High-toughness plastic bag processing technology

Abstract

The invention relates to the technical field of plastic bags, in particular to a processing technology of a high-toughness plastic bag, in order to improve the toughness, degradability and environmental protection of the plastic bag, the high-toughness plastic bag comprises the following main raw materials: polylactic acid particles, acetyl tributyl citrate, glucomannan, polyvinylpyrrolidone, bamboo fibers, an organosilane coupling agent and a tert-butylhydroquinone antioxidant. After polylactic acid particles are screened, bamboo fibers are cooked, the polylactic acid particles, acetyl tributyl citrate, glucomannan, polyvinylpyrrolidone, a coupling agent and an antioxidant are added into a reaction kettle according to the proportion and evenly stirred, polylactic acid enters a molten state, blow molding is conducted through a blow molding machine, the bamboo fibers are placed in a plastic bag structure, and the plastic bag structure is formed. According to the plastic bag manufactured through the technology, the plastic bag body is provided with the rope penetrating hole, the contraction rope is installed, inner objects can be prevented from shaking, and the plastic bag manufactured through the technology is convenient to use, relatively higher in toughness and strength, degradable and more environmentally friendly.

Description

Technical Field

[0001] The invention relates to the technical field of plastic bags, in particular to a high-toughness plastic bag processing technology. Background Art

[0002] Plastic bags are almost indispensable in people's daily lives. When people shop in supermarkets and buy vegetables in vegetable markets, they need to use plastic bags to pack food.

[0003] Existing plastic bags have poor toughness and are easily damaged during use. Therefore, in order to improve the quality of plastic bags, chemical toughening agents are added to the plastic bags to increase their toughness. Excessive chemical toughening agents are difficult to degrade, and the discarded plastic bags are likely to affect the environment.

[0004] Therefore, it is necessary to design a plastic bag that is environmentally friendly and has sufficient toughness. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a high-toughness plastic bag processing technology, which is not only tough, but also makes the plastic bag not easily damaged, and the plastic bag can be naturally degraded after being discarded, which is more environmentally friendly.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A high-toughness plastic bag processing technology specifically includes the following steps: Step S1, raw material proportioning and preparation, the raw materials include: polylactic acid particles, plasticizer, degradable reinforcing material, toughening agent, toughening fiber, coupling agent and antioxidant; Step S2, crushing the polylactic acid particles and screening the crushed polylactic acid particles; Step S3, steam-treating the toughened fibers; Step S4, adding polylactic acid particles, tributyl acetyl citrate, a degradable reinforcing material, a toughening agent, a coupling agent and an antioxidant into a reaction kettle according to a proportion, and uniformly stirring to obtain a melt; Step S5, blowing the melt into a plastic bag through a blow molding machine, and placing the bamboo fiber in the plastic bag structure; Step S6, a hole for threading a rope is opened on the plastic bag body, and the shrink rope is installed to complete the processing flow.

[0007] Optionally, in one embodiment of the present invention, the toughening fiber is any one of bamboo fiber, hemp fiber or cotton fiber, which is used to improve the toughness and durability of the plastic bag.

[0008] Optionally, in one embodiment of the present invention, the degradable reinforcing material is any one of glucomannan or chitosan.

[0009] Optionally, in one embodiment of the present invention, the toughening agent is polyvinyl pyrrolidone.

[0010] Optionally, in one embodiment of the present invention, the coupling agent is any one of an organic silane coupling agent, a titanate coupling agent, and an aluminate coupling agent.

[0011] Optionally, in one embodiment of the present invention, the antioxidant is tert-butylhydroquinone antioxidant.

[0012] Optionally, in one embodiment of the present invention, the raw material ratio of step S1 is specifically: 6-8 parts of polylactic acid particles, 0.5-1 part of acetyl tributyl citrate, 0.5-1 part of degradable reinforcing material, 2-3 parts of toughening agent, 1-2 parts of toughening fiber, 1-2 parts of coupling agent and 1-2 parts of antioxidant.

[0013] Optionally, in one embodiment of the present invention, the screening in step S2 specifically includes: screening the polylactic acid particles according to 100-150 mesh.

[0014] Beneficial effects of the present invention The high-toughness plastic bag processing technology of the present invention adopts degradable materials as raw materials. The plastic bags can be naturally degraded after being discarded, and have little pollution to the environment. During the processing, reinforcing fibers are added to the plastic bags to further enhance the toughness of the plastic bags. The molded plastic bags are provided with shrinkage ropes to stabilize the items inside, such as soup, to prevent the liquid items inside from shaking and spilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Figure 1 , a process flow chart of Example 1 of the present invention; DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0017] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments. Example 1

[0018] In order to make the use of plastic bags more environmentally friendly and resistant to high temperatures, a high-toughness plastic bag processing technology has been developed. The specific plan is as follows: A high-toughness plastic bag processing technology specifically includes the following steps: Step S1, raw material proportioning and preparation, the raw materials include: polylactic acid particles, plasticizer, degradable reinforcing material, toughening agent, toughening fiber, coupling agent and antioxidant; Polylactic acid particles have good biodegradability and recyclability, and can be degraded into harmless substances under natural conditions, thereby reducing pollution to the environment.

[0019] In this embodiment, the plasticizer is tributyl acetyl citrate, which has the advantages of extremely low toxicity, good compatibility, good weather resistance, long service life, etc. In the manufacture of plastic bags, it can increase the flexibility and durability of plastic bags.

[0020] In other embodiments, acetyl tributyl citrate can be replaced by epoxidized soybean oil or bio-based plasticizers, further improving the environmental protection characteristics of the raw materials.

[0021] The toughening fiber is any one of bamboo fiber, hemp fiber or cotton fiber, which is used to improve the toughness and durability of the plastic bag. In other schemes, the toughening fiber is hemp fiber or cotton fiber, which can be cut and combed, and then evenly mixed with the melt for use.

[0022] In this embodiment, the toughening fiber is bamboo fiber, which is renewable and can be added to the plastic bag to enhance its environmental performance and biodegradability. The bamboo fiber needs to be processed before use, specifically: the bamboo fiber is further steamed at a temperature of 80-85 degrees for 30 minutes. After steaming, the excess juice is taken out and dried, and then a flattening operation is performed to make the bamboo fiber finally maintain a U-shaped structure to increase its toughness and bonding strength in the plastic bag.

[0023] The degradable reinforcing material is any one of glucomannan and chitosan.

[0024] In this embodiment, the degradable reinforcing material is glucomannan, which has the characteristics of being water-soluble, film-forming, and having good toughness. During the processing of plastic bags, it can be used as a base material for degradable materials to improve the biodegradability and mechanical strength of the plastic bags.

[0025] The toughening agent is polyvinyl pyrrolidone.

[0026] The coupling agent is any one of an organic silane coupling agent, a titanate coupling agent, and an aluminate coupling agent.

[0027] In this embodiment, the coupling agent is an organic silane coupling agent. The antioxidant is tert-butylhydroquinone antioxidant.

[0028] The specific raw material ratio of step S1 is: 6-8 parts of polylactic acid particles, 0.5-1 parts of acetyl tributyl citrate, 0.5-1 parts of degradable reinforcing material, 2-3 parts of toughening agent, 1-2 parts of toughening fