Porous breathable breast pad and preparation method thereof

Abstract

The invention belongs to the technical field of bras, and particularly relates to a porous breathable breast pad and a preparation method thereof.The breast pad comprises a component A and a component B. The component A comprises, by weight, 20-22 parts of first vinyl silicone oil, 9-12 parts of dimethyl silicone oil, 37-39 parts of modified white carbon black, 38-41 parts of vinyl MQ silicon resin, 0.01-0.02 part of a catalyst and 1-2 parts of a foaming agent; the component B comprises the following raw materials in parts by weight: 58-61 parts of second vinyl silicone oil, 38-40 parts of hydrogen-containing silicone oil and 0.03-0.05 part of an inhibitor. The porous breathable breast pad prepared by the invention has good mechanical properties and comfort.

Description

Technical Field

[0001] The invention belongs to the technical field of bras, and particularly relates to a porous breathable breast pad and a preparation method thereof. Background Art

[0002] With the development of society, people's pace of life has accelerated, their daily routines have become irregular, and they are overloaded with work. At the same time, women wear bras for longer periods of time, and the incidence of breast diseases has increased. Therefore, the requirements for the comfort of bras have become higher and higher. As an important part of the bra, the bra pad plays a very important role in the overall quality of the bra and people's experience of using it. Currently, the commonly used bra pads are roughly divided into sponge bra pads, non-woven fiber cotton bra pads, and silicone bra pads based on the material. Among them, sponge bra pads and non-woven fiber cotton bra pads are not elastic enough, easy to deform, and have insufficient support, and have a poor sense of use. Silicone bra pads have become widely used in this field.

[0003] Patent CN103689822B discloses a non-film-coated breathable silicone breast pad, including a silicone breast pad body, the silicone breast pad body at least including a silicone gel bottom layer and a silicone gel surface layer stacked and combined from bottom to top along the thickness direction, the silicone gel bottom layer has a harderness than the silicone gel surface layer, and the silicone gel bottom layer contains a lightweight polymer micro-bead filler; the silicone breast pad body has air holes running through it along its thickness direction. The silicone breast pad of this invention has the advantages of light weight, good air permeability, easy cleaning and high surface softness, but does not take into account the problem of easy deformation and cracking after high-speed washing in a washing machine after punching.

[0004] Patent CN105394826B discloses a Chinese medicine health care silicone breast pad, including a multi-layer film bag composed of at least three layers of TPU film stacked and combined together along the periphery, wherein the multi-layer film bag includes an inner film bag and at least one outer film bag from the inside to the outside; the outer film bag is filled with silicone, which is combined with the TPU film forming the outer film bag after thermal curing; the inner film bag is filled with Chinese medicine powder. The Chinese medicine health care silicone breast pad of this invention can play a health care and physical therapy role on the human body after wearing, and it also has the good touch and shaping effect of the silicone breast pad, but it does not take into account the problem of air permeability, and the use feeling is poor.

[0005] Therefore, there is an urgent need for a silicone breast pad with good mechanical properties and good usability in the market. Summary of the invention

[0006] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a silicone breast pad with good mechanical properties, high washability, light weight and high comfort.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The first aspect of the present invention provides a porous breathable chest pad, comprising component A and component B, wherein component A comprises the following raw materials in parts by weight: 20-22 parts of a first vinyl silicone oil, 9-12 parts of dimethyl silicone oil, 37-39 parts of modified white carbon black, 38-41 parts of vinyl MQ silicone resin, 0.01-0.02 parts of a catalyst, and 1-2 parts of a foaming agent; component B comprises the following raw materials in parts by weight: 58-61 parts of a second vinyl silicone oil, 38-40 parts of hydrogen-containing silicone oil, and 0.03-0.05 parts of an inhibitor.

[0009] Preferably, the catalyst is a platinum catalyst; the foaming agent is zinc carbonate; and the inhibitor is ethynyl cyclohexanol.

[0010] In some embodiments, the method for preparing the modified silica comprises the following steps:

[0011] 1) Add allyl glycidyl ether and sodium hydroxide to dioxane, react at 70-80°C for 5-6h, cool to room temperature, add thionyl chloride while stirring, react at 0-5°C for 3-5h, and rotary evaporate to obtain a compound;

[0012] 2) Under the protection of inert gas, the compound obtained in step 1), white carbon black and 4-dimethylaminopyridine are added to dichloromethane, stirred at 25-35° C. for 35-37 hours, filtered and washed to obtain modified white carbon black.

