CN111251526B - Liquid silica gel forming method - Google Patents
Liquid silica gel forming method Download PDFInfo
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- CN111251526B CN111251526B CN202010053197.0A CN202010053197A CN111251526B CN 111251526 B CN111251526 B CN 111251526B CN 202010053197 A CN202010053197 A CN 202010053197A CN 111251526 B CN111251526 B CN 111251526B
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- silica gel
- component
- liquid silica
- forming
- double
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0001—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor characterised by the choice of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2083/00—Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
- B29K2083/005—LSR, i.e. liquid silicone rubbers, or derivatives thereof
Abstract
The invention provides a liquid silica gel forming method, which comprises the following steps: mixing the component A and the component B into double-combination liquid silica gel, wherein the weight ratio of the component A to the component B is 1:0.90% -1: within 1.50%; injecting the double-combination liquid silica gel into a forming mould, and vacuumizing to fill the cavity of the forming mould with the double-combination liquid silica gel; and taking down the forming die, statically placing for a preset time, and then opening the die to obtain a formed product. The invention is characterized in that the weight ratio of the component A to the component B is 1:0.90% -1: the vacuum pumping mode after the double-combined liquid silica gel within 1.50 percent is injected into the forming mould can realize the forming processing of the silica gel within the temperature range of 0-60 ℃, can cover the silica gel on the surface of a product which does not resist the temperature at a lower temperature, and widens the application range of the silica gel.
Description
Technical Field
The invention belongs to the technical field of silica gel forming, and particularly relates to a liquid silica gel forming method.
Background
Modern medical equipment, certain electronic wearable products and the like are applied to silica gel materials in large quantities, the melting point temperature of silica gel is about 230 ℃, certain sensitive electronic components have high requirements on the ambient temperature, for example, the high temperature resistance limit of a battery is only 90 ℃, the service life time limit of the product is greatly shortened due to the high temperature, potential quality risks exist in the product, and the application range of the silica gel in the products with high requirements on the ambient temperature is greatly limited due to the high forming temperature.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a liquid silica gel forming method, which can realize the forming processing of silica gel within the temperature range of 0-60 ℃, thereby widening the application range of silica gel.
In order to solve the technical problem, the invention provides a liquid silica gel forming method, which comprises the following steps:
the method comprises the following steps: mixing a component A and a component B into a double-combined liquid silica gel, wherein the weight ratio of the component A to the component B is 1:0.90% -1: within 1.50%;
step two: injecting the double-combination liquid silica gel into a forming mold, and vacuumizing to fill the cavity of the forming mold with the double-combination liquid silica gel;
step three: and taking down the forming die, statically placing for a preset time, and then opening the die to obtain a formed product.
Further, injecting the double-combination liquid silica gel into a molding die and then vacuumizing the molding die comprises:
injecting the double-combination liquid silica gel to one end of a single-face clamp of the forming mold by using a gel injection machine, and then vacuumizing; and injecting the double-combination liquid silica gel to one end of the other side clamp of the forming mould by using a glue injection machine, and then vacuumizing.
Further, the process of vacuumizing is realized by adopting a multi-layer laminating mode.
Further, the component A comprises organic liquid silica gel and a cross-linking agent, and the component B comprises a catalyst.
Further, the organic liquid silicone gel comprises vinyl polysiloxane and polyether polyol, and the cross-linking agent comprises at least one of methyl hydrogen polysiloxane, methyl phenyl hydrogen polysiloxane, methyl hydrogen silicone resin and phenyl hydrogen silicone resin.
Further, the catalyst comprises a compound containing platinum, and the platinum content of the catalyst is 1.2-3.5%
Further, the weight ratio of the A component to the B component is 1:1.15% -1: within 1.35 percent.
Further, the weight ratio of the component A to the component B is in the range of 1:1.20% -1: within 1.30 percent.
Compared with the prior art, the liquid silica gel forming method has the beneficial effects that:
the invention is characterized in that the weight ratio of the component A to the component B is 1:0.90% -1: the method of vacuumizing within 1.50 percent of double-combined liquid silica gel after being injected into a forming die can realize the forming processing of the silica gel within the temperature range of 0-60 ℃, can cover the silica gel on the surface of a product which does not resist temperature at a lower temperature, and widens the application range of the silica gel.
