Inner layer raw material of antibacterial and antiviral self-adhesive TPE film and preparation method thereof

Abstract

The present invention provides an inner layer raw material of an antibacterial and antiviral self-adhesive TPE film and a preparation method thereof, comprising the following components by weight: styrene elastomer: 30-60%; naphthenic oil: 5-10%; tackifier: 15-50%; silver antibacterial agent: 0.2-0.5%; isolation agent: 0.2-0.3%; other additives: 0.2-0.5%. The silver antibacterial agent with silicate as a carrier of the present invention has the characteristics of high safety, high antibacterial efficacy, good heat resistance, long-lasting antibacterial, convenient processing, non-toxic and harmless. And silicate as a carrier does not affect the transparency of the material, so that the self-adhesive film has efficient antibacterial and antiviral properties. The present invention successfully develops a TPE film with high antibacterial and antiviral performance, high adhesion and excellent mechanical properties through the scientific design of the formula system and the optimization of the preparation process. Its technical advantages are significant, and it can meet the application requirements of medical and food packaging with strict requirements on safety, environmental protection and performance, and has high market value and promotion potential.

Description

Technical Field

[0001] The invention relates to the technical field of self-adhesive TPE films, in particular to an inner layer raw material of an antibacterial and antiviral self-adhesive TPE film and a preparation method thereof. Background Art

[0002] Self-adhesive protective film is a kind of film with self-adhesive surface used to protect vulnerable surfaces or easily dirty surfaces. It is used to prevent the protected substrate surface from being damaged or contaminated during transportation, assembly, or processing. The protective film will remain on the surface of the protected substrate until the product is delivered to the user and then torn off and discarded. Self-adhesive protective film has a wide range of applications and can be used on the surfaces of different products, such as household appliances, transportation vehicles, electronic products, decoration panels, and building materials, etc. For products, there are requirements for antibacterial and antiviral properties, such as medical devices and consumables.

[0003] Unlike ordinary packaging, many medical devices need to be kept under sterile conditions before use to avoid medical infection accidents caused by medical materials and equipment. Therefore, the antibacterial performance requirements of medical packaging bags are very strict. For general packaging bags, sterilization operations are required, and the commonly used high-temperature sterilization method will affect the mechanical properties of packaging materials. Patent No. 202011515968.X "A high-transparent self-adhesive film and its processing method" provides a self-adhesive film with antibacterial function and its processing method. However, the chitosan used in this patent as an antibacterial agent has a poor antibacterial effect, and the self-adhesive layer is only low-density polyethylene and linear low-density polyethylene materials, and its bonding effect is general. Patent No. CN 114539944 A "A new type of environmentally friendly self-adhesive film and its synthesis method" provides a new type of environmentally friendly self-adhesive film production method. The self-adhesive layer is prepared by using modified SEBS, antioxidants and flow improvers. SEBS alone is limited to provide viscosity for the self-adhesive layer, and it cannot meet the requirements in many application scenarios that require high initial viscosity and stable sustained viscosity. Summary of the invention

[0004] The purpose of the present invention is to provide an inner layer raw material of an antibacterial and antiviral self-adhesive TPE film and a preparation method thereof, so as to solve the technical problems of the background technology).

[0005] To achieve the above object, the present invention proposes the following technical solution: an inner layer raw material of an antibacterial and antiviral self-adhesive TPE film, comprising the following components in parts by weight:

[0006] Styrene elastomer: 30-60%;

[0007] Naphthenic oil: 5-10%;

[0008] Tackifier: 15-50%;

[0009] Silver antibacterial agent: 0.2-0.5%;

[0010] Release agent: 0.2-0.3%;

[0011] Other additives: 0.2-0.5%.

[0012] Furthermore, in the present invention, the styrene elastomer is SBS, SEBS, SIS, SEPS or a mixture of two or more elastomers.

[0013] Furthermore, in the present invention, the tackifier is C5 petroleum resin, C9 petroleum resin, terpene resin, modified rosin resin, etc., or a mixture of two or more thereof.

[0014] Furthermore, in the present invention, the silver-based antibacterial agent is a silver-based antibacterial agent with a silicate carrier.

[0015] Furthermore, in the present invention, the isolation agent is nano-silicon dioxide synthesized in the gas phase.

[0016] Furthermore, in the present invention, the other auxiliary agents include antioxidants and stabilizers.

