Silica gel smearing part, preparation process thereof and packaging hose

Abstract

The invention discloses a silica gel smearing part, a preparation process thereof and a packaging hose. The silica gel smearing part is applied to the packaging hose, and the processing problems that metal smearing parts and ceramic smearing parts in existing products are prone to causing allergic reactions for individual special constitutions, the material cost is high, the mold processing period is long, and the reject ratio is high are solved; the silica gel packaging hose has the advantages of being simple in structure, short in mold development period, high in machining efficiency, low in production cost and the like, the problem possibly caused by a traditional packaging hose is solved, meanwhile, the product cost can be reduced, and the silica gel packaging hose has high market competitiveness.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging hoses, and in particular relates to a silicone gel coating portion, a preparation process thereof, and a packaging hose. Background Art

[0002] Currently, the skin-contacting application section of packaging hoses sold on the market is often made of metal, ceramic, powder metallurgy, silicone, or a fully plastic material integrally molded with the tube head, resulting in a poor consumer experience. When designing facial packaging hoses, due to material limitations in the application area, designers often consider curved surfaces to ensure the application section conforms closely to the curves of the face for a snug fit. However, metal application sections only provide a cooling sensation, resulting in a poor fit. Contact between metal, ceramic, or plastic application sections and the face, eyes, or lips of some consumers can also cause allergic reactions, leading to complaints.

[0003] Packaging hoses with silicone applicators offer excellent skin-friendliness and can effectively address the issue of poor applicability. However, due to the inherent properties of silicone, it reacts with pastes containing small molecule oils, causing swelling, whitening, and embrittlement. Consequently, silicone packaging hoses have a limited service life. Due to these issues, the urgent need to develop a silicone gel that adheres perfectly to the skin and remains unreactive even when exposed to pastes of different materials, and to apply it to packaging hoses, has become a research priority for packaging hose technicians. Summary of the Invention

[0004] To overcome the shortcomings and drawbacks of existing technologies, the primary objective of this invention is to provide a process for preparing a silicone gel applicator. This silicone gel is skin-friendly, soft, and resistant to various creams, resolving the skin allergy issues that can occur in some consumers when metal or ceramic applicator tubes are used in existing packaging.

[0005] The second object of the present invention is to provide a silicone gel coating portion prepared by the above preparation process.

[0006] A third object of the present invention is to provide a silicone gel packaging hose.

[0007] The primary purpose of the present invention is achieved through the following technical solutions: A preparation process of a silicone gel coating portion comprises the following steps: (1) Through vacuum negative pressure and heating softening process, the thermoplastic polyurethane elastomer (TPU) is adsorbed into the mold cavity to form a thermoplastic polyurethane elastomer (TPU) cavity; (2) Filling the thermoplastic polyurethane elastic (hereinafter referred to as: TPU) cavity with silicone gel, at which time the silicone gel is in a fluid state, adjusting the pressure and temperature of the equipment, and starting the vulcanization, at which time the silicone gel gradually changes from a liquid state to a semi-liquid-semi-solid state, and the contact surface between the silicone gel and the silicone gel forms a physical crosslink to form a silicone gel-TPU cavity, wherein the silicone gel is a mixture of terminal hydroxyl polydimethylsiloxane, hydrogenated silicone oil and vinyl triethoxysilane; (3) A silicone stent is prepared using silicone, and the silicone gel-TPU cavity is encapsulated to prepare a silicone gel coating portion.

[0008] Preferably, the vacuum negative pressure in step (1) is -0.25~-0.1MPa; the temperature of the heating softening process is 50~80°C; and the thickness of the thermoplastic polyurethane elastomer (TPU) cavity is 0.1-0.5mm.

[0009] Preferably, the mass ratio of the terminal hydroxyl polydimethylsiloxane to the hydrogen-containing silicone oil in step (2) is 1:1 or 10:1; the added mass of the vinyl triethoxysilane is 0.5-2% of the mixture of the terminal hydroxyl polydimethylsiloxane and the hydrogen-containing silicone oil.

[0010] Preferably, the pressure in step (2) is 0.1-0.5 MPa, and the temperature is 90-120°C.

[0011] Preferably, the hardness of the silicone gel-TPU cavity in step (2) is 1 to 40 degrees.

[0012] Preferably, the hardness of the silicone bracket in step (3) is 40-70 degrees.

[0013] The second object of the present invention is achieved by the following technical solutions: A silicone gel smear part is prepared by the above preparation process.

[0014] Preferably, the silicone gel application portion includes a silicone gel-TPU cavity and a silicone bracket, the silicone gel-TPU cavity includes a TPU film and silicone gel, and the TPU film is wrapped around the outside of the silicone gel; the silicone gel-TPU cavity is arranged on the silicone bracket.

[0015] Preferably, a first discharge port is further provided in the middle of the silicone gel-TPU cavity, and a channel connected to the first discharge port is provided on the silicone bracket.

[0016] The third object of the present invention is achieved through the following technical solutions: A silicone gel packaging hose comprises an outer cover, a silicone gel smear portion, a fastening middle sleeve and a container body. The fastening middle sleeve fixes the silicone gel smear portion on the container body. The silicone gel smear portion is non-detachably connected to the container body, and the outer cover is detachably connected to the silicone gel smear portion.

[0017] Preferably, a sealing needle is vertically arranged inside the outer cover, and the needle head of the sealing needle faces the discharge port. A first mounting buckle line is arranged inside the outer cover near the opening, and the outer cover is connected to the fastening middle sleeve buckle through the first mounting buckle line.

[0018] Preferably, the silicone support has a support platform, and the support platform cooperates with the top of the container.

[0019] Preferably, the fastening middle sleeve includes a first snap-in position, a first stop tooth, a second mounting buckle line and a through hole; the first snap-in position is arranged on the upper part of the fastening middle sleeve, and the first snap-in position is connected to the first mounting buckle line of the outer cover, the first stop tooth is arranged inside the fastening middle sleeve, and the through hole is arranged in the middle of the fastening middle sleeve.

[0020] Preferably, the container body includes a second discharge port, a second stop tooth, a second snap-fit ​​position and a container cavity; the second discharge port is arranged at the upper part of the container, and a second stop tooth is provided on the upper part of the outer wall of the second discharge port, the second stop tooth is engaged with the first stop tooth, and a second snap-fit ​​position is provided on the lower part of the outer wall of the second discharge port, and the second mounting buckle line position cooperates with the second snap-fit ​​position.

[0021] The working principle of the present invention is as follows: The preparation process of the silicone gel coating portion described in the present invention preferably adopts a layered structure design based on the characteristics of TPU and silicone gel materials. The TPU film is adsorbed into the mold cavity by vacuum negative pressure and heating softening parameter setting. At this time, the TPU film will adhere to the surface of the mold according to the shape of the cavity to form a TPU cavity; further, after the TPU film forms the cavity, the negative pressure is converted into positive pressure, and the parameter is set to 0.1-0.5MPa. The TPU cavity is filled with a mixture of end-hydroxy polydimethylsiloxane, hydrogen-containing silicone oil and vinyl triethoxysilane. As the filling begins, the silicone gel will undergo a self-leveling effect and fill the entire TPU cavity of the mold; after the filling is completed, the temperature is increased, and the silicone gel will be vulcanized within the set temperature (90-120°C) to form a silicone gel-TPU cavity. During this entire preparation process, the molecular chain of polyurethane, the main material of the TPU film, contains carbamate groups. These groups are polar and can interact with polar groups such as silanol groups on the silicon surface of the filler (silicone gel) through hydrogen bonds, thereby achieving adhesion. In addition, the soft segment of TPU is usually composed of polyester or polyether, which is flexible and fluid. During the heating process, the silicone gel vulcanizes and reacts with the TPU film at the same time to form physical crosslinks (silanol groups (Si-OH) and carbamate groups (-NHCOO-) do not spontaneously crosslink under normal conditions), but limited interfacial coupling occurs under specific catalysts (vinyltriethoxysilane) or high temperature environments, mainly forming a hydrogen bond, but the interfacial bonding force is <1MPA). Since the silicone gel is in a semi-solid-semi-liquid state, if it is subjected to external pressure, it will cause the silicone gel to overflow. Therefore, after the silicone gel is filled, the required filling surface is encapsulated to prevent the silicone gel from overflowing when squeezed by external force. The base used for packaging uses silicone with a higher hardness. The so-called packaging is to make the soft silicone gel maintain its shape and not be squeezed out. Since both materials are silicone, no additional adhesive is needed for bonding. Through vulcanization reaction, the TPU film, soft silicone gel, and hard silicone can be formed into a whole, becoming one part, namely the silicone gel coating part.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects: (1) There are no similar reports on the preparation process of the silicone gel coating portion described in the present invention in the domestic packaging, cosmetics, pharmaceutical, and oral care fields; (2) The preparation process of the silicone gel application part of the present invention is applicable to massage and skin contact product structures with special shapes, such as massage heads and eye cream heads, and is applicable to a wider range of products due to its simple structure. The surface hardness of the product containing the silicone gel application part can be as low as 1-40 degrees. Due to the product characteristics of the silicone gel itself, it has a cooling feeling, and the TPU film is compatible with a variety of creams, solving the problems of swelling, whitening, and brittleness caused by the silicone material. (3) The silicone gel coating part developed by the preparation process of the present invention can be developed into a special shape according to the actual needs of the product. Except for the external mold, other equipment can be shared. In addition, the mold structure is simple, the development cycle is short, and the cost is low, so new products can be launched faster to seize market share; (4) The silicone gel coating part developed by the preparation process of the present invention has a hardness as low as 1-40 degrees, which can achieve a skin-friendly effect on the biological curves of lips, eyes, cheeks, etc., and is conducive to the uniform application of the paste on the skin surface, and the user experience is excellent.

[0023] (5) The silicone gel coating part of the present invention is applied to the packaging hose to solve the processing problems of the metal and ceramic coating parts in existing products that easily cause allergic reactions to some special physiques, as well as high material costs, long mold processing cycles, and high defect rates. Furthermore, the silicone gel coating part of the present invention takes into account the cool feeling of the metal / ceramic head and the rapid heat conduction of the gel. (6) The silicone gel packaging hose of the present invention has the advantages of simple structure, short mold development cycle, high processing efficiency, low production cost, etc. It can solve the problems that may be caused by traditional packaging hoses while reducing product costs and has strong market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a flow chart of the preparation process of the silicone gel coating part; Figure 2 This is a structural diagram of the silicone gel packaging hose; Figure 3 for Figure 2 AA cross-sectional structural diagram; Figure 4 This is a structural diagram of the outer cover; Figure 5 for Figure 4 BB cross-sectional structure diagram; Figure 6 This is a structural diagram of the silicone gel application part; Figure 7 for Figure 6 CC cross-sectional structure diagram; Figure 8 This is a structural diagram for fastening the middle sleeve; Figure 9 for Figure 8 DD cross-sectional structure diagram; Figure 10 It is a structural diagram of the container body; Figure 11 for Figure 10 EE cross-sectional structure diagram; Figure 12 This is an assembly diagram of the silicone gel application portion and the container body; Figure 13 for Figure 12 FF cross-sectional structure diagram; Figure 14 This is an assembly diagram for fastening the middle sleeve, silicone gel application part and container body.

[0025] Among them, 1-outer cover, 11-sealing needle, 12-first mounting buckle line position; 2-silicone gel application part, 21-silicone gel-TPU cavity, 211-TPU film, 212-silicone gel, 213-first discharge port, 22-silicone bracket, 221-bracket platform; 3-fastening middle sleeve, 31-first buckle position, 32-first anti-rotation tooth, 33-second mounting buckle line position, 34-through hole; 4-hose, 41-second discharge port, 42-second anti-rotation tooth, 43-second buckle position, 44-container cavity. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto. The materials used in the examples of the present invention can all be purchased commercially.

[0027] Example 1 to Example 5 like Figure 1 As shown, the preparation process of the silicone gel coating portion described in Examples 1 to 5 includes the following steps: (1) Through a vacuum negative pressure and heating softening process, a thermoplastic polyurethane elastomer (TPU) is adsorbed into a mold cavity to form a thermoplastic polyurethane elastomer (TPU) cavity; the vacuum negative pressure is -0.25 to -0.1 MPa; the thickness of the thermoplastic polyurethane elastomer (TPU) cavity is 0.1 to 0.5 mm; the temperature of the heating softening process is 50 to 80°C; (2) A mixture of end-hydroxy polydimethylsiloxane, hydrogenated silicone oil and vinyl triethoxysilane (silicone gel) is filled into the thermoplastic polyurethane elastomer (TPU) cavity. Due to the self-leveling effect of the silicone gel, the TPU cavity is completely filled. At the same time, the negative pressure is converted into positive pressure, and the temperature is increased to vulcanize within the set temperature to form a silicone gel-TPU cavity. The mass ratio of the end-hydroxy polydimethylsiloxane and hydrogenated silicone oil is 1:1 or 10:1. The added mass of the vinyl triethoxysilane is 0.5-2% of the mixture of end-hydroxy polydimethylsiloxane and hydrogenated silicone oil. The set temperature is 50-80°C to prevent the liquid silicone gel from solidifying prematurely, resulting in failure to fill the TPU cavity. After the filling is completed, the temperature is increased to 90-120°C, and the negative pressure is adjusted to positive pressure, and the positive pressure is 0.1-0.5MPa. The surface hardness of the silicone gel-TPU cavity is 1-40 degrees. In this step, the terminal hydroxyl polydimethylsiloxane, hydrogenated silicone oil and vinyl triethoxysilane are fully mixed by a planetary mixer. At this time, vacuum degassing is required in the container to discharge the hydrogen generated after mixing. The temperature needs to be controlled between 50-80°C to prevent the silicone gel from solidifying prematurely and being in a semi-solid-semi-liquid state, which is not easy to fill. After the silicone gel is filled, the silicone gel has a self-leveling effect. After filling the cavity, the mold continues to heat up at a rate of 5°C / minute. At the same time, the original negative pressure state of the mold is adjusted to a positive pressure state. The parameters are set to: 0.1MPa-0.5Mpa. The mold maintains a high temperature and high pressure cross-linked vulcanization state. At this time, the silicone gel shows that the silanol polar groups form weak hydrogen bonds with the carbamate polar groups in the TPU film. At the microscopic level, physical cross-linking bonds the two together. At this time, the mold maintains a high-temperature, high-pressure cross-linked vulcanization state, and the vinyl triethoxysilane (VTES) added to the silicone gel will migrate to the surface; (3) Liquid silicone is used to prepare a silicone bracket to encapsulate the silicone gel-TPU cavity to prepare a silicone gel coating part. The specific preparation steps of the silicone bracket are to process the liquid silicone into a silicone bracket through the LSR injection molding process, with a surface hardness of 40-70HRC. The silicone base is transferred to a vulcanization environment, and the Si-OH on the surface reacts with vinyl triethoxysilane to produce a chemical reaction, thereby achieving a sealing and bonding effect. The chemical reaction formula is: Si-OH+Si-OC2H5→Si-O-Si+C2H5OHSi-OH+Si-OCX2HX5Si-O-Si+CX2HX5OH.

[0028] Table 1 below shows the process parameters for preparing the silicone gel coating portion described in Examples 1 to 5.

[0029] Table 1

[0030] The silicone gel coating prepared by the process described in Examples 1 to 5 has the following advantages: (1) The physical cross-linking between the TPU film and the silicone gel is formed by utilizing the characteristics of different materials; the chemical bonding between the silicone gel, TPU film and the silicone bracket is stable and reliable; reducing the instability caused by glue bonding or glue overflow contamination of the contents of the packaging hose; (2) After the vulcanization process, the silicone gel is in a semi-solid-semi-liquid state, and the softness reaches 1-40 degrees; (3) After the TPU film undergoes the vulcanization process, there will be a hard layer on the surface of the TPU film while the soft layer inside does not undergo any reaction. This characteristic of the TPU film makes the TPU film not easy to be punctured while being soft.

[0031] Example 6 like Figures 2 to 3 As shown, the silicone gel packaging hose described in this embodiment includes an outer cover 1, a silicone gel application part 2, a fastening middle sleeve 3 and a container body 4. The fastening middle sleeve 3 fixes the silicone gel application part 2 on the container body 4, and the silicone gel application part 2 is detachably connected to the container body 4. The outer cover 1 is detachably connected to the silicone gel application part 2.

[0032] like Figures 4 and 5 As shown, a sealing needle 11 is vertically provided inside the outer cover 1, with the needle head of the sealing needle 11 facing the discharge port. A first mounting buckle line 12 is provided inside the outer cover 1 near the opening. The outer cover 1 is connected to the first buckle position 31 of the fastening sleeve 3 via the first mounting buckle line position 12. The material of the outer cover 1 is not limited to plastic, and can also be metal, or an outer cover structure formed by a combination of two or more materials.

[0033] like Figures 6 and 7 As shown, the silicone gel application part 2 includes a silicone gel-TPU cavity 21 and a silicone bracket 22, the silicone gel-TPU cavity 21 includes a TPU film 211 and silicone gel 212, and the TPU film is wrapped around the outside of the silicone gel; the silicone gel-TPU cavity 21 is set on the silicone bracket 22.

[0034] Preferably, a first discharge port 213 is further provided in the middle of the silicone gel-TPU cavity 21 , and a channel connected to the first discharge port 213 is provided on the silicone bracket 22 .

[0035] Preferably, the silicone bracket 22 has a bracket platform 221 , and the bracket platform 221 cooperates with the upper portion of the container body 4 .

[0036] like Figures 8 and 9As shown, the fastening middle sleeve 3 includes a first snap-in position 31, a first stop tooth 32, a second installation buckle line position 33 and a through hole 34; the first snap-in position is arranged at the upper part of the fastening middle sleeve 3, and the first snap-in position 31 is connected to the first installation buckle line position 12 of the outer cover 1, the first stop tooth 32 is arranged inside the fastening middle sleeve 3, and the through hole is arranged in the middle of the fastening middle sleeve 3.

[0037] like Figures 10 and 11 As shown, the container body 4 includes a second discharge port 41, a second stop tooth 42, a second snap position 43 and a container cavity 44; the second discharge port 41 is provided at the upper part of the container cavity 44, and the upper part of the outer wall of the second discharge port 41 is provided with a second stop tooth 42, which engages with the first stop tooth 32, and the lower part of the outer wall of the second discharge port 41 is provided with a second snap position 43, and the second installation buckle line position 33 of the fastening sleeve cooperates with the second snap position 43 on the container body 4. The cooperation between the fastening sleeve 3 and the container body 4 is not limited to buckle lines, and other fastening methods such as threads can also be used; like Figures 12 to 13 The figure shows the assembly of the silicone gel coating portion 2 and the container body 4. The silicone gel coating portion 2 is pressed into the second discharge port 41 of the container body 4. At this time, the side of the silicone bracket 22 and the side wall of the second discharge port 41 have an interference fit, which acts as a seal. After assembly, the bracket platform 221 is in contact with the topmost plane of the container body 4. like Figure 14 As shown, the fastening middle sleeve 3 is pressed into the assembly of the silicone gel coating part 2 and the container body 4 by pressing. At this time, the first anti-rotation tooth 32 in the fastening middle sleeve 3 cooperates with the second anti-rotation tooth 42 in the container body to prevent the fastening middle sleeve from rotating, and the second buckle position 42 cooperates with the second installation buckle line 33 to prevent the fastening middle sleeve 3 from falling out; at this time, the top surface of the bracket platform 221 on the silicone bracket 22 is completely fitted with the inner wall plane of the fastening middle sleeve 3. Due to the softness of silicone, it is completely fitted with the platform of the container body 4 and the inner plane of the fastening middle sleeve 3, thereby achieving a second seal. Afterwards, the outer cover 1 is installed into the assembly of the silicone gel coating part 2, the fastening middle sleeve 3 and the container body 4 by snapping together. At this time, the first installation buckle line position 12 cooperates with the first snap position 31 to fix the outer cover 1; at the same time, the sealing needle 11 of the outer cover 1 is inserted into the first discharge port 213 of the silicone gel coating part 2. At this time, due to the softness of the silicone gel coating part 2, an interference fit is formed with the side of the sealing needle 11, thereby achieving the final seal.

