CN118256038A - Modified polypropylene material and preparation method thereof - Google Patents

Abstract

The invention discloses a modified polypropylene material and a preparation method thereof, which is prepared from 70.9-98.5 parts of polypropylene, 0-20 parts of inorganic filler, 0.3-0.6 parts of antibacterial agent, 0.5-5 parts of toner, 0.2-2 parts of astaxanthin, 0.2-0.6 parts of antioxidant, 0.2-0.6 parts of light stabilizer, and 0.1-0.3 parts of processing aid. The invention proposes for the first time to add astaxanthin as an auxiliary agent in the polypropylene modified formula to improve the dispersibility and weather resistance of various auxiliary agents and fillers of the material, so as to prepare polypropylene household appliance products with excellent comprehensive performance.

Description

A modified polypropylene material and preparation method thereof

Technical Field

The invention belongs to the field of polymer materials, and in particular relates to a polypropylene material and a preparation method thereof.

Background technique

Polypropylene materials are widely used in household appliances, electronic and electrical products due to their excellent mechanical properties and low price. With the improvement of people's quality of life and the increasing functionality of products, the comprehensive performance of polypropylene materials has been significantly improved.

Therefore, polypropylene needs to be modified, such as adding inorganic fillers to enhance its mechanical strength, adding color powder to enhance its appearance, or using antistatic agents to eliminate static electricity in PP, and adding antibacterial agents to enhance its antibacterial properties. However, antibacterial agents, inorganic fillers, color powders, etc. are not easy to disperse in PP materials, resulting in the final modified polypropylene material performance not reaching the ideal level.

Summary of the invention

In view of this, it is necessary for the present invention to provide a functionalized polypropylene material with excellent comprehensive performance and a preparation method thereof. In the present invention, astaxanthin is added as a modification aid, which has the functions of aiding dispersion and aiding aging performance.

In order to achieve the above object, the present invention adopts the following technical solutions:

A modified polypropylene material is prepared from the following components by weight: 72.5-98.5 parts of polypropylene, 0-20 parts of inorganic filler, 0.3-0.6 parts of antibacterial agent, 0.5-5 parts of color powder, 0.2-2 parts of astaxanthin, 0.2-0.6 parts of antioxidant, 0.2-0.6 parts of light stabilizer and 0.1-0.3 parts of processing aid.

In a further embodiment, the polypropylene is at least one of copolymer polypropylene and homopolymer polypropylene.

In a further embodiment, the inorganic filler is at least one of talc, barium sulfate and calcium carbonate.

In a further embodiment, the antibacterial agent is an inorganic antibacterial agent, which is mainly composed of a compound of silver and zinc compounds.

In a further embodiment, the toner is an inorganic toner or an organic toner, such as titanium dioxide, carbon black, iron oxide red, phthalocyanine blue, phthalocyanine green, etc., mixed in any proportion.

In a further embodiment, the astaxanthin is 3,3′-dihydroxy-4,4′-diketo-β,β′-carotene powder.

In a further embodiment, the antioxidant is a composition of histamine, hindered phenol, and phosphite antioxidant in any proportion.

In a further embodiment, the photostabilizer is a histamine-sensitive photostabilizer.

In a further embodiment, the light stabilizer is a processing aid such as a silicone dispersant or a stearate dispersant.

Another object of the present invention is to provide a method for preparing the modified polypropylene material. Polypropylene, inorganic filler, antibacterial agent, color powder, astaxanthin, antioxidant, light stabilizer and processing aid are added to a high mixer according to weight ratio and dry mixed for 5-10 minutes at 40°C-80°C. The mixture is then added to a twin-screw extruder for melt extrusion and granulation to obtain a modified polypropylene material, wherein the temperature of zone 1 of the twin-screw extruder is 170-190°C, zone 2 is 180-220°C, zone 3 is 190-230°C, zone 4 is 200-230°C; zone 5 is 200-240°C.

