KR100700666B1 - Silicone Pad for Impact Mitigation and Method for Preparing the Same - Google Patents

Abstract

The present invention relates to a shock-absorbing silicone pad and a method for manufacturing the same, and more particularly, to a shock-absorbing silicone pad containing a condensation type silicone polymer, a silicone oil and a condensation type silicone polymer curing agent and a method of manufacturing the same.

According to the present invention, a silicone pad having various hardness may be manufactured by mixing a silicone oil and an additional gel type silicone with a condensation type silicone polymer. The silicon pad according to the present invention is useful for protecting LCD liquid crystals of mobile phones and digital cameras from damage caused by external shock or internal shock.

Silicone, shock absorber, hardener

Description

Silicon pad for impact mitigation and method of manufacturing the same {Silicone Pad for Impact Mitigation and Method for Preparing the Same}

1 is an impact vertical absorption of urethane foam.

2 is a shock horizontal absorption of the urethane foam.

3 is a structural diagram showing a state in which the silicone pad of the present invention is coated on a PET film.

Figure 4 is an example of embossing the surface of the silicon pad of the present invention.

5 is a vertical dispersion of the impact that appears when an impact is applied to the silicon pad of the present invention.

6 is a horizontal dispersion of the impact that appears when an impact is applied to the silicon pad of the present invention.

The present invention relates to a shock-absorbing silicone pad and a method for manufacturing the same, and more particularly, to a shock-absorbing silicone pad containing a condensation type silicone polymer, a silicone oil and a condensation type silicone polymer curing agent and a method of manufacturing the same.

Previously, the products frequently used as shock absorbers to prevent damage caused by the impact of LCD liquid crystals were polyurethane foam and EPDM foam. Urethane foam is a porous product made of polyurethane, and is composed of polyurethane obtained by the reaction of isocyanate compound and glycol as a constituent material, and reaction of isocyanate as a component and water used as a bridge binder. It refers to a foamed product made by mixing a volatile solvent such as carbon dioxide and freon with a blowing agent. The bulk density of the foam can be controlled relatively freely and can be simply foamed anywhere on site. Depending on the type of raw glycol used, it can be divided into polyether foam and polyester foam. The former is flexible and the latter is suitable for use as an industrial foam. Therefore, the foam thus produced has various rigidities such as super soft, soft, semi hard, and hard.

In addition, EPDM (Ethylene Propylene Diene Monomer) is an amorphous polymer material obtained by the hybridization of ethylene and propylene, and is chemically stable. The vulcanized material has natural rubber and styrene butadiene rubber, SBR) has an intermediate property. EPDM is widely used in automobile parts, machinery parts, electrical parts, etc. It is used for non-automobile applications such as electric wires, hoses, building sponges, rubber chips forming elastic layers of urethane athletic facilities, and rubber chips for filling.

As described above, urethane foams and EPDM products have been used as a material for shock absorbing pads because they have easier firmness control, higher resilience, and less permanent compression strain than other rubber products. When an impact is applied vertically or horizontally to an object, the impact is dispersed in all directions. However, the urethane foam and EPDM products were able to effectively alleviate vertical impact due to the small cell structure (FIG. 1), but were very vulnerable to horizontal impact (FIG. 2). Recently, since liquid crystals of mobile phones, watches, PDPs, digital cameras, etc. are getting bigger, the degree of shock absorption should also be increased, but there is a shortage of existing shock mitigation products. In addition, in the case of urethane foam, a large part of the product is produced as industrial waste, and when disposed of, there is a problem in that it emits environmentally harmful substances.

Therefore, while the industry is considering materials that can replace urethane foams and EPDM products, silicon, which has a wide application field in construction, civil engineering, electricity, electronics, office equipment, aviation, and aerospace industry, is used as a shock absorbing material. It was intended to be utilized. In the case of silicon, it is an eco-friendly product that can not detect six major environmentally harmful substances. It has the advantage that there is no fear of environmental pollution such as urethane.