[0013] White carbon black added to silica gel has a reinforcing effect on silica gel and increases the mechanical properties of silica gel, but it is easy to agglomerate in silica gel, and the texture of the formed silica gel is uneven. The present invention uses allyl glycidyl ether to open the ring and then chlorinate, and then modify the white carbon black so that it can be evenly dispersed in the silica gel, thereby increasing the strength and durability of the silica gel. The possible reason is that the ether bonds and double bonds added to the surface of the modified white carbon black increase the dispersibility of the modified white carbon black, and the ether bonds increase the skin-friendliness of the silica gel, so it can be used whether it is directly in contact with the skin as a breast patch or as a bra component.

[0014] In some embodiments, in step 1), the mass ratio of allyl glycidyl ether to thionyl chloride is 1:(0.5-0.7).

[0015] In some embodiments, the mass ratio of the compound to white carbon black in step 2) is (0.5-0.6):1.

[0016] The present invention limits the mass ratio of allyl glycidyl ether to thionyl chloride so that the allyl glycidyl ether after ring opening can be fully chlorinated, and further limits the mass ratio of the compound to white carbon black so that the compound can be fully grafted onto the surface of the white carbon black, thereby increasing the skin affinity of the silica gel and preventing the durability of the silica gel from decreasing due to too many ether bonds.

[0017] In some embodiments, the method for preparing the second vinyl silicone oil comprises the following steps:

[0018] (1) adding acrylic acid and azobisisobutyronitrile to vinyl silicone oil, stirring at 70-80° C. for 1-2 hours to obtain modified vinyl silicone oil;

[0019] (2) Add pentaerythritol triacrylate and sulfuric acid to the modified vinyl silicone oil, stir at 70-80° C. for 5-6 hours, extract and dry to obtain the second vinyl silicone oil.

[0020] The present invention firstly utilizes acrylic acid to modify vinyl silicone oil so that carboxyl groups are grafted onto the vinyl silicone oil, and then utilizes the carboxyl groups to react with hydroxyl groups of pentaerythritol triacrylate, thereby increasing the double bonds of the obtained second vinyl silicone oil and forming a network structure. During the vulcanization process, the first vinyl silicone oil, modified white carbon black and vinyl MQ silicone resin are cross-linked to increase the density of the silicone. The punched silicone pad still has high mechanical properties and will not be easily deformed in the case of high-speed rotary washing in a washing machine, thus having a good reinforcing effect. Meanwhile, the second vinyl silicone oil reduces the glass transition temperature of the silicone to a certain extent, thus having good processability, increasing the softness and moisture absorption and perspiration discharge of the breast pad, and increasing the air permeability of the breast pad.

[0021] In some embodiments, the viscosity of the vinyl silicone oil at 25° C. is 9000-15000 mPa·s.

[0022] The present invention limits the viscosity of the vinyl silicone oil so that the silicone has good fluidity during the curing process, and the prepared silicone has appropriate strength, is soft and has certain support.

[0023] In some embodiments, the mass ratio of acrylic acid to vinyl silicone oil is (0.2-0.4):1.

[0024] In some embodiments, the mass ratio of pentaerythritol triacrylate to modified vinyl silicone oil in step (2) is (0.7-0.9):1.

[0025] The present invention allows carboxyl groups to be grafted onto vinyl silicone oil by limiting the mass ratio of acrylic acid to vinyl silicone oil. Meanwhile, the mass ratio of pentaerythritol triacrylate to modified vinyl silicone oil is adjusted to avoid a reduction in crosslinking points and a decrease in the strength of silica gel due to consumption of a portion of double bonds by grafted carboxyl groups. Meanwhile, the presence of the ester group can form a coordination effect with the foaming agent, so that the foaming agent can be evenly dispersed and foamed, thereby reducing the weight of the breast pad.

[0026] In some embodiments, the hydrogen content of the hydrogen-containing silicone oil is 15-20%.

[0027] The invention limits the hydrogen content of hydrogen-containing silicone oil so that the silicone has higher strength and will not be oxidized under the sun's exposure to cause a decrease in elasticity.

