CN110815849A - Preparation method of silica gel foaming sealing ring - Google Patents
Preparation method of silica gel foaming sealing ring Download PDFInfo
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- CN110815849A CN110815849A CN201810907083.0A CN201810907083A CN110815849A CN 110815849 A CN110815849 A CN 110815849A CN 201810907083 A CN201810907083 A CN 201810907083A CN 110815849 A CN110815849 A CN 110815849A
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- Prior art keywords
- silica gel
- sealing ring
- organic silica
- channel
- temperature
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Classifications
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- 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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
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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
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
- B29L2031/265—Packings, Gaskets
-
- 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
- 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
Abstract
The invention relates to the field of foaming materials, in particular to a preparation method of a silica gel foaming sealing ring. A preparation method of a silica gel foaming sealing ring comprises the following steps: respectively conveying the organic silica gel A containing the dimethyl silicone oil and the organic silica gel B containing the vinyl silicone oil to a channel A and a channel B of a dispenser; keeping the organic silica gel A and the organic silica gel B at constant temperature to the pretreatment working temperature for preparation before dispensing; setting dispensing parameters; starting a dispenser, extruding the organic silica gel A from the channel A, extruding the organic silica gel B from the channel B, uniformly mixing in a machine head, and dispensing along a preset track; and (3) curing, namely standing the organic silica gel sealing ring blank prepared in the last step for 1 min-12 h at the temperature of 10-50 ℃ for foaming, and forming a waterproof skin layer on the surface of the organic silica gel sealing ring blank. The invention can process in time according to the size of the required gasket without a die; the joint generated by a splicing method does not exist, so that the uniformity of the sealing ring is improved; the waterproof grade reaches IPX8 grade.
Description
Technical Field
The invention relates to the field of foaming materials, in particular to a preparation method of a silica gel foaming sealing ring.
Background
Silica gel integrates the characteristics of organic matters and the functions of inorganic matters due to the specific molecular structure of the silica gel. The foam material made by foaming silica gel is considered to be the most ideal material for sealing, buffering, shock insulation, flame retardance and insulation due to incomparable compression deformation resistance, excellent weather resistance, excellent performance stability at extreme temperature, excellent flame retardance, low smoke and low toxicity of flame during combustion and the like. At the earliest, the material is mainly used in the aspects of aerospace, and the application range of the material gradually expands various aspects of traffic, industrial production and life along with the improvement of requirements of safety, environmental protection and the like.
At present, the sealing ring is manufactured by applying a silica gel foaming material mainly by adopting the following three modes: stamping, molding and splicing. However, the stamping method causes a large amount of waste of material; the mold prepared by the mold pressing method has higher cost and can not be widely adapted according to different shapes, specifications and sizes; the splicing method is easy to generate seams, and the sealing performance of the sealing ring is poor due to the fact that the compression deformation of the seams is different from that of other places.
Disclosure of Invention
The invention aims to provide a preparation method of a silica gel foaming sealing ring, and the technical problems are solved.
In order to achieve the above purpose, the present invention adopts the following technical solutions to achieve the technical problems solved by the present invention:
a preparation method of a silica gel foaming sealing ring comprises the following steps:
s1, respectively conveying the organic silica gel A containing the dimethyl silicone oil and the organic silica gel B containing the vinyl silicone oil to a channel A and a channel B of the dispenser;
s2, keeping the organic silica gel A and the organic silica gel B at constant temperature to the pretreatment working temperature for preparation before dispensing;
s3, programming and controlling dispensing parameters according to the size of the sealing ring to be prepared; starting a dispenser, extruding the organic silica gel A from the channel A, extruding the organic silica gel B from the channel B, mixing at a machine head, extruding glue after uniform mixing, dispensing along a preset track to form an organic silica gel sealing ring blank;
s4, standing the organic silica gel sealing ring blank prepared in the previous step for 1 min-12 h at the temperature of 10-50 ℃ for foaming, and forming a waterproof skin layer on the surface of the organic silica gel sealing ring blank.
The step S2 is further described, the pretreatment working temperature is 5-35 ℃, and the pretreatment time is 30 min-3 h.
Further describing the step S3, the step further includes a mixing and stirring step, that is, a stirrer is disposed at the connection part of the channel a and the channel B with the handpiece, and the component a extruded from the channel a and the component B extruded from the channel B are mixed and stirred, and the stirring speed is controlled to be 100rpm to 5000 rpm.