However, in the case of the shock-absorbing silicone pad developed in the art so far, the condensation-type silicone polymer as the main raw material, in this case, after stirring in an open state at room temperature, coating the PET film or the like, the curing speed is slow, bubbles Due to the instability of the dimensions and hardening by the inflow of air during stirring, many parts were lost. Also, in order to maximize the shock mitigation effect, the hardness of the silicone pad was within 50Hs (Shore 00) range. It should be noted, however, that silicone pads made of condensed silicone polymers as the main raw material have a very limited hardness ranging from 80 to 90 Hs.

In order to solve the hardness control problem as described above, the art has produced a shock-absorbing silicone pad using a silicon-added gel type silicone. However, in this case, when coating on a polymer film such as PET film, the curing occurs too fast, the hardness does not increase more than a certain level even after the curing is completed, the stickiness on the surface is severe, and the price of the raw material itself is high. There was a problem that adhesion to the film was not good.

Thus, in the art, in order to solve the above problems caused when the condensation type silicone polymer and the silicone addition gel type silicone are used alone, there has been an attempt to mix the silicone oil with the high hardness silicone polymer. That is, it is an attempt to add silicone oil to lower the hardness of the conventional condensation type silicone polymer. However, when the silicone oil is added to the condensation type silicone polymer, increasing the oil content to lower the hardness to a certain value, the curing rate of the silicone pad is slowed down, and when 70% or more of the weight of the condensation type silicone polymer is added, There was a problem that some of the oil leaked out of the cured silicone pad.

Therefore, in the art, it is excellent in the degree of shock relaxation, the hardness of the silicone pad can be adjusted according to the type and purpose of the product, there is an urgent need to develop a shock-absorbing silicone pad without the problem of environmental pollution.

Accordingly, the present inventors have completed the present invention as a result of the effort to develop a shock-absorbing silicone pad excellent in the degree of impact relaxation, can realize a variety of hardness of the silicone pad, there is no problem of environmental pollution.

After all, an object of the present invention relates to a shock-absorbing silicone pad containing a condensation type silicone polymer, a silicone oil and a condensation type silicone polymer curing agent and a method of manufacturing the same.

In order to achieve the above object, the present invention comprises the steps of (a) adding a silicone oil to the condensation type silicone polymer, stirring, and then defoaming; (b) adding silicone oil and a silicone polymer curing agent to the degassed mixture, stirring in a vacuum, and then defoaming; (c) injecting the dried compressed air into a mixture prepared in step (b) while the vacuum is released; And (d) provides a silicon pad comprising the step of coating the mixture prepared in step (c) to the polymer film.

In the present invention, the addition amount of the silicone oil in the steps (a) and (b) may be characterized in that 5 to 25 parts by weight and 10 to 60 parts by weight with respect to 100 parts by weight of the condensation type silicone polymer, respectively, In step (b) it may be characterized in that 20 to 120 parts by weight of the additional gel-type silicone with respect to 100 parts by weight of the condensation type silicone polymer is further added.

In the present invention, the silicone polymer curing agent may be characterized in that the CAT1000, CM670E and TitanumVI Isopropoxide, the addition amount of the curing agent is based on 100 parts by weight of condensation type silicone polymer, CAT1000 is 2 to 5 parts by weight, CM670E is 0.1 ~ 1 part by weight and TitanumVI Isopropoxide may be characterized in that 0.1 to 1 part by weight.

In the present invention, the silicone polymer curing agent CAT1000 is a curing agent in which a tin compound and an amine compound are mixed in a 1: 1 ratio, and the curing agent CM670E and TitaniumVI Isopropoxide are general-purpose reagents, and platinum compounds and titanium compounds are the main raw materials, respectively, from Toshiba and Junsei Chem. It is a hardening | curing agent which manufactures and sells.

The present invention also provides a shock-absorbing silicone pad produced by the above method, containing a condensation type silicone polymer and silicone oil and / or an additional gel type silicone as a main component, and having a hardness of 20 to 70 Hs. do.

In the present invention, the silicon pad may be characterized in that the flat pattern treatment or embossed.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention, it will be apparent to those skilled in the art that the scope of the present invention is not to be construed as being limited by these examples.

