Preparation method of felt silica gel coating heat-resistant pad

Abstract

The invention discloses a preparation method of a felt silica gel coating heat-resistant pad, which is characterized by comprising the following preparation steps: S1, reversely coating a base layer silica gel paste, and coating the base layer silica gel paste on a conveying belt; paving a felt on the base layer silica gel paste, and curing to obtain an inverted felt a coated with base layer silica gel; s3, the felt a coated with the base layer silica gel coats the base layer silica gel with a leveling silica gel layer; and after the inverted felt a coated with the base layer silica gel is overturned by 180 degrees, a leveling silica gel layer is coated. The device has the beneficial effects that the gluing frequency is reduced, the weight of the buffer cushion is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat-resistant pads, and in particular to a method for preparing a felt silicone-coated heat-resistant pad. Background Art

[0002] In the prior art:

[0003] CN201493914U discloses: a special buffer pad for hot press, which is used for hot press to press laminate floor, particle board, veneer, wooden door, furniture and the like. The buffer pad is composed of a polyester fabric skeleton (1) as a core layer, and the upper and lower surfaces of the polyester fabric skeleton (1) are covered with silica gel (2) as a surface layer. The buffer pad of the utility model adopts a polyester fabric skeleton as a core layer, has high tensile and tearing strength, is not easy to deform, has uniform thickness, and has a long service life.

[0004] CN214522367U discloses: a cushion pad for lamination process, the cushion pad comprises a pad, at least one through hole arranged on the pad, a silicone pad fixedly filled in the through hole, a first anti-adhesive layer fixedly covered on the pad and the first surface of the silicone pad, and a second anti-adhesive layer fixedly covered on the pad and the second surface of the silicone pad. When using the cushion pad for lamination process of the utility model, by arranging the pad, the pad can play the role of elastic buffering and uniform pressurization or heating in the process of circuit board lamination. By arranging the through hole on the pad and fixing the silicone pad in the through hole, when positioning the cushion pad, the positioning hole can be punched on the silicone pad, and since the silicone material does not have the problem of chipping, it can prevent the cushion pad from chipping. Further, by arranging the first anti-adhesive layer and the second anti-adhesive layer on the outermost layer of the cushion pad, it can prevent the adhesive from adhering to the cushion pad during the process of circuit board lamination.

[0005] In summary, in the lamination process of the solar panel production industry, silicone heat-resistant cushioning pads are used. Traditional cushioning pads (such as Figure 3 It is composed of double-sided silicone with cloth in the middle and has a certain degree of pressure resistance.

[0006] However, the structural design of the prior art has the following defects:

[0007] 1) The amount of silica gel used is large, the price is expensive, and the weight is also heavy;

[0008] 2) The silicone pad will extend in all directions during heat pressing and will rebound after the pressure is released. However, after multiple heat pressings, this extended part will form permanent deformation, which means it cannot be restored to its original state, and will also lead to reduced elasticity and unevenness.

[0009] In order to solve the above technical problems, the present invention provides a method for preparing a felt silicone coated heat-resistant pad. Summary of the invention

[0010] The purpose of the present invention is to provide a method for preparing a felt silicone coated heat-resistant pad.

[0011] To achieve the above object, the present invention is implemented by the following technical solutions:

[0012] A method for preparing a felt silicone coated heat-resistant pad comprises the following preparation steps:

[0013] S1 back coating base silicone paste

[0014] Apply the base silicone paste on the conveyor belt;

[0015] S2 base layer silicone paste covered with felt

[0016] Laying the felt flat on the base silica gel paste and curing it, and obtaining an inverted felt a coated with the base silica gel after curing;

[0017] S3: Felt coated with base silica gel a: Coat a leveling silica gel layer on the base silica gel;

[0018] The inverted felt a coated with base silicone is turned 180° and then coated with a leveling silicone layer.

[0019] As a further improvement of this scheme,

[0020] In S1, the back coating of the base silicone paste is performed on a vacuum horizontal operating table.

[0021] As a further improvement of this scheme,

[0022] The specific operation steps of S1 are:

[0023] Place a piece of conveyor belt on the left table facing the vacuum as the basic mold, adsorb the conveyor belt on the horizontal platform with vacuum, and then coat a layer of base silicone paste on the conveyor belt.

[0024] As a further improvement of this scheme,

[0025] The specific operation steps of S2 are:

[0026] The felt is laid flat on the base silica gel paste, and a blowing device 40 is arranged above the felt to provide blowing perpendicular to the felt.

[0027] As a further improvement of this scheme,

[0028] The specific operation steps of S3 are:

[0029] Apply a thin layer of leveling silicone;

[0030] The thickness of the leveling silicone layer is: 1-3mm according to customer needs. The thickness of each silicone coating is 1mm. Too thick coating will affect the internal drying and curing of the silicone. The thicker the silicone layer, the more coating times are required.

[0031] The formula composition of the leveling silicone layer is:

[0032] CaCO3--------8 parts.

[0033] M4503--------80 copies

[0034] D40--------10 servings

[0035] T40--------2 sets

[0036] The formula composition of the base silica gel paste for preparing the base silica gel is composed of the following components in parts by mass:

[0037] CaCO3

[0038] M4503 low shrinkage tear resistant silicone

[0039] D40 Thinner

[0040] T40 Curing Agent

[0041] During the preparation of silicone paste, the order of adding materials and the time of stirring and vacuuming should be strictly followed. First, add M4503 to the mixing tank, then add CaCO3 in proportion, start the mixer, stir and vacuum for 12 minutes, then add an appropriate amount of D40 diluent and continue stirring and vacuuming for 8 to 10 minutes, finally add T40 curing agent, stir and vacuum again for 10 to 15 minutes.

[0042] All silicone pastes must be poured and applied within 30 minutes after preparation, otherwise the hardening of the silicone paste will seriously affect the leveling effect and bubble removal effect.

[0043] As a further improvement of this scheme,

[0044] The formula composition of the base silica gel paste for preparing the base silica gel is composed of the following components in parts by mass:

[0045] CaCO 3 ------9 servings

[0046] M4503------78 copies

[0047] D40-------9 servings

[0048] T40-------4 servings

[0049] As a further improvement of this scheme,

[0050] The formula composition of the base silica gel paste for preparing the base silica gel is composed of the following components in parts by mass:

[0051] CaCO3

[0052] M4503 low shrinkage tear resistant silicone

[0053] D40 Thinner

[0054] T40 Curing Agent

[0055] The preparation method of the felt silicone coated heat-resistant pad of the present invention has the following beneficial effects:

[0056] 1. The present invention adopts the method of coating the surface of silicone with heat-resistant felt. Since the heat resistance of felts of different materials is different, the heat-resistant temperature range is 180-600°C, and the size and elasticity of the felt are relatively stable after heat pressing. According to the application, the appropriate type of felt is selected, and the silicone is evenly coated on the surface of the felt and cured, which can completely replace the full silicone pad, thereby saving costs and reducing the weight of the buffer pad;

[0057] 2. The present invention can completely suppress the burrs on the felt surface by applying the silica gel in the first step, reducing the number of times of applying the glue (each additional layer requires at least 16 hours of curing time), effectively improving the operating efficiency;

[0058] 3. The present invention uses the first step of reverse coating with silica gel, and the silica gel only penetrates a thin layer into the surface in contact with the felt. Compared with the operation of the prior art, the silica gel that completely fills the gaps in the felt is saved, thereby saving costs;

[0059] 4. The present invention uses the first step of reverse coating with silicone. Compared with the preparation method of the prior art, since there are no fiber protrusions on the surface, there is no need to coat the silicone multiple times, and only a thin layer of silicone is needed for leveling. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a schematic diagram of the working state of the back-coating of the base silicone paste in S1;

[0061] Figure 2 It is a schematic diagram of the working state of coating the leveling silicone layer in S3;

[0062] Figure 3 This is a product diagram of a cushion pad (double-sided silicone with cloth in the middle) in the prior art;

[0063] Figure 4 This is a product picture of the felt silicone coated heat-resistant pad of the present invention;

[0064] Figure 5 Product pictures of the front and back of the felt silicone coated heat-resistant pad of the present invention;

[0065] Figure 6 Product cross-sectional view of the felt silicone coated heat-resistant pad of the present invention. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described below in conjunction with embodiments and drawings:

[0067] The components in the following examples are selected as follows:

[0068] M4503 M 4503];

[0069] D40 [dearomatized solvent oil D40];

[0070] T40 T40】.

[0071] A method for preparing a felt silicone coated heat-resistant pad comprises the following preparation steps:

[0072] S1 back coating base silicone paste

[0073] Applying the base silica gel paste on the conveyor belt 20;

[0074] S2 base layer silicone paste covered with felt 11

[0075] The felt 11 is laid flat on the base silica gel paste and cured, and after curing, an inverted felt a coated with the base silica gel 12 is obtained;

[0076] S3: Felt a coated with base silicone 12; a leveling silicone layer 13 is coated on the base silicone 12.

