CN109397833B - Method for improving adhesive force of silica gel and PU (polyurethane) composite cloth - Google Patents
Method for improving adhesive force of silica gel and PU (polyurethane) composite cloth Download PDFInfo
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- CN109397833B CN109397833B CN201811113765.0A CN201811113765A CN109397833B CN 109397833 B CN109397833 B CN 109397833B CN 201811113765 A CN201811113765 A CN 201811113765A CN 109397833 B CN109397833 B CN 109397833B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1207—Heat-activated adhesive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
- B32B37/1207—Heat-activated adhesive
- B32B2037/1215—Hot-melt adhesive
- B32B2037/1223—Hot-melt adhesive film-shaped
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Abstract
The invention discloses a method for improving the adhesive force of silica gel and PU composite cloth, which comprises the following steps: and (3) vulcanizing: vulcanizing the silica gel sheet to obtain a vulcanized silica gel sheet; surface destruction: spraying a bridging agent on the surface of the vulcanized silica gel sheet; pre-burying thermosol: baking the silica gel sheet subjected to the surface damage step for the first time, then putting a first hot melt adhesive sheet into the silica gel sheet, and baking again to obtain the silica gel sheet with the pre-embedded hot melt adhesive; cutting: cutting the PU composite cloth and the second hot-melt adhesive sheet into required size and shape; hot-press bonding: and placing the second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet with the pre-embedded hot-melt adhesive, and performing hot-press bonding. The invention solves the problem of oil leakage on the surface of the silica gel, and has the advantages of firm bonding, difficult glue failure and stable silica gel surface; and the bonding process can be simplified, and the production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of bonding of silica gel and PU (polyurethane) composite cloth, in particular to a method for improving the bonding force of the silica gel and the PU composite cloth.
Background
In the prior art, to bond the silica gel and the PU composite cloth, the surface of the silica gel is generally cleaned by laser and plasma treatment, and then the hot melt adhesive is added between the silica gel and the PU composite cloth, and the three are bonded by hot pressing to form a whole. However, laser processing generally requires 2 minutes, plasma processing generally requires 1.5 minutes, and the time consumption is long, so that the production efficiency is seriously influenced; moreover, by adopting the method in the prior art, the problems that the surface of the silica gel is oil-infiltrated and unstable due to laser treatment and plasma treatment, so that the silica gel is bonded with the hot melt adhesive firmly and is easy to separate from the PU composite cloth often occur.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to: the method for improving the adhesive force of the silica gel and the PU composite cloth solves the problem of oil leakage on the surface of the silica gel, and the silica gel and the PU composite cloth are adhered by the method, so that the method has the advantages of firm adhesion, difficult glue failure and stable silica gel surface; and the process of bonding the silica gel and the PU composite cloth can be simplified, and the production efficiency is improved.
The purpose of the invention is realized by adopting the following technical scheme:
a method for improving the adhesive force of silica gel and PU composite cloth is characterized by comprising the following steps:
and (3) vulcanizing: selecting a silica gel sheet, and vulcanizing the silica gel sheet to obtain a vulcanized silica gel sheet;
surface destruction: spraying a bridging agent on the surface of the vulcanized silica gel sheet;
pre-burying thermosol: baking the silica gel sheet subjected to the surface damage step for the first time, then putting a first hot melt adhesive sheet into the silica gel sheet, and baking again to obtain the silica gel sheet with the pre-embedded hot melt adhesive;
cutting: cutting the PU composite cloth and the second hot-melt adhesive sheet into required size and shape;
hot-press bonding: and placing a second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet of the pre-embedded hot-melt adhesive, and carrying out hot-press bonding.
Further, in the step of pre-embedding the thermosol, baking is carried out in a baking oven, wherein the baking temperature for the first time is 100-120 ℃, and the baking time is 20-30 minutes; the temperature for secondary baking is 170-200 ℃, and the baking time is 20-25 minutes.
Further, between the step of pre-embedding the hot melt adhesive and the step of cutting, the method also comprises the step of drying: and baking the silica gel sheet pre-embedded with the hot melt adhesive after the silica gel sheet is cooled.
Further, in the drying step, baking is carried out in a baking oven, the baking temperature is 150-180 ℃, and the baking time is 0.5-1.5 hours.
Further, in the drying step, the cooling time is 5 to 15 minutes.