Astaxanthin is a keto-carotenoid commonly found in aquatic organisms and bird feathers. The natural astaxanthin molecule contains 4 isoprene double bonds connected end to end, a total of 11 conjugated double bonds and unsaturated ketones and hydroxyl groups at the ends of the conjugated double bond chains. This structure can have good binding force with inorganic minerals, inorganic color powders and inorganic additives in a polypropylene matrix. When added in small amounts, it has excellent dispersing effect.

In the modified system of the present invention, adding 0.2-2 parts of astaxanthin can help disperse the antibacterial agent, inorganic filler and color powder at the same time, so that a small amount of antibacterial agent can be added and fully dispersed to achieve a stable antibacterial effect, and the color powder has the advantages of stronger coloring power and the like.

On the other hand, the α-hydroxyketone composed of the hydroxyl group and ketone on astaxanthin has an active electronic effect, which can provide free electrons to free radicals or attract unpaired electrons of free radicals, thereby eliminating free radicals in the material and improving the aging resistance of the material. That is, the addition of astaxanthin in this application can comprehensively reduce costs, thereby preparing a low-cost functionalized polypropylene material with excellent comprehensive performance.

Detailed ways

For ease of understanding of the present invention, the present invention will be described more fully below in conjunction with specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

Example 1

According to the weight ratio, 85.6 parts of copolymer polypropylene PP BX3800 (SK Chemical, South Korea), 10 parts of barium sulfate (Shanghai Weiyi Industry), 0.4 parts of antibacterial agent-HX-R102 (Ishizuka Glass), 2 parts of titanium dioxide, 1 part of astaxanthin, 0.2 parts of antioxidant 1010 (BASF), 0.2 parts of antioxidant 168 (BASF), 0.4 parts of light stabilizer UV-531 (Cytec), and 0.2 parts of silicone E525 (Evonik Chemical) were added into a high mixer and dry mixed at 60°C for 6 minutes. The uniform mixture was added into a twin-screw extruder for melt extrusion and granulation. The temperature of the first zone of the twin-screw extruder was 180°C, the second zone was 200°C, the third zone was 210°C, the fourth zone was 220°C; the fifth zone was 220°C, and a modified polypropylene material with excellent surface effect, antibacterial property and weather resistance was obtained.

Example 2

According to the weight ratio, 78.9 parts of copolymerized polypropylene PP EA5075 (Lianlon Basel), 15 parts of calcium carbonate-15T (Omya), 0.5 parts of antibacterial agent-HX-R102 (Ishizuka Glass), 1.5 parts of titanium dioxide, 0.4 parts of carbon black, 0.5 parts of phthalocyanine blue, 0.6 parts of phthalocyanine green, 1.5 parts of astaxanthin, 0.2 parts of antioxidant 1010 (BASF), 0.3 parts of antioxidant 168 (BASF), 0.4 parts of light stabilizer V703 (Cytec Chemical), 0.2 parts of processing aid calcium stearate were added to a high mixer and dry mixed at 50°C for 8 minutes, and then the uniform mixture was added to a twin-screw extruder for melt extrusion and granulation. The temperature of the first zone of the twin-screw extruder was 180°C, the second zone was 200°C, the third zone was 210°C, the fourth zone was 220°C; the fifth zone was 220°C, and a modified polypropylene material with excellent surface effect, antibacterial property and weather resistance was obtained.

Example 3

According to the weight ratio, 83.6 parts of homopolypropylene PP S2040 (Sinopec), 10 parts of talc AH51105 (Liaoning Ai Hai), 0.5 parts of antibacterial agent - HX-R102 (Ishizuka Glass), 2 parts of carbon black, 1 part of titanium dioxide, 1 part of red iron oxide, 0.8 parts of astaxanthin, 0.6 parts of antioxidant (BASF), 0.2 parts of light stabilizer 1010, 0.3 parts of antioxidant 168 (BASF), 0.3 parts of processing aid E525 (Evonik Chemical) were added to a high mixer and dry mixed at 40℃-80℃ for 5-10 minutes, and then the uniform mixture was added to a twin-screw extruder for melt extrusion and granulation. The temperature of the first zone of the twin-screw extruder was 190℃, the second zone was 200℃, the third zone was 210℃, the fourth zone was 210℃; the fifth zone was 220℃, and a modified polypropylene material with excellent surface effect, antibacterial property and weather resistance was obtained.

Example 4

According to the weight ratio, 98.5 parts of copolymer polypropylene PP BX3800 (SK Chemical of South Korea), 0.3 parts of antibacterial agent antibacterial agent-JP-928 (Shanghai Ecolin), 0.5 parts of titanium dioxide, 0.2 parts of astaxanthin, 0.1 parts of light stabilizer 1010, 0.1 parts of antioxidant 1076 (BASF), 0.2 parts of light stabilizer UV-586 (Cytetra), and 0.1 parts of processing aid magnesium stearate are added into a high mixer and dry mixed at 40℃-80℃ for 5-10 minutes. Then, the uniform mixture is added into a twin-screw extruder for melt extrusion and granulation. The temperature of the first zone of the twin-screw extruder is 170℃, the second zone is 180℃, the third zone is 190℃, the fourth zone is 200℃; the fifth zone is 200℃, to obtain a modified polypropylene material with excellent surface effect, antibacterial property and weather resistance.

Example 5

According to the weight ratio, 70.9 parts of copolymerized polypropylene PP K7227H (Wuhan Ethylene), 20 parts of barium sulfate (Shanghai Weiyi Industrial), 0.6 parts of antibacterial agent antibacterial agent-HX-R102 (Ishizuka Glass), 5 parts of titanium dioxide, 2 parts of astaxanthin, 0.6 parts of antioxidant, 0.6 parts of light stabilizer V703 (Cytetra), and 0.3 parts of processing aid E525 (Evonik Chemical) were added into a high mixer and dry-mixed for 5-10 minutes at 40°C-80°C. The uniform mixture was then added into a twin-screw extruder for melt extrusion and granulation. The temperature of the first zone of the twin-screw extruder was 190°C, the second zone was 220°C, the third zone was 230°C, the fourth zone was 230°C; and the fifth zone was 240°C, to obtain a modified polypropylene material with excellent surface effect, antibacterial property and weather resistance.

Comparative Example 1

According to the weight ratio, 86.6 parts of copolymer polypropylene PPBX3800 (SK Chemical, South Korea), 10 parts of barium sulfate (Shanghai Weiyi Industry), 0.4 parts of antibacterial agent-HX-R102 (Ishizuka Glass), 2 parts of titanium dioxide, 0.2 parts of antioxidant 1010 (BASF), 0.2 parts of antioxidant 168 (BASF), 0.4 parts of light stabilizer UV-531 (Cytec), and 0.2 parts of silicone E525 (Evonik Chemical) were added into a high mixer and dry mixed at 60°C for 6 minutes. The uniform mixture was added into a twin-screw extruder for melt extrusion and granulation. The temperature of the first zone of the twin-screw extruder was 180°C, the second zone was 200°C, the third zone was 210°C, the fourth zone was 220°C; the fifth zone was 220°C, and a modified polypropylene material with excellent surface effect, antibacterial property and weather resistance was obtained.

Results test:

1. Surface pitting: The modified polypropylene materials prepared in Examples 1-5 and Comparative Example 1 were used to prepare samples on a high-gloss mold with a size of 5 cm*5 cm, and the surface pitting was visually observed. A pitting with a diameter of 0.05 mm-0.25 mm was counted as one pitting. Five pieces of each sample were grouped together, and the total number of pitting in each group of samples was calculated (if any of the five pieces had a pitting with a diameter greater than 0.25 mm, the pitting effect of the group was directly determined and counted as NG). The details are shown in Table 1 below:

Table 1: Material surface pitting

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Pitting level 3 4 4 5 1 NG

It can be seen from Table 1 that the surface of the modified polypropylene material prepared in the present application is smooth and has fewer pits.

