Antibacterial cold and high temperature resistant PP material and preparation method thereof

Abstract

The application relates to an antibacterial cold-resistant and high-temperature-resistant PP material, which comprises the following components in parts by weight: PP resin, 0.5-2 parts of compounded antibacterial agent, 1-5 parts of a compatilizer, 0.5-3 parts of a functional additive, 5-15 parts of a filling modifier, 3-10 parts of a compounded toughening agent, 0.5-1 part of a compounded weathering agent, 0.5-1 part of a compounded antioxidant, and the like. The application has the advantages that the nano silver and the nano zinc oxide are used to realize synergistic antibacterial effect, the POE and the SEBS are compounded to realize toughening, the compounded antioxidant and the weathering agent are used to improve the heat resistance and the weathering resistance, the high-efficiency compatilizer is used, the material has the advantages of wide-spectrum antibacterial effect, excellent cold resistance, high-temperature resistance and good mechanical properties, the preparation process is simple, the material is suitable for large-scale production, and the material is suitable for pet products.

Description

Technical Field

[0001] This invention relates to the field of engineering materials technology, and in particular to an antibacterial, cold-resistant, and high-temperature-resistant PP material and its preparation method. Background Technology

[0002] Polypropylene (PP) is a widely available, inexpensive, and excellent-processing thermoplastic that is used in a variety of fields.

[0003] For pet supplies, the main material requirements for pet cages, food bowls, toys, and pet appliance shells are safety, non-toxicity, long-lasting antibacterial properties, resistance to high and low temperatures, and resistance to chewing and aging. However, ordinary PP materials have defects such as poor low-temperature toughness, insufficient heat stability, and lack of antibacterial function, which limits their use in outdoor low-temperature environments, high-temperature usage scenarios, and applications with high hygiene requirements.

[0004] In existing technologies, antibacterial PP materials mostly use a single antibacterial agent, which is insufficient in terms of broad-spectrum antibacterial activity and long-term effectiveness; cold-resistant modification often uses a single toughening agent, which has limited improvement in low-temperature impact resistance; high-temperature and weather-resistant systems lack efficient compounding, and the materials are prone to aging, discoloration, and decline in mechanical properties under long-term high and low temperature alternation and light exposure.

[0005] Modification with a single additive is difficult to simultaneously meet the performance requirements of antibacterial, cold resistance, high temperature resistance, and weather resistance. Some compound systems have problems such as poor compatibility, significant degradation of mechanical properties, and poor durability of antibacterial effect.

[0006] Ordinary PP materials still have the following defects: 1. Brittleness increases significantly at low temperatures, and impact resistance decreases; 2. Insufficient thermal stability during high-temperature use, making it prone to aging and deformation; 3. The material itself does not have antibacterial properties, making it difficult to meet the requirements of applications with high hygiene standards; 4. When multiple functional additives are used together, problems such as poor compatibility and mutual weakening of performance may easily occur.

[0007] Therefore, in order to solve the problem that existing technologies often use a single antibacterial agent, a single toughening agent, or a single weather-resistant system, it is difficult to simultaneously achieve antibacterial, cold-resistant, high-temperature-resistant, and mechanical properties.

[0008] Therefore, it is necessary to develop a multifunctional synergistic PP material. Summary of the Invention

[0009] The purpose of this invention is to provide an antibacterial, cold-resistant, and high-temperature-resistant PP material and its preparation method, so as to solve the problems of limited functionality and poor environmental adaptability of existing PP materials.

[0010] To achieve the above objectives, the present invention provides the following technical solution.

[0011] An antibacterial, cold-resistant, and high-temperature-resistant PP material, wherein the material comprises the following components by weight: 65-90 parts of PP resin; Mix 0.5-2 parts of the antibacterial agent; 1-5 parts compatibilizer; Functional additives: 0.5-3 parts; 5-15 parts of filler modifier; Compound toughening agent 3-10 parts; Mix 0.5-1 part of a weather-resistant agent; Add 0.5-1 part of compound antioxidant; Wherein: the compound antibacterial agent is a mixture of nano silver and nano zinc oxide in a mass ratio of 1:2-1:4; The compatibilizer is GMA grafted with POE; The functional additive is a polysiloxane; The compound toughening agent is a mixture of POE and SEBS in a mass ratio of 1.5:1 to 3:1. The compound weathering agent is composed of UV234 and UV770 in a mass ratio of 1:1 to 2:1. The compound antioxidant is composed of antioxidant 626 and antioxidant 1098 in a mass ratio of 0.5:1 to 2:1.

[0012] Preferably, the PP resin is homopolymer polypropylene or copolymer polypropylene with a melt index of 5-30 g / 10 min.