[0028] A second aspect of the present invention provides a method for preparing a porous breathable breast pad, comprising the following steps:

[0029] S1. Add modified white carbon black to the first vinyl silicone oil and stir at 60-70° C. for 30-60 min. Cool to room temperature and then add dimethyl silicone oil, vinyl MQ silicone resin, catalyst and foaming agent and continue stirring for 1-2 h to obtain component A.

[0030] S2, mixing the second vinyl silicone oil, hydrogen-containing silicone oil and the inhibitor and stirring for 1-2 hours to obtain component B;

[0031] S3, mixing component A obtained in step S1 and component B obtained in step S2, stirring at room temperature for 30-60 min, adding into a mold, vulcanizing and forming at a vulcanizing temperature of 150-160° C. for 50-60 min, and cooling to room temperature to obtain a silicone breast pad body;

[0032] S4. Use a punching die to punch holes in the silicone breast pad body obtained in step S3 to make ventilation holes, thereby obtaining a porous and breathable breast pad.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The present invention modifies white carbon black and vinyl silicone oil, and then uses two-component silicone rubber to prepare a silicone breast pad. The obtained breast pad has good mechanical properties, a wide range of applications, a small weight, and a high degree of comfort.

[0035] 2. The present invention performs ring opening of allyl glycidyl ether followed by chlorination and then modifies white carbon black so that it can be dispersed evenly in silica gel, thereby increasing the strength and durability of silica gel. Meanwhile, the ether bond increases the skin affinity of silica gel, and the silica gel can be used as a breast patch or as a bra component in direct contact with the skin.

[0036] 3. The present invention firstly utilizes acrylic acid to modify vinyl silicone oil so as to graft carboxyl groups onto the vinyl silicone oil, and then utilizes the carboxyl groups to react with the hydroxyl groups of pentaerythritol triacrylate to increase the double bonds of the obtained second vinyl silicone oil and form a network structure at the same time. During the vulcanization process, the first vinyl silicone oil, modified white carbon black and vinyl MQ silicone resin are cross-linked to increase the density of the silicone. The punched silicone pad still has high mechanical properties. The prepared breast pad will not be easily deformed even when washed in a washing machine at high speed, and has a good reinforcing effect. At the same time, the second vinyl silicone oil reduces the glass transition temperature of the silicone to a certain extent, has good processability, increases the softness and moisture absorption and perspiration of the breast pad, and increases the air permeability of the breast pad. DETAILED DESCRIPTION

[0037] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following examples and comparative examples are only used to illustrate the present invention and are not intended to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0038] In order to facilitate those skilled in the art to implement the present invention, some raw materials and manufacturers of the embodiments and comparative examples are described as follows:

[0039] The compounds and related reagents used in the following examples and comparative examples can all be purchased from the market, among which the first vinyl silicone oil was purchased from Shanghai Nha Trang New Material Technology Co., Ltd. with a viscosity of 20,000 mPa·s (25°C); the vinyl silicone oil was purchased from Shanghai Nha Trang New Material Technology Co., Ltd. with a viscosity of 10,000 mPa·s (25°C); dimethyl silicone oil was purchased from Shandong Juneng Chemical Co., Ltd., model PMX-500; hydrogen-containing silicone oil was purchased from Shenzhen Jipeng Silicon Fluoride Materials Co., Ltd., with a hydrogen content of 1.6%; vinyl MQ silicone resin was purchased from Jining Tangyi Chemical Co., Ltd., model JP-KMD5202; and white carbon black was purchased from Jining Tangyi Chemical Co., Ltd., model Wacker N20.

[0040] Preparation Example 1

[0041] The preparation method of modified silica-1 comprises the following steps:

[0042] 1) Add 10 g of allyl glycidyl ether and 1 g of sodium hydroxide to 100 ml of dioxane, react at 75° C. for 5.5 h, cool to room temperature, add 6 g of thionyl chloride while stirring, react at 0° C. for 4 h, and rotary evaporate to obtain a compound;

[0043] 2) Under nitrogen protection, 5.5 g of the compound obtained in step 1), 10 g of white carbon black and 1 g of 4-dimethylaminopyridine were added to 100 ml of dichloromethane, stirred at 30° C. for 36 h, filtered and washed to obtain modified white carbon black-1.

[0044] Preparation Example 2

[0045] The preparation method of modified white carbon black-2 has the same specific steps as Preparation Example 1, except that the amount of thionyl chloride added is 4 g.