Further, in the step of hot-pressing adhesion, an upper die of a hot-pressing die is preheated firstly; the preheating temperature is 110-130 ℃; the hot-press bonding time is 5S-15S.
Further, in the step of vulcanizing, a platinum silica gel sheet is selected as the silica gel sheet, and the vulcanizing temperature of the silica gel sheet is 100-120 ℃.
Further, in the step of pre-embedding the thermosol, the first hot melt adhesive sheet is a high-temperature-resistant low-hardness hot melt adhesive; in the cutting step, the second hot melt adhesive sheet is a hot melt adhesive with high temperature resistance and low hardness.
Further, in the step of cutting, it is right still to include the silica gel piece of pre-buried hot melt adhesive, PU composite cloth with the second hot melt adhesive film punches, obtains foraminiferous pre-buried hot melt adhesive's silica gel piece, PU composite cloth and second hot melt adhesive film.
Further, between the step of cutting and the step of thermocompression bonding, the method further comprises the step of placing a flexible circuit board: and placing the flexible circuit board inside the silica gel sheet with the pre-embedded hot melt adhesive and connecting the connecting part on the flexible circuit board with the outside through the holes in the silica gel sheet with the pre-embedded hot melt adhesive, the second hot melt adhesive sheet and the PU composite cloth.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the first hot-melt adhesive sheet is placed in the silica gel sheet, so that the first hot-melt adhesive sheet is embedded in the silica gel sheet, the first hot-melt adhesive sheet and the silica gel sheet are integrated, and after the silica gel and the PU composite cloth are bonded, the oil seepage phenomenon of the silica gel can be effectively prevented, so that the stability of the surface of the silica gel is improved, the silica gel and the PU composite cloth are not easy to separate, and the glue is not easy to open.
2. The invention does not need to carry out laser and plasma treatment on the silica gel, simplifies the process, is convenient to operate and greatly improves the production efficiency.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment. The equipment and raw materials used are all available on the market or commonly used in the field. The methods in the following examples are conventional in the art unless otherwise specified.
A method for improving the adhesive force of silica gel and PU composite cloth comprises the following steps:
and (3) vulcanizing: selecting a silica gel sheet, vulcanizing the silica gel sheet, and reducing the vulcanization temperature to 100-120 ℃ to obtain a vulcanized silica gel sheet;
surface destruction: spraying a bridging agent on the surface of the vulcanized silica gel sheet; the bridging agent is sprayed on the surface of the vulcanized silica gel sheet, so that the silica gel and the hot melt adhesive are combined more firmly, and the silica gel is not easy to separate from the PU composite cloth.
Pre-burying thermosol: baking the silica gel sheet subjected to the surface damage step for the first time, wherein the baked silica gel is in a half-cooked state, then putting a first hot melt adhesive sheet into the silica gel sheet, and baking again to obtain the silica gel sheet with the pre-embedded hot melt adhesive; in the silica gel piece of pre-buried hot melt adhesive, silica gel and hot melt adhesive fuse as an organic whole, can effectively prevent the silica gel oil impregnate, improve the stability of silica gel.
Cutting: cutting the PU composite cloth and the second hot-melt adhesive sheet into required size and shape;
hot-press bonding: and placing the second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet with the pre-embedded hot-melt adhesive, and performing hot-press bonding.
As a further implementation mode, in the step of pre-embedding the thermosol, baking is carried out in a baking oven, the temperature for primary baking is 100-120 ℃, and the baking time is 20-30 minutes; the temperature for secondary baking is 170-200 ℃, and the baking time is 20-25 minutes.
As a further implementation mode, between the step of pre-embedding the hot melt adhesive and the step of cutting, the method further comprises the step of drying: and baking the silica gel sheet pre-embedded with the hot melt adhesive after the silica gel sheet is cooled.
As a further embodiment, in the drying step, the baking is performed in a baking oven at a baking temperature of 150 ℃ to 180 ℃ for a baking time of 0.5 to 1.5 hours.
As a further embodiment, in the drying step, the cooling time is 5 to 15 minutes.
As a further embodiment, in the step of hot-pressing adhesion, an upper die of a hot-pressing die is preheated; the preheating temperature is 110-130 ℃; the hot-press bonding time is 5S-15S.
