A breast patch material for lactation and its use

Abstract

The present application relates to the technical field of high polymer materials, especially to the field of IPC C08L51, further to a breast-feeding chest patch material and application thereof, wherein the raw materials include 97-99.5% of polymer and 0.5-3% of auxiliary agent by weight percentage. The breast-feeding chest patch prepared by the present application has good air permeability, good softness and high comfort, and meets the use requirements of women during lactation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to the field of IPC C08L51, and further relates to a breast pad material for lactation period and application thereof. BACKGROUND

[0002] The female lactation period is a special period, and the breast is different from usual. Breastfeeding can cause the breast to present different shapes and sizes at different stages before and after lactation. With the emphasis on the quality of life, combined with the need for breastfeeding during lactation, women usually choose to buy breastfeeding bras instead of ordinary bras during lactation. However, the breastfeeding bra is prone to the following problems: sponge yellowing; shoulder straps are easy to loosen; milk spills out of the sponge and is easy to harden; without sponge, it is not wrapped; uncomfortable fabric; too thick; easy to loosen the lower circumference; insufficient aesthetic appearance, etc.

[0003] Chinese patent CN 105885392 A discloses a bra pad made of PU soft glue. The selected raw materials include: polyether polyurethane resin, wherein, diphenyl methane diisocyanate (MDI), polyether polyol, butanediol, catalyst, cyclopentane physical foaming agent; the "PU soft glue" is injected into the mold with a temperature of 50-55℃ to form once. The "PU soft glue" used in the present application simulates the skin feeling, and the bra pad is formed by a mold once, which saves a lot of manpower and material resources and improves the efficiency. However, the addition of the foaming agent in the above technical solution may cause allergic reactions in some people during use. Chinese patent CN 114702815 A discloses a breast sponge bra cup material. Specific polyether polyol, diphenyl methane diisocyanate, and dimethyl silicone oil are used in combination to prepare a breast sponge bra cup material with high resilience and fine and uniform bubble holes. However, the breast sponge bra cup material prepared by the technical solution inevitably has the problems of easy deformation after washing and poor durability. SUMMARY

[0004] The purpose of the present application is to provide a breast pad material for lactation period and application thereof. The breast pad material for lactation period prepared by the present application has good air permeability, good softness, and high comfort, and meets the use requirements of women during lactation period.

[0005] The first aspect of the present application provides a breast pad material for lactation period. The raw materials include 97-99.5% of a polymer and 0.5-3% of an additive, by weight percentage.

[0006] In some preferred embodiments, the polymer is selected from one or more combinations of SEBS (hydrogenated styrene-butadiene block copolymer), OBC (olefin block copolymer), and silicone rubber.

[0007] Preferably, the polymer is SEBS.

[0008] Preferably, the SEBS has a styrene molar content of 13-28%.

[0009] Preferably, the SEBS has a styrene molar content of 13%.

[0010] The present inventors have found that when the polymer is SEBS and the SEBS has a styrene molar content of 13%, not only can the hardness of the breast pad for lactation be effectively reduced, but also the processing performance of the breast pad for lactation material can be improved. The present inventors speculate that since SEBS is a saturated styrene-based elastomer obtained by hydrogenation, the polystyrene hard segment in the SEBS molecular chain contains benzene rings and has greater rigidity and poorer mobility; the ethylene-butene soft segment molecular chain is a carbon straight chain with side chains and has high flexibility; the breast pad for lactation prepared using SEBS with a lower styrene content has lower hardness; in addition, the SEBS with a lower styrene content has a lower relative molecular mass and does not cause the molecular chain to be difficult to stretch due to the molecular chain being too long, and has good compatibility with the auxiliary agent in the system, thus effectively improving the processing performance, but if the styrene content is too low, the mechanical properties of the breast pad for lactation will be affected and the service life will be reduced.

[0011] Preferably, the SEBS has a melt flow rate of 10-15 g / 10 min (230°C, 2.16 kg).

[0012] In some preferred embodiments, the auxiliary agent is selected from one or more combinations of PTFE (polytetrafluoroethylene), zinc oxide, montmorillonite, titanium dioxide, calcium carbonate, white carbon black, and talc powder.

