Patch adhesive and preparation method thereof

Abstract

The invention relates to the field of nail polish glue, in particular to patch glue and a preparation method thereof. The patch adhesive provided by the invention is a non-sticky patch adhesive for LED curing, and is prepared by the following steps: pre-polymerizing saturated bio-based polyester polyol with the molecular weight of 2000-4000 and isocyanate, carrying out chain extension by using bio-based micromolecular alcohol, finally carrying out end capping by using a functional acrylate monomer, and adding a photoinitiator and a bio-based monomer. The patch adhesive can effectively improve the surface drying performance of nail tips and nails, is small in heat release and free of pain during application, meets the special requirements of the manicure market, and meets the environmental protection standard at the same time.

Description

Technical Field

[0001] The invention relates to the field of nail polish glue, in particular to a patch glue and a preparation method thereof. Background Art

[0002] Patches are a type of nail polish that is applied to fingernails or toenails, cured after exposure to light, and pasted on the surface of the nail plate to protect and decorate the nail plate. Currently available patch glue has poor surface drying performance, and the surface is prone to oil floating after being irradiated with a nail lamp. In addition, the existing patch glue releases a lot of heat during light curing, and most users will at least feel slight pain, and those who are sensitive to pain may even feel a burning sensation. In addition, the raw materials used in existing patch glues are all petroleum-based, which is not environmentally friendly and is increasingly difficult to meet the country's increasingly increasing carbon emission requirements.

[0003] Therefore, environmentally friendly patch adhesives with good surface drying performance and low heat release have potential market prospects. Currently, this aspect is still blank in the market. In order to fill the market gap, it is urgent to develop a patch adhesive that can meet the relevant performance requirements. Summary of the invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide a patch adhesive and a preparation method thereof. The environmentally friendly patch adhesive provided by the present invention has good surface drying performance and low heat release.

[0005] The present invention provides a patch adhesive, comprising:

[0006] Photoinitiator: 0.5~2 parts;

[0007] Bio-based monomer: 8-20 parts; the bio-based monomer is selected from at least one of IBOA or IBOMA;

[0008] Patch adhesive material;

[0009] The patch adhesive material is prepared from the following components in parts by mass:

[0010] Saturated bio-based polyester polyol: 50-70 parts; the saturated bio-based polyester polyol is obtained by reacting a bio-based alcohol monomer, a bio-based dibasic acid substance and an esterification catalyst; the bio-based alcohol monomer is at least one of bio-based 1,4-butanediol, bio-based 1,2-propylene glycol or bio-based 1,3-propylene glycol; the bio-based dibasic acid substance is at least one of bio-based azelaic acid, bio-based sebacic acid, bio-based succinic acid or bio-based 2,5-furandicarboxylic acid;

[0011] Isocyanate: 10-20 parts;

[0012] Catalyst: 0.1~1 part;

[0013] Inhibitor: 0.1~1 part;

[0014] Antioxidant: 0.1~0.5 parts;

[0015] Bio-based small molecule diols: 5-10 parts;

[0016] Functional acrylate monomer: 4~12 parts.

[0017] In the preparation components of the patch adhesive material of the present invention, the saturated bio-based polyester polyol is obtained by reacting a bio-based alcohol monomer, a bio-based dibasic acid substance and an esterification catalyst. Specifically, the saturated bio-based polyester polyol is obtained by reacting 30 to 45 parts by mass of a bio-based alcohol monomer, 55 to 70 parts by mass of a bio-based dibasic acid substance and 0.1 to 0.5 parts by mass of an esterification catalyst. Preferably, the saturated bio-based polyester polyol is obtained by reacting 35 to 42 parts by mass of a bio-based alcohol monomer, 58 to 65 parts by mass of a bio-based dibasic acid substance and 0.2 to 0.4 parts by mass of an esterification catalyst. Among them, the bio-based alcohol monomer is at least one of bio-based 1,4-butanediol, bio-based 1,2-propylene glycol or bio-based 1,3-propylene glycol; the bio-based dibasic acid substance is selected from at least one of bio-based azelaic acid, bio-based sebacic acid, bio-based succinic acid or bio-based 2,5-furandicarboxylic acid; the esterification catalyst is selected from at least one of tetrabutyl titanate and isopropyl titanate.

