Method for preparing plaster from hot-melt pressure-sensitive adhesive

Abstract

The invention relates to the technical field of hot-melt pressure-sensitive adhesives, and discloses a method for preparing a plaster from a hot-melt pressure-sensitive adhesive, which comprises the following steps: respectively preparing a first mixture, a second mixture and a third mixture; respectively heating and stirring the first mixture and the second mixture; performing vacuum treatment on the third mixture; mixing the first mixture, the second mixture and the third mixture to prepare a hot-melt pressure-sensitive adhesive mixture; the hot-melt pressure-sensitive adhesive mixture and the corresponding plaster composition are subjected to coating treatment, and a finished product is prepared; according to the preparation method of the plaster prepared from the hot-melt pressure-sensitive adhesive, the olefin copolymer containing alpha-olefin and the hydrogenated synthetic rubber are added, so that the product has good ductility, and the situation that the applied plaster cannot be effectively attached to the application position when a patient does large-amplitude movement is avoided, so that the plaster can be firmly attached, and the pain of the patient is relieved. Therefore, the treatment effect of the plaster is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt pressure sensitive adhesives, in particular to a method for preparing a plaster using hot melt pressure sensitive adhesives. Background Art

[0002] Thermoplastic elastomer (TPE) pressure-sensitive adhesive is made of raw materials such as thermoplastic elastomer rubber, tackifying resin and anti-aging additives. Among them, thermoplastic elastomer rubber is a material that has the characteristics of both rubber and thermoplastic plastics, and has the toughness and elasticity of rubber at room temperature; currently, thermoplastic elastomers are mainly styrene-butadiene-styrene (SBS) block copolymers and styrene-isoprene-styrene (SIS) block copolymers. Compared with SBS block copolymers, SIS block copolymers have smaller modulus and melt viscosity, have good processing properties, and can provide good wettability and adhesion for hot melt pressure-sensitive adhesives. Therefore, SIS block copolymers have become commonly used thermoplastic elastomers for hot melt pressure-sensitive adhesives.

[0003] In the prior art, the plaster has poor elasticity when it is actually applied. When the patient makes large-scale movements, the applied plaster cannot effectively adhere to the applied area, thereby greatly affecting the therapeutic effect of the plaster. In view of this, we propose a preparation method for a plaster using a hot-melt pressure-sensitive adhesive. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing a hot-melt pressure-sensitive adhesive plaster to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing a plaster using a hot melt pressure-sensitive adhesive, the preparation method comprising the following steps:

[0006] S1, first mixing an olefin copolymer containing α-olefin and a hydrogenated synthetic rubber to obtain a first mixture;

[0007] S2, mixing the composite antioxidant, the composite light stabilizer, and the plasticizer for a second time to obtain a second mixture;

[0008] S3, mixing the ultraviolet light absorber and the styrene-butadiene-styrene block copolymer for a third time to obtain a third mixture;

[0009] S4, heating and stirring the first mixture and the second mixture respectively;

[0010] S5, vacuum-treating the third mixture;

[0011] S6, mixing the first mixture in S4, the second mixture and the third mixture in S5 to obtain a hot melt pressure-sensitive adhesive mixture;

[0012] S7, coating the hot melt pressure-sensitive adhesive mixture with the corresponding plaster composition to obtain a finished product.

[0013] Optionally, the mass ratio of the olefin copolymer containing α-olefin to the hydrogenated synthetic rubber in the first mixture is 1:2.5.

[0014] Optionally, the mass ratio of the composite antioxidant, the composite light stabilizer and the plasticizer in the second mixture is 1:2:1.

[0015] Optionally, the mass ratio of the ultraviolet light absorber to the styrene-butadiene-styrene block copolymer in the third mixture is 1:110.

[0016] Optionally, the mass ratio of the first mixture, the second mixture and the third mixture is 80:1:120.

[0017] Optionally, the olefin copolymer containing α-olefin is selected from at least one of amorphous α-olefin copolymer and polyolefin elastomer POE; and the 25° C. toluene solution viscosity of the styrene-butadiene-styrene block copolymer is 1000-1500 CPS.

[0018] Optionally, the plasticizer is cycloalkane oil prepared by a three-stage high-pressure hydrogenation process, and the ultraviolet light absorber is at least one of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate.