[0013] Preferably, the auxiliary agent is PTFE.

[0014] The present inventors have found that when the auxiliary agent is PTFE, not only can the deformation degree of the breast pad for lactation be reduced, but also the foaming capacity of the breast pad for lactation material can be improved. The present inventors speculate that PTFE plays a supporting role in the breast pad for lactation material, reduces the movement of the SEBS chain segment, and reduces irreversible deformation; in addition, PTFE has many nanoscale pores, and in the foaming process, gas can diffuse into these pores, causing the PTFE particles to swell and increase in volume; in the pressure relief process, the PTFE particles are split into multiple nanoscale small particles, the presence of the nanoparticles increases the nucleation points and enhances the foaming capacity; the presence of the PTEF particles can also effectively limit the growth of the cells, avoiding cell rupture and resulting in a breast pad for lactation with a regular appearance.

[0015] Preferably, the PTFE has a particle size of 2-10 μm.

[0016] In some preferred embodiments, the weight ratio of the SEBS to the PTFE is (99-99.8):(0.2-1).

[0017] Preferably, the weight ratio of the SEBS and PTFE is (99.4-99.6):(0.4-0.6).

[0018] The present inventors have found that by controlling the weight ratio of the SEBS and PTFE to be (99.4-99.6):(0.4-0.6), the mechanical properties of the breast pad for lactation can be ensured while the density is reduced and the softness and comfort are improved. The present inventors speculate that since the PTFE is split into multiple nano-sized particles during foaming, the presence of the nano-particles increases the density of the breast pad for lactation, resulting in reduced softness. By controlling the weight ratio of the SEBS and PTFE to be (99.4-99.6):(0.4-0.6), the breast pad for lactation prepared thereby does not have reduced softness due to excessively high density, and has good mechanical properties, thereby improving the service life of the breast pad for lactation.

[0019] The application of the breast pad material for lactation to prepare a breast pad for lactation.

[0020] In some preferred embodiments, the method for preparing the breast pad for lactation comprises the following steps:

[0021] (1) uniformly mixing the polymer and the auxiliary agent and then granulating by a double screw rod;

[0022] (2) injecting the particles obtained in step (1) at an injection temperature of 230-270°C to prepare a breast pad embryo;

[0023] (3) placing the breast pad embryo obtained in step (2) into an autoclave for foaming, introducing N2 or CO2, controlling the pressure to be 15-60 MPa and the temperature to be 90-160°C, maintaining the pressure and temperature for 2-6 h, then releasing the pressure, and taking out and baking in an oven at 90-110°C for 20-40 min to obtain the breast pad for lactation.

[0024] Preferably, the rotation speed of the double screw rod in step (1) is 100-300 r / min.

[0025] Preferably, the parameters of the double screw extruder in step (1) are as follows: the feeding zone is at 90-100°C, the mixing section is at 210-230°C, the compression section is at 190-210°C, and the die head is at 190-200°C.

[0026] Preferably, the pressure in step (3) is 42 MPa, the temperature is 120°C, and the pressure and temperature maintaining time is 6 h.

[0027] Preferably, the pressure releasing time in step (3) is 1-60 s.

[0028] The present inventors found that when the pressure in the control step (3) is 42 MPa, the temperature is 120 DEG C, and the holding time is 6 h, the density of the breast pad for lactation prepared can be effectively reduced, the softness is improved, and the broken hole phenomenon is avoided.The present inventors speculate that with the increase of the temperature and the pressure, the diffusion speed of the gas is accelerated, the gas enters the breast pad for lactation material faster, the gas swells fully, when the pressure is rapidly released, the bubble holes formed are larger and more, the density is reduced, and the micropore structure of the breast pad for lactation prepared is more regular, and the hole profile is more obvious.However, if the pressure and the temperature are too high, the bubble hole growth is uneven, the pore size distribution is uneven, and even the broken hole phenomenon occurs.

[0029] Beneficial effects:

[0030] 1. When the polymer is SEBS with a styrene molar content of 13%, the SEBS with a lower styrene content is used to prepare the breast pad for lactation, the hardness is lower, and in addition, the relative molecular mass of the SEBS with a lower styrene content is lower, the molecular chain is not too long to stretch, the compatibility with the auxiliary agent in the system is good, and the processing performance is effectively improved.