[0018] The molecular weight of the saturated bio-based polyester polyol of the present invention is 2000-4000. The present invention uses the saturated bio-based polyester polyol with a molecular weight of 2000-4000 as the starting material, and after prepolymerization with isocyanate, chain extension with bio-based small molecule alcohol and end-capping with functional acrylate monomer to obtain the patch adhesive material, it is combined with a specific bio-based monomer to obtain an environmentally friendly patch adhesive with good surface drying performance and low heat release.

[0019] Preferably, the patch adhesive of the present invention comprises:

[0020] Photoinitiator: 0.8~1.2 parts;

[0021] Bio-based monomer: 9-14 parts; the bio-based monomer is the same as above and will not be described in detail;

[0022] and patch adhesive materials;

[0023] The patch adhesive material is prepared from the following components in parts by mass:

[0024] Saturated bio-based polyester polyol: 50-55 parts; the saturated bio-based polyester polyol is the same as above and will not be described in detail;

[0025] Isocyanate: 18-20 parts;

[0026] Catalyst: 0.3~0.5 parts;

[0027] Inhibitor: 0.4~0.5 parts;

[0028] Antioxidant: 0.2~0.4 parts;

[0029] Bio-based small molecule diol: 5-7 parts;

[0030] Functional acrylate monomer: 5~10 parts.

[0031] Among the components of the patch adhesive of the present invention, the photoinitiator is selected from at least one of TPO, TMO or TPO-L; among the preparation components of the patch adhesive material, the isocyanate is selected from at least one of IPDI, TMDI, hydrogenated MDI or XDI; the catalyst is selected from MC 710; the inhibitor is selected from at least one of p-hydroxyanisole, 2,6-di-tert-butyl-p-cresol (BHT), and tert-butylhydroquinone (TBHQ); the antioxidant is selected from at least one of antioxidant 1706, antioxidant 1010, and antioxidant 168; the bio-based small molecule diol is selected from at least one of bio-based 1,4-butanediol, bio-based 1,2-propylene glycol or bio-based 1,3-propylene glycol; the functional acrylate monomer is selected from at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate, hydroxyethyl methacrylate or hydroxypropyl methacrylate.

[0032] In some embodiments of the present invention, the patch adhesive comprises: a photoinitiator, a bio-based monomer and a patch adhesive material; wherein the bio-based monomer is IBOA; the patch adhesive material is prepared from saturated bio-based polyester polyol, TMDI, a catalyst, an inhibitor, an antioxidant, bio-based 1,2-propylene glycol and 4-hydroxybutyl acrylate; the saturated bio-based polyester polyol is obtained by reacting bio-based 1,4-butanediol, bio-based azelaic acid and tetrabutyl titanate; the photoinitiator, catalyst, inhibitor and antioxidant are the same as those described above and will not be repeated;

[0033] Alternatively, the bio-based monomer is IBOA; the patch adhesive material is prepared from saturated bio-based polyester polyol, IPDI, catalyst, inhibitor, antioxidant, bio-based 1,4-butanediol and 4-hydroxybutyl acrylate; the saturated bio-based polyester polyol is obtained by reacting bio-based 1,2-propylene glycol, bio-based sebacic acid and tetrabutyl titanate; the photoinitiator, catalyst, inhibitor and antioxidant are the same as above and will not be repeated;

[0034] Alternatively, the bio-based monomer is IBOMA; the patch adhesive material is prepared from saturated bio-based polyester polyol, XDI, catalyst, inhibitor, antioxidant, bio-based 1,3-propylene glycol and 2-hydroxybutyl acrylate; the saturated bio-based polyester polyol is obtained by reacting bio-based 1,4-butanediol, bio-based sebacic acid and tetrabutyl titanate; the photoinitiator, catalyst, inhibitor and antioxidant are the same as above and will not be repeated.

[0035] The present invention also provides a method for preparing the patch adhesive described in any of the above technical solutions, comprising the following steps:

[0036] The photoinitiator, the bio-based monomer and the patch adhesive material are mixed to obtain the patch adhesive. The photoinitiator, the bio-based monomer and the patch adhesive material of the present invention are the same as those described above and will not be described in detail.

[0037] The present invention also provides another method for preparing the patch adhesive described in any of the above technical solutions, comprising the following steps:

[0038] a) reacting a bio-based alcohol monomer, a bio-based dibasic acid substance and an esterification catalyst to obtain a saturated bio-based polyester polyol;

[0039] b) subjecting the catalyst, polymerization inhibitor, antioxidant, isocyanate and the saturated bio-based polyester polyol obtained in step a) to a prepolymerization reaction, then subjecting the material obtained by the prepolymerization reaction to a chain extension reaction with a bio-based small molecule diol, and then subjecting the material obtained by the chain extension reaction to a capping reaction with a functional acrylate monomer;

[0040] c) mixing the photoinitiator, the bio-based monomer and the material obtained in step b) to obtain the patch adhesive.