In the step of vulcanizing, a platinum silica gel sheet is selected as the silica gel sheet, and the vulcanizing temperature of the silica gel sheet is 100-120 ℃. The platinum material is added into the silica gel, so that the vulcanization temperature of the silica gel can be reduced; but also can be used for FDA food-grade environment-friendly products.
As a further implementation mode, in the step of pre-embedding the thermosol, the first hot melt adhesive sheet is a hot melt adhesive with high temperature resistance and low hardness; in the cutting step, the second hot melt adhesive sheet is a hot melt adhesive with high temperature resistance and low hardness.
As a further implementation mode, in the cutting step, the method further comprises the step of punching the silica gel sheet with the pre-embedded hot melt adhesive, the PU composite cloth and the second hot melt adhesive sheet to obtain the silica gel sheet with the pre-embedded hot melt adhesive and the second hot melt adhesive sheet with the holes. The cutting uses a laser knife die.
As a further implementation mode, between the step of cutting and the step of thermocompression bonding, the method further comprises the step of placing the flexible circuit board: and placing the flexible circuit board inside the silica gel sheet with the pre-embedded hot melt adhesive and connecting the connecting part on the flexible circuit board with the outside through the holes in the silica gel sheet with the pre-embedded hot melt adhesive, the second hot melt adhesive sheet and the PU composite cloth.
Example 1:
a method for improving the adhesive force of silica gel and PU composite cloth comprises the following steps:
and (3) vulcanizing: selecting a platinum silica gel sheet, vulcanizing the platinum silica gel sheet at the vulcanization temperature of 120 ℃ to obtain a vulcanized silica gel sheet;
surface destruction: spraying KE-30 odorless bridging agent on the surface of the vulcanized silica gel sheet;
pre-burying thermosol: baking the silica gel sheet subjected to the surface destruction step in a high-temperature baking oven for the first time, wherein the baking temperature is 100 ℃, and the baking time is 20 minutes; baking the silica gel to a semi-cooked state, then putting a first hot-melt adhesive sheet with high temperature resistance and low hardness into the silica gel sheet, and baking again in a high-temperature baking oven at the baking temperature of 170 ℃ for 20 minutes; obtaining a silica gel sheet with a pre-embedded hot melt adhesive;
and (3) drying: after the silica gel sheet embedded with the hot melt adhesive is cooled for 5 minutes, putting the silica gel sheet into a high-temperature baking oven for baking at the baking temperature of 150 ℃ for 0.5 hour;
cutting: cutting the PU composite cloth and the second hot melt adhesive sheet with high temperature resistance and low hardness into required sizes and shapes;
hot-press bonding: placing a second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet with the pre-embedded hot-melt adhesive; the upper die of the hot-pressing die is preheated to 110 ℃, and then hot-pressed and bonded for 5 seconds.
Example 2:
a method for improving the adhesive force of silica gel and PU composite cloth comprises the following steps:
and (3) vulcanizing: selecting a platinum silica gel sheet, vulcanizing the platinum silica gel sheet at the vulcanization temperature of 100 ℃ to obtain a vulcanized silica gel sheet;
surface destruction: spraying a bridging agent on the surface of the vulcanized silica gel sheet;
pre-burying thermosol: baking the silica gel sheet subjected to the surface destruction step in a high-temperature baking oven for the first time, wherein the baking temperature is 120 ℃, and the baking time is 30 minutes; baking the silica gel to a semi-cooked state, then putting a first hot-melt adhesive sheet with high temperature resistance and low hardness into the silica gel sheet, and baking again in a high-temperature baking oven at the baking temperature of 200 ℃ for 25 minutes; obtaining a silica gel sheet with a pre-embedded hot melt adhesive;
and (3) drying: after the silica gel sheet embedded with the hot melt adhesive is cooled for 15 minutes, putting the silica gel sheet into a high-temperature baking oven for baking at the baking temperature of 180 ℃ for 1.5 hours;
cutting: cutting the PU composite cloth and the second hot melt adhesive sheet with high temperature resistance and low hardness into required sizes and shapes;
hot-press bonding: placing a second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet with the pre-embedded hot-melt adhesive; the upper die of the hot-pressing die is preheated to 130 ℃, and then hot-pressed and bonded for 15S.