[0077] The inverted felt a coated with the base silica gel 12 is turned over 180° and then coated with a leveling silica gel layer 13 .

[0078] In the prior art, due to the inherent characteristics of felt: felt is a material made of wool or other animal hair, it has felt gaps, and the surface of the felt has many burrs. The treatment method in the prior art is to apply silicone multiple times, which not only wastes silicone, but also requires multiple coatings to completely eliminate the fiber protrusions on the surface, requiring surface treatment and subsequent maintenance to reduce or remove burrs.

[0079] A method for preparing a felt silicone coated heat-resistant pad of the present invention:

[0080] The first step of reverse coating with silicone can completely suppress the burrs on the felt surface, reduce the number of times of coating and improve production efficiency (each additional layer requires at least 16 hours of curing time);

[0081] Furthermore, by reverse coating the silicone, the silicone only combines with the felt and penetrates into a thin layer, thus saving the silicone that completely fills the gaps in the felt;

[0082] Furthermore, due to the effect of gravity, the fiber protrusions on the surface are not only bent but also completely immersed in the base silicone paste. Since there are no fiber protrusions on the surface, there is no need to apply silicone multiple times. Only a thin layer of silicone is needed for leveling.

[0083] As a further preferred embodiment,

[0084] In S1 , the back coating of the base layer silicone paste is performed on a vacuum horizontal operating table 30 .

[0085] As a further preferred embodiment:

[0086] The specific operation steps of S1 are:

[0087] Place a conveyor belt 20 on the left table as the basic mold, vacuum absorb the conveyor belt on the horizontal platform, stick a circle of adhesive tape around the surface of the conveyor belt to form a pool type closed on all sides. The adhesive tape needs to be pasted with equal thickness, and then pour the base silicone paste in the pool formed by the adhesive tape on the conveyor belt. Use a long scraper (the scraper should be slightly longer than the width of the conveyor belt, and both ends should be pressed on the adhesive tape surface) to evenly scrape the silicone from one side to the other side, and the excess silicone will overflow from the adhesive tape surface.

[0088] As a further preferred embodiment,

[0089] The specific operation steps of S2 are:

[0090] The felt 11 is laid flat on the base silica gel paste, and a blowing device 40 is arranged above the felt 11 to provide blowing perpendicular to the felt 11 .

[0091] In this embodiment, in order to prevent the felt 11 from not being completely attached to the base silicone paste, several rows of constant pressure fans 40 are set up above the felt 11 to blow air vertically toward the felt 11, and the pressure of the wind is used to flatten the felt and tightly combine it with the silicone paste to absorb the silicone. Blowing air can also accelerate the curing of the silicone. After the silicone is cured, the felt is rolled up, the conveyor belt is removed, and the felt with the silicone surface facing up is adsorbed on the command platform. Due to the effect of wind pressure, the erected fibers of the felt are pressed down and sucked into the cured silicone.

[0092] As a further preferred embodiment,

[0093] The specific operation steps of S3 are:

[0094] Apply a thin layer of leveling silicone 13;

[0095] The thickness of the leveling silicone layer 13 is 1-3mm according to customer requirements. The thickness of each silicone coating is 1mm. Too thick coating will affect the internal drying and curing of the silicone. The thicker the silicone layer, the more coating times are required.

[0096] The formula composition of the leveling silicone layer 13 is:

[0097] CaCO 3 --------8 servings.

[0098] M4503--------80 copies

[0099] D40--------10 servings

[0100] T40--------2 sets

[0101] During the preparation of silica gel paste, the order of feeding and the time of stirring and vacuuming should be strictly followed. First, add M4503 into the stirring tank, and then add CaCO 3 , start the mixer, stir and vacuum for 12 minutes, then add an appropriate amount of D40 diluent and continue stirring and vacuuming for 12 minutes, finally add T40 curing agent, stir and vacuum again for 8 minutes.

[0102] All silicone pastes must be poured and applied within 30 minutes after preparation, otherwise the hardening of the silicone paste will seriously affect the leveling effect and bubble removal effect.

[0103] In the above embodiment, a thin layer of leveling silicone layer 13 is applied to the solidified base silicone layer 12. Since a layer of silicone has been solidified on the surface of the felt 11, the silicone applied later will not penetrate into the felt.