[0041] The bio-based alcohol monomer, bio-based dibasic acid substance and esterification catalyst in step a) of the present invention, the saturated bio-based polyester polyol obtained in step a), the catalyst, inhibitor, antioxidant, isocyanate, bio-based small molecule diol and functional acrylate monomer in step b), and the photoinitiator and bio-based monomer in step c) are the same as those described above and will not be described in detail.

[0042] The present invention first synthesizes saturated bio-based polyester polyols by a high-temperature melting method, that is, reacting bio-based alcohol monomers, bio-based dibasic acids and esterification catalysts to obtain saturated bio-based polyester polyols. Specifically, under a protective gas atmosphere, bio-based alcohol monomers, bio-based dibasic acids and esterification catalysts are reacted to obtain saturated bio-based polyester polyols. The temperature of the reaction of the present invention is 180°C to 230°C; the reaction time is based on the acid value of the product of the reaction, and the reaction ends when the acid value is less than 1 mgKOH / g, and the reaction time is generally 10 h to 12 h. During the reaction of the present invention, when the acid value of the product of the reaction is less than 5 mgKOH / g, water in the reaction product is removed by vacuuming. The protective gas of the present invention is selected from one or more of nitrogen, helium, neon or argon.

[0043] After obtaining the saturated bio-based polyester polyol, the catalyst, the polymerization inhibitor, the antioxidant, the isocyanate and the obtained saturated bio-based polyester polyol are subjected to a prepolymerization reaction. The temperature of the prepolymerization reaction of the present invention is 40°C to 50°C; the time of the prepolymerization reaction is calculated in terms of NCO%, and the prepolymerization reaction is stopped when the NCO% is close to the theoretical value. The time of the prepolymerization reaction is generally 2 h to 6 h.

[0044] After the prepolymerization reaction, the material obtained by the prepolymerization reaction and the bio-based small molecule diol are subjected to a chain extension reaction. The temperature of the chain extension reaction of the present invention is 65° C. to 75° C., and the time of the chain extension reaction is 1.5 h to 2.5 h.

[0045] After the chain extension reaction, the present invention performs an end-capping reaction on the material obtained by the chain extension reaction and the functional acrylate monomer. Specifically, the functional acrylate monomer is added to the material obtained by the chain extension reaction for 1.5 h to 2.5 h to perform an end-capping reaction. The temperature of the end-capping reaction of the present invention is 70° C. to 90° C.; the time of the end-capping reaction of the present invention is based on the NCO% of the product of the end-capping reaction. When the NCO% of the product of the end-capping reaction is less than 0.05%, the end-capping reaction is terminated, and the time of the end-capping reaction is generally 3 h to 5 h.

[0046] After the end-capping reaction, the photoinitiator, the bio-based monomer and the material obtained in step b) are mixed to obtain the patch adhesive. In certain embodiments of the present invention, the mixing is performed at a temperature of 65°C to 75°C.

[0047] The present invention first uses specific bio-based alcohol monomers and bio-based dibasic acids to prepare saturated bio-based polyester polyols. The raw materials used for polyols in the current patch adhesive in the field are all petroleum-based, which is not environmentally friendly. The bio-based materials used in the present invention are a renewable resource and also meet the national carbon emission requirements, and have potential market prospects. Then the obtained saturated bio-based polyester polyol is reacted with isocyanate, and then a bio-based small molecule diol is used as a chain extender for chain extension, and finally a functional acrylate monomer is used for end-capping, so as to obtain a resin with a bio-based main chain; this resin is then added with an appropriate amount of photoinitiator and bio-based monomers to obtain a bio-based patch adhesive.

[0048] The present invention also provides an application of the patch adhesive obtained by any of the above technical solutions, including:

[0049] The adhesive patch is placed on the nail plate, and the adhesive patch is illuminated;

[0050] The light energy required for the patch glue to cure on the nail piece is 35 W / cm 2 ~40 W / cm 2 .

