conductive foam;
s500: cutting the conductive foam by a cutting machine according to the standard size;
s600: and carrying out carrier tape packaging on the cut conductive foam.
Experiment of
The results of testing the quality test data of all types of the conductive foam of the above examples 1 to 5 show that the conductive foam provided by the method of the present invention can improve the moisture resistance, tear strength, hardness and processability of the cellar, and the test results of the examples 1 to 5 are listed below for a brief description.
Comparing the above test data, it can be seen that the conductive foams of examples 1-5 have lower surface resistivity and vertical resistivity than the comparative examples, and the conductive effect is better. The fire rating was higher than that of the comparative example. The hardness is higher than that of the comparative example, the later-stage processing performance is improved, and the compression permanent deformation is the same as that of the comparative example. The tearing strength is higher than that of the comparative example, and the deformation caused by displacement in the working process is reduced. The heat resistance and the cold and hot impact test effect are good.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
Claims (6)
1. A manufacturing process of conductive foam is characterized by comprising the following steps:
s100: stirring 36-73 parts of prepared liquid silica gel, 18-32 parts of methyl vinyl silicone rubber, 5-9 parts of ferric oxide, 25-33 parts of foaming agent, 8-15 parts of foaming auxiliary agent, 5-8 parts of vulcanizing agent, 3-5 parts of reinforcing agent and 10-13 parts of flame retardant to obtain flame-retardant high-temperature resistant vulcanized silica gel;
s200: extruding and molding the silica gel by a silica gel extruder to obtain a silica gel core;
s300: drawing the formed silica gel core into a dryer for drying;
s400: wrapping the dried outer side wall of the silica gel core with a PET film or PI film plated with conductive metal to obtain conductive foam;
s500: cutting the conductive foam by a cutting machine according to the standard size;
s600: and carrying out carrier tape packaging on the cut conductive foam.
2. The manufacturing process of the conductive foam of claim 1, wherein the step S100 comprises:
s101: heating 36-73 parts of prepared liquid silica gel, 18-32 parts of methyl vinyl silicone rubber and 5-9 parts of ferric oxide to 80-140 ℃, and stirring for 25-35 minutes to obtain a silica gel mixture;
s102: controlling the temperature of the silica gel mixture at 100-120 ℃, adding 25-33 parts of foaming agent and 8-15 parts of foaming auxiliary agent again, and stirring for 10-15 minutes to obtain a foamed silica gel mixture;
s103: adding 5-8 parts of vulcanizing agent and 8-12 parts of reinforcing agent into the stirred foamed silica gel mixture, and stirring for 10-13 minutes to obtain vulcanized silica gel;
s104: and adding 10-13 parts of flame retardant into the stirred vulcanized silica gel, and stirring for 15-20 minutes to obtain the flame-retardant high-temperature-resistant vulcanized silica gel.
3. The manufacturing process of the conductive foam as claimed in claim 1, wherein the drying time in the step S300 is 3-5 minutes, and the drying temperature is 45-65 ℃.
4. The manufacturing process of the conductive foam as claimed in claim 1, wherein the conductive metal plated PET film or PI film in S400 is connected with the silica gel core through a silica gel connecting agent.
5. The manufacturing process of the conductive foam as claimed in claim 1, wherein the foaming agent is one or more of nitroso, disulfonyl hydrazide benzene and carbon black; the foaming auxiliary agent is one or more of stearic acid, alum and phthalic acid; the vulcanizing agent is one or more of sulfur, sulfur monochloride and benzoyl peroxide; the reinforcing agent adopts silicon dioxide; the flame retardant adopts one or two of antimony trioxide and aluminum hydroxide.
6. The process for manufacturing conductive foam as claimed in claim 1, wherein the stirring speed is 100-220 r/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910928607.9A CN110606972A (en) | 2019-09-28 | 2019-09-28 | Manufacturing process of conductive foam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910928607.9A CN110606972A (en) | 2019-09-28 | 2019-09-28 | Manufacturing process of conductive foam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111452376A (en) * | 2020-04-27 | 2020-07-28 | 深圳市信维通信股份有限公司 | Manufacturing process of conductive foam |
| CN117460241A (en) * | 2023-11-30 | 2024-01-26 | 苏州万合电子有限公司 | Conductive silica gel foam and manufacturing process thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417260A (en) * | 2002-12-04 | 2003-05-14 | 刘淑芬 | Solid silica gel |
| CN101410457A (en) * | 2006-03-31 | 2009-04-15 | 陶氏康宁东丽株式会社 | Heat-curable silicone rubber composition and a cured body thereof |
| CN103313585A (en) * | 2013-05-24 | 2013-09-18 | 深圳市鸿富诚屏蔽材料有限公司 | Conductive foam and preparation method thereof |
| CN109679352A (en) * | 2018-12-28 | 2019-04-26 | 深圳德邦界面材料有限公司 | A kind of conducting foam and preparation method thereof |
-
2019
- 2019-09-28 CN CN201910928607.9A patent/CN110606972A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1417260A (en) * | 2002-12-04 | 2003-05-14 | 刘淑芬 | Solid silica gel |
| CN101410457A (en) * | 2006-03-31 | 2009-04-15 | 陶氏康宁东丽株式会社 | Heat-curable silicone rubber composition and a cured body thereof |
| CN103313585A (en) * | 2013-05-24 | 2013-09-18 | 深圳市鸿富诚屏蔽材料有限公司 | Conductive foam and preparation method thereof |
| CN109679352A (en) * | 2018-12-28 | 2019-04-26 | 深圳德邦界面材料有限公司 | A kind of conducting foam and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111452376A (en) * | 2020-04-27 | 2020-07-28 | 深圳市信维通信股份有限公司 | Manufacturing process of conductive foam |
| CN117460241A (en) * | 2023-11-30 | 2024-01-26 | 苏州万合电子有限公司 | Conductive silica gel foam and manufacturing process thereof |
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Application publication date: 20191224 |