[0017] A method for preparing an inner layer material of an antibacterial and antiviral self-adhesive TPE film, using the inner layer material of the antibacterial and antiviral self-adhesive TPE film mentioned above, the preparation method comprises the following steps:

[0018] Step 1, the mixing method is as follows: after mixing the styrene elastomer resin and the cyclohexane oil in proportion, let it stand for 30 minutes to 60 minutes to allow the resin to fully absorb the cyclohexane oil; after the resin completely absorbs the cyclohexane oil, the silver antibacterial agent and other additives are fully mixed with a mixer;

[0019] Step 2, extrusion granulation: preheat the twin-screw extruder according to the process parameters; put the mixed material and viscosity enhancer in step 1 into different loss-in-weight scale silos respectively, and set the feeding speed of the loss-in-weight scale according to the formula ratio; granulate according to the set main engine speed, output and pelletizing speed;

[0020] Step 3, drying, breaking up, and packaging, drying the extruded particles at 90°C / 2h; because the surface of the particles is very sticky and easy to agglomerate, a high-speed mixer with cooling is used and an isolation agent is added to mix and break up to reduce the stickiness of the particle surface; packing, weighing, sealing, and packaging.

[0021] Beneficial effects: The technical solution of this application has the following technical effects:

[0022] 1. The silver-based antibacterial agent with silicate as carrier of the present invention has the characteristics of high safety, high antibacterial efficacy, good heat resistance, long-lasting antibacterial, convenient processing, non-toxic and harmless. And the use of silicate as carrier does not affect the transparency of the material, so that the self-adhesive film has high antibacterial and antiviral properties. By adjusting the type and addition ratio of the tackifying resin, the viscosity of the material can be adjusted according to the actual application conditions and scenarios.

[0023] 2. Adding naphthenic oil to the formulation system can effectively improve the compatibility of tackifying resin and styrene elastomer, increase the viscosity of the material, and adjust the melt index and hardness of the material. Naphthenic oil is a petroleum fraction with cycloalkane as the main component. Cycloalkane is a saturated hydrocarbon, and the carbon atoms in its molecules are interconnected by single bonds and double bonds. It has a cycloalkane structure similar to aromatic carbon and a branched structure similar to straight-chain carbon, and the cycloalkane ratio is higher than 40%. Based on the principle of similar compatibility and the matching of molecular structure, it has good compatibility with styrene elastomer. There are also a large number of polar groups such as double bonds and carboxyl groups in the tackifying resin (petroleum resin, rosin resin, terpene resin), which make the tackifying resin have a certain polarity, can interact with naphthenic oil, thereby showing good compatibility and reactivity with styrene elastomer, changing the chemical structure of the self-adhesive material, increasing the degree of crosslinking, changing the molecular diversity, introducing polar groups, effectively improving cohesion, and thus enhancing adhesive properties.

[0024] 3. The use of gas-phase synthesized nano-silicon dioxide can reduce the surface viscosity of the particles without affecting the viscosity of the finished self-adhesive film, making it more convenient for packaging, transportation and co-extrusion molding of the self-adhesive film.

[0025] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0026] The foregoing and other aspects, embodiments and features of the present invention will be more fully understood from the following description. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or will be learned from the practice of the specific embodiments according to the present invention. DETAILED DESCRIPTION

[0027] In order to better understand the technical content of the present invention, specific embodiments are specifically described as follows. The embodiments of the present disclosure are not necessarily defined in all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those concepts and embodiments described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed by the present invention are not limited to any implementation. In addition, some aspects disclosed by the present invention can be used alone, or used in any appropriate combination with other aspects disclosed by the present invention.

[0028] Example 1

[0029] The inner layer raw material of an antibacterial and antiviral self-adhesive TPE film comprises the following components by weight: 55% of SEBS, 5% of naphthenic oil, 30% of tackifying resin, 0.5% of silver antibacterial agent, 0.3% of antioxidant, 0.2% of other auxiliary agents and 0.3% of isolating agent.

[0030] A method for preparing an inner layer material of an antibacterial and antiviral self-adhesive TPE film, step 1, a mixing method is as follows: after mixing a styrene elastomer resin and cyclopentane oil in proportion, let it stand for 30 minutes to 60 minutes to allow the resin to fully absorb the cyclopentane oil; after the resin completely absorbs the cyclopentane oil, a silver-based antibacterial agent and other additives are fully mixed with a mixer;

[0031] Step 2, extrusion granulation: preheat the twin-screw extruder according to the process parameters; put the mixed material and viscosity enhancer in step 1 into different loss-in-weight scale silos respectively, and set the feeding speed of the loss-in-weight scale according to the formula ratio; granulate according to the set main engine speed, output and pelletizing speed;

[0032] Step 3, drying, breaking up, and packaging, drying the extruded particles at 90°C / 2h; because the surface of the particles is very sticky and easy to agglomerate, a high-speed mixer with cooling is used and an isolation agent is added to mix and break up to reduce the stickiness of the particle surface; packing, weighing, sealing, and packaging.