[0051] The present invention provides a patch adhesive and a preparation method thereof. The patch adhesive provided by the present invention is a LED-cured non-stick patch adhesive, which is prepolymerized with a saturated bio-based polyester polyol having a molecular weight of 2000 to 4000 and an isocyanate, chain extended with a bio-based small molecule alcohol, and finally end-capped with a functional acrylate monomer, and a photoinitiator and a bio-based monomer are added to obtain the patch adhesive. The patch adhesive of the present invention can effectively improve the surface drying performance of nail plates and nails, has low heat release, and is painless when applied, meeting the special needs of the nail art market while meeting environmental protection standards. DETAILED DESCRIPTION

[0052] The present invention discloses a patch adhesive and a method for preparing the same. Those skilled in the art can refer to the contents of this article and appropriately improve the process parameters to achieve the same. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are deemed to be included in the present invention. The methods and applications of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the methods and applications of this article without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

[0053] The present invention will be further described below in conjunction with embodiments:

[0054] Example 1

[0055] a) Preparation of bio-based polyester diol BE1 with a molecular weight of 2000:

[0056] At room temperature, 60 parts by mass of bio-based azelaic acid, 40 parts by mass of bio-based 1,4-butanediol and 0.2 parts by mass of catalyst tetrabutyl titanate were added to the reactor, high-purity nitrogen was introduced, the temperature was slowly raised to 220°C, the reaction was carried out for 10 hours, and then the water output and the acid value were recorded. When the acid value was less than 5 mgKOH / g, the remaining water was removed by vacuum until the acid value was less than 1 mgKOH / g. The reaction was completed to obtain a bio-based polyester diol BE1 with a molecular weight of 2000.

[0057] b) At room temperature, 55 parts by mass of bio-based polyester diol BE1, 20 parts by mass of isocyanate TMDI, 0.5 parts by mass of catalyst MC-710, 0.5 parts by mass of inhibitor p-hydroxyanisole and 0.3 parts by mass of antioxidant 1076 were added into a reactor and reacted at 45°C for 4 hours. When the NCO% was close to the theoretical value, an intermediate reactant was obtained and the next reaction was carried out.

[0058] c) Raise the temperature to 70°C, add 5 parts by weight of bio-based 1,2-propylene glycol, and keep the temperature at 70°C for 2 h.

[0059] d) Raise the temperature to 80°C, add 10 parts by weight of 4-hydroxybutyl acrylate dropwise, and add for 2 hours. Keep the temperature at 80°C for another 2 hours. The reaction is completed when the NCO% is less than 0.05%.

[0060] e) Cooling to 70° C., adding 1 part by weight of photoinitiator TPO-L and 9 parts by weight of bio-based monomer IBOA, and stirring well to obtain bio-based non-stick patch adhesive 1#.

[0061] Example 2

[0062] a) Preparation of bio-based polyester diol BE2 with a molecular weight of 3000:

[0063] At room temperature, 65 parts by mass of bio-based sebacic acid, 15 parts by mass of bio-based 1,2-propylene glycol, 20 parts by mass of bio-based 1,4-butanediol and 0.4 parts by mass of catalyst tetrabutyl titanate were added to the reactor, high-purity nitrogen was introduced, the temperature was slowly raised to 220°C, and the reaction was carried out for 12 hours. Then, the water output and the acid value were recorded. When the acid value was less than 5 mgKOH / g, the remaining water was removed by vacuum until the acid value was less than 1 mgKOH / g. The reaction was completed to obtain a bio-based polyester diol BE3 with a molecular weight of 2500.

[0064] b) At room temperature, 55 parts by mass of bio-based polyester diol BE3, 20 parts by mass of isocyanate IPDI, 0.3 parts by mass of catalyst MC-710, 0.4 parts by mass of inhibitor p-hydroxyanisole and 0.3 parts by mass of antioxidant 1076 were added into a reactor and reacted at 45°C for 4 hours. When the NCO% was close to the theoretical value, an intermediate reactant was obtained and the next reaction was carried out.

[0065] c) Raise the temperature to 70°C, add 5 parts by weight of bio-based 1,4-butanediol, and keep the temperature at 70°C for 2 h.

[0066] d) Raise the temperature to 80°C, add 5 parts by weight of 4-hydroxybutyl acrylate dropwise, and add for 2 hours. Keep the temperature at 80°C for another 2 hours. The reaction is completed when the NCO% is less than 0.05%.

[0067] e) Cooling to 70° C., adding 1 part by weight of photoinitiator TPO-L and 14 parts by weight of bio-based monomer IBOA, and stirring well to obtain bio-based non-stick patch adhesive 2#.

