Hot melt adhesive for infant navel paste, preparation method therefor, and infant navel paste comprising same

Abstract

Disclosed are a hot melt adhesive for an infant navel paste, a preparation method therefor, and an infant navel paste comprising same, which relate to the technical field of medical instruments. The hot melt adhesive for the infant navel paste mainly comprises a thermoplastic copolymer, mineral oil, tackifying resin, cellulose, an anti-inflammatory substance, and an antioxidant. The mass ratio of the thermoplastic copolymer to the tackifying resin to the cellulose is (10-20):(20-30):(20-50). It is found by means of long-term test research that the hot melt adhesive obtained from the thermoplastic copolymer, the tackifying resin, and the cellulose at the above mass ratio has good application viscosity and proper stripping force under the condition of 35-40 °C, and the hot melt adhesive can be used as an infant navel paste to achieve the technical effects of good application performance, free pain, and tear susceptibility. Meanwhile, the hot melt adhesive also contains the anti-inflammatory substance, and the used raw materials have no allergic irritation, so that the hot melt adhesive for the infant navel paste of the present application also has good anti-inflammatory and anti-allergic effects.

Description

Hot melt adhesive for baby navel patch, preparation method thereof, and baby navel patch containing same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority and rights to the Chinese patent application with patent application number 202410266740.3 filed with the State Intellectual Property Office of China on March 8, 2024, entitled “Hot melt adhesive for baby navel stickers, preparation method thereof and baby navel stickers containing the same”, and incorporates the entire text of the same into this application by reference. Technical Field

[0003] The present application relates to the technical field of medical devices, and in particular to a hot melt adhesive for a baby navel patch, a preparation method thereof, and a baby navel patch containing the hot melt adhesive. Background Art

[0004] Newborns often use belly button patches after their umbilical cords are cut to prevent infection. In long-term clinical practice, doctors apply these patches to children's abdomens using medical tape. These patches can easily rub off due to the child's movements. Existing belly button patches often contain adhesives like rubber glue, which can cause allergic reactions to delicate baby skin, leading to redness, swelling, and inflammation. Furthermore, the anti-inflammatory drugs in existing belly button patches can evaporate and become ineffective over time.

[0005] Therefore, it is necessary and urgent to research and develop a baby navel patch that has good applicability, is painless and easy to tear, and has good anti-inflammatory and anti-allergic effects under the condition of human body temperature (35-40°C).

[0006] In view of this, this application is hereby filed.

[0007] Summary of the Invention

[0008] The first purpose of the present application is to provide a hot melt adhesive for baby navel patches, which has good application viscosity and appropriate peeling force at 35-40°C. Using it as a hot melt adhesive for baby navel patches can achieve the technical effects of good application, painless and easy tearing.

[0009] The second purpose of the present application is to provide a method for preparing hot melt adhesive for baby umbilical cord stickers.

[0010] The third purpose of the present application is to provide a baby navel patch, the sol layer of which is mainly prepared from the above-mentioned hot melt adhesive for baby navel patches.

[0011] In order to achieve the above-mentioned purpose of this application, the following technical solutions are specially adopted:

[0012] The present application provides a hot melt adhesive for a baby umbilical cord patch, wherein the hot melt adhesive is mainly prepared from a thermoplastic copolymer, mineral oil, a tackifying resin, cellulose, an anti-inflammatory substance, and an antioxidant, wherein:

[0013] The mass ratio of the thermoplastic copolymer, the tackifying resin and the cellulose is 10-20:20-30:20-50.

[0014] Further, the thermoplastic copolymer is at least one of styrene-isoprene block copolymer (SIS), styrene-butadiene block copolymer (SBS), hydrogenated styrene-isoprene block copolymer (SEPS), and hydrogenated styrene-butadiene block copolymer (SEBS);

[0015] Preferably, the thermoplastic copolymer is obtained by compounding styrene-isoprene block copolymer (SIS) and hydrogenated styrene-butadiene block copolymer (SEBS), and the weight ratio of the styrene-isoprene block copolymer (SIS) to the hydrogenated styrene-butadiene block copolymer is 10-15:5.

[0016] Furthermore, the tackifying resin is at least one of rosin resin, hydrogenated rosin resin, C5 petroleum resin, C9 petroleum resin, and C5 / C9 copolymer resin, preferably C5 or C9 petroleum resin.

[0017] Furthermore, the cellulose is at least one of methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl cellulose (HEC), and carboxymethyl cellulose (CMC).

