Novel full-biodegradable material

Abstract

The invention relates to the field of degradable materials, and particularly discloses a novel full-biodegradable material which is prepared by mixing medical stone powder and PBAT (poly (butylene adipate-co-terephthalate)) at high temperature, and the ratio of the content of the medical stone powder to the content of the PBAT is 2: 8. The defect that the existing plastic raw material is not environment-friendly and non-degradable is overcome. The novel full-biodegradable material can be degraded into a material healthy to soil and is environmentally friendly, the production cost is reduced, and a product produced from the material is healthier and high in hardness.

Description

Technical Field

[0001] The invention relates to a degradable material, in particular to a novel fully biodegradable material, belonging to the field of degradable materials. Background Art

[0002] Traditional plastics are difficult to degrade in the natural environment, and long-term accumulation will cause pollution to the soil, water sources and ecosystems. However, degradable plastics can decompose faster under natural conditions, reducing long-term pollution to the environment.

[0003] The widespread use of degradable plastics helps to alleviate the "white pollution" problem, that is, the environmental pollution caused by the difficulty of degrading plastic waste. Therefore, we have developed a new degradable plastic material, which mainly reduces the production cost of manufacturers and the degradable material can also create fertile soil for the soil after degradation. Thus, we have achieved a new ecological and environmentally friendly material. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a new type of fully biodegradable material.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A new type of fully biodegradable material is prepared by mixing medical stone powder and PBAT at high temperature, wherein the ratio of medical stone powder to PBAT is 2:8.

[0007] Optionally, the temperature when the medical stone powder is mixed with PBAT is 170 to 210°C.

[0008] Optionally, the medical stone powder and PBAT are melt-blended using a twin-screw extruder, and during mixing, the interior of the twin-screw extruder is divided into four temperature zones, namely, the first temperature zone, the second temperature zone, the third temperature zone and the fourth temperature zone from the feed end to the discharge end.

[0009] Optionally, the temperature of the first temperature zone is 170 to 180°C, the temperature of the second temperature zone is 180 to 190°C, the temperature of the third temperature zone is 190 to 200°C and the temperature of the fourth temperature zone is 200 to 210°C.

[0010] Optionally, before the melt blending, the medical stone powder and the PBAT particles are mixed at a high speed.

[0011] Optionally, the medical stone powder has a particle size of 1-8 mm and is in granular form.

[0012] Beneficial effects of the present invention:

[0013] The shortcomings of existing plastic raw materials, which are not environmentally friendly and non-degradable, are solved. The new fully biodegradable material can be degraded into a material that is healthy for the soil, is environmentally friendly, reduces production costs, and the products produced with this material are healthier and have high hardness. DETAILED DESCRIPTION

[0014] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0015] A new type of fully biodegradable material, which is prepared by mixing medical stone powder with PBAT at high temperature, wherein the ratio of medical stone powder to PBAT is 2:8. This ratio of PBAT and medical stone powder achieves an ideal balance in terms of material performance. For example, increasing the content of medical stone powder may improve the antibacterial properties of the composite material, but may also reduce its mechanical properties.

[0016] PBAT (polybutylene adipate / terephthalate) is a representative of petrochemical-based biodegradable plastics. It has good ductility and elongation at break and is easy to process into films. Its raw materials are mainly petrochemical raw materials such as PTA (purified terephthalic acid), adipic acid and butanediol, which can be synthesized by direct esterification or transesterification.

[0017] Medical stone powder, medical stone is a natural mineral with a variety of trace elements that are beneficial to the human body. When preparing degradable plastics, medical stone powder can be used as a filler or functional additive to improve certain properties of plastics, such as antibacterial and anti-aging properties.