(1) Manufacture of Silicone Pads

Condensed Silicone Polymer (OH Polymer, Dongyang Silicon, Dow Corning Korea), Silicone Oil (Dongyang Silicon, Dow Corning Korea), Additive Gel Type Silicone (Gel Type A: Dongyang Silicon, Dow Corning Korea, Gel Type B: Dongyang Silicon, Dow Corning Korea), CAT1000 (Dongyang Silicon; Tin Compound: Amine = 1: 1), CM670E (Toshiba; Platinum Compound) and Titanium VI Isopropoxide (Junsei Chem; Titanium Compound) and Pigment (Cabon: XC-72R CABOT Dye: Industry) was added to the amounts listed in Table 1 to make silicone pads.

Ingredient / Example Example 1 Example 2 Example 3 Example 4 Example 5 Condensation Silicone Polymer (OH Polymer) 100 g 100 g 100 g 100 g 100 g Silicone Oil 50 g 60 g 60 g 65 g 20 g Additive Gel Type Silicone (Gel Type A) 56 g 20 g 10 g - - Additive Gel Type Silicone (Gel Type B) 56 g 20 g 10 g - -  Hardener CAT1000 3.8 g 2.73 g 2.73 g 2.8 g 2.4g CM670E 0.5g 0.3 g 0.3 g 0.25g 0.5g TitaniumVI Isopropoxide 0.5g 0.3 g 0.3 g 0.25g 0.5g Pigment 0.2 g 0.2 g 0.2 g 0.2 g 0.2 g

In order to manufacture a silicone pad according to the present invention, a silicon oil (1/3 of the total amount of silicone oil added) is added to a silicon quantitative ejector to reduce the hardness of the silicone pad with respect to 100 g of the condensation type silicone polymer, followed by stirring. And defoaming. To this was added silicone oil (2/3 of the total amount of silicone oil), a curing agent (CAT, CM670E, Titanium VI Isopropoxide) and the pigment 0.2g of the contents shown in Table 1 above, followed by high speed stirring and defoaming. At this time, the cooling water was circulated to prevent the change of the physical properties of the polymer due to the rise of the tank temperature. With the vacuum of the tank released, dry compressed air is injected into the blended polymer and oil (3 bar) and then transferred to a knife blade or roll blade through an air-blocked pipeline and then to the PET by thickness. Coated (FIG. 3). The blended silicone polymer and oil were coated onto PET by thickness and then dried with 75% humidity in the chamber.

After drying the silicone polymer and oil, a PE coated woven fabric was inserted into a sheet of paper (aging effect due to air permeability) to prepare a non-patterned silicone pad, and a sheet of embossed patterned sheet of paper was inserted and rolled into a roll form. After aging, the embossed paper was removed and the PE paper with a low surface energy was reinserted to prepare an embossed silicon pad (FIG. 4).

(2) curing speed and hardness of silicone pad

The curing temperature, curing time and hardness of the silicone pads prepared with the components and contents of Examples 1 to 5 were compared with the silicone pads made of condensation-type polymers and additive polymers that were used previously (Table 2). Hardness was measured by the method of (KSM3014 Shore 00). Comparative Examples 1 to 3 are silicone pads prepared by conventional methods, and each component is as described in the table. Comparative Example 1 is 100g of condensation type silicone polymer, Comparative Example 2 is 100g of addition gel type polymer, and Comparative Example 3 A mixture of 100 g and 65 g of silver condensed silicone polymer and silicone oil, respectively, and Comparative Examples each added 2.8 g of CAT300 (Dongyang Silicone; Amine Compound), a curing agent generally used in the manufacture of silicone pads in the art. Each was cured under the conditions of temperature 90 ℃ and humidity 70%.