2. Antibacterial test:

The antibacterial properties of the modified polypropylene materials prepared in Examples 1-5 and Comparative Example 1 were tested according to QB/T 2591-2003A "Test Methods and Antibacterial Effects of Antibacterial Plastics". The bacteria used for testing were Escherichia coli ATCC25922 (bacteria A) and Staphylococcus aureus ATCC 6538 (bacteria B). Samples with a size of 50 mm × 50 mm were taken for antibacterial testing, as shown in Table 2 below:

Table 2: Antibacterial properties

In Examples 1-5, the addition of astaxanthin facilitates the dispersion of the antibacterial agent, thereby achieving a stable antibacterial effect by adding a small amount of the antibacterial agent and fully dispersing it.

3. Weather resistance:

Xenon lamp aging is carried out for 2000 hours according to ISO4892-2 standard to test its color difference.

Table 3: Examples 1-5, Comparative Example 1 Xenon lamp aging 2000 hours test results:

In Examples 1-5, astaxanthin is added, which helps to disperse the inorganic filler and the toner, thereby making the toner have advantages such as stronger coloring power. At the same time, the hydroxyl group on astaxanthin and the α-hydroxyketone composed of ketones have an active electronic effect, which can provide free electrons to free radicals or attract unpaired electrons of free radicals, thereby eliminating free radicals in the material and improving the aging resistance of the material.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims (10)

1. A modified polypropylene material, characterized in that it is prepared from the following components in parts by weight: 72.5-98.5 parts of polypropylene, 0-20 parts of inorganic filler, 0.3-0.6 parts of antibacterial agent, 0.5-5 parts of color powder, 0.2-2 parts of astaxanthin, 0.2-0.6 parts of antioxidant, 0.2-0.6 parts of light stabilizer, and 0.1-0.3 parts of processing aid. 2. A modified polypropylene material according to claim 1, characterized in that the polypropylene is at least one of copolymer polypropylene and homopolymer polypropylene. 3. A modified polypropylene material according to claim 1, characterized in that the inorganic filler is at least one of talc, barium sulfate and calcium carbonate. 4. A modified polypropylene material according to claim 1, characterized in that the antibacterial agent is an inorganic antibacterial agent. 5. A modified polypropylene material according to claim 1, characterized in that the toner is inorganic toner or organic toner. 6 . The modified polypropylene material according to claim 1 , wherein the astaxanthin is 3,3′-dihydroxy-4,4′-diketo-β,β′-carotene powder. 7. A modified polypropylene material according to claim 1, characterized in that the antioxidant is a combination of histamine, hindered phenol and phosphite antioxidants. 8. A modified polypropylene material according to claim 1, characterized in that the light stabilizer is a histamine-sensitive light stabilizer. 9. A modified polypropylene material according to claim 1, characterized in that the light stabilizer is a processing aid such as a silicone dispersant or a stearate dispersant. 10. A method for preparing a modified polypropylene material as claimed in any one of claims 1 to 9, characterized in that polypropylene, inorganic filler, antibacterial agent, toner, astaxanthin, antioxidant, light stabilizer and processing aid are added to a high mixer according to weight proportions and dry mixed for 5-10 minutes at 40°C-80°C, and the mixture is added to a twin-screw extruder for melt extrusion and granulation to obtain the modified polypropylene material, wherein the temperature of the twin-screw extruder zone 1 is 170-190°C, the temperature of the second zone is 180-220°C, the temperature of the third zone is 190-230°C, the temperature of the fourth zone is 200-230°C; and the temperature of the fifth zone is 200-240°C.