Bamboo powder modified PBS biodegradable straw material

Abstract

The invention relates to the technical field of high polymer materials, and particularly discloses a bamboo powder modified PBS biodegradable straw material. According to the bamboo powder modified PBS biodegradable straw material provided by the invention, PBS and PLA are used as main raw materials, bamboo powder is used as a modifier, and the bamboo powder modified PBS biodegradable straw material is obtained by extruding and granulating through a double-screw extruder. The prepared modified material for the straw is excellent in performance, low in price, green and completely biodegradable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to a bamboo powder modified PBS biodegradable straw material. BACKGROUND

[0002] Most of the existing plastic products are non-degradable petroleum-based synthetic polymers, and people often discard plastic products randomly during the use of plastics, which has a serious impact on the earth's ecological system. Non-degradable plastics can be decomposed into various microplastics in the natural environment, which not only affects the natural environment, but also is transmitted through the food chain and eventually enters the human body to harm human health. In order to reduce the impact of non-degradable plastics on the human body and the natural environment, China requires that the national catering industry prohibit the use of non-degradable disposable plastic straws. Therefore, it is urgent to provide a biodegradable straw material.

[0003] PBS (polybutylene succinate) has good processing performance, high heat distortion temperature, and can be processed by extrusion molding, injection molding and thermoforming. PBS can be completely degraded into carbon dioxide and water under suitable conditions, and is one of the most active and best degradable materials in biodegradable plastic research. However, PBS has low elongation at break, poor mechanical properties and thermal stability, and high production cost, which limits its wide application in commerce.

[0004] The present application aims to modify PBS in order to provide a biodegradable material for straw production. SUMMARY

[0005] The technical problem solved by the present application is to provide a bamboo powder modified PBS biodegradable straw material. The present application also provides a preparation method and application of the bamboo powder modified PBS biodegradable straw material.

[0006] To solve the above technical problems, the technical solution adopted by the present application is: a bamboo powder modified PBS biodegradable straw material, which comprises the following raw materials by weight: PBS 40-60 parts PLA 20-40 parts Bamboo powder 10-25 parts Antioxidant 0.1-0.4 parts Hydrolysis-resistant agent 0.1-0.4 parts Lubricant 0.2-0.3 parts Plasticizer 0.2-0.3 parts Coupling agent 0.3-0.6 parts.

[0007] Preferably, the bamboo powder modified PBS biodegradable straw material comprises the following raw materials by weight: PBS 50-55 parts PLA 28-33 parts Bamboo powder 15-20 parts Antioxidant 0.1-0.3 parts Anti-hydrolysis agent 0.1-0.3 parts Lubricant 0.2-0.3 parts Plasticizer 0.2-0.3 parts Coupling agent 0.4-0.6 parts.

[0008] Further preferably, the bamboo powder modified PBS biodegradable straw material comprises the following raw materials by weight: PBS 50-55 parts PLA 30 parts Bamboo powder 15-20 parts Antioxidant 0.2 parts Anti-hydrolysis agent 0.2 parts Lubricant 0.25 parts Plasticizer 0.25 parts Coupling agent 0.5 parts.

[0009] As an embodiment of the present application, the bamboo powder is 2000 mesh bamboo powder.

[0010] As an embodiment of the present application, the antioxidant is antioxidant 1010.

[0011] As an embodiment of the present application, the lubricant is ethylene bis-stearamide.

[0012] As an embodiment of the present application, the plasticizer is acetyl tributyl citrate.

[0013] As an embodiment of the present application, the coupling agent is selected from one or more of aluminate coupling agent, KH570, KH560.

[0014] As an embodiment of the present application, the anti-hydrolysis agent is Shanghai Langyi HyMax @210.

[0015] The present application also provides a preparation method of the bamboo powder modified PBS biodegradable straw material, comprising the steps of: (1) mixing PBS, PLA, bamboo powder, antioxidant, anti-hydrolysis agent, lubricant, plasticizer, coupling agent uniformly to obtain a mixture; (2) feeding the mixture into a twin-screw extruder for extrusion granulation to obtain the bamboo powder modified PBS biodegradable straw material; The temperature of the double-screw extruder is 140-185 DEG C, the rotating speed is 160-180 rpm, and the feeding rotating speed is 5-7 Hz.

[0016] The material mixing of step (1) is carried out in a high-speed mixer, the high-speed mixer mixes the material at a speed of 550-650 rpm, the mixing time is 1-5 min, and a uniformly mixed material is obtained.

[0017] The application also provides the application of the bamboo powder modified PBS biodegradable straw material.

[0018] The bamboo powder modified PBS biodegradable straw material is prepared by taking PBS and PLA (polylactic acid) as main raw materials, using bamboo powder as a modifier, and extruding and granulating through a double-screw extruder.