Preferably, the stirring step is performed for 10s at 1000rpm and then for 5s at 2000 rpm.
Further describing the step S3, the parameter ranges for setting the dispensing process are as follows: the traveling speed is 0.1-30 m/min, the dispensing temperature is 5-50 ℃, and the glue-spitting amount of the machine head is 0.5-12 g/s.
Preferably, the walking speed is 0.5m/min-5m/min, the dispensing temperature is 15-35 ℃, and the glue-spitting amount is 0.5-4 g/s.
As further described above in step S5, the optimum temperature for curing is 15 to 35 ℃.
The width of a rubber line of the silica gel foaming sealing ring is 1 mm-30 mm, and the thickness of the rubber line is 0.5 mm-20 mm.
Preferably, the ratio of the width to the thickness of the glue line is 3: 1-1: 1.
Has the advantages that: due to the adoption of the technical scheme, the invention has the following technical effects:
1. the sealing ring can be processed in time according to the size of the required sealing ring without a die;
2. the surface of the sealing ring is provided with a waterproof skin layer;
3. the material is environment-friendly, does not need to be cut, and saves raw materials;
4. the joint generated by a splicing method does not exist, so that the uniformity of the sealing ring is improved;
5. the waterproof grade reaches IPX8 grade.
Drawings
FIG. 1 is a flow chart of the preparation process of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific drawings.
Fig. 1 shows a method for preparing a silica gel foamed sealing ring according to the present invention, which comprises:
s1: injecting raw materials;
s2: pre-treating;
s3: dispensing;
s4: and (5) curing.
The following examples are specific:
the embodiment I is a preparation method of a silica gel foaming sealing ring, which comprises the following steps:
s1, respectively conveying the organic silica gel A containing the dimethyl silicone oil and the organic silica gel B containing the vinyl silicone oil to a channel A and a channel B of a dispenser;
s2, setting the working temperature of pretreatment to be 10 ℃ and keeping for 3 hours;
s3, setting glue dispensing parameters, wherein the walking speed is 0.5m/min, the glue dispensing temperature is 15 ℃, and the glue discharging amount of a machine head is 0.5 g/S;
starting a dispenser, mixing the A, B two substances at the speed of 100rpm to fully mix the two components of the organic silica gel, and finishing the glue mixing process;
extruding the mixed organic silicon rubber from a machine head, and dispensing along a preset track to form an organic silicon sealing ring blank; s4, standing the organosilicon sealing ring blank prepared in the previous step for 12 hours at the temperature of 20 ℃ for foaming, and forming a waterproof skin layer on the surface of the organosilicon sealing ring blank, wherein the ratio of the width to the height of the formed glue line is 3: 1.
Embodiment two, a preparation method of a silica gel foaming sealing ring, comprising the following steps:
s1, respectively conveying the organic silica gel A containing the dimethyl silicone oil and the organic silica gel B containing the vinyl silicone oil to a channel A and a channel B of a dispenser;
s2, setting the working temperature of pretreatment at 35 ℃ and keeping the temperature for 30 min;
s3, setting glue dispensing parameters, wherein the walking speed is 5m/min, the glue dispensing temperature is 50 ℃, and the glue discharging amount of a machine head is 12 g/S; starting a dispenser, mixing A, B two substances at the speed of 5000rpm to fully mix the two components of the organic silica gel, and finishing a gel mixing process;
s4, extruding the mixed organic silicon adhesive from a machine head, and dispensing along a preset track to form an organic silicon sealing ring blank; and standing the organosilicon sealing ring blank prepared in the last step for 30min at the temperature of 25 ℃ for foaming, and forming a waterproof skin layer on the surface of the organosilicon sealing ring blank, wherein the ratio of the width to the height of the formed glue line is 1: 1.
In a third embodiment, a method for preparing a silica gel foamed seal ring includes the following steps:
s1, respectively conveying the organic silica gel A containing the dimethyl silicone oil and the organic silica gel B containing the vinyl silicone oil to a channel A and a channel B of a dispenser;
s2, setting the working temperature of the pretreatment to be 30 ℃ and keeping the working temperature for 1 h;
s3, setting glue dispensing parameters, wherein the walking speed is 1m/min, the glue dispensing temperature is 25 ℃, and the glue discharging amount of a machine head is 1 g/S; starting a dispenser, mixing the A, B two substances at the speed of 2000rpm to fully mix the two components of the organic silica gel, and finishing the glue mixing process; extruding the mixed organic silicon rubber from a machine head, and dispensing along a preset track to form an organic silicon sealing ring blank;
s4, standing the organosilicon sealing ring blank prepared in the previous step for 2 hours at 25 ℃ for foaming, and forming a waterproof skin layer on the surface of the organosilicon sealing ring blank, wherein the ratio of the width to the height of the formed glue line is 6: 5.
