CN109532039B - Forming process for wrapping teflon film outside silica gel sealing element - Google Patents

Forming process for wrapping teflon film outside silica gel sealing element Download PDF

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Publication number
CN109532039B
CN109532039B CN201910029170.5A CN201910029170A CN109532039B CN 109532039 B CN109532039 B CN 109532039B CN 201910029170 A CN201910029170 A CN 201910029170A CN 109532039 B CN109532039 B CN 109532039B
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Prior art keywords
teflon film
silica gel
teflon
template frame
mold
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CN201910029170.5A
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CN109532039A (en
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唐洪宽
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Dongguan Good Impression Industrial Co ltd
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Dongguan Good Impression Industrial Co ltd
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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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • B29C65/4835—Heat curing adhesives
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/026—Chemical pre-treatments
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Thermal Sciences (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Sealing Material Composition (AREA)

Abstract

The invention discloses a molding process of a teflon film wrapped outside a silica gel sealing element, which comprises the following steps of carrying out sodium treatment on one surface of the teflon film to be used as an adhesive surface; uniformly coating bonding glue on the bonding surface of the Teflon film; after the bonding glue on the bonding surface of the Teflon film is preliminarily solidified, baking the Teflon film, and cooling; flatly paving a teflon film on a template frame, wherein the template frame is provided with a placing station corresponding to each cavity of a mold, placing a silica gel raw material on an adhesive surface of the teflon film based on the shape of a product, and the position of the silica gel raw material on the teflon film corresponds to the placing station of the template frame; and taking the teflon film off the template frame to carry the silica gel raw material to be placed in a mold of a vulcanizing machine for vulcanization molding to generate the silica gel sealing piece. The application wraps the Teflon film outside the silica gel raw material, so that the sealing performance of the silica gel sealing element is good, the characteristics of the Teflon film can be achieved, and the application scene of pipeline sealing can be effectively adapted.