[0031] 2. PTFE is selected as the auxiliary agent in the present application, the PTFE plays a supporting role in the breast pad for lactation material, reduces the movement of the SEBS chain segment, and reduces the irreversible deformation; in addition, the PTFE has many nanoscale holes, in the foaming process, the gas can diffuse into these holes, so that the swelling volume of the PTFE particles is increased; in the pressure release process, the PTFE particles are split into multiple nanoscale small particles, the nucleation points are increased, and the foaming capacity is enhanced; the existence of the PTEF particles can also effectively limit the bubble hole growth, avoid the bubble hole rupture, and make the breast pad for lactation have a regular appearance.

[0032] 3. In the present application, the PTFE is split into multiple nanoscale small particles in the foaming process, the existence of the nanoparticles can increase the density of the breast pad for lactation, reduce the softness, the weight ratio of EBS and PTFE is controlled to be 99.7:0.3, so that the breast pad for lactation prepared will not have a reduced softness due to the too high density, and the breast pad for lactation can also have good mechanical properties and improve the service life of the breast pad for lactation.

[0033] 4. In the present application, the pressure in the breast pad sub-embryo foaming process is 42 MPa, the temperature is 120 DEG C, and the holding time is 6 h, the gas swells fully, when the pressure is rapidly released, the bubble holes formed are larger and more, the density is reduced, and the micropore structure of the breast pad for lactation prepared is more regular, and the hole profile is more obvious. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1A breast patch material for lactation period is prepared according to the breast patch material for lactation period. DETAILED DESCRIPTION

[0035] Example 1

[0036] Example 1 provides a breast patch material for lactation period, the raw materials include, by weight percentage: 99.5% polymer and 0.5% auxiliary agent.

[0037] The polymer is SEBS.

[0038] The melt flow rate of the SEBS is 13 g / 10 min (230℃, 2.16 kg); the styrene molar content of the SEBS is 13%, model: Kraton MD1646.

[0039] The auxiliary agent is PTFE.

[0040] The particle size of the PTFE is 4±1 μm, purchased from Tepda New Material Co., Ltd., model: TPD-505SA.

[0041] The preparation method of the breast patch for lactation period includes the following steps:

[0042] (1) the polymer and the auxiliary agent are uniformly mixed and then granulated by a double screw rod;

[0043] (2) the particles obtained in step (1) are injection molded at an injection molding temperature of 250℃ to form a breast patch embryo;

[0044] (3) the breast patch embryo obtained in step (2) is placed in an autoclave for foaming, N2 is introduced, the pressure is controlled at 42 MPa, the temperature is 120℃, the pressure holding time is 6 h, then the pressure is released, and the breast patch for lactation period is obtained after baking in a 100℃ oven for 30 min.

[0045] The rotation speed of the double screw rod in step (1) is 200 r / min.

[0046] The parameters of the double screw extruder in step (1) are: the feeding zone is 100℃, the mixing section is 220℃, the compression section is 200℃, and the head is 195℃.

[0047] The pressure release time in step (3) is 30 s.

[0048] Example 2

[0049] Example 2 provides a breast patch material for lactation period, the raw materials include, by weight percentage: 99.6% polymer and 0.4% auxiliary agent.

[0050] The polymer is SEBS.

[0051] The melt flow rate of the SEBS is 13 g / 10 min (230℃, 2.16 kg); the styrene molar content of the SEBS is 13%, model: Kortec MD1646.

[0052] The auxiliary agent is PTFE.

[0053] The particle size of the PTFE is 4±1 μm, purchased from Taipuda New Material Co., Ltd., model: TPD-505SA.

[0054] The preparation method of the breast patch for lactation period includes the following steps:

[0055] (1) uniformly mixing the polymer and the auxiliary agent, and then granulating by double screw rod;

[0056] (2) injecting the particles obtained in step (1) at an injection temperature of 250℃ to form a breast patch embryo;

[0057] (3) placing the breast patch embryo obtained in step (2) into an autoclave for foaming, introducing N2 or CO2, controlling the pressure to be 42 MPa and the temperature to be 120℃, maintaining the pressure and temperature for 6 h, then releasing the pressure, and taking out to be baked in a 100℃ oven for 30 min, to obtain the breast patch for lactation period.

[0058] The rotation speed of the double screw rod in step (1) is 200 r / min.

[0059] The parameters of the double screw extruder in step (1) are as follows: the feeding zone is 100℃, the mixing section is 220℃, the compression section is 200℃, and the head is 195℃.

[0060] The pressure releasing time in step (3) is 30 s.

[0061] Example 3

[0062] Example 3 provides a breast patch material for lactation period, and the raw materials include, by weight percentage: 99.4% polymer and 0.6% auxiliary agent.

[0063] The polymer is SEBS.

[0064] The melt flow rate of the SEBS is 13 g / 10 min (230℃, 2.16 kg); the styrene molar content of the SEBS is 13%, model: Kortec MD1646.

[0065] The auxiliary agent is PTFE.

[0066] The particle size of the PTFE is 4±1 μm, purchased from Taipuda New Material Co., Ltd., model: TPD-505SA.

[0067] The preparation method of the breast patch for lactation period comprises the following steps:

[0068] (1) uniformly mixing the polymer and the additive and then granulating by a double screw rod;

[0069] (2) injection molding the particles obtained in step (1) at an injection molding temperature of 250 ℃ to prepare a breast patch embryo;

[0070] (3) placing the breast patch embryo obtained in step (2) into an autoclave for foaming, introducing N2, controlling the pressure to be 42 MPa and the temperature to be 120 ℃, maintaining the pressure and the temperature for 6 h, then releasing the pressure, and taking out and baking in a 100 ℃ oven for 30 min to obtain the breast patch for lactation period.

[0071] In step (1), the rotation speed of the double screw rod is 200 r / min.

[0072] In step (1), the parameters of the double screw extruder are as follows: the feeding zone is 100 ℃, the mixing section is 220 ℃, the compression section is 200 ℃, and the head is 195 ℃.

[0073] In step (3), the pressure releasing time is 30 s.

[0074] Example 4

[0075] Example 4 provides a breast patch material for lactation period, and the raw materials include, by weight percentage, 98.5% polymer and 1.5% additive.

[0076] The polymer is SEBS.

[0077] The melt flow rate of the SEBS is 13 g / 10 min (230 ℃, 2.16 kg); the styrene molar content of the SEBS is 13%, and the model number is Korten MD1646.

[0078] The additive is PTFE.

[0079] The particle size of the PTFE is 4±1 μm, which is purchased from Taipuda New Material Co., Ltd., and the model number is TPD-505SA.

[0080] The preparation method of the breast patch for lactation period comprises the following steps:

[0081] (1) uniformly mixing the polymer and the additive and then granulating by a double screw rod;

[0082] (2) injection molding the particles obtained in step (1) at an injection molding temperature of 250 ℃ to prepare a breast patch embryo;

[0083] (3) the breast patch blank obtained in step (2) is placed in an autoclave for foaming, N2 is introduced, the pressure is controlled at 42 MPa, the temperature is 120°C, the pressure maintaining and heating time is 6h, then pressure relief, and the obtained product is taken out and baked in a 100°C oven for 30min, to obtain the breast patch for lactation.

[0084] The rotating speed of the double screw in step (1) is 200r / min.

[0085] The parameters of the double screw extruder in step (1) are: 100°C for the feeding zone, 220°C for the mixing section, 200°C for the compression section, and 195°C for the die head.

[0086] The pressure relief time in step (3) is 30s.

[0087] Example 5

[0088] Example 5 provides a breast patch material for lactation, which has the same specific implementation as Example 1, except that the melt flow rate of the SEBS is <1g / 10min (230°C, 2.16kg); and the styrene molar content of the SEBS is 30%, model: Kraton G1652.

[0089] Example 6

[0090] Example 6 provides a breast patch material for lactation, which has the same specific implementation as Example 1, except that PTFE is replaced by calcium carbonate, which is purchased from Guangxi Xinkaimei Industry Co., Ltd.

[0091] Example 7

[0092] Example 7 provides a breast patch material for lactation, which has the same specific implementation as Example 1, except that the preparation method of the breast patch for lactation comprises the following steps:

[0093] (1) the polymer and the auxiliary agent are mixed uniformly and then granulated by a double screw;

[0094] (2) the granules obtained in step (1) are injection molded at an injection temperature of 250°C to obtain a breast patch blank;

[0095] (3) the breast patch blank obtained in step (2) is placed in an autoclave for foaming, N2 is introduced, the pressure is controlled at 65 MPa, the temperature is 120°C, the pressure maintaining and heating time is 6h, then pressure relief, and the obtained product is taken out and baked in a 100°C oven for 30min, to obtain the breast patch for lactation.

[0096] The rotating speed of the double screw in step (1) is 200r / min.

[0097] The parameters of the double screw extruder in step (1) are: 100°C for the feeding zone, 220°C for the mixing section, 200°C for the compression section, and 195°C for the head.

[0098] The pressure relief time in step (3) is 30 s.

[0099] Example 8

[0100] Example 8 provides a breast pad material for lactation, the specific implementation of which is the same as that of Example 1, except that the preparation method of the breast pad for lactation comprises the following steps:

[0101] (1) uniformly mixing the polymer and the auxiliary agent and then granulating by a double screw;

[0102] (2) injection molding the particles obtained in step (1) at an injection temperature of 250°C to form a breast pad embryo;

[0103] (3) placing the breast pad embryo obtained in step (2) into an autoclave for foaming, introducing N2, controlling the pressure to be 42 MPa and the temperature to be 170°C, maintaining the pressure and temperature for 6 h, then releasing the pressure, and taking out and baking in a 100°C oven for 30 min to obtain the breast pad for lactation.

[0104] The rotation speed of the double screw in step (1) is 200 r / min.

[0105] The parameters of the double screw extruder in step (1) are: 100°C for the feeding zone, 220°C for the mixing section, 200°C for the compression section, and 195°C for the head.

[0106] The pressure relief time in step (3) is 30 s.

[0107] Performance test:

[0108] 1. Density test: the density of the breast pad for lactation prepared in Examples 1-8 was tested according to the ISO 2781 standard.

[0109] 2. Hardness test: the hardness of the breast pad for lactation prepared in Examples 1-8 was tested according to the TM 205 standard.

[0110] Test results:

[0111] Table 1:

[0112] Density (kg / m 3 )]]> Hardness Example 1 38 2C Example 2 35 2C Example 3 38 2C Example 4 40 4C Example 5 55 8C Example 6 40 4C Example 7 30 1C Example 8 28 /

Claims

1. A breast patch for lactation, characterized by, The raw materials include a polymer and an auxiliary agent by weight percentage; The polymer is SEBS, and the styrene molar content of the SEBS is 13%; The auxiliary agent is PTFE, and the weight ratio of the SEBS and the PTFE is (99.4-99.6):(0.4-0.6); The preparation method of the breast pad for lactation period includes the following steps: (1) uniformly mixing the polymer and the auxiliary agent and then granulating by a double-screw rod; (2) injecting the particles obtained in step (1) at an injection temperature of 230-270 ℃ to prepare a breast pad embryo; (3) placing the breast pad embryo obtained in step (2) into an autoclave for foaming, introducing N2 or CO2, controlling the pressure to be 42 MPa and the temperature to be 120 ℃, maintaining the pressure and the temperature for 6 h, then releasing the pressure, taking out, baking in an oven at 90-110 ℃ for 20-40 min, and thus obtaining the breast pad for lactation period.

2. The breast pad for lactation according to claim 1, characterized by The particle size of the PTFE is 2-10 µm.

3. The method of preparing the breast patch for lactation according to claim 1, characterized in that, The preparation method includes the following steps: (1) uniformly mixing the polymer and the auxiliary agent and then granulating by a double-screw rod; (2) injecting the particles obtained in step (1) at an injection temperature of 230-270 ℃ to prepare a breast pad embryo; (3) placing the breast pad embryo obtained in step (2) into an autoclave for foaming, introducing N2 or CO2, controlling the pressure to be 42 MPa and the temperature to be 120 ℃, maintaining the pressure and the temperature for 6 h, then releasing the pressure, taking out, baking in an oven at 90-110 ℃ for 20-40 min, and thus obtaining the breast pad for lactation period.

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