Embodiment four, a preparation method of a silica gel foaming sealing ring, comprising the following steps:
s1, respectively conveying the organic silica gel A containing the dimethyl silicone oil and the organic silica gel B containing the vinyl silicone oil to a channel A and a channel B of a dispenser;
s2, setting the working temperature of the pretreatment to be 30 ℃ and keeping the working temperature for 1 h;
s3, setting glue dispensing parameters, wherein the walking speed is 1m/min, the glue dispensing temperature is 25 ℃, and the glue discharging amount of a machine head is 1 g/S; starting a dispenser, stirring A, B two substances at the speed of 1000rpm for 10s, and then stirring at the speed of 2000rpm for 5s for mixing to fully mix the two components of the organic silica gel, thereby completing a glue mixing process; extruding the mixed organic silicon rubber from a machine head, and dispensing along a preset track to form an organic silicon sealing ring blank;
s4, standing the organic silicon sealing ring blank prepared in the previous step for 1h at the temperature of 25 ℃ for foaming, and forming a waterproof skin layer on the surface of the organic silicon sealing ring blank; the ratio of the width to the height of the glue line formed was 6: 5.
The following tests were performed on the silicone rubber foamed sealing rings prepared in the above four examples:
1. the silica gel foaming gasket is tested by a sponge density tester according to the method of GB/T1033, and the first embodiment is 0.70g/cm3Example two is 0.58g/cm3In the third embodiment, the concentration of the compound is 0.47g/cm3In the fourth example, the concentration was 0.36g/cm3。
2. The flame retardant performance of the silicone rubber foamed gaskets of the four embodiments is tested, the test method is to use a vertical combustion method in UL 94-2013 to test the flame retardant grade, and after the test, the flame retardant grades of the silicone rubber foamed sealing rings prepared in the three embodiments reach V-0 grade.
3. The prepared silica gel foaming sealing ring is subjected to compression deformation test by adopting the method B in GB/T6669-2008, and the test results are shown in Table 1.
TABLE 1
It can be seen from table 1 that the optimum compressive deformability can be obtained under the experimental conditions of example four, which indicates that the cell structure formed by mixing and foaming the silicone rubber a and the silicone rubber B is more desirable after the mixing and foaming are performed with variable speed stirring.
4. The silica gel foaming sealing rings prepared by the four embodiments are sealed on a device needing sealing, and a waterproof grade test is carried out, wherein the specific test contents are as follows:
(1) temperature shock test
The test was performed using a rapid temperature change box C7-480/15ESS, with reference to the test method in GBT31467.3-2015, 7.7.
The test sample is placed in an alternating temperature environment of (-40 +/-2) DEG C to (85 +/-2) DEG C, the conversion time of the two temperatures is within 0.5 hour, and each limit temperature is kept for 8 hours.
(2) Damp and heat cycle test
The test equipment is a constant temperature and humidity box with the model of KTHG-715TBS, and the humidity and heat cycle test is carried out by referring to a GB/T2423.4 test method, and the specific steps are shown in Table 2:
TABLE 2
Steps 1-5 are one cycle, for a total of 5 cycles.
(3) Salt spray test
Reference standard: GB/T31467.3-20157.8
The test steps are as follows:
① testing neutral salt spray, wherein the initial temperature is 15-35 ℃, and 5% saline water is added for 2 hours;
② putting the sample at-40 ℃ and 93% RH for 20-22 h;
③ repeating ①, ② cycles three times;
④ putting the mixture into a chamber with the temperature of 23 +/-2 ℃ and the humidity of 45-55% RH for 72 h.
(4) Salt water impact test
① the sample is kept in 55 ℃ environment for 15 min;
② immediately thereafter, the sample was immersed in cold saline at 0 ℃ at a concentration of 5% for 5 min.