[0033] Example 2

[0034] An inner layer raw material of an antibacterial and antiviral self-adhesive TPE film comprises the following components by weight: SIS 55%, naphthenic oil 5%, tackifying resin 30%, silver antibacterial agent 0.5%, antioxidant 0.3%, other auxiliary agents 0.2%, and isolation agent 0.3%. A preparation method of the inner layer raw material of an antibacterial and antiviral self-adhesive TPE film is the same as that of Example 1.

[0035] Example 3

[0036] An inner layer raw material of an antibacterial and antiviral self-adhesive TPE film comprises the following components by weight: 55% SBS, 5% naphthenic oil, 30% tackifying resin, 0.5% silver antibacterial agent, 0.3% antioxidant, 0.2% other auxiliary agents, and 0.3% isolation agent. A preparation method of an inner layer raw material of an antibacterial and antiviral self-adhesive TPE film is the same as that of Example 1.

[0037] Example 4

[0038] An inner layer material of an antibacterial and antiviral self-adhesive TPE film comprises the following components by weight: 55% SEBS, 5% naphthenic oil, 25% tackifying resin, 0.5% silver antibacterial agent, 0.3% antioxidant, 0.2% other auxiliary agents, and 0.3% isolation agent. A method for preparing an inner layer material of an antibacterial and antiviral self-adhesive TPE film is the same as that of Example 1.

[0039] Comparative Example 1

[0040] An inner layer material of an antibacterial and antiviral self-adhesive TPE film comprises the following components by weight: 55% SEBS, 30% tackifying resin, 0.5% silver antibacterial agent, 0.3% antioxidant, 0.2% other auxiliary agents, and 0.3% isolation agent. A method for preparing an inner layer material of an antibacterial and antiviral self-adhesive TPE film is the same as that of Example 1.

[0041] Comparative Example 2

[0042] An inner layer material of an antibacterial and antiviral self-adhesive TPE film comprises the following components by weight: 55% SEBS, 5% naphthenic oil, 30% tackifying resin, 0.3% antioxidant, 0.2% other auxiliary agents, and 0.3% isolation agent. A method for preparing an inner layer material of an antibacterial and antiviral self-adhesive TPE film is the same as that of Example 1.

[0043]

[0044] Examples 1, 2, and 3 verify different types of styrene elastomers

[0045] Comparative Example 1: No naphthenic oil was added, and the rest was the same as Example 1;

[0046] Comparative Example 2: No silver antibacterial agent was added, and the rest was the same as Example 1;

[0047] Test methods and standards

[0048] (1) Hardness: Tested in accordance with ISO868, test conditions: 15s;

[0049] (2) Tensile strength and elongation at break: tested in accordance with ISO37, test condition 200 mm / min;

[0050] (3) Fastness: Injection molded 120×15×2 mm specimens, press the specimens onto an acrylic plate using a 2 kg tape roller, test conditions 50 mm / min;

[0051] (4) Antibacterial properties: Passed GB / T 31402-2023 Determination of antibacterial activity on the surface of plastics and other non-porous materials;

[0052] (5) Antiviral: GB / T 43355-2023 Determination of antiviral activity on the surface of plastics and other non-porous materials; Test results:

[0053]

[0054] Through testing, it can be found that the product prepared by the present invention has good mechanical properties and high permeability and high viscosity. In addition, its surface also has antibacterial and antiviral properties.

[0055] The present invention has excellent antibacterial and antiviral properties. The present invention uses a silver-based antibacterial agent with silicate as a carrier, which is highly effective in antibacterial and antiviral. In the test, the antibacterial rate and antiviral activity both reached 99.99%, indicating that it can effectively inhibit the growth and spread of a variety of bacteria and viruses. Durability: The stability of the silver-based antibacterial agent allows the antibacterial effect to be maintained for a long time. It has high transparency, and the silicate carrier does not affect the transparency of the film, and is suitable for application scenarios that require high light transmittance. It is environmentally friendly and safe, non-toxic and harmless, meets environmental protection requirements, and is suitable for medical and food packaging fields with high safety requirements.

[0056] The present invention has excellent mechanical properties. Mechanical property tests show that the hardness is moderate. The hardness value of the embodiment ranges from 28A to 36A, which satisfies the balance between the softness and hardness of the self-adhesive film. The tensile strength and elongation at break are good, the highest tensile strength reaches 8.6MPa, and the elongation at break exceeds 1400%, showing good ductility and toughness. The fastness is high, and the fastness test value reaches up to 31N, reflecting excellent adhesion performance.