[0019] Optionally, the composite antioxidant is at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris[2,4-di-tert-butylphenyl]phosphite; the composite light stabilizer is a hindered phenol antioxidant; the plasticizer is at least one of cycloalkyl rubber softening oil and liquid polyisobutylene rubber, and the viscosity of the plasticizer at 40°C is 50 to 150 CPS.

[0020] Compared with the prior art, the present invention provides a method for preparing a hot-melt pressure-sensitive adhesive plaster, which has the following beneficial effects:

[0021] 1. The preparation method of the hot-melt pressure-sensitive adhesive plaster, by adding olefin copolymers containing α-olefins and hydrogenated synthetic rubber, makes the product have good ductility, and avoids the problem that the plaster cannot be effectively adhered to the application site when the patient makes large-scale movements, so that the plaster can be firmly adhered, thereby effectively improving the therapeutic effect of the plaster.

[0022] 2. The preparation method of the hot-melt pressure-sensitive adhesive plaster comprises the mixed use of an olefin copolymer of α-olefin and a hydrogenated synthetic rubber, which effectively improves the waterproof ability of the plaster, thereby avoiding wound inflammation caused by water contact at the application site of the plaster, and further ensuring the therapeutic effect of the plaster. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the process structure of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1 As shown, the present invention provides a technical solution: a method for preparing a plaster using a hot melt pressure-sensitive adhesive, the preparation method comprising the following steps:

[0027] S1. performing a first mixing of an olefin copolymer containing α-olefin and a hydrogenated synthetic rubber to obtain a first mixture, wherein the mass ratio of the olefin copolymer containing α-olefin to the hydrogenated synthetic rubber in the first mixture is 1:2.5;

[0028] S2, mixing the composite antioxidant, the composite light stabilizer and the plasticizer for a second time to obtain a second mixture, wherein the mass ratio of the composite antioxidant, the composite light stabilizer and the plasticizer in the second mixture is 1:2:1;

[0029] S3, performing a third mixing of the ultraviolet light absorber and the styrene-butadiene-styrene block copolymer to obtain a third mixture, wherein the mass ratio of the ultraviolet light absorber to the styrene-butadiene-styrene block copolymer in the third mixture is 1:110;

[0030] S4, heating and stirring the first mixture and the second mixture respectively;

[0031] S5, vacuum-treating the third mixture;

[0032] S6, mixing the first mixture in S4, the second mixture and the third mixture in S5 to obtain a hot melt pressure-sensitive adhesive mixture;

[0033] S7, coating the hot melt pressure-sensitive adhesive mixture with the corresponding plaster composition to obtain a finished product.

[0034] Among them, the mass ratio of the first mixture, the second mixture and the third mixture is 80:1:120.

[0035] The olefin copolymer containing α-olefin is selected from at least one of an amorphous α-olefin copolymer and a polyolefin elastomer (POE); and the 25° C. toluene solution viscosity of the styrene-butadiene-styrene block copolymer is 1000 CPS.

[0036] The plasticizer is cyclohexane oil prepared by a three-stage high-pressure hydrogenation process, and the ultraviolet light absorber is at least one of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate.

[0037] The composite antioxidant is at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris[2,4-di-tert-butylphenyl]phosphite; the composite light stabilizer is a hindered phenol antioxidant; the plasticizer is at least one of cycloalkyl rubber softening oil and liquid polyisobutylene rubber, and the viscosity of the plasticizer at 40° C. is 50 CPS.

[0038] Example 2

[0039] like Figure 1 As shown, the present invention provides a technical solution: a method for preparing a plaster using a hot melt pressure-sensitive adhesive, the preparation method comprising the following steps:

[0040] S1. performing a first mixing of an olefin copolymer containing α-olefin and a hydrogenated synthetic rubber to obtain a first mixture, wherein the mass ratio of the olefin copolymer containing α-olefin to the hydrogenated synthetic rubber in the first mixture is 1:2.5;

[0041] S2, mixing the composite antioxidant, the composite light stabilizer and the plasticizer for a second time to obtain a second mixture, wherein the mass ratio of the composite antioxidant, the composite light stabilizer and the plasticizer in the second mixture is 1:2:1;

[0042] S3, performing a third mixing of the ultraviolet light absorber and the styrene-butadiene-styrene block copolymer to obtain a third mixture, wherein the mass ratio of the ultraviolet light absorber to the styrene-butadiene-styrene block copolymer in the third mixture is 1:110;

[0043] S4, heating and stirring the first mixture and the second mixture respectively;

[0044] S5, performing vacuum treatment on the third mixture, wherein the vacuum treatment time is 25-35 minutes;

[0045] S6, mixing the first mixture in S4, the second mixture and the third mixture in S5 to obtain a hot melt pressure-sensitive adhesive mixture;

[0046] S7, coating the hot melt pressure-sensitive adhesive mixture with the corresponding plaster composition to obtain a finished product.