[0046] Preparation Example 3

[0047] The preparation method of modified silica-3 has the same specific steps as Preparation Example 1, except that the amount of the compound added in step 2) is 7 g.

[0048] Preparation Example 4

[0049] The preparation method of the second vinyl silicone oil-A comprises the following steps:

[0050] (1) Add 3 g of acrylic acid and 0.01 g of azobisisobutyronitrile to 10 g of vinyl silicone oil and stir at 75° C. for 1.5 h to obtain modified vinyl silicone oil;

[0051] (2) 8 g of pentaerythritol triacrylate and 5 ml of 85 wt % sulfuric acid were added to 10 g of modified vinyl silicone oil, stirred at 75° C. for 5.5 h, extracted and dried to obtain the second vinyl silicone oil-A.

[0052] Preparation Example 5

[0053] The preparation method of the second vinyl silicone oil-B has the same specific steps as Preparation Example 4, except that the amount of acrylic acid added is 5 g.

[0054] Preparation Example 6

[0055] The preparation method of the second vinyl silicone oil-C has the same specific steps as those of Preparation Example 4, except that the amount of pentaerythritol triacrylate added is 10 g.

[0056] Preparation Example 7

[0057] The preparation method of the second vinyl silicone oil-D has the same specific steps as those of Preparation Example 4, except that the vinyl silicone oil is replaced by the first vinyl silicone oil in equal amounts.

[0058] Example 1

[0059] A porous breathable breast pad comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 21 parts of a first vinyl silicone oil, 10 parts of dimethyl silicone oil, 38 parts of modified white carbon black-1, 40 parts of vinyl MQ silicone resin, 0.015 parts of chloroplatinic acid catalyst, and 1.5 parts of zinc carbonate; and the component B comprises the following raw materials in parts by weight: 60 parts of a second vinyl silicone oil-A, 39 parts of hydrogen-containing silicone oil, and 4 parts of ethynyl cyclohexanol.

[0060] The method for preparing the porous breathable breast pad in this embodiment comprises the following steps:

[0061] S1, adding modified silica-1 to the first vinyl silicone oil and stirring at 65°C for 45 minutes, cooling to room temperature, adding dimethyl silicone oil, vinyl MQ silicone resin, chloroplatinic acid catalyst, and zinc carbonate and continuing stirring for 1-2 hours to obtain component A;

[0062] S2, mixing the second vinyl silicone oil-A, hydrogen-containing silicone oil and ethynyl cyclohexanol and stirring for 1.5 hours to obtain component B;

[0063] S3, mixing component A obtained in step S1 and component B obtained in step S2, stirring at room temperature for 45 minutes, adding into a mold, vulcanizing and forming at a vulcanizing temperature of 155° C. for 55 minutes, and cooling to room temperature to obtain a silicone breast pad body;

[0064] S4. Use a punching die to punch holes in the silicone breast pad body obtained in step S3 to make ventilation holes, thereby obtaining a porous and breathable breast pad.

[0065] Example 2

[0066] A porous breathable breast pad comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 20 parts of a first vinyl silicone oil, 9 parts of dimethyl silicone oil, 37 parts of modified white carbon black-1, 38 parts of vinyl MQ silicone resin, 0.01 parts of chloroplatinic acid catalyst, and 1 part of zinc carbonate; and the component B comprises the following raw materials in parts by weight: 58 parts of a second vinyl silicone oil-A, 38 parts of hydrogen-containing silicone oil, and 0.03 parts of ethynyl cyclohexanol.

[0067] The method for preparing the porous breathable breast pad in this embodiment comprises the following steps:

[0068] S1, adding modified silica-1 to the first vinyl silicone oil and stirring at 60°C for 60 minutes, cooling to room temperature, adding dimethyl silicone oil, vinyl MQ silicone resin, chloroplatinic acid catalyst, and zinc carbonate and continuing stirring for 1 hour to obtain component A;

[0069] S2, mixing the second vinyl silicone oil-A, hydrogen-containing silicone oil and inhibitor and stirring for 1 hour to obtain component B;

[0070] S3, mixing component A obtained in step S1 and component B obtained in step S2, stirring at room temperature for 30 minutes, then adding into a mold, vulcanizing and forming, the vulcanizing temperature is 150° C., the vulcanizing time is 60 minutes, and cooling to room temperature to obtain a silicone breast pad body;

[0071] S4. Use a punching die to punch holes in the silicone breast pad body obtained in step S3 to make ventilation holes, thereby obtaining a porous and breathable breast pad.