Drawings
FIG. 1 is a schematic flow chart of a method for forming liquid silica gel according to an embodiment of the present invention;
fig. 2 is a schematic sub-flow diagram of step two of the liquid silicone gel molding method in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment is as follows:
in this embodiment, as shown in fig. 1-2, a method for forming a liquid silicone rubber is provided, which includes the following steps:
s1: mixing a component A and a component B into a double-combined liquid silica gel, wherein the weight ratio of the component A to the component B is 1:0.90% -1: within 1.50%;
s2: injecting the double-combination liquid silica gel into a forming mold, and vacuumizing to fill the cavity of the forming mold with the double-combination liquid silica gel;
s3: and taking down the forming die, statically placing for a preset time, and then opening the die to obtain a formed product.
The invention is characterized in that the weight ratio of the component A to the component B is 1:0.90% -1: the method of vacuumizing within 1.50 percent of double-combined liquid silica gel after being injected into a forming die can realize the forming processing of the silica gel within the temperature range of 0-60 ℃, can cover the silica gel on the surface of a product which does not resist temperature at a lower temperature, and widens the application range of the silica gel.
Further, the step of injecting the double-combination liquid silicone rubber into a molding die and then vacuumizing comprises the following steps:
s201, injecting the double-combination liquid silica gel to one end of a single-face clamp of the forming mold by using a glue injection machine, and vacuumizing; s202, injecting the double-combination liquid silica gel to one end of the other side clamp of the forming mold by using a glue injection machine, and then vacuumizing.
Further, the process of vacuumizing is realized by adopting a multi-layer laminating mode. The specific lamination layer number is determined by the height of the product, the vacuumizing time is also determined by the size of the product, and the product with the normal glue dosage of about 10 kilograms can be vacuumized for about 3 minutes.
Further, the component A comprises organic liquid silica gel and a cross-linking agent, and the component B comprises a catalyst.
Further, the organic liquid silicone gel comprises vinyl polysiloxane and polyether polyol, and the cross-linking agent comprises at least one of methyl hydrogen-containing polysiloxane, methyl phenyl hydrogen-containing polysiloxane, methyl hydrogen-containing silicone resin and phenyl hydrogen-containing silicone resin.
Further, the catalyst comprises a compound containing platinum, and the platinum content of the catalyst is 1.2-3.5%
Further, the weight ratio of the A component to the B component is 1:1.15% -1: within 1.35 percent. Further, the weight ratio of the A component to the B component is 1:1.20% -1: within 1.30 percent. In this example, the weight ratio of the a component to the B component was in the range of 1:1.00%, standing statically for 75 minutes to solidify the silica gel at 0 ℃ after the vacuum pumping is finished, standing statically for 60 minutes to solidify the silica gel at 40 ℃ after the vacuum pumping is finished, and standing statically for 40 minutes to solidify the silica gel at 60 ℃; the weight ratio of the component A to the component B is 1:1.30 percent, can be statically placed for 60 minutes to solidify the silica gel after the vacuum pumping is finished under the condition of 0 ℃, can be statically placed for 45 minutes to solidify the silica gel after the vacuum pumping is finished under the condition of 40 ℃, and can be statically placed for 30 minutes to solidify the silica gel after the vacuum pumping is finished under the condition of 60 ℃. The specific proportion and temperature can be adjusted according to actual conditions, for example, the weight ratio of the component A to the component B can be 1:0.95%, 1:0.98%, 1:1.01%, 1:1.03%, 1:1.08%, 1:1.13%, 1:1.15%, 1:1.18%, 1:1.20%, 1:1.23%, 1:1.25%, 1:1.8%, 1:1.33%, etc., under the temperature conditions of 10 deg.C, 15 deg.C, 20 deg.C, 25 deg.C, 30 deg.C, 35 deg.C, 45 deg.C, 50 deg.C, 55 deg.C, etc.