[0018] Furthermore, the anti-inflammatory substance is an ion bactericide;

[0019] The ion bactericide includes silver ion bactericide, copper ion bactericide and zinc ion bactericide, and is preferably zirconium phosphate silver-loaded inorganic antibacterial powder.

[0020] Furthermore, the mineral oil is naphthenic oil or white mineral oil;

[0021] The antioxidant is a hindered phenol antioxidant, and the hindered phenol antioxidant is one or both of BASF antioxidant RGanox B225 and 2,6-di-tert-butyl-4-methylphenol.

[0022] Furthermore, the hot melt adhesive comprises, by weight:

[0023] 10-20 parts of thermoplastic copolymer, 5-10 parts of mineral oil, 20-30 parts of tackifying resin, 20-50 parts of cellulose, 1-10 parts of anti-inflammatory substance, and 0.1-0.5 parts of antioxidant.

[0024] The present application provides a method for preparing the hot melt adhesive for infant umbilical cord stickers, the method comprising:

[0025] (A) heating and melting a portion of the tackifying resin, mineral oil, and an antioxidant to mix uniformly to obtain an intermediate A;

[0026] (B) adding a thermoplastic copolymer to the intermediate A and heating and stirring until melted, then adding the remaining tackifying resin and heating and stirring until melted, and then adding cellulose and an anti-inflammatory substance and heating and stirring until melted, to obtain an intermediate B;

[0027] (C) cooling the intermediate B to obtain a hot melt adhesive for baby navel patch;

[0028] The heating and melting temperature of step (A) and step (B) in the preparation process is 140-145°C.

[0029] Furthermore, the tackifying resin in step (A) is 40% of the total mass of the tackifying resin;

[0030] The tackifying resin added in step (B) is 60% of the total mass of the tackifying resin;

[0031] The step (B) is prepared under negative pressure pumping conditions.

[0032] The present application provides a baby navel patch, which includes a backing layer and a sol layer; the sol layer is mainly prepared from the hot melt adhesive used for the baby navel patch.

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

[0034] The hot melt adhesive for baby navel patches provided in this application is mainly prepared from thermoplastic copolymers, mineral oil, tackifying resins, cellulose, anti-inflammatory substances and antioxidants, wherein the mass ratio of the thermoplastic copolymer, tackifying resin and cellulose is 10-20:20-30:20-50. After long-term experimental research, the applicant found that the hot melt adhesive obtained by configuring the mass ratio of the above-mentioned thermoplastic copolymer, tackifying resin and cellulose has good application viscosity and appropriate peeling force under the conditions of 35-40°C. Using it as a hot melt adhesive for baby navel patches can achieve the technical effects of good application, painless and easy tearing. At the same time, the hot melt adhesive of this application also contains anti-inflammatory substances, and the raw materials used are non-allergic and irritating. Therefore, the hot melt adhesive for baby navel patches in this application also has good anti-inflammatory and anti-allergic effects.

[0035] This application provides a method for preparing a hot-melt adhesive for baby navel patches. This method first heats and melts a portion of a tackifying resin with mineral oil and an antioxidant, mixing them uniformly. Subsequently, a thermoplastic copolymer, the remaining tackifying resin, cellulose, and an anti-inflammatory substance are added. This step-by-step preparation method effectively improves the compatibility of the hot-melt adhesive components, resulting in a stable hot-melt adhesive for baby navel patches. Furthermore, this method is simple to operate and easily scalable.

[0036] The baby navel patch provided herein has a sol layer primarily prepared from the aforementioned hot melt adhesive for baby navel patches. Due to the properties of the aforementioned hot melt adhesive for baby navel patches, the baby navel patch has good adhesion, is painless, and is easy to tear at temperatures between 35 and 40°C, and also exhibits excellent anti-inflammatory and anti-allergic effects. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions of this application in conjunction with the embodiments. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0038] According to one aspect of the present application, a hot melt adhesive for a baby umbilical cord patch is provided, wherein the hot melt adhesive is mainly prepared from a thermoplastic copolymer, mineral oil, a tackifying resin, cellulose, an anti-inflammatory substance, and an antioxidant, wherein:

[0039] The mass ratio of the thermoplastic copolymer, the tackifying resin and the cellulose is 10-20:20-30:20-50.