[0019] The bamboo powder used in the application is prepared from bamboo, the bamboo is widely sourced and grows rapidly. The bamboo powder is mainly composed of cellulose, hemicellulose and lignin. The bamboo powder has good mechanical properties, high strength, good elasticity and small density, and excellent bending performance. The use of bamboo powder to modify PBS can obtain completely biodegradable plastics and reduce the production cost of the modified material. Meanwhile, the bamboo powder has rich reaction functional groups, which also provides the possibility of enriching the functions of PBS-based biodegradable plastics. The application realizes the high-value utilization of bamboo powder.

[0020] The application also adds antioxidants, hydrolysis-resistant agents, lubricants, plasticizers and coupling agents in the preparation of raw materials. Through the selection of these raw materials, the comprehensive performance of the prepared straw modified material is increased, the cost of the modified material is reduced, and the straw modified material with excellent performance, low price and green complete biodegradability is obtained.

[0021] The application uses 2000 mesh bamboo powder modified PBS produced in industrial production, uses a coupling agent to reduce the surface polarity of the bamboo powder and increase the compatibility of the bamboo powder with PBS and polylactic acid, and uses the high strength and rich properties of the bamboo powder itself to obtain PBS modified material with good performance at a high filling amount and reduce the cost of the modified material. The water absorption and high polarity of the bamboo powder itself make it have poor compatibility with hydrophobic PBS and polylactic acid. Therefore, the application adds a coupling agent such as an aluminate coupling agent, KH570 and KH560, uses the aluminate coupling agent and / or silane coupling agent to react with the hydroxyl group on the surface of the bamboo powder, reduces the surface polarity of the bamboo powder, and thus enhances the compatibility of the bamboo powder with PBS and polylactic acid. Through experiments, it is found that, especially when the coupling agent KH570 is used, the bamboo powder modified PBS biodegradable straw material has more excellent comprehensive performance, good mechanical properties and heat resistance. DETAILED DESCRIPTION

[0022] The technical solutions of the present application are described in detail below through specific examples. The following examples are intended to further illustrate the content of the present application, rather than limit the scope of protection of the claims of the present application.

[0023] In the following examples: The PBS raw material used is from Kanghui New Material Technology Co., Ltd.; The PLA raw material used is L130 Kobo, purchased from Thailand's Dow; The bamboo powder used is an industrial 2000 mesh bamboo powder, which is dried in an 80°C oven for 4h before use; The antioxidant used is BASF antioxidant 1010; The anti-hydrolysis agent used is Shanghai Langyi HyMax @210; The lubricant used is ethylene bis-stearamide; The plasticizer used is acetyl tributyl citrate; The coupling agent used is selected from aluminate coupling agent, KH570, KH560.

[0024] In the following examples, the reagents used are commercially available unless otherwise specified.

[0025] In the following examples, the experimental methods used are conventional unless otherwise specified.

[0026] Example 1 The present embodiment provides a bamboo powder modified PBS biodegradable straw material, and the weight parts of the preparation raw materials are as follows: PBS 55 parts PLA 30 parts Bamboo powder 15 parts Antioxidant 0.2 parts Anti-hydrolysis agent 0.2 parts Lubricant 0.25 parts Plasticizer 0.25 parts Coupling agent 0.5 parts.

[0027] Among them, the coupling agent used is aluminate coupling agent.

[0028] The preparation method of the bamboo powder modified PBS biodegradable straw material provided in the present embodiment includes the following steps: Put the above raw materials into a high-speed mixer, mix at a speed of 600 rpm, and mix for 3 min to obtain a uniformly mixed mixture; The mixture is then sent to the main feeding port of the double screw extruder, and the heating temperatures of each zone of the double screw extruder are 140°C, 170°C, 180°C, 185°C, 185°C, 185°C, 185°C, 185°C, 180°C, 175°C, 170°C, 170°C, respectively, the screw rotation speed is 170 rpm, the feeding speed is 6 Hz, and the screw extruded material is cut into particles by using a granulator after air cooling to obtain the bamboo powder modified PBS biodegradable straw material. The material is sealed and stored for use.

[0029] Example 2 The bamboo powder modified PBS biodegradable straw material provided in this embodiment is prepared from the following raw materials by weight: PBS 50 parts PLA 30 parts Bamboo powder 20 parts Antioxidant 0.2 parts Anti-hydrolysis agent 0.2 parts Lubricant 0.25 parts Plasticizer 0.25 parts Coupling agent 0.5 parts.

[0030] The coupling agent used is aluminate coupling agent.

[0031] The preparation method of the bamboo powder modified PBS biodegradable straw material provided in this embodiment is referred to Example 1.

[0032] Example 3 The bamboo powder modified PBS biodegradable straw material provided in this embodiment is prepared from the following raw materials by weight: PBS 50 parts PLA 30 parts Bamboo powder 20 parts Antioxidant 0.2 parts Anti-hydrolysis agent 0.2 parts Lubricant 0.25 parts Plasticizer 0.25 parts Coupling agent 0.5 parts.

[0033] The coupling agent used is KH570.

[0034] The preparation method of the bamboo powder modified PBS biodegradable straw material provided in this embodiment is referred to Example 1.

[0035] Example 4 The bamboo powder modified PBS biodegradable straw material provided in this embodiment is prepared from the following raw materials by weight: PBS 50 parts PLA 30 parts Bamboo powder 20 parts Antioxidant 0.2 parts Anti-hydrolysis agent 0.2 parts Lubricant 0.25 parts Plasticizer 0.25 parts Coupling agent 0.5 parts.

[0036] Among them, the coupling agent used is KH560.

[0037] The preparation method of the bamboo powder modified PBS biodegradable straw material provided in the embodiment refers to embodiment 1.

[0038] Performance test Take the bamboo powder modified PBS biodegradable straw material prepared in the above embodiments 1-4, and use an injection molding machine to obtain a standard sample, and measure the mechanical properties (tensile strength, elongation at break, bending strength, and heat distortion temperature) of the material.

[0039] The test method of the related performance indicators is as follows: Melt index: tested by GB / T 3682 test method; Tensile strength: tested by GB / T 1040.3-2006 test method; Elongation at break: tested by GB / T 528-2009 test method; Bending strength: tested by GB / T 9341 test method; Heat distortion temperature: tested by GB / T 1634 test method.

[0040] Table 1 below is the test results of each embodiment.

[0041] Table 1 As can be seen from the above table 1, the bamboo powder modified PBS biodegradable straw material provided in embodiments 1-4 has excellent comprehensive performance, good mechanical properties, and good heat resistance.

[0042] As can be seen from the results of embodiments 1 and 2, when the filling amount of bamboo powder is increased, the performance of the obtained straw material is improved, and the production cost of the straw material is further reduced.

[0043] As can be seen from the results of embodiments 2-4, different coupling agents have a significant effect on the performance of the obtained straw material. For example, when the coupling agent KH570 is used, i.e. in embodiment 3, the obtained straw material has excellent comprehensive performance, good mechanical properties, and good heat resistance.

[0044] The bamboo powder modified PBS biodegradable straw material prepared in the above Examples 1-4 was prepared into a straw by an extruder pipe drawing process, and the aging and strength of the straw were measured.

[0045] The aging test was to age for 72h in a constant temperature and humidity box (85% relative humidity in the box, temperature ℃), and to see if it became brittle. It was found by testing that the straws made of the bamboo powder modified PBS biodegradable straw material prepared in the above Examples 1-4 were not brittle.

[0046] The strength test was to test whether the prepared straw could pierce the plastic film, and it was found by testing that the straws made of the bamboo powder modified PBS biodegradable straw material prepared in the above Examples 1-4 could easily pierce the plastic film.

[0047] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent transformation or direct or indirect application in other related technical fields using the content of the present application is included in the patent protection scope of the present application.

Claims

1. A bamboo powder-modified PBS biodegradable straw material, characterized in that: The material includes the following preparation raw materials in parts by weight: 40-60 parts PBS PLA 20-40 parts 10-25 parts bamboo powder 0.1-0.4 parts antioxidant 0.1-0.4 parts of anti-hydrolysis agent 0.2-0.3 parts of lubricant Plasticizer 0.2-0.3 parts 0.3-0.6 parts of coupling agent.

2. The material according to claim 1, wherein The material includes the following preparation raw materials in parts by weight: 50-55 parts PBS 28-33 parts of PLA 15-20 parts bamboo powder 0.1-0.3 parts of antioxidant 0.1-0.3 parts of anti-hydrolysis agent 0.2-0.3 parts of lubricant Plasticizer 0.2-0.3 parts 0.4-0.6 parts of coupling agent.

3. The material according to claim 1, wherein The material includes the following preparation raw materials in parts by weight: 50-55 parts PBS PLA 30 parts 15-20 parts bamboo powder 0.2 parts antioxidant 0.2 parts of anti-hydrolysis agent 0.25 parts of lubricant 0.25 parts of plasticizer 0.5 parts of coupling agent.

4. The material according to any one of claims 1 to 3, characterized in that The bamboo powder is 2000 mesh bamboo powder.

5. The material according to any one of claims 1 to 3, characterized in that The antioxidant is antioxidant 1010.

6. The material according to any one of claims 1 to 3, characterized in that The lubricant is ethylene bisstearamide.

7. The material according to any one of claims 1 to 3, characterized in that The plasticizer is acetyl tributyl citrate.

8. The material according to any one of claims 1 to 3, characterized in that The coupling agent is selected from one or more of aluminate coupling agent, KH570, and KH560.

9. A method for preparing the bamboo powder modified PBS biodegradable straw material according to any one of claims 1 to 8, characterized in that: Including steps: (1) PBS, PLA, bamboo powder, antioxidant, anti-hydrolysis agent, lubricant, plasticizer, and coupling agent are mixed uniformly to obtain a mixture; (2) sending the mixed material to a twin-screw extruder for extrusion and granulation to obtain the bamboo powder-modified PBS biodegradable straw material; The temperature of the twin-screw extruder is 140-185° C., the rotation speed is 160-180 rpm, and the feeding speed is 5-7 Hz.

10. Use of the bamboo powder-modified PBS biodegradable straw material according to any one of claims 1 to 8 in straw production.

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