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 (100 g of condensation type silicone polymer) Comparative Example 2 (100 g of Additive Gel Type Polymer) Comparative Example 3 (condensation type silicone polymer 100g silicone oil 65g) Curing temperature 90 ℃ 90 ℃ 90 ℃ 90 ℃ 90 ℃ 90 ℃ 90 ℃ 90 ℃ Curing time 15 minutes 15 minutes 15 minutes 15 minutes 15 minutes 1 hours 2 minutes 12 hours Hardness 20Hs 35Hs 45Hs 50Hs 70Hs 90Hs 10Hs 50Hs

As shown in Table 2, the curing temperature and curing time of the silicon pad according to Examples 1 to 5 were 90 ℃, 15 minutes, the hardness was 20Hs, 35Hs, 45Hs, 50Hs and 70Hs, respectively. In addition, in the case of Comparative Example 1 in which only 100g of the condensation type polymer was cured, the curing temperature, the curing time, and the hardness were 90 ° C., 1 hour, and 90Hs, respectively. Were 90 ° C., 2 minutes, and 10 Hs, respectively. In Comparative Example 3 in which 100 g of the condensation polymer and 65 g of the silicone oil were cured, the curing temperature, the curing time, and the hardness were 90 ° C., 12 hours, and 50 Hs, respectively.

If the hardness of the silicone pad is less than 20Hs, it is present as a gel type, and when the coating is applied to the film, the adhesion is not good. If the hardness is 70Hs or more, the silicone pad is too hard and the shock-absorbing effect is deteriorated. Therefore, it was found that the silicone pads prepared from the components of Comparative Examples 1 and 2 were not suitable for protecting the product from breakage due to external impact or internal impact.

In addition, when the condensation type silicone polymer and silicone oil were mixed and cured with the conventional curing agent CAT300 as in Comparative Example 3, the hardness was suitable at 50 Hs, but the curing time was 12 hours, and the curing rate of the silicone pad was too slow to be commercialized. It could be seen that there is a crowd.

As described above, through the present comparative experiment, the silicone pads prepared with the components and contents of Examples 1 to 5 of the present invention were applied to the silicone pads made of the conventional condensation type silicone polymer, the addition gel type polymer, and mixtures thereof. It was found to have superior effects. That is, the silicon pad according to the present invention can implement a hardness of 20 ~ 70Hs, when the impact is applied to the silicon pad, the impact is dispersed as shown in Figures 5 and 6, it is possible to safely protect the product.

Having described the specific part of the present invention in detail, it is obvious to those skilled in the art that such a specific description is only a preferred embodiment, thereby not limiting the scope of the present invention. something to do. Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

The present invention has the effect of providing a method for producing a shock-absorbing silicone pad containing, as a main component, a condensation type silicone polymer, a silicone oil and / or an additional gel type silicone and a condensation type silicone polymer curing agent.

According to the present invention, a silicone pad having various hardnesses of 20 to 70 Hs may be manufactured by mixing a silicone oil and an additional gel type silicone with a condensation type silicone polymer. The silicon pad according to the present invention is useful for protecting LCD liquid crystals of mobile phones and digital cameras from damage caused by external shock or internal shock.

Claims (7)

A method of manufacturing a shock absorbing silicone pad having a hardness of 20-70Hs, comprising the following steps: (a) adding silicone oil to the condensation type silicone polymer, stirring and defoaming; (b) adding silicone oil and a silicone polymer curing agent to the degassed mixture, stirring in a vacuum, and then defoaming; (c) injecting the dried compressed air into a mixture prepared in step (b) while the vacuum is released; And (d) coating the mixture prepared in step (c) on a polymer film Wherein the silicone polymer curing agent is CAT1000, CM670E and TitanumVI Isopropoxide, The amount of the silicone oil added in steps (a) and (b) is 5 to 25 parts by weight and 10 to 60 parts by weight, respectively, based on 100 parts by weight of the condensation type silicone polymer, and in step (b) The addition amount is 2 to 5 parts by weight for CAT1000, 0.1 to 1 part by weight for CM670E and 0.1 to 1 part by weight for TitanumVI Isopropoxide based on 100 parts by weight of condensation type silicone polymer. delete The method of claim 1, wherein in step (b), 20 to 120 parts by weight of the additional gel type silicone is added to 100 parts by weight of the condensation type silicone polymer. delete delete Prepared by the process according to claim 1 or 3, containing (i) condensation type silicone polymer and silicone oil, or (ii) condensation type silicone polymer, silicone oil and additional gel type silicone as a main component, and having a hardness of 20 Shock-resistant silicone pad, characterized in that ~ ~ 70Hs. The silicon pad of claim 6, wherein the silicon pad is flattened or embossed.

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