[0040] The hot melt adhesive for baby navel patches provided in this application is mainly prepared from thermoplastic copolymers, mineral oil, tackifying resins, cellulose, anti-inflammatory substances and antioxidants, wherein the mass ratio of the thermoplastic copolymer, tackifying resin and cellulose is 10-20:20-30:20-50. After long-term experimental research, the applicant found that the hot melt adhesive obtained by configuring the mass ratio of the above-mentioned thermoplastic copolymer, tackifying resin and cellulose has good application viscosity and appropriate peeling force under the conditions of 35-40°C. Using it as a hot melt adhesive for baby navel patches can achieve the technical effects of good application, painless and easy tearing. At the same time, the hot melt adhesive of this application also contains anti-inflammatory substances, and the raw materials used are non-allergic and irritating. Therefore, the hot melt adhesive for baby navel patches in this application also has good anti-inflammatory and anti-allergic effects.

[0041] In a preferred embodiment of the present application, the thermoplastic copolymer is at least one of styrene-isoprene block copolymer (SIS), styrene-butadiene block copolymer (SBS), hydrogenated styrene-isoprene block copolymer (SEPS), and hydrogenated styrene-butadiene block copolymer (SEBS);

[0042] In the above preferred embodiment, the thermoplastic copolymer is obtained by compounding a styrene-isoprene block copolymer (SIS) and a hydrogenated styrene-butadiene block copolymer (SEBS), and the weight ratio of the styrene-isoprene block copolymer (SIS) to the hydrogenated styrene-butadiene block copolymer (SEBS) is 10 to 15:5.

[0043] As a preferred embodiment, the thermoplastic copolymer obtained by compounding the above-mentioned SIS and SEBS in a weight ratio of 10 to 15:5 is used to prepare the hot melt adhesive for baby umbilical cord stickers in this application, which has good conformability, good sweat resistance, and antibacterial and anti-inflammatory effects.

[0044] In a preferred embodiment of the present application, the tackifying resin is at least one of rosin resin, hydrogenated rosin resin, C5 petroleum resin, C9 petroleum resin, and C5 / C9 copolymer resin, preferably C5 or C9 petroleum resin.

[0045] As a preferred embodiment, the present application uses C5 or C9 petroleum resin as a tackifying resin which is non-irritating to the skin, and the hot melt adhesive for baby navel patches prepared using the same has a good skin-friendly effect.

[0046] In a preferred embodiment of the present application, the cellulose is at least one of methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl cellulose (HEC), and carboxymethyl cellulose (CMC).

[0047] In a preferred embodiment of the present application, the anti-inflammatory substance is an ionic bactericide;

[0048] The ion bactericide includes silver ion bactericide, copper ion bactericide and zinc ion bactericide, and is preferably zirconium phosphate silver-loaded inorganic antibacterial powder.

[0049] As a preferred embodiment, the zirconium phosphate silver-loaded inorganic antibacterial powder used in this application has a technical effect of high temperature resistance and can withstand high temperatures of 1300°C. Compared with existing antibacterial drugs, it is more conducive to the preparation of hot melt adhesive for baby umbilical cord stickers.

[0050] The preparation method of the zirconium phosphate silver-loaded inorganic antibacterial powder comprises the following steps: using an ion exchange method to prepare zirconium phosphate into nano-level zirconium phosphate silver-loaded inorganic antibacterial powder under acidic conditions, and controlling the crystal particle size by using ethylene glycol and polyethylene glycol; and then baking to obtain a zirconium phosphate silver-loaded inorganic antibacterial powder product with a certain moisture content and uniform shape. The prepared zirconium phosphate silver-loaded inorganic antibacterial powder has the characteristics of strong antibacterial ability and excellent stability at high temperatures.

[0051] Preferably, the zirconium phosphate silver-loaded inorganic antibacterial powder of the present application is prepared by the preparation method in Example 1 of CN100345486C.

[0052] In a preferred embodiment of the present application, the mineral oil is naphthenic oil or white mineral oil;

[0053] The antioxidant is a hindered phenol antioxidant, and the hindered phenol antioxidant is one or both of BASF antioxidant RGanox B225 and 2,6-di-tert-butyl-4-methylphenol.

[0054] In a preferred embodiment of the present application, the hot melt adhesive comprises, by weight:

[0055] 10-20 parts of thermoplastic copolymer, 5-10 parts of mineral oil, 20-30 parts of tackifying resin, 20-50 parts of cellulose, 1-10 parts of anti-inflammatory substance, and 0.1-0.5 parts of antioxidant.