[0013] Preferably, the filler modifier is one or more of talc, calcium carbonate, and barium sulfate, with a particle size of 800-3000 mesh.

[0014] A method for preparing the antibacterial, cold-resistant, and high-temperature-resistant PP material, characterized by comprising the following steps: S1. Weigh out the PP resin, compound antibacterial agent, compatibilizer, functional additive, filler modifier, compound toughening agent, compound weathering agent and compound antioxidant according to the formula ratio; S2. Add each component to a high-speed mixer for premixing for 5-10 minutes at a speed of 300-800 r / min to obtain a premix. S3. Add the premixed material to a twin-screw extruder, melt-blend and then extrude into strips. After cooling, air-drying and pelletizing, antibacterial, cold-resistant and high-temperature resistant PP material granules are obtained.

[0015] Preferably, the temperatures of each temperature zone of the twin-screw extruder are as follows: Zone 1: 170-175℃; Zone 2: 175-185℃; Zone 3: 185-195℃; Zone 4: 195-205℃; Zone 5: 205-210℃; The head temperature is 210℃.

[0016] Preferably, the twin-screw extruder has a main engine speed of 200-400 r / min and a feeding rate of 10-30 kg / h.

[0017] Compared with the prior art, the present invention has the following advantages: 1. Nano-silver and nano-zinc oxide form a synergistic antibacterial system, exhibiting broad-spectrum and highly effective inhibitory effects against bacteria; 2. POE and SEBS are combined for toughening, and POE is grafted onto GMA to improve interfacial bonding, so that the material still has excellent toughness at low temperatures; 3. Antioxidants and weathering agents work synergistically to improve high-temperature stability and aging resistance; 4. Filler modifiers improve material rigidity and dimensional stability while maintaining good processing fluidity; 5. The process is simple, suitable for twin-screw continuous extrusion, and suitable for industrial production; 6. When used in pet products, this material meets the requirements of being safe and non-toxic, having long-lasting antibacterial properties, being resistant to high and low temperatures, being resistant to chewing and aging, and being suitable for pet cages, food bowls, toys, pet appliance shells, etc., taking into account both hygiene and safety and durability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process of the present invention.

[0019] Figure 2 This is a physical image of the material used in this invention.

[0020] Figure 3 This is a performance comparison test data table for the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] An antibacterial, cold-resistant, and high-temperature-resistant PP material, comprising, by weight: 65-90 parts PP resin, 0.5-2 parts compound antibacterial agent, 1-5 parts compatibilizer, 0.5-3 parts functional additive, 5-15 parts filler modifier, 3-10 parts compound toughening agent, 0.5-1 part compound weathering agent, and 0.5-1 part compound antioxidant.

[0023] The compound antibacterial agent is nano-silver + nano-zinc oxide; the compatibilizer is GMA-grafted POE; the functional additive is polysiloxane; the toughening agent is POE + SEBS; the weathering agent is UV234 + UV770; and the antioxidant is 626 + 1098.

[0024] The PP is homopolymer PP or copolymer PP, with a melt index of 5-30 g / 10 min (230℃, 2.16 kg).

[0025] The filler modifier is one or more of talc, calcium carbonate, and barium sulfate, with a particle size of 800-3000 mesh. Example

[0026] Take by weight: 75 PP sheets; One part of compound antibacterial agent; Three copies of POE grafted onto GMA; 1 part polysiloxane; 10 parts talcum powder; Compound toughening agent 6 parts; 0.8 parts of compound weather-resistant agent; 0.8 parts of compound antioxidant.

[0027] Preparation steps: 1. Mix at 500 rpm for 8 minutes in a high-speed mixer; 2. Twin-screw extrusion granulation; 3. The temperature zones are 170℃, 180℃, 190℃, 200℃, and 210℃, with the machine head at 210℃; 4. The main unit speed is 300 r / min.

[0028] The resulting material has the following characteristics: antibacterial rate ≥99.5%; impact strength at -30℃ ≥15kJ / m²; heat distortion temperature ≥110℃. Example

[0029] 80 PP sheets; 1.5 parts of compound antibacterial agent; Two copies of POE grafted onto GMA; 1.5 parts of polysiloxane; 8 parts calcium carbonate; Five parts of compound toughening agent; 0.7 parts of compound weather-resistant agent; 0.7 parts of compound antioxidant.

[0030] The remaining processes are the same as in Example 1. Example

[0031] 70 PP sheets; 0.8 parts of compound antibacterial agent; Four copies of POE grafted onto GMA; 2 parts polysiloxane; 12 parts of barium sulfate; Compound toughening agent 8 parts; 0.9 parts of compound weather-resistant agent; 0.9 parts of compound antioxidant.