[0072] Example 3

[0073] A porous breathable breast pad comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by weight: 22 parts of a first vinyl silicone oil, 12 parts of dimethyl silicone oil, 39 parts of modified white carbon black-1, 41 parts of vinyl MQ silicone resin, 0.02 parts of chloroplatinic acid catalyst, and 2 parts of zinc carbonate; and the component B comprises the following raw materials in parts by weight: 61 parts of a second vinyl silicone oil-A, 40 parts of hydrogen-containing silicone oil, and 0.05 parts of ethynyl cyclohexanol.

[0074] The method for preparing the porous breathable breast pad in this embodiment comprises the following steps:

[0075] S1, adding modified silica-1 to the first vinyl silicone oil and stirring at 70°C for 30 minutes, cooling to room temperature, adding dimethyl silicone oil, vinyl MQ silicone resin, chloroplatinic acid catalyst, and zinc carbonate and continuing stirring for 2 hours to obtain component A;

[0076] S2, mixing the second vinyl silicone oil-A, hydrogen-containing silicone oil and inhibitor and stirring for 2 hours to obtain component B;

[0077] S3, mixing component A obtained in step S1 and component B obtained in step S2, stirring at room temperature for 60 minutes, adding into a mold, vulcanizing and forming at a vulcanizing temperature of 160° C. for 50 minutes, and cooling to room temperature to obtain a silicone breast pad body;

[0078] S4. Use a punching die to punch holes in the silicone breast pad body obtained in step S3 to make ventilation holes, thereby obtaining a porous and breathable breast pad.

[0079] Example 4

[0080] A porous breathable breast pad and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified silica-1 is replaced by modified silica-2.

[0081] Example 5

[0082] A porous breathable breast pad and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified silica-1 is replaced by modified silica-3.

[0083] Example 6

[0084] A porous breathable breast pad and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of the second vinyl silicone oil-A is replaced by the second vinyl silicone oil-B.

[0085] Example 7

[0086] A porous breathable breast pad and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of the second vinyl silicone oil-A is replaced by a second vinyl silicone oil-C.

[0087] Example 8

[0088] A porous breathable breast pad and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of the second vinyl silicone oil-A is replaced by the second vinyl silicone oil-D.

[0089] Comparative Example 1

[0090] A porous breathable breast pad and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of modified silica-1 is replaced by silica.

[0091] Comparative Example 2

[0092] A porous breathable breast pad and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of the second vinyl silicone oil-A is replaced by vinyl silicone oil.

[0093] Performance Testing

[0094] 1. Mechanical properties

[0095] The tear strength of the silicone breast pad body prepared in each embodiment and comparative example was tested with reference to GB / T 528-2009.

[0096] 2. Foaming density

[0097] The foaming density of the silicone breast pad body prepared in each embodiment and comparative example was tested with reference to GB / T 6343-2009.

[0098] 3. Washability

[0099] The breast pads prepared in each embodiment and comparative example were put into a standard washing test machine and washed 10 times according to the 5A washing test standard. The 5A washing test standard is washing at 60° C. for 1 hour. Five consecutive washes are counted as one time. The breast pads are washed and dried once. After 10 times, the breast pads are observed for cracking and falling off.

[0100] The test results are shown in Table 1.

[0101] Table 1

[0102]

[0103] By comparing the data of Examples 1-3 in Table 1, it can be seen that the porous breathable breast pad of the present invention still has high tear strength, foaming density and excellent washability; by comparing Example 4 with Example 1, it can be seen that the change in the ratio of allyl glycidyl ether to thionyl chloride will lead to insufficient reaction of allyl glycidyl ether after ring opening, resulting in reduced tear strength of the breast pad; by comparing Example 5 with Example 1, it can be seen that the change in the ratio of the compound to white carbon black leads to a change in the number of ether bonds in the silica gel, and the tear strength and washability of the breast pad decrease; by comparing Example 6 with Example 1, it can be seen that the change in the ratio of acrylic acid to vinyl silicone oil leads to a change in the crosslinking degree of the silica gel. The tear strength and wash resistance of the breast pad decrease. By comparing Example 7 with Example 1, it can be seen that the ratio of pentaerythritol triacrylate to modified vinyl silicone oil is changed, resulting in a high crosslinking degree of the silicone and a decrease in various properties of the breast pad. By comparing Example 8 with Example 1, it can be seen that the viscosity of the vinyl silicone oil in the second vinyl silicone oil is changed, resulting in a change in the softness of the silicone, and the tear strength and wash resistance are both decreased. By comparing Comparative Example 1 with Example 1, it can be seen that directly using white carbon black is prone to uneven distribution, and the tear strength and wash resistance of the breast pad are decreased. By comparing Comparative Example 2 with Example 1, it can be seen that directly using vinyl silicone oil causes various properties of the breast pad to decrease.