[0056] According to one aspect of the present application, a method for preparing the hot melt adhesive for baby umbilical cord stickers comprises:

[0057] (A) heating and melting a portion of the tackifying resin, mineral oil, and an antioxidant to mix uniformly to obtain an intermediate A;

[0058] (B) adding a thermoplastic copolymer to the intermediate A and heating and stirring until melted, then adding the remaining tackifying resin and heating and stirring until melted, and then adding cellulose and an anti-inflammatory substance and heating and stirring until melted, to obtain an intermediate B;

[0059] (C) cooling the intermediate B to obtain a hot melt adhesive for baby navel patch;

[0060] The heating and melting temperature of step (A) and step (B) in the preparation process is 140-145°C.

[0061] This application provides a method for preparing a hot-melt adhesive for baby navel patches. This method first heats and melts a portion of a tackifying resin with mineral oil and an antioxidant, mixing them uniformly. Subsequently, a thermoplastic copolymer, the remaining tackifying resin, cellulose, and an anti-inflammatory substance are added. This step-by-step preparation method effectively improves the compatibility of the hot-melt adhesive components, resulting in a stable hot-melt adhesive for baby navel patches. Furthermore, this method is simple to operate and easily scalable.

[0062] In a preferred embodiment of the present application, the tackifying resin in step (A) accounts for 40% of the total mass of the tackifying resin; and the tackifying resin added in step (B) accounts for 60% of the total mass of the tackifying resin.

[0063] In a preferred embodiment of the present application, the preparation in step (B) is carried out under negative pressure pumping conditions.

[0064] As a preferred embodiment, step (B) is prepared under negative pressure exhaust conditions, which is beneficial to increasing the probability that each component does not contain unsaturated bonds, thereby improving the bonding performance and weather resistance of the resulting hot melt adhesive.

[0065] According to one aspect of the present application, a baby navel patch comprises a backing layer and a sol layer; the sol layer is mainly prepared from the hot melt adhesive for the baby navel patch.

[0066] The baby navel patch provided herein has a sol layer primarily prepared from the aforementioned hot melt adhesive for baby navel patches. Due to the properties of the aforementioned hot melt adhesive for baby navel patches, the baby navel patch has good adhesion, is painless, and is easy to tear at temperatures between 35 and 40°C, and also exhibits excellent anti-inflammatory and anti-allergic effects.

[0067] The technical solution of the present application will be further described below with reference to embodiments.

[0068] Note: The specifications, models and manufacturers of the raw materials used in the following examples / comparative examples are as follows:

[0069] Examples 1 to 3

[0070] A method for preparing hot melt adhesive for baby umbilical cord stickers, the raw materials of the hot melt adhesive comprising:

[0071] The preparation method comprises:

[0072] 1) adding mineral oil, 40% of the total weight of tackifying resin, and antioxidant into a reactor, and controlling the temperature to be 140-145° C. to melt the tackifying resin;

[0073] 2) After the tackifying resin in step 1) is completely melted, the thermoplastic copolymer is added, and the stirring speed is controlled at 15 to 20 r / min and the pressure is controlled at -0.8 to 1 MPa to perform vacuuming for 80 to 100 minutes until the thermoplastic copolymer is completely melted;

[0074] 3) Add the remaining tackifying resin, control the temperature to 140-145°C, the speed to 60-80 r / min, and the pressure to -1.0-0.9 MPa for 30-40 minutes;

[0075] 4) After the tackifying resin in step 3 is completely melted, cellulose and an anti-inflammatory substance are added, and the stirring speed is controlled to be 15 to 20 r / min and the pressure is controlled to be -0.8 to 1 MPa, and air is pumped for 20 to 30 minutes until the cellulose and the anti-inflammatory substance are evenly dispersed, and then naturally cooled to room temperature to obtain a baby navel hot melt adhesive.

[0076] Example 4

[0077] This embodiment is the same as Example 2 except that "C5 petroleum resin" is replaced by "rosin resin".

[0078] Through later application tests, it was found that the tackifying resin in this embodiment uses rosin resin. Since rosin resin has a certain irritation to the skin, after the navel patch was made with the hot melt adhesive of this embodiment, it was applied to the skin of the palm of an adult for a test. After 24 hours of application, a certain redness would appear on the skin surface. However, the navel patch made with the hot melt adhesive of Example 2 of this application did not produce the above phenomenon in the test.

[0079] Example 5

[0080] This embodiment is the same as Example 2 except that the "zirconium phosphate silver-loaded inorganic antibacterial powder" is replaced by "inorganic silver ions".

[0081] Comparative Examples 1 to 6

[0082] A method for preparing hot melt adhesive for baby umbilical cord stickers, the raw materials of the hot melt adhesive comprising:

[0083] The preparation method is the same as that in Example 2.

[0084] Test Example 1

[0085] In order to demonstrate that the hot melt adhesive for the baby navel patch of the present application has good application viscosity and appropriate peeling force at 35-40° C., the hot melt adhesives of the baby navel patches prepared in Examples 1-5 and Comparative Examples 1-6 were subjected to an application test.

[0086] The specific detection methods are as follows:

[0087] The samples prepared in Examples 1 to 5 and Comparative Examples 1 to 6 were distributed to laboratory personnel for patch effect testing. The patched areas were inflamed areas, and the results of each experiment were counted after 24 hours of patching.

[0088] The specific test results are as follows:

[0089] The above test results show that the hot melt adhesives prepared in Examples 1 to 4 exhibit excellent application viscosity and appropriate peel strength at 35-40°C. Further preparation of these adhesives into baby navel patches achieves the technical benefits of good application, painless tearing, and ease of removal. However, Example 4 contains a relatively high amount of rosin, which may pose a greater risk of allergies.

[0090] The zirconium phosphate-loaded silver inorganic antibacterial powders in Examples 1-4 exhibited superior temperature resistance and stability compared to the product prepared using inorganic silver ions in Example 5. Furthermore, the zirconium phosphate-loaded silver inorganic antibacterial powders exhibited the characteristic of not affecting product performance during high-temperature preparation. While the hot-melt adhesive adhesive adhesive and peel strength of the baby navel patch prepared in Example 5 exhibited moderate application viscosity and peel strength, the anti-inflammatory effect of the inorganic silver after high-temperature processing did not meet the desired level.

[0091] In comparative examples 1 to 6, in which the mass ratio of the thermoplastic copolymer, the tackifying resin, and the cellulose is not within the range of 10-20:20-30:20-50, the application viscosity and peeling force at 35-40° C. are not ideal, as shown below:

[0092] In comparative example 1, the mass ratio of thermoplastic copolymer, tackifying resin and cellulose is 5:20:20. Due to the low content of thermoplastic copolymer in the ratio, the product obtained by applying it to the navel patch is harder and has poor adhesion, but the peel strength is too high, which will cause greater pain.

[0093] In comparative example 2, the mass ratio of the thermoplastic copolymer, the tackifying resin and the cellulose is 25:30:50. Due to the high content of the thermoplastic copolymer in the ratio, the product obtained by applying it to the navel patch has insufficient viscosity, poor adhesion and is easy to fall off.

[0094] In comparative example 3, the mass ratio of thermoplastic copolymer, tackifying resin and cellulose is 10:15:20. Due to the low content of tackifying resin in the ratio, the product obtained by applying it to the navel patch has insufficient viscosity, poor adhesion and is easy to fall off.

[0095] In comparative example 4, the mass ratio of thermoplastic copolymer, tackifying resin and cellulose is 20:35:50. Since the content of tackifying resin in the ratio is relatively high, the product prepared by applying it to the navel patch has good application viscosity, but strong peeling force and strong pain.

[0096] In comparative example 5, the mass ratio of thermoplastic copolymer, thickening resin and cellulose is 10:20:15. Due to the low content of cellulose in the ratio, the product obtained by applying it to the navel patch has good initial viscosity but poor later, strong peeling force and poor sweat resistance.

[0097] In comparative example 6, the mass ratio of thermoplastic copolymer, tackifying resin and cellulose is 20:30:55. Due to the high content of cellulose in the ratio, the product obtained by applying it to the navel patch has slightly weaker application viscosity, weaker peeling force and is drier.

[0098] It can be seen from the above experiments that only when the mass ratio of "thermoplastic copolymer, tackifying resin and cellulose" in this application is 10-20:20-30:20-50, the baby navel hot melt adhesive prepared therefrom has good application viscosity and appropriate peeling force at 35-40°C, and the implementation method outside the above mass ratio range cannot achieve the corresponding technical effect.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application. Industrial Applicability

[0100] The hot melt adhesive for baby navel patches provided in this application is mainly prepared from thermoplastic copolymers, mineral oil, tackifying resins, cellulose, anti-inflammatory substances and antioxidants, wherein the mass ratio of the thermoplastic copolymer, tackifying resin and cellulose is 10-20:20-30:20-50. The hot melt adhesive obtained by configuring the mass ratio of the above-mentioned thermoplastic copolymer, tackifying resin and cellulose has good application viscosity and appropriate peeling force under the conditions of 35-40°C. Using it as a hot melt adhesive for baby navel patches can achieve the technical effects of good application, painless and easy tearing. At the same time, the hot melt adhesive of this application also contains anti-inflammatory substances, and the raw materials used are non-allergic and irritating. Therefore, the hot melt adhesive for baby navel patches in this application also has good anti-inflammatory and anti-allergic effects. Therefore, the hot melt adhesive and the baby navel patch with the hot melt adhesive have good commercial application prospects.