Description

Forming process for wrapping teflon film outside silica gel sealing element
Technical Field
The invention relates to the technical field of silica gel sealing elements, in particular to a molding process of a teflon film wrapped outside a silica gel sealing element.
Background
The silica gel sealing element has good sealing performance and leakage resistance after being heated and vulcanized by a vulcanizing machine. Thus, silicone seals are often used for sealing the packaging of pipes, such as between swimming pools and water replenishing pipes.
However, when the silica gel sealing member is used in a swimming pool, particularly when some swimming pools are normal temperature swimming pools, the temperature of the water in the swimming pool is high, and substances such as copper sulfate are often added for sterilization, so that the silica gel sealing member used for sealing a pipeline is often easily corroded to cause the reduction of the service life, and therefore, certain improvements exist.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a forming process for wrapping a teflon film outside a silica gel sealing element, which can improve the service life to a certain extent.
The technical purpose of the invention is realized by the following technical scheme:
a molding process of a teflon film wrapped outside a silica gel sealing element comprises the following steps:
s1, performing sodium treatment on one surface of the teflon film to form a bonding surface;
s2, uniformly smearing bonding glue on the bonding surface of the Teflon film;
s3, after the bonding glue on the bonding surface of the Teflon film is preliminarily solidified, baking the Teflon film, and cooling;
s4, flatly paving the Teflon film on a template frame, wherein the template frame is provided with a placing station corresponding to each cavity of the mold, and placing the silica gel raw material on the bonding surface of the Teflon film based on the shape of the product, wherein the position of the silica gel raw material on the Teflon film corresponds to the placing station of the template frame;
and S5, taking the Teflon film off the template frame to carry the silica gel raw material to be placed in a mold of a vulcanizing machine for vulcanization molding so as to generate the silica gel sealing piece.
Through the technical scheme, the Teflon film has good chemical corrosion resistance, good high temperature resistance and good low temperature resistance, so that the Teflon film is coated on the silica gel sealing piece formed by manufacturing the silica gel raw material, the good sealing performance of the silica gel sealing piece is realized, the Teflon film has the characteristics of the Teflon film, the sealing requirements of swimming pool pipelines and other places are met, the surface of the silica gel sealing piece is smooth, the anti-sticking performance is good, and the service life of the silica gel sealing piece in the using process is ensured.
Preferably, after step S1, the method further includes the following steps:
s11, wiping and cleaning the two surfaces of the teflon film by using an alcohol solvent, airing at normal temperature, and entering the step S2.
Through the technical scheme, the surfaces of the Teflon films are cleaned through the alcohol solvent, stains and dust on the two surfaces of the Teflon films can be removed, and the adhesive force of the adhesive glue on the adhesive surfaces of the Teflon films is improved.
Preferably, the adhesive glue is formed by mixing a silica gel adhesive and a curing agent, and the mixing ratio of the silica gel adhesive to the curing agent is 50: 3.
Preferably, in the step S3, the baking temperature of the Teflon film is 130-160 ℃, and the baking time is 8-12 min.
Preferably, in step S4, at least one positioning hole is formed in the teflon film, and positioning pillars for inserting and matching with the positioning holes are disposed in the template frame and the mold.
Through above-mentioned technical scheme, when the teflon membrane tiled on the template frame, the reference column on the template frame will peg graft in the locating hole of teflon membrane, has improved the stability that the teflon membrane was placed on the template frame on the one hand, and on the other hand can make the silica gel raw materials when putting on the teflon membrane bonding surface, and the difficult off tracking of teflon membrane for the silica gel raw materials can accurately fall on the teflon membrane corresponding with the station of placing of template frame.
Preferably, in step S5, the vulcanization temperature is 175-195 ℃, the vulcanization time is 190-210S, and the vulcanization pressure is 175 kg/cm2~185 kg/cm2。
Preferably, in step S5, a fillet is provided at the right-angle junction of each molding surface of the mold cavity in the vulcanizer.
Through the technical scheme, the ductility of teflon membrane is relatively poor, consequently, teflon membrane is along with the silica gel raw materials vulcanization in-process, the easy ruptured condition that takes place of teflon membrane, consequently, this application is processed through to the mould die cavity, polish the right angle junction of every shaping surface in the mould die cavity, in order to polish into the radius angle, thereby improve the mobility of silica gel raw materials in the mould die cavity, avoid the silica gel raw materials too concentrated and the teflon membrane is broken in the shaping surface junction atress of mould die cavity, thereby effectively reduced the rejection rate of silica gel sealing member.
In summary, compared with the prior art, the beneficial effects of the invention are as follows:
the application makes the silica gel sealing member that forms with the cladding of teflon membrane outside the silica gel raw materials, not only has the good sealing performance of silica gel sealing member to can have the characteristics that teflon membrane is good, high temperature resistance can be good and low temperature resistance can be good of chemical resistance, can effectively adapt to pipeline sealing's application scene.
Drawings
FIG. 1 is a schematic flow chart of a molding process according to the present invention;
fig. 2 is a schematic structural diagram of a formwork support in the technical solution of the present invention.
Reference numerals: 1. a formwork support; 2. placing a station; 3. a teflon membrane; 4. silica gel raw material; 5. a positioning column; 6. and (7) positioning the holes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a silica gel sealing member outsourcing teflon membrane 3's forming technology, with the silica gel sealing member of the outer preparation formation of teflon membrane 3 cladding in silica gel raw materials 4, not only have the good sealing performance of silica gel sealing member to can have the characteristics that teflon membrane 3 is good, high temperature resistance is good and low temperature resistance is good of chemical resistance, can effectively adapt to pipeline sealing's application scene.
The forming process, as shown in fig. 1 and 2, includes the following steps:
s1, performing sodium treatment on one surface of the Teflon film 3 to form a bonding surface; specifically, because the surface of the teflon membrane 3 is smooth, if the surface of the teflon membrane 3 is not subjected to sodium treatment, the teflon membrane can not be bonded for use, after one surface of the teflon membrane 3 is subjected to sodium treatment by sodium treatment solution, the surface of the teflon membrane 3 has adhesive force, and can be coated with glue, so that the adhesive surface can be used.
After the step S1, the method further includes a step S11, in the step S11, wiping and cleaning two surfaces of the teflon film 3 with an alcohol solvent, airing at normal temperature, and then entering the step S2, wherein the time for airing the teflon film 3 at normal temperature is 8min to 10min, preferably 10 min. Therefore, the surfaces of the Teflon films 3 are cleaned by the alcohol solvent, stains and dust on the two surfaces of the Teflon films 3 can be removed, and the adhesive force of the subsequent adhesive glue on the adhesive surface of the Teflon film 3 is improved.
S2, uniformly smearing bonding glue on the bonding surface of the Teflon film 3; specifically, the adhesive glue is prepared by mixing a silica gel adhesive and a curing agent, wherein the mixing ratio of the silica gel adhesive to the curing agent is 50: 3.
S3, after the bonding glue on the bonding surface of the Teflon film 3 is preliminarily solidified, baking the Teflon film 3, and cooling; specifically, need stand after evenly scribbling bonding glue on the 3 bonding faces of teflon membrane in order to carry out preliminary solidification for bonding glue can effectively be attached to on the bonding face of teflon membrane 3, and it is the standard that no longer flows to use bonding glue on the 3 bonding faces of teflon membrane.
After the bonding glue is preliminarily solidified, the Teflon film 3 is flatly placed in an oven to be baked, in the application, the baking temperature of the Teflon film 3 ranges from 130 ℃ to 160 ℃, the baking time ranges from 8min to 12min, the preferable baking temperature ranges from 150 ℃ and is 10min, the Teflon film 3 is baked, the bonding glue on the bonding surface of the Teflon film 3 is effectively dried, and the surface of the Teflon film 3 is dried. The Teflon film 3 after the baking is finished is cooled to a normal temperature state, the cooling mode adopts an air-cooled cooling mode, the dust prevention is noticed in the process of cooling the Teflon film 3, and the dust is prevented from flying on the bonding surface of the Teflon film 3.
S4, the Teflon film 3 is tiled on the template frame 1, a placing station 2 corresponding to each cavity of the mold is arranged on the template frame 1, the silica gel raw material 4 is placed on the bonding surface of the Teflon film 3 based on the shape of the product, and the position of the silica gel raw material 4 on the Teflon film 3 corresponds to the placing station 2 of the template frame 1.
Specifically, the size and shape of the template frame 1 correspond to those of a mold, the mold is customized according to the shape of a manufactured silica gel sealing piece, wherein the mold is provided with a plurality of cavities, each cavity is used for forming one silica gel sealing piece, the template frame 1 is provided with a placing station 2 corresponding to each cavity of the mold, and the placing station 2 is used for marking the placing position of a silica gel raw material 4. In one embodiment, the placing station 2 is a notch arranged on the template frame 1, and the position and the size of the notch are matched with each cavity of the mold in a one-to-one correspondence mode. Because teflon membrane 3 has certain light transmissivity, when tiling teflon membrane 3 on template frame 1, the staff can see through teflon membrane 3 and see the position of placing station 2, and the staff only need to correspond the position of placing station 2 with silica gel raw materials 4, place on teflon membrane 3's bonding surface can.
And S5, taking the Teflon film 3 off the template frame 1 to carry the silica gel raw material 4, and placing the silica gel raw material in a mould of a vulcanizing machine for vulcanization molding to generate the silica gel sealing piece. Specifically, the vulcanizing temperature of the vulcanizing machine for the silica gel sealing element is 175-195 ℃, the vulcanizing time is 190-210 s, the vulcanizing pressure is 175 kg/cm 2-185 kg/cm2, preferably, the vulcanizing temperature is 185 ℃, the vulcanizing time is 200s, and the vulcanizing pressure is 180 kg/cm 2.
Wherein, seted up at least one locating hole 6 on the teflon membrane 3, all be provided with in template frame 1 and the mould and be used for with locating hole 6 grafting complex reference column 5. The quantity of locating hole 6 is provided with four, and four locating holes 6 are located the quadbit corner of indisputable fluorine dragon membrane 3 respectively, and from this, indisputable fluorine dragon membrane 3 is fixed a position by reference column 5 on template frame 1, has made things convenient for silica gel raw materials 4 to put on indisputable fluorine dragon membrane 3 bonding face, and indisputable fluorine dragon membrane 3 is difficult for the off tracking for silica gel raw materials 4 can accurately fall on indisputable fluorine dragon membrane 3 with corresponding with template frame 1 place station 2.
Accordingly, when the teflon film 3 is transferred to the mold on the template frame 1, the teflon film 3 is positioned by the positioning columns 5 on the mold, so that each silica gel raw material 4 of the teflon film 3 can accurately fall into each cavity of the mold when the mold is closed.
It is worth mentioning that in step S5, a fillet is provided at the right-angle junction of each molding surface of the mold cavity in the vulcanizer. Because, the ductility of teflon membrane 3 is relatively poor, consequently, teflon membrane 3 is along with 4 vulcanization in-process of silica gel raw materials, the easy condition that breaks takes place for teflon membrane 3, consequently, this application is processed through the mould die cavity, polish the right angle junction of every shaping surface in the mould die cavity, in order to polish into the fillet, thereby improve the mobility of silica gel raw materials 4 in the mould die cavity, avoid silica gel raw materials 4 too concentrated and teflon membrane 3 is broken in the shaping surface junction atress of mould die cavity, thereby effectively reduced the rejection rate of silica gel sealing member.
This application is used and is made the silica gel sealing member that forms with the cladding of teflon membrane 3 outside silica gel raw materials 4, not only has the good sealing performance of silica gel sealing member to can have the characteristics that teflon membrane 3 is good, high temperature resistance can be good and low temperature resistance can be good of chemical resistance, can effectively adapt to pipeline sealing's application scene.
The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.