[0032] The remaining processes are the same as in Example 1.

[0033] In addition to the above three sets of embodiments, comparative example 1 using a single antibacterial agent, comparative example 2 using an antioxidant and a weathering agent, and comparative example 3 using a single toughening agent were also set up.

[0034] Performance test results Figure 3 As shown in Comparative Example 1, the antibacterial performance after using a single antibacterial agent is 97.3%, which is lower than 99.5%. Comparative Example 2 shows that after using antioxidants and weathering agents, the tensile strength retention rate after aging is 86.8%, which is lower than 90%. Comparative Example 3 shows that after using a single toughening agent, the impact strength at -30℃ is 14 KJ / M2, which is lower than that of the compounded agent.

[0035] The material of this invention has been tested and found to have the following properties: 1. Antibacterial properties: Inhibition rate against Escherichia coli and Staphylococcus aureus ≥99.5%; 2. Cold resistance: Impact strength of the cantilever beam at -30℃ ≥15kJ / m²; 3. Heat resistance: Heat distortion temperature (0.45MPa) ≥110℃; 4. Weather resistance: After aging with xenon lamps for 1000 hours, the tensile strength retention rate is ≥90%, with no obvious discoloration or chalking.

[0036] The material of this invention is suitable for pet products. It is safe, non-toxic, antibacterial, long-lasting, resistant to high and low temperatures, and resistant to chewing and aging. It is suitable for pet cages, food bowls, toys, pet appliance shells, and other applications, taking into account both hygiene and safety as well as durability.

[0037] The above is a detailed description of the present invention in conjunction with specific embodiments, and it should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, any equivalent substitutions or obvious modifications made without departing from the concept of the present invention, and which have the same performance or use, should be considered to fall within the patent protection scope defined by the submitted claims.

Claims

1. An antibacterial, cold-resistant, and high-temperature-resistant PP material, characterized in that: The material, by weight, comprises the following components: 65-90 parts of PP resin; Mix 0.5-2 parts of the antibacterial agent; 1-5 parts compatibilizer; Functional additives: 0.5-3 parts; 5-15 parts of filler modifier; Compound toughening agent 3-10 parts; Mix 0.5-1 part of a weather-resistant agent; Add 0.5-1 part of compound antioxidant; Wherein: the compound antibacterial agent is a mixture of nano silver and nano zinc oxide in a mass ratio of 1:2-1:4; The compatibilizer is GMA grafted with POE; The functional additive is a polysiloxane; The compound toughening agent is a mixture of POE and SEBS in a mass ratio of 1.5:1 to 3:

1. The compound weathering agent is composed of UV234 and UV770 in a mass ratio of 1:1 to 2:

1. The compound antioxidant is composed of antioxidant 626 and antioxidant 1098 in a mass ratio of 0.5:1 to 2:

1.

2. The antibacterial, cold-resistant, and high-temperature-resistant PP material according to claim 1, characterized in that: The PP resin is homopolymer polypropylene or copolymer polypropylene with a melt index of 5-30 g / 10 min.

3. The antibacterial, cold-resistant, and high-temperature-resistant PP material according to claim 1, characterized in that: The filler modifier is one or more of talc, calcium carbonate, and barium sulfate, with a particle size of 800-3000 mesh.

4. A method for preparing an antibacterial, cold-resistant, and high-temperature-resistant PP material as described in any one of claims 1-3, characterized in that: Includes the following steps: S1. Weigh out the PP resin, compound antibacterial agent, compatibilizer, functional additive, filler modifier, compound toughening agent, compound weathering agent and compound antioxidant according to the formula ratio; S2. Add each component to a high-speed mixer for premixing for 5-10 minutes at a speed of 300-800 r / min to obtain a premix. S3. Add the premixed material to a twin-screw extruder, melt-blend and then extrude into strips. After cooling, air-drying and pelletizing, antibacterial, cold-resistant and high-temperature resistant PP material granules are obtained.

5. The method for preparing the antibacterial, cold-resistant, and high-temperature-resistant PP material according to claim 4, characterized in that: The temperatures of each temperature zone of the twin-screw extruder are as follows: Zone 1: 170-175℃; Zone 2: 175-185℃; Zone 3: 185-195℃; Zone 4: 195-205℃; Zone 5: 205-210℃; The head temperature is 210℃.

6. The method for preparing the antibacterial, cold-resistant, and high-temperature-resistant PP material according to claim 4, characterized in that: The twin-screw extruder has a main engine speed of 200-400 r / min and a feeding rate of 10-30 kg / h.

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