The process is applied to certain wearable medical equipment at present, the silica gel can completely wrap various exposed lithium batteries, electronic component products such as IC and the like, meanwhile, the silica gel surface can also be directly contacted with the skin of a human body, and through GB/T16886 standard biocompatibility test, the formed liquid silica gel cannot generate any anaphylactic reaction on the human body. The injection temperature of the silica gel piece is 0 ℃ for molding; the vacuum pumping step is carried out on the injected liquid silica gel, so that no bubbles exist on the surface of the gel layer, no defect exists, poor molding is realized, and the base material is not deformed and damaged; the process is applied to floor tile decorative lamp products, the battery is used as a power supply of the LED lamp, the solar panel of the floor tile is used for charging the battery, the floor tile can be recycled for at least 2 hours every day, the transparent silica gel part can be directly poured and wrapped to protect electronic components such as the LED lamp and the battery,
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A method for forming liquid silica gel is characterized by comprising the following steps:
the method comprises the following steps: mixing a component A and a component B into a double-combined liquid silica gel, wherein the weight ratio of the component A to the component B is 1:0.90% -1: within 1.50%; the component A comprises organic liquid silica gel and a cross-linking agent, the component B comprises a catalyst, the organic liquid silica gel comprises vinyl polysiloxane and polyether polyol, and the cross-linking agent comprises at least one of methyl hydrogen-containing polysiloxane, methyl phenyl hydrogen-containing polysiloxane, methyl hydrogen-containing silicone resin and phenyl hydrogen-containing silicone resin;
step two: injecting the double-combination liquid silica gel to one end of a single-face clamp of a forming mould by using a glue injection machine, vacuumizing, injecting the double-combination liquid silica gel to one end of the other side clamp of the forming mould by using the glue injection machine, vacuumizing, and filling the cavity of the forming mould with the double-combination liquid silica gel in a multilayer lamination manner;
step three: taking down the forming die, statically placing for a preset time, and then opening the die to obtain a formed product;
the liquid silica gel forming method can realize the forming processing of the silica gel within the temperature range of 0-60 ℃.
2. The method according to claim 1, wherein the catalyst comprises a platinum-containing compound, and the platinum content of the catalyst is 1.2-3.5%; the weight ratio of the component A to the component B is 1:1.15% -1: within 1.35 percent.
3. The method for molding liquid silicone rubber according to claim 2, wherein the weight ratio of the component A to the component B is in the range of 1:1.20% -1: within 1.30 percent.
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| CN102983250A (en) * | 2012-12-20 | 2013-03-20 | 杭州纳晶科技有限公司 | Silica gel lens, fabrication method of silica gel lens and LED light emitting device comprising silica gel lens |
| CN106142414A (en) * | 2016-07-29 | 2016-11-23 | 柳州快速制造工程技术有限公司 | A kind of method utilizing silica gel mould manufactured parts |
| CN108215061A (en) * | 2018-04-12 | 2018-06-29 | 中山弗雷德机械有限公司 | A kind of mould process for making silica gel part |
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| CN101407635B (en) * | 2008-11-14 | 2011-04-06 | 成都硅宝科技股份有限公司 | Addition type heat conducting silicon rubber and manufacturing method thereof |
| CN103013123B (en) * | 2012-12-31 | 2014-10-29 | 成都拓利化工实业有限公司 | Two-component silica gel and preparation method thereof |
| CN103131190B (en) * | 2013-02-05 | 2015-07-01 | 广州市爱易迪新材料科技有限公司 | Double-component self-molding lens silica gel for light-emitting diode (LED) package and package process of double-component self-molding lens silica gel |
| CN104626457A (en) * | 2014-12-31 | 2015-05-20 | 东莞市九瀛新材料有限公司 | Silicon rubber injection molding method of container outer surface |
| CN107657880A (en) * | 2016-07-26 | 2018-02-02 | 上海光韵达数字医疗科技有限公司 | A kind of manufacturing process of human organ model |
| CN108424652B (en) * | 2018-04-16 | 2020-10-02 | 吉林大学 | Addition type silica gel and preparation method and application thereof |
| CN110511550B (en) * | 2018-05-21 | 2022-02-22 | 高新特殊工程塑料全球技术有限公司 | Polycarbonate composition, molded article comprising the same, and method for producing the article |
| CN109177028A (en) * | 2018-08-28 | 2019-01-11 | 大连交通大学 | Liquid-state silicon gel is prepared and injection molding forming method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983250A (en) * | 2012-12-20 | 2013-03-20 | 杭州纳晶科技有限公司 | Silica gel lens, fabrication method of silica gel lens and LED light emitting device comprising silica gel lens |
| CN106142414A (en) * | 2016-07-29 | 2016-11-23 | 柳州快速制造工程技术有限公司 | A kind of method utilizing silica gel mould manufactured parts |
| CN108215061A (en) * | 2018-04-12 | 2018-06-29 | 中山弗雷德机械有限公司 | A kind of mould process for making silica gel part |
| CN109263330A (en) * | 2018-09-04 | 2019-01-25 | 东莞市林知海新材料科技有限公司 | A kind of thermal transfer printable mold silica gel transfer target preparation method |
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