[0068] Example 3

[0069] a) Preparation of bio-based polyester diol BE3 with a molecular weight of 2500:

[0070] At room temperature, 58 parts by mass of bio-based sebacic acid, 42 parts by mass of bio-based 1,4-butanediol and 0.2 parts by mass of catalyst tetrabutyl titanate were added to the reactor, high-purity nitrogen was introduced, the temperature was slowly raised to 220°C, and the reaction was carried out for 10 hours. Then, the water output and the acid value were recorded. When the acid value was less than 5 mgKOH / g, the remaining water was removed by vacuum until the acid value was less than 1 mgKOH / g. The reaction was completed to obtain a bio-based polyester diol BE3 with a molecular weight of 2500.

[0071] b) At room temperature, 50 parts by mass of bio-based polyester diol BE3, 20 parts by mass of isocyanate XDI, 0.5 parts by mass of catalyst MC-710, 0.5 parts by mass of inhibitor p-hydroxyanisole and 0.3 parts by mass of antioxidant 1076 were added into a reactor and reacted at 45°C for 4 hours. When the NCO% was close to the theoretical value, an intermediate reactant was obtained and the next reaction was carried out.

[0072] c) Raise the temperature to 70°C, add 7 parts by weight of bio-based 1,3-propylene glycol, and keep the temperature at 70°C for 2 h.

[0073] d) Raise the temperature to 80°C, add 10 parts by weight of 2-hydroxybutyl acrylate dropwise, and add for 2 hours. Keep the temperature at 80°C for another 2 hours. The reaction is completed when the NCO% is less than 0.05%.

[0074] e) Cooling to 70° C., adding 1 part by weight of photoinitiator TPO-L and 12 parts by weight of bio-based monomer IBOMA, and stirring well to obtain bio-based non-stick patch adhesive 3#.

[0075] The bio-based non-stick patch adhesive 1#, bio-based non-stick patch adhesive 2# and bio-based non-stick patch adhesive 3# obtained in Examples 1 to 3 were cured, and their Shore hardness, surface dryness, heat release and adhesion were tested as follows:

[0076] (1) Curing energy: Commercially available general-purpose 36-inch nail lamp;

[0077] (2) Shore hardness: Tested with a Shore hardness tester, the larger the value, the higher the hardness;

[0078] (3) Surface drying: whether the surface is oily after being irradiated with a 36W nail lamp. It is expressed in 4 levels. The higher the level, the better the surface drying and the less oily it is. (General test method for nail polish)

[0079] (4) Heat release: divided into burning pain, pain, slight pain, and no pain according to the severity;

[0080] (5) Adhesion: The adhesion between the fingernail and the nail plate is divided into 4 levels from small to large, 1 means it is easily pulled apart, 2 means it can be pulled apart with a little force, 3 means it can be pulled apart with a lot of force, and 4 means it cannot be pulled apart and the nail plate breaks. (General test method for nail polish)

[0081] The results are shown in Table 1:

[0082] Table 1

[0083]

[0084] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A patch adhesive, characterized in that: include: Photoinitiator: 0.5~2 parts; Bio-based monomer: 8-20 parts; the bio-based monomer is selected from at least one of IBOA or IBOMA; and patch adhesive materials; The patch adhesive material is prepared from the following components in parts by mass: Saturated bio-based polyester polyol: 50-70 parts; the saturated bio-based polyester polyol is obtained by reacting a bio-based alcohol monomer, a bio-based dibasic acid substance and an esterification catalyst; the bio-based alcohol monomer is at least one of bio-based 1,4-butanediol, bio-based 1,2-propylene glycol or bio-based 1,3-propylene glycol; the bio-based dibasic acid substance is at least one of bio-based azelaic acid, bio-based sebacic acid, bio-based succinic acid or bio-based 2,5-furandicarboxylic acid; Isocyanate: 10-20 parts; Catalyst: 0.1~1 part; Inhibitor: 0.1~1 part; Antioxidant: 0.1~0.5 parts; Bio-based small molecule diols: 5-10 parts; Functional acrylate monomer: 4~12 parts.

2. The patch adhesive according to claim 1, characterized in that: The saturated bio-based polyester polyol is obtained by reacting 30 to 45 parts by mass of a bio-based alcohol monomer, 55 to 70 parts by mass of a bio-based dibasic acid substance and 0.1 to 0.5 parts by mass of an esterification catalyst.