[0047] Among them, the mass ratio of the first mixture, the second mixture and the third mixture is 80:1:120.

[0048] The olefin copolymer containing α-olefin is selected from at least one of an amorphous α-olefin copolymer and a polyolefin elastomer POE; and the 25° C. toluene solution viscosity of the styrene-butadiene-styrene block copolymer is 1500 CPS.

[0049] The plasticizer is cyclohexane oil prepared by a three-stage high-pressure hydrogenation process, and the ultraviolet light absorber is at least one of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate.

[0050] The composite antioxidant is at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris[2,4-di-tert-butylphenyl]phosphite; the composite light stabilizer is a hindered phenol antioxidant; the plasticizer is at least one of cycloalkyl rubber softening oil and liquid polyisobutylene rubber, and the viscosity of the plasticizer at 40°C is 150CPS.

[0051] As an application of this embodiment:

[0052] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A method for preparing a plaster using a hot melt pressure-sensitive adhesive, characterized in that: The preparation method comprises the following steps: S1, first mixing an olefin copolymer containing α-olefin and a hydrogenated synthetic rubber to obtain a first mixture; S2, mixing the composite antioxidant, the composite light stabilizer, and the plasticizer for a second time to obtain a second mixture; S3, mixing the ultraviolet light absorber and the styrene-butadiene-styrene block copolymer for a third time to obtain a third mixture; S4, heating and stirring the first mixture and the second mixture respectively; S5, vacuum-treating the third mixture; S6, mixing the first mixture in S4, the second mixture and the third mixture in S5 to obtain a hot melt pressure-sensitive adhesive mixture; S7, coating the hot melt pressure-sensitive adhesive mixture with the corresponding plaster composition to obtain a finished product.

2. The method for preparing a hot melt pressure sensitive adhesive plaster according to claim 1, characterized in that: The mass ratio of the olefin copolymer containing α-olefin to the hydrogenated synthetic rubber in the first mixture is 1:2.

5.

3. The method for preparing a hot melt pressure sensitive adhesive plaster according to claim 1, characterized in that: The mass ratio of the composite antioxidant, the composite light stabilizer and the plasticizer in the second mixture is 1:2:

1.

4. The method for preparing a hot melt pressure sensitive adhesive plaster according to claim 1, characterized in that: The mass ratio of the ultraviolet light absorber to the styrene-butadiene-styrene block copolymer in the third mixture is 1:

110.

5. The method for preparing a hot melt pressure sensitive adhesive plaster according to claim 1, characterized in that: The mass ratio of the first mixture, the second mixture and the third mixture is 80:1:

120.

6. The method for preparing a hot melt pressure sensitive adhesive plaster according to claim 1, characterized in that: The olefin copolymer containing α-olefin is selected from at least one of amorphous α-olefin copolymer and polyolefin elastomer POE; the 25° C. toluene solution viscosity of the styrene-butadiene-styrene block copolymer is 1000-1500 CPS.

7. The method for preparing a hot melt pressure sensitive adhesive plaster according to claim 1, characterized in that: The plasticizer is cyclohexane oil prepared by a three-stage high-pressure hydrogenation process, and the ultraviolet light absorber is at least one of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole and bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate.

8. The method for preparing a hot melt pressure sensitive adhesive plaster according to claim 1, characterized in that: The composite antioxidant is at least one of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester and tris[2,4-di-tert-butylphenyl]phosphite; the composite light stabilizer is a hindered phenol antioxidant; the plasticizer is at least one of cycloalkyl rubber softening oil and liquid polyisobutylene rubber, and the viscosity of the plasticizer at 40° C. is 50 to 150 CPS.

Images