Claims (7)

1. A molding process of a Teflon film wrapped outside a silica gel sealing element is characterized by comprising the following steps:
s1, performing sodium treatment on one surface of the teflon film (3) to form a bonding surface;
s2, uniformly smearing bonding glue on the bonding surface of the Teflon film (3);
s3, after the bonding glue on the bonding surface of the Teflon film (3) is preliminarily solidified, baking the Teflon film (3), and cooling;
s4, flatly paving a Teflon film (3) on a template frame (1), arranging a placing station (2) corresponding to each cavity of a mold on the template frame (1), arranging a silica gel raw material (4) on an adhesive surface of the Teflon film (3) based on the shape of a product, and enabling the position of the silica gel raw material (4) on the Teflon film (3) to correspond to the placing station (2) of the template frame (1);
and S5, taking the Teflon film (3) off the template frame (1) to carry the silica gel raw material (4) to be placed in a mold of a vulcanizing machine for vulcanization molding to generate the silica gel sealing piece.
2. The molding process of a teflon film wrapped on a silicone sealing member of claim 1, further comprising the following steps after step S1:
s11, wiping and cleaning the two surfaces of the Teflon film (3) by using an alcohol solvent, airing at normal temperature, and entering the step S2.
3. The molding process of a teflon film wrapped outside a silica gel sealing element according to claim 1, wherein the adhesive glue is formed by mixing a silica gel adhesive and a curing agent in a mixing ratio of 50: 3.
4. The forming process of the Teflon film wrapped outside the silicone rubber sealing member of claim 1, wherein in the step S3, the baking temperature of the Teflon film (3) is 130-160 ℃, and the baking time is 8-12 min.
5. The molding process of the teflon film wrapped on the silicone sealing element according to claim 1, wherein in step S4, at least one positioning hole (6) is formed in the teflon film (3), and positioning posts (5) for being inserted into and matched with the positioning holes (6) are disposed in the mold frame (1) and the mold.
6. The forming process of claim 1, wherein in step S5, the vulcanization temperature is 175-195 ℃, the vulcanization time is 190-210S, and the vulcanization pressure is 175 kg/cm2~185 kg/cm2。
7. The molding process of claim 1, wherein in step S5, a fillet is provided at the right-angle joint of each molding surface of the mold cavity in the vulcanizer.
CN201910029170.5A 2019-01-12 2019-01-12 Forming process for wrapping teflon film outside silica gel sealing element Active CN109532039B (en)

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CN111607232A (en) * 2020-04-17 2020-09-01 平湖阿莱德实业有限公司 Composite part with IP sealing function and EMI function and forming method thereof

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