3. The patch adhesive according to claim 1, characterized in that: The molecular weight of the saturated bio-based polyester polyol is 2000-4000.

4. The patch adhesive according to claim 1, characterized in that: include: Photoinitiator: 0.8~1.2 parts; Bio-based monomers: 9-14 parts; and patch adhesive materials; The patch adhesive material is prepared from the following components in parts by mass: Saturated bio-based polyester polyol: 50-55 parts; Isocyanate: 18-20 parts; Catalyst: 0.3~0.5 parts; Inhibitor: 0.4~0.5 parts; Antioxidant: 0.2~0.4 parts; Bio-based small molecule diol: 5-7 parts; Functional acrylate monomer: 5~10 parts.

5. The patch adhesive according to any one of claims 1 to 4, characterized in that: The photoinitiator is selected from at least one of TPO, TMO or TPO-L; The esterification catalyst is selected from at least one of tetrabutyl titanate and isopropyl titanate; The isocyanate is selected from at least one of IPDI, TMDI, hydrogenated MDI or XDI; The catalyst is selected from MC 710; The polymerization inhibitor is selected from at least one of p-hydroxyanisole, 2,6-di-tert-butyl-p-cresol, and tert-butylhydroquinone; The antioxidant is selected from at least one of antioxidant 1076, antioxidant 1010, and antioxidant 168; The bio-based small molecule diol is selected from at least one of bio-based 1,4-butanediol, bio-based 1,2-propylene glycol or bio-based 1,3-propylene glycol; The functional acrylic acid ester monomer is selected from at least one of hydroxyethyl acrylate, hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate, hydroxyethyl methacrylate or hydroxypropyl methacrylate.

6. The patch adhesive according to claim 5, characterized in that: include: Photoinitiators, bio-based monomers, and patch adhesive materials; The bio-based monomer is IBOA; The patch adhesive material is prepared from saturated bio-based polyester polyol, TMDI, a catalyst, an inhibitor, an antioxidant, bio-based 1,2-propylene glycol and 4-hydroxybutyl acrylate; the saturated bio-based polyester polyol is obtained by reacting bio-based 1,4-butanediol, bio-based azelaic acid and tetrabutyl titanate; or, The bio-based monomer is IBOA; The patch adhesive material is prepared from saturated bio-based polyester polyol, IPDI, a catalyst, an inhibitor, an antioxidant, bio-based 1,4-butanediol and 4-hydroxybutyl acrylate; the saturated bio-based polyester polyol is obtained by reacting bio-based 1,2-propylene glycol, bio-based sebacic acid and tetrabutyl titanate; or, The bio-based monomer is IBOMA; The patch adhesive material is prepared from saturated bio-based polyester polyol, XDI, a catalyst, an inhibitor, an antioxidant, bio-based 1,3-propylene glycol and 2-hydroxybutyl acrylate; the saturated bio-based polyester polyol is obtained by reacting bio-based 1,4-butanediol, bio-based sebacic acid and tetrabutyl titanate.

7. The method for preparing the patch adhesive according to any one of claims 1 to 6, characterized in that: The following steps are involved: The photoinitiator, the bio-based monomer and the patch adhesive material are mixed to obtain the patch adhesive.

8. The method for preparing the patch adhesive according to any one of claims 1 to 6, characterized in that: The following steps are involved: a) reacting a bio-based alcohol monomer, a bio-based dibasic acid substance and an esterification catalyst to obtain a saturated bio-based polyester polyol; b) subjecting the catalyst, polymerization inhibitor, antioxidant, isocyanate and the saturated bio-based polyester polyol obtained in step a) to a prepolymerization reaction, then subjecting the material obtained by the prepolymerization reaction to a chain extension reaction with a bio-based small molecule diol, and then subjecting the material obtained by the chain extension reaction to a capping reaction with a functional acrylate monomer; c) mixing the photoinitiator, the bio-based monomer and the material obtained in step b) to obtain the patch adhesive.

9. The preparation method according to claim 8, characterized in that: In step a), the reaction temperature is 180°C to 230°C; The reaction time is calculated based on the acid value of the product of the reaction. The reaction is stopped when the acid value is less than 1 mgKOH / g.

10. The preparation method according to claim 8, characterized in that: In step b), the temperature of the end-capping reaction is 70°C to 90°C; The end-capping reaction time is calculated based on the NCO% of the product of the end-capping reaction. When the NCO% is less than 0.05%, the end-capping reaction is completed.

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