[0104] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A porous breathable breast pad, characterized in that: The invention comprises component A and component B, wherein component A comprises the following raw materials in parts by weight: 20-22 parts of a first vinyl silicone oil, 9-12 parts of dimethyl silicone oil, 37-39 parts of modified white carbon black, 38-41 parts of vinyl MQ silicone resin, 0.01-0.02 parts of a catalyst, and 1-2 parts of a foaming agent; and component B comprises the following raw materials in parts by weight: 58-61 parts of a second vinyl silicone oil, 38-40 parts of hydrogen-containing silicone oil, and 0.03-0.05 parts of an inhibitor.

2. The porous breathable chest pad according to claim 1, characterized in that: The preparation method of the modified white carbon black comprises the following steps: 1) Add allyl glycidyl ether and sodium hydroxide to dioxane, react at 70-80°C for 5-6h, cool to room temperature, add thionyl chloride while stirring, react at 0-5°C for 3-5h, and rotary evaporate to obtain a compound; 2) Under the protection of inert gas, the compound obtained in step 1), white carbon black and 4-dimethylaminopyridine are added to dichloromethane, stirred at 25-35° C. for 35-37 hours, filtered and washed to obtain modified white carbon black.

3. The porous breathable chest pad according to claim 2, characterized in that: In the step 1), the mass ratio of allyl glycidyl ether to thionyl chloride is 1:(0.5-0.7).

4. The porous breathable chest pad according to claim 2, characterized in that: In the step 2), the mass ratio of the compound to white carbon black is (0.5-0.6):

1.

5. The porous breathable chest pad according to claim 1, characterized in that: The preparation method of the second vinyl silicone oil comprises the following steps: (1) adding acrylic acid and azobisisobutyronitrile to vinyl silicone oil, stirring at 70-80° C. for 1-2 hours to obtain modified vinyl silicone oil; (2) Add pentaerythritol triacrylate and sulfuric acid to the modified vinyl silicone oil, stir at 70-80° C. for 5-6 hours, extract and dry to obtain the second vinyl silicone oil.

6. The porous breathable chest pad according to claim 5, characterized in that: The viscosity of the vinyl silicone oil at 25° C. is 9000-15000 mPa·s.

7. The porous breathable chest pad according to claim 5, characterized in that: The mass ratio of the acrylic acid to the vinyl silicone oil is (0.2-0.4):

1.

8. The porous breathable chest pad according to claim 5, characterized in that: In the step (2), the mass ratio of pentaerythritol triacrylate to modified vinyl silicone oil is (0.7-0.9):

1.

9. The porous breathable breast pad according to claim 1, characterized in that: The hydrogen content of the hydrogen-containing silicone oil is 1.5-1.8%.

10. A method for preparing the porous breathable breast pad according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Add modified white carbon black to the first vinyl silicone oil and stir at 60-70° C. for 30-60 min. Cool to room temperature and then add dimethyl silicone oil, vinyl MQ silicone resin, catalyst and foaming agent and continue stirring for 1-2 h to obtain component A. S2, mixing the second vinyl silicone oil, hydrogen-containing silicone oil and the inhibitor and stirring for 1-2 hours to obtain component B; S3, mixing component A obtained in step S1 and component B obtained in step S2, stirring at room temperature for 30-60 min, adding into a mold, vulcanizing and forming at a vulcanizing temperature of 150-160° C. for 50-60 min, and cooling to room temperature to obtain a silicone breast pad body; S4. Use a punching die to punch holes in the silicone breast pad body obtained in step S3 to make ventilation holes, thereby obtaining a porous and breathable breast pad.

Images