[0057] The present invention has an optimized formula system. The addition of cyclohexane oil improves the compatibility of styrene elastomers and tackifying resins, which helps to enhance the viscosity of the material. By adjusting the melt index and hardness, the adaptability of the material in processing and actual use is increased. The type and proportion of tackifying resins are adjusted: C5 petroleum resin, C9 petroleum resin and other types are diverse and flexible to use, and the viscosity and other properties can be adjusted according to the actual application scenario. The addition of antioxidants and stabilizers improves the thermal stability and aging resistance of the material. The use of an isolating agent (nano-silica) effectively reduces the viscosity of the particle surface, avoids agglomeration, and facilitates storage, transportation and processing.

[0058] The preparation process of the invention is efficient, and the twin-screw extrusion process is adopted to achieve efficient mixing and granulation of raw materials: each component is accurately mixed in proportion to ensure the stability of product performance. The combination of high-speed mixing and cooling equipment solves the problem of particle surface stickiness, making packaging and transportation more convenient.

[0059] The present invention adopts a non-toxic and harmless material system and a safe antibacterial agent to make the product meet environmental protection standards and help reduce environmental burden. The optimization of the formula and the high efficiency of the process reduce the production cost and have good market competitiveness.

[0060] The present invention aims to develop a self-adhesive material with high antibacterial and antiviral properties, which is used in fields with high antibacterial and antiviral requirements such as medical treatment and food packaging. Through the introduction of silver-based antibacterial agents, the film can effectively kill bacteria and viruses to ensure the safety of products and users. High adhesion and good processability are achieved. The synergistic effect of styrene elastomers, tackifying resins, and cyclopentane oils in the formula makes the film highly permeable and highly viscous, and suitable for a variety of surfaces. The optimization of self-adhesive properties and mechanical properties enables it to fit firmly and meet the needs of different application scenarios. It meets the application needs of multiple fields, and its high transparency and high viscosity make it suitable for medical protective equipment, electronic product packaging, food packaging and other fields. Excellent mechanical properties and antibacterial and antiviral effects provide reliable solutions for special uses. , promote sustainable development, use safe and environmentally friendly material systems, reduce the impact on the environment, and provide sustainable solutions for the high-demand health protection field.

[0061] The present invention has successfully developed a TPE film with high antibacterial and antiviral properties, high adhesion and excellent mechanical properties through scientific design of the formula system and optimization of the preparation process. It has significant technical advantages and can meet the application requirements of medical and food packaging that have strict requirements on safety, environmental protection and performance, and has high market value and promotion potential.

[0062] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. An inner layer material of an antibacterial and antiviral self-adhesive TPE film, characterized by: The composition comprises the following components in parts by weight: Styrene elastomer: 30-60%; Naphthenic oil: 5-10%; Tackifier: 15-50%; Silver antibacterial agent: 0.2-0.5%; Release agent: 0.2-0.3%; Other additives: 0.2-0.5%.

2. The inner layer material of the antibacterial and antiviral self-adhesive TPE film according to claim 1, characterized in that: The styrene elastomer is SBS, SEBS, SIS, SEPS or a mixture of two or more elastomers.

3. The inner layer material of the antibacterial and antiviral self-adhesive TPE film according to claim 1, characterized in that: The tackifier is C5 petroleum resin, C9 petroleum resin, terpene resin, modified rosin resin, etc., or a mixture of two or more thereof.

4. The inner layer material of the antibacterial and antiviral self-adhesive TPE film according to claim 1, characterized in that: The silver-based antibacterial agent is a silicate-based antibacterial agent.

5. The inner layer material of the antibacterial and antiviral self-adhesive TPE film according to claim 1, characterized in that: The isolation agent is nano silicon dioxide synthesized in gas phase.

6. The inner layer material of the antibacterial and antiviral self-adhesive TPE film according to claim 1, characterized in that: The other additives include antioxidants and stabilizers.

7. A method for preparing an inner layer material of an antibacterial and antiviral self-adhesive TPE film, characterized in that: The inner layer raw material of the antibacterial and antiviral self-adhesive TPE film according to any one of claims 1 to 6 is selected, and the preparation method comprises the following steps: Step 1, the mixing method is as follows: after mixing the styrene elastomer resin and the cyclohexane oil in proportion, let it stand for 30 minutes to 60 minutes to allow the resin to fully absorb the cyclohexane oil; after the resin completely absorbs the cyclohexane oil, the silver antibacterial agent and other additives are fully mixed with a mixer; Step 2, extrusion granulation: preheat the twin-screw extruder according to the process parameters; put the mixed material and viscosity enhancer in step 1 into different loss-in-weight scale silos respectively, and set the feeding speed of the loss-in-weight scale according to the formula ratio; granulate according to the set main engine speed, output and pelletizing speed; Step 3, drying, breaking up, and packaging, drying the extruded particles at 90°C / 2h; because the surface of the particles is very sticky and easy to agglomerate, a high-speed mixer with cooling is used and an isolation agent is added to mix and break up to reduce the stickiness of the particle surface; packing, weighing, sealing, and packaging.

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