[0018] As a technical optimization scheme of the present invention, the temperature when the medical stone powder is mixed with PBAT is 170 to 210°C. The melting temperature range of PBAT is usually within a certain range. In order to ensure that PBAT can be fully melted and mixed evenly with the medical stone powder, it is necessary to select a suitable melting and blending temperature. Generally speaking, the melting and blending temperature of PBAT can be set between 170 and 210°C, and the specific temperature should be adjusted according to factors such as the model of PBAT, the amount of medical stone powder added, and the equipment used. It should be noted that too high a temperature may cause the degradation of PBAT, thereby affecting the performance of the final product; while too low a temperature may prevent PBAT from being completely melted, resulting in uneven mixing.

[0019] As a technical optimization scheme of the present invention, the medical stone powder and PBAT are melt-blended using a twin-screw extruder, and are divided into four temperature zones inside the twin-screw extruder during mixing, which are the first temperature zone, the second temperature zone, the third temperature zone and the fourth temperature zone from the feed end to the discharge end. Provide a preliminary heating environment for the raw material to prevent the raw material from softening and sticking prematurely, affecting the smoothness of the feed. The raw material is gradually heated to reduce the stagnation time in the melting zone to prepare for the subsequent melting process. The raw material is thoroughly melted, and the gas in the raw material can be fully discharged. If the temperature is too high, the raw material will be decomposed, thereby affecting the quality of the product. The molten raw material is mixed to ensure the uniformity of the raw material performance.

[0020] As a technical optimization solution of the present invention, the temperature of the first temperature zone is 170 to 180° C., the second temperature zone is 180 to 190° C., the third temperature zone is 190 to 200° C. and the fourth temperature zone is 200 to 210° C. The material temperature rises slowly to ensure stable extrusion and molding of the material.

[0021] As a technical optimization solution of the present invention, before the melt blending, the medical stone powder and the PBAT particles are mixed at a high speed to make the subsequent melt blending more uniform.

[0022] As a technical optimization scheme of the present invention, the particle size of the medical stone powder is 1-8mm, and is granular. Medical stone powder needs to be processed for particle size before use to ensure that it is evenly dispersed in the PBAT matrix. The particle size specification of medical stone powder can be selected according to actual needs. Common medical stone powder particle size specifications have 1-2mm, 3-5mm, 5-8mm granular, and 100 mesh, 200 mesh, 325 mesh, 400 mesh, 600 mesh or even finer powder. When medical stone powder is added to PBAT as a filler, in order to obtain better dispersibility and uniformity, finer powdered medical stone powder is usually selected. Specifically, if it is hoped that medical stone powder can be more evenly dispersed in the PBAT matrix, medical stone powder with a smaller particle size can be selected, such as 200 mesh or 325 mesh. These finer medical stone powder particles are more easily wrapped and dispersed by the PBAT matrix during melt blending, thereby helping to improve the mechanical properties and degradation properties of the composite material.

[0023] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A new type of fully biodegradable material, characterized in that: The degradable material is prepared by mixing medical stone powder and PBAT at high temperature, wherein the ratio of medical stone powder to PBAT is 2:

8.

2. A novel fully biodegradable material according to claim 1, characterized in that: The temperature when the medical stone powder and PBAT are mixed is 170 to 210°C.

3. A novel fully biodegradable material according to claim 2, characterized in that: The medical stone powder and PBAT are melt-blended by a twin-screw extruder, and during mixing, the inside of the twin-screw extruder is divided into four temperature zones, which are the first temperature zone, the second temperature zone, the third temperature zone and the fourth temperature zone from the feed end to the discharge end.

4. A novel fully biodegradable material according to claim 3, characterized in that: The temperature of the first temperature zone is 170 to 180°C, the temperature of the second temperature zone is 180 to 190°C, the temperature of the third temperature zone is 190 to 200°C and the temperature of the fourth temperature zone is 200 to 210°C.

5. A novel fully biodegradable material according to claim 4, characterized in that: Before the melt blending, the medical stone powder and the PBAT particles are mixed at a high speed.

6. A novel fully biodegradable material according to claim 5, characterized in that: The medical stone powder has a particle size of 1-8 mm and is in granular form.