(5) IPX8 test
After a series of tests such as high-low temperature impact test, temperature-humidity cycle test, salt spray test and the like, the sample is put into water with the depth of 2m and kept for 48 hours.
And (4) conclusion: the samples in the four embodiments have no water stain, which shows that the waterproof requirement of IPX8 grade can be achieved by using the silica gel foaming sealing rings in the invention.
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, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A preparation method of a silica gel foaming sealing ring is characterized by comprising the following steps:
s1, respectively conveying the organic silica gel A containing the dimethyl silicone oil and the organic silica gel B containing the vinyl silicone oil to a channel A and a channel B of the dispenser;
s2, keeping the organic silica gel A and the organic silica gel B at constant temperature to the pretreatment working temperature for preparation before dispensing;
s3, programming and controlling dispensing parameters according to the size of the sealing ring to be prepared; starting a dispenser, extruding the organic silica gel A from the channel A, extruding the organic silica gel B from the channel B, mixing at a machine head, extruding glue after uniform mixing, dispensing along a preset track to form an organic silica gel sealing ring blank;
s4, standing the organic silica gel sealing ring blank prepared in the previous step for 1 min-12 h at the temperature of 10-50 ℃ for foaming, and forming a waterproof skin layer on the surface of the organic silica gel sealing ring blank.
2. The method for preparing the silica gel foaming sealing ring according to claim 1, wherein in the step S2, the pretreatment working temperature is 5-35 ℃, and the pretreatment time is 30 min-3 h.
3. The method for preparing a silicone rubber foaming sealing ring according to claim 1, wherein in step S3, the setting range of dispensing parameters is as follows: the traveling speed is 0.1-30 m/min, the dispensing temperature is 5-50 ℃, and the glue-spitting amount of the machine head is 0.5-12 g/s.
4. The method for preparing a silica gel foamed seal ring according to claim 3, wherein the traveling speed is 0.5m/min to 5m/min, the dispensing temperature is 15 ℃ to 35 ℃, and the amount of dispensed glue is 0.5g/s to 4 g/s.
5. The method for preparing a silicone rubber foamed seal ring according to claim 1, further comprising a mixing and stirring step in step S3, wherein a stirrer is provided at a portion where the channel a and the channel B are connected to the head, and the silicone rubber a extruded from the channel a and the silicone rubber B extruded from the channel B are mixed and stirred at a stirring speed of 100rpm to 5000 rpm.
6. The method for preparing a silica gel foamed sealing ring according to claim 5, wherein the stirring step is to stir at 1000rpm for 10s and then at 2000rpm for 5 s.
7. The method for preparing a silica gel foamed sealing ring according to claim 1, wherein in the step S4, the curing temperature is 15 ℃ to 35 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810907083.0A CN110815849A (en) | 2018-08-10 | 2018-08-10 | Preparation method of silica gel foaming sealing ring |
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| CN201810907083.0A CN110815849A (en) | 2018-08-10 | 2018-08-10 | Preparation method of silica gel foaming sealing ring |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103265813A (en) * | 2013-05-30 | 2013-08-28 | 成都拓利化工实业有限公司 | Foaming type encapsulating silica gel composition |
| CN103362913A (en) * | 2013-07-22 | 2013-10-23 | 格林精密部件（惠州）有限公司 | Dispensing technology |
| CN104710964A (en) * | 2013-12-11 | 2015-06-17 | 佛山市新翔星化工有限公司 | LED packaged silica gel and preparation method thereof |
| CN106938515A (en) * | 2017-05-02 | 2017-07-11 | 薛志勇 | A kind of forming method of foamed silica gel |
-
2018
- 2018-08-10 CN CN201810907083.0A patent/CN110815849A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103265813A (en) * | 2013-05-30 | 2013-08-28 | 成都拓利化工实业有限公司 | Foaming type encapsulating silica gel composition |
| CN103362913A (en) * | 2013-07-22 | 2013-10-23 | 格林精密部件（惠州）有限公司 | Dispensing technology |
| CN104710964A (en) * | 2013-12-11 | 2015-06-17 | 佛山市新翔星化工有限公司 | LED packaged silica gel and preparation method thereof |
| CN106938515A (en) * | 2017-05-02 | 2017-07-11 | 薛志勇 | A kind of forming method of foamed silica gel |
Non-Patent Citations (1)
| Title |
|---|
| 李永海: "《面包制作技术问答》", 31 December 1988, 中国食品出版社 * |
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