Example 3:
a method for improving the adhesive force of silica gel and PU composite cloth comprises the following steps:
and (3) vulcanizing: selecting a platinum silica gel sheet, vulcanizing the platinum silica gel sheet at the vulcanization temperature of 110 ℃ to obtain a vulcanized silica gel sheet;
surface destruction: spraying a bridging agent on the surface of the vulcanized silica gel sheet;
pre-burying thermosol: baking the silica gel sheet subjected to the surface destruction step in a high-temperature baking oven for the first time, wherein the baking temperature is 110 ℃, and the baking time is 25 minutes; baking the silica gel to a semi-cooked state, then putting a first hot-melt adhesive sheet with high temperature resistance and low hardness into the silica gel sheet, and baking again in a high-temperature baking oven at 190 ℃ for 22 minutes; obtaining a silica gel sheet with a pre-embedded hot melt adhesive;
and (3) drying: after the silica gel sheet embedded with the hot melt adhesive is cooled for 10 minutes, putting the silica gel sheet into a high-temperature baking oven for baking at 165 ℃ for 1 hour;
cutting: cutting the PU composite cloth and the second hot melt adhesive sheet with high temperature resistance and low hardness into required sizes and shapes;
hot-press bonding: placing a second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet with the pre-embedded hot-melt adhesive; the upper die of the hot-pressing die is preheated to 120 ℃, and then hot-pressed and bonded for 10 seconds.
Example 4:
a method for improving the adhesive force of silica gel and PU composite cloth comprises the following steps:
and (3) vulcanizing: selecting a platinum silica gel sheet, vulcanizing the platinum silica gel sheet at the vulcanization temperature of 120 ℃ to obtain a vulcanized silica gel sheet;
surface destruction: spraying KE-30 odorless bridging agent on the surface of the vulcanized silica gel sheet;
pre-burying thermosol: baking the silica gel sheet subjected to the surface destruction step in a high-temperature baking oven for the first time, wherein the baking temperature is 100 ℃, and the baking time is 20 minutes; baking the silica gel to a semi-cooked state, then putting a first hot-melt adhesive sheet with high temperature resistance and low hardness into the silica gel sheet, and baking again in a high-temperature baking oven at the baking temperature of 170 ℃ for 20 minutes; obtaining a silica gel sheet with a pre-embedded hot melt adhesive;
and (3) drying: after the silica gel sheet embedded with the hot melt adhesive is cooled for 5 minutes, putting the silica gel sheet into a high-temperature baking oven for baking at the baking temperature of 150 ℃ for 0.5 hour;
cutting: cutting the PU composite cloth and the second hot melt adhesive sheet with high temperature resistance and low hardness into required sizes and shapes; punching the silica gel sheet with the pre-embedded hot melt adhesive, the PU composite cloth and the second hot melt adhesive sheet to obtain the silica gel sheet with the pre-embedded hot melt adhesive, the PU composite cloth and the second hot melt adhesive sheet with holes;
placing a flexible circuit board: placing the flexible circuit board inside the silica gel sheet with the pre-embedded hot melt adhesive and the holes, wherein the holes are formed in the silica gel sheet with the pre-embedded hot melt adhesive, the second hot melt adhesive sheet and the PU composite cloth;
hot-press bonding: placing a second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet with the pre-embedded hot-melt adhesive; the upper die of the hot-pressing die is preheated to 110 ℃, and then hot-pressed and bonded for 5 seconds.
Example 5:
a method for improving the adhesive force of silica gel and PU composite cloth comprises the following steps:
and (3) vulcanizing: selecting a platinum silica gel sheet, vulcanizing the platinum silica gel sheet at the vulcanization temperature of 100 ℃ to obtain a vulcanized silica gel sheet;
surface destruction: spraying a bridging agent on the surface of the vulcanized silica gel sheet;
pre-burying thermosol: baking the silica gel sheet subjected to the surface destruction step in a high-temperature baking oven for the first time, wherein the baking temperature is 120 ℃, and the baking time is 30 minutes; baking the silica gel to a semi-cooked state, then putting a first hot-melt adhesive sheet with high temperature resistance and low hardness into the silica gel sheet, and baking again in a high-temperature baking oven at the baking temperature of 200 ℃ for 25 minutes; obtaining a silica gel sheet with a pre-embedded hot melt adhesive;
and (3) drying: after the silica gel sheet embedded with the hot melt adhesive is cooled for 15 minutes, putting the silica gel sheet into a high-temperature baking oven for baking at the baking temperature of 180 ℃ for 1.5 hours;
cutting: cutting the PU composite cloth and the second hot melt adhesive sheet with high temperature resistance and low hardness into required sizes and shapes; punching the silica gel sheet with the pre-embedded hot melt adhesive, the PU composite cloth and the second hot melt adhesive sheet to obtain the silica gel sheet with the pre-embedded hot melt adhesive, the PU composite cloth and the second hot melt adhesive sheet with holes;
placing a flexible circuit board: placing the flexible circuit board inside the silica gel sheet with the pre-embedded hot melt adhesive and the holes, wherein the holes are formed in the silica gel sheet with the pre-embedded hot melt adhesive, the second hot melt adhesive sheet and the PU composite cloth;
hot-press bonding: placing a second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet with the pre-embedded hot-melt adhesive; the upper die of the hot-pressing die is preheated to 130 ℃, and then hot-pressed and bonded for 15S.
Example 6:
a method for improving the adhesive force of silica gel and PU composite cloth comprises the following steps:
and (3) vulcanizing: selecting a platinum silica gel sheet, vulcanizing the platinum silica gel sheet at the vulcanization temperature of 110 ℃ to obtain a vulcanized silica gel sheet;
surface destruction: spraying a bridging agent on the surface of the vulcanized silica gel sheet;
pre-burying thermosol: baking the silica gel sheet subjected to the surface destruction step in a high-temperature baking oven for the first time, wherein the baking temperature is 110 ℃, and the baking time is 25 minutes; baking the silica gel to a semi-cooked state, then putting a first hot-melt adhesive sheet with high temperature resistance and low hardness into the silica gel sheet, and baking again in a high-temperature baking oven at 190 ℃ for 22 minutes; obtaining a silica gel sheet with a pre-embedded hot melt adhesive;
and (3) drying: after the silica gel sheet embedded with the hot melt adhesive is cooled for 10 minutes, putting the silica gel sheet into a high-temperature baking oven for baking at 165 ℃ for 1 hour;
cutting: cutting the PU composite cloth and the second hot melt adhesive sheet with high temperature resistance and low hardness into required sizes and shapes; punching the silica gel sheet with the pre-embedded hot melt adhesive, the PU composite cloth and the second hot melt adhesive sheet to obtain the silica gel sheet with the pre-embedded hot melt adhesive, the PU composite cloth and the second hot melt adhesive sheet with holes;
placing a flexible circuit board: placing the flexible circuit board inside the silica gel sheet with the pre-embedded hot melt adhesive and the holes, wherein the holes are formed in the silica gel sheet with the pre-embedded hot melt adhesive, the second hot melt adhesive sheet and the PU composite cloth;
hot-press bonding: placing a second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet with the pre-embedded hot-melt adhesive; the upper die of the hot-pressing die is preheated to 120 ℃, and then hot-pressed and bonded for 10 seconds.
Comparative examples 1 to 2:
comparative examples 1-2 are a silicone sheet and a PU composite cloth bonded by the prior art,
comparative example 1 is firstly radiussed for 2 minutes, and comparative example 2 is firstly processed for 1.5 minutes by an ion method;
and then adding hot melt adhesive between the silica gel and the PU composite cloth, and carrying out hot-pressing adhesion on the silica gel and the PU composite cloth.
Verification of the examples:
the examples 1 to 6 and comparative examples 1 to 2 were subjected to a peel force test to verify the advantageous effects of the present invention.
The test method comprises the following steps: the silica gel and the PU composite cloth bonded by the methods of examples 1-6 and comparative examples 1-2 are firstly peeled by hands, then put into a peeling machine for machine peeling, and the maximum force value and the average force value of the two ends of the silica gel peeled from the PU composite cloth are recorded in the peeling process; the two ends of the silicone gel are referred to simply as end 1 and end 2 in the test results;
and (4) judging a result: if the average force value is greater than 10N and the peeling force values of the two end parts of the silica gel are greater than 10N, the silica gel and the PU composite cloth bonded by the method are considered to pass the test; and if the average force value is less than 10N or the force value of any one end of the two ends of the silica gel is less than 10N, the silica gel and PU composite cloth bonded by the method is considered to fail the test. The higher the residual ratio of the silica gel on the PU composite cloth, the more firmly the silica gel is bonded to the PU composite cloth.