[0038] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A preparation process for a silicone gel coating portion, characterized in that: The following steps are included: (1) Through vacuum negative pressure and heating softening process, TPU is adsorbed into the mold cavity to form a TPU cavity; (2) Filling the TPU cavity with silicone gel, at which point the silicone gel is in a fluid state, adjusting the pressure and temperature of the equipment, and starting vulcanization. At this point, the silicone gel gradually changes from a liquid state to a semi-liquid-semi-solid state, and the contact surface between the silicone gel and the silicone gel forms a physical crosslink to form a silicone gel-TPU cavity. The silicone gel is a mixture of terminal hydroxyl polydimethylsiloxane, hydrogenated silicone oil, and vinyl triethoxysilane; (3) A silicone stent is prepared using silicone, and the silicone gel-TPU cavity is encapsulated to prepare a silicone gel coating portion.

2. The process for preparing the silicone gel coating portion according to claim 1, wherein: The vacuum negative pressure in step (1) is -0.25~-0.1MPa; the temperature of the heating and softening process is 50~80℃; and the thickness of the TPU cavity is 0.1-0.5mm.

3. The preparation process of the silicone gel coating portion according to claim 1, characterized in that: In step (2), the mass ratio of the terminal hydroxyl polydimethylsiloxane to the hydrogen-containing silicone oil is 1:1 or 10:1; the added mass of the vinyl triethoxysilane is 0.5-2% of the mixture of the terminal hydroxyl polydimethylsiloxane and the hydrogen-containing silicone oil; the pressure is 0.1-0.5 MPa, and the temperature is 90-120°C.

4. A silicone gel application portion, characterized in that: Prepared by the preparation process described in any one of claims 1 to 3; the silicone gel application part includes a silicone gel-TPU cavity and a silicone bracket, the silicone gel-TPU cavity includes a TPU film and silicone gel, and the TPU film is wrapped around the outside of the silicone gel; the silicone gel-TPU cavity is arranged on the silicone bracket.

5. The silicone gel application portion according to claim 4, characterized in that: A first discharge port is further provided in the middle of the silicone gel-TPU cavity, and a channel connected to the first discharge port is provided on the silicone bracket.

6. A silicone gel packaging hose, characterized in that: It comprises an outer cover, the silicone gel smear part according to any one of claims 5 or 6, a fastening middle sleeve and a container body, wherein the fastening middle sleeve fixes the silicone gel smear part on the container body, the silicone gel smear part is non-detachably connected to the container body, and the outer cover is detachably connected to the silicone gel smear part.

7. The silicone gel packaging hose according to claim 6, characterized in that: A sealing needle is vertically arranged inside the outer cover, and the needle head of the sealing needle faces the discharge port. A first mounting buckle line is arranged inside the outer cover near the opening, and the outer cover is connected to the fastening middle sleeve buckle through the first mounting buckle line.

8. The silicone gel packaging hose according to claim 6, characterized in that: The silica gel support has a support platform, and the support platform is matched with the top of the container.

9. The silicone gel packaging hose according to claim 6, characterized in that: The fastening middle sleeve includes a first snap-in position, a first anti-rotation tooth, a second mounting buckle line and a through hole; the first snap-in position is arranged at the upper part of the fastening middle sleeve, and the first snap-in position is connected to the first mounting buckle line of the outer cover, the first anti-rotation tooth is arranged inside the fastening middle sleeve, and the through hole is arranged in the middle of the fastening middle sleeve.

10. The silicone gel packaging hose according to claim 6, wherein the container body includes a second discharge port, a second stop tooth, a second snap-fit ​​position and a container cavity; the second discharge port is arranged at the upper part of the container, and a second stop tooth is arranged on the upper part of the outer wall of the second discharge port, the second stop tooth is engaged with the first stop tooth, and a second snap-fit ​​position is arranged on the lower part of the outer wall of the second discharge port, and the second mounting buckle line position cooperates with the second snap-fit ​​position.

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