[0104] After the silicone is leveled and cured, you will get a heat-resistant cache pad with uniform thickness and no surface defects.

[0105] As a further preferred embodiment,

[0106] The formula composition of the base silica gel paste for preparing the base silica gel 12 is composed of the following components in parts by mass:

[0107] CaCO 3 ------9 servings

[0108] M4503------78 parts of low shrinkage tear-resistant silicone

[0109] D40-------9 parts of diluent

[0110] T40-------4 parts of curing agent

[0111] As a further preferred embodiment,

[0112] Description of the difference in the formula ratio between base layer silicone and leveling layer silicone:

[0113] Base silica gel 12 increases the CaCO 3 And reduce the proportion of D40. It can improve the hardness of the product matrix and effectively resist the extension after hot pressing.

[0114] Leveling layer reduces CaCO 3 Increasing the proportion of D40 can improve the overall flowability of the silicone paste and the flexibility of the surface after curing, which is beneficial to the leveling of the silicone layer and the release of bubbles hidden in the silicone paste.

[0115] Finally, the product Felt Silicone Coated Heat-resistant Pad A was tested for performance, and the test results are as follows:

[0116] Tensile strength 11.4 MPa;

[0117] Tear strength 59N / mm;

[0118] Temperature resistance ℃250;

[0119] Hardness (Shore A): working surface 65+ / -2, buffer surface 55+ / -5;

[0120] Normal service life is more than 3000 times;

[0121] The cost is 40-55% of the existing technology products.

[0122] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent changes made using the present invention are within the patent protection scope of the present invention.

Claims

1. A method for preparing a felt silicone coated heat-resistant pad, characterized in that: The method comprises the following preparation steps: S1 back coating base silicone paste Applying a base silica gel paste on the conveyor belt (20); S2 base silicone paste covered with felt (11) The felt (11) is laid flat on the base silica gel paste and cured, and after curing, an inverted felt a coated with the base silica gel (12) is obtained; S3: a felt a coated with a base silica gel (12); a leveling silica gel layer (13) is coated on the base silica gel (12); The inverted felt a coated with the base silica gel (12) is turned over 180 degrees and then coated with a leveling silica gel layer (13).

2. The method for preparing the felt silicone coated heat-resistant pad according to claim 1, characterized in that: In S1, the back coating of the base layer silicone paste is performed on a vacuum horizontal operating table (30).

3. The method for preparing the felt silicone coated heat-resistant pad according to claim 2, characterized in that: The specific operation steps of S1 are: A conveyor belt (20) is placed on the left table as a basic mold, and the conveyor belt is adsorbed on the horizontal platform by vacuum, and then a layer of base silica gel paste is coated on the conveyor belt.

4. The method for preparing the felt silicone coated heat-resistant pad according to claim 1, characterized in that: The specific operation steps of S2 are: The felt (11) is laid flat on the base silica gel paste, and a blowing device 40 is arranged above the felt (11) to provide blowing perpendicular to the felt (11).

5. The method for preparing the felt silicone coated heat-resistant pad according to claim 1, characterized in that: The specific operation steps of S3 are: Apply a thin layer of leveling silicone rubber (13); The thickness of the leveling silicone layer (13) is 1-3 mm according to customer requirements. The thickness of each silicone coating is 1 mm. Coating too thick will affect the drying and curing of the silicone inside. The thicker the silicone layer, the more times it needs to be coated. The formula composition of the leveling silica gel layer (13) is: CaCO3---8 parts. M4503---80 copies D40----10 servings T40---2 sets.

6. The method for preparing the felt silicone coated heat-resistant pad according to claim 1, characterized in that: The silicone paste of the silicone layer is prepared according to the following steps: Add M4503 to the mixing tank; Then add CaCO3 in proportion, start the mixer, stir and evacuate for 12 minutes; Then add an appropriate amount of D40 diluent and continue stirring and vacuuming for 12 minutes. Finally, add T40 curing agent and stir and vacuum again for 8 minutes. After all the silicone paste is prepared, pouring and coating can be completed within 30 minutes.

7. The method for preparing the felt silicone coated heat-resistant pad according to claim 1, characterized in that: The formula composition of the base silica gel paste for preparing the base silica gel (12) is composed of the following components in parts by mass: CaCO3--9 parts; M4503--78 copies; D40--9 parts; T40--4 copies.

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