And (3) testing results: the test results of examples 1 to 6 and comparative examples 1 to 2 are shown in Table 1.
Table 1 shows the test results of examples 1 to 6 and comparative examples 1 to 2:
as can be seen from Table 1, the peel force tests of examples 1-6 are all qualified, and the qualification rate is relatively stable, so that the method of examples 1-6 can effectively improve the adhesive force of the silica gel and the PU composite cloth; compared with comparative examples 1-2, the yield of examples 1-6 is obviously higher, rework can be reduced, and production efficiency is improved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A method for improving the adhesive force of silica gel and PU composite cloth is characterized by comprising the following steps:
and (3) vulcanizing: selecting a silica gel sheet, and vulcanizing the silica gel sheet to obtain a vulcanized silica gel sheet;
surface destruction: spraying a bridging agent on the surface of the vulcanized silica gel sheet;
pre-burying thermosol: baking the silica gel sheet subjected to the surface damage step for the first time, then putting a first hot melt adhesive sheet into the silica gel sheet, and baking again to obtain the silica gel sheet with the pre-embedded hot melt adhesive;
cutting: cutting the PU composite cloth and the second hot-melt adhesive sheet into required size and shape;
hot-press bonding: and placing a second hot-melt adhesive sheet between the PU composite cloth and the silica gel sheet of the pre-embedded hot-melt adhesive, and carrying out hot-press bonding.
2. The method for improving the adhesive force of the silica gel and the PU composite cloth according to claim 1, wherein in the step of pre-embedding the thermosol, the baking is carried out in a baking oven, the temperature of the primary baking is 100-120 ℃, and the baking time is 20-30 minutes; the temperature for secondary baking is 170-200 ℃, and the baking time is 20-25 minutes.
3. The method for improving the adhesive force of the silica gel and the PU composite cloth according to claim 1, wherein a drying step is further included between the step of pre-embedding the thermosol and the step of cutting: and baking the silica gel sheet pre-embedded with the hot melt adhesive after the silica gel sheet is cooled.
4. The method for improving the adhesive force of the silica gel and the PU composite cloth according to claim 3, wherein in the drying step, the baking is carried out in a baking oven, the baking temperature is 150-180 ℃, and the baking time is 0.5-1.5 hours.
5. The method for improving the adhesion of silica gel and PU composite cloth according to claim 3, wherein in the drying step, the cooling time is 5-15 minutes.
6. The method for improving the bonding force of the silica gel and the PU composite cloth according to claim 1, wherein in the step of hot-pressing, an upper die of a hot-pressing die is preheated; the preheating temperature is 110-130 ℃; the hot-press bonding time is 5S-15S.
7. The method for improving the adhesive force of the silica gel and the PU composite cloth according to claim 1, wherein in the vulcanizing step, the silica gel sheet is a platinum silica gel sheet, and the vulcanizing temperature of the silica gel sheet is 100 ℃ to 120 ℃.
8. The method for improving the adhesive force of the silica gel and the PU composite cloth according to claim 1, wherein in the step of pre-embedding the thermosol, the first hot melt adhesive sheet is a high temperature resistant low hardness hot melt adhesive; in the cutting step, the second hot melt adhesive sheet is a hot melt adhesive with high temperature resistance and low hardness.
9. The method for improving the adhesive force between the silica gel and the PU composite cloth according to claim 1, wherein the cutting step further comprises punching the silica gel sheet of the pre-embedded hot melt adhesive, the PU composite cloth and the second hot melt adhesive sheet to obtain the silica gel sheet of the pre-embedded hot melt adhesive with the hole, the PU composite cloth and the second hot melt adhesive sheet.
10. The method for improving the adhesive force of the silica gel and the PU composite cloth according to claim 9, wherein between the step of cutting and the step of thermocompression bonding, a step of placing a flexible circuit board is further included: and placing the flexible circuit board inside the silica gel sheet with the pre-embedded hot melt adhesive and connecting the connecting part on the flexible circuit board with the outside through the holes in the silica gel sheet with the pre-embedded hot melt adhesive, the second hot melt adhesive sheet and the PU composite cloth.
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| CN109397833A (en) | 2019-03-01 |
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