Claims

1. A hot melt adhesive for baby navel stickers, characterized in that: The hot melt adhesive is mainly prepared from thermoplastic copolymer, mineral oil, tackifying resin, cellulose, anti-inflammatory substance and antioxidant, wherein: The mass ratio of the thermoplastic copolymer, the tackifying resin and the cellulose is 10-20:20-30:20-50.

2. The hot melt adhesive for baby navel patch according to claim 1, characterized in that: The thermoplastic copolymer is at least one of styrene-isoprene block copolymer, styrene-butadiene block copolymer, hydrogenated styrene-isoprene block copolymer and hydrogenated styrene-butadiene block copolymer.

3. The hot melt adhesive for baby navel patch according to claim 1 or 2, characterized in that: The thermoplastic copolymer is obtained by compounding a styrene-isoprene block copolymer and a hydrogenated styrene-butadiene block copolymer, and the weight ratio of the styrene-isoprene block copolymer to the hydrogenated styrene-butadiene block copolymer is 10-15:

5.

4. The hot melt adhesive for baby navel patch according to any one of claims 1 to 3, characterized in that: The tackifying resin is at least one of rosin resin, hydrogenated rosin resin, C5 petroleum resin, C9 petroleum resin, and C5 / C9 copolymer resin, preferably C5 or C9 petroleum resin.

5. The hot melt adhesive for baby navel patch according to any one of claims 1 to 4, characterized in that: The cellulose is at least one of methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose.

6. The hot melt adhesive for baby navel patch according to any one of claims 1 to 5, characterized in that: The anti-inflammatory substance is an ion bactericide; The ion bactericide includes silver ion bactericide, copper ion bactericide and zinc ion bactericide.

7. The hot melt adhesive for baby navel patch according to claim 6, characterized in that: The ion bactericide is zirconium phosphate-loaded silver inorganic antibacterial powder.

8. The hot melt adhesive for baby navel patch according to any one of claims 1 to 7, characterized in that: The mineral oil is naphthenic oil or white mineral oil; The antioxidant is a hindered phenol antioxidant, and the hindered phenol antioxidant is one or both of BASF antioxidant RGanox B225 and 2,6-di-tert-butyl-4-methylphenol.

9. The hot melt adhesive for baby navel patch according to any one of claims 1 to 8, characterized in that: Calculated by mass, the hot melt adhesive includes: 10-20 parts of thermoplastic copolymer, 5-10 parts of mineral oil, 20-30 parts of tackifying resin, 20-50 parts of cellulose, 1-10 parts of anti-inflammatory substance, and 0.1-0.5 parts of antioxidant.

10. A method for preparing hot melt adhesive for baby navel stickers according to any one of claims 1 to 9, characterized in that: The preparation method comprises: (A) heating and melting a portion of the tackifying resin, mineral oil, and an antioxidant to mix uniformly to obtain an intermediate A; (B) adding a thermoplastic copolymer to the intermediate A and heating and stirring until melted, then adding the remaining tackifying resin and heating and stirring until melted, and then adding cellulose and an anti-inflammatory substance and heating and stirring until melted, to obtain an intermediate B; (C) cooling the intermediate B to obtain a hot melt adhesive for baby navel patch; The heating and melting temperature in step (A) is 140-145°C; In the step (B), the heating and stirring are performed until the melting temperature is 140-145°C.

11. The method for preparing hot melt adhesive for baby navel stickers according to claim 10, characterized in that: The tackifying resin in step (A) is 40% of the total mass of the tackifying resin; The tackifying resin added in step (B) is 60% of the total mass of the tackifying resin; The step (B) is prepared under negative pressure pumping conditions.

12. A baby navel patch, characterized in that: The baby umbilical patch comprises a backing layer and a sol layer; The sol layer is mainly made of the hot melt adhesive for baby navel stickers according to any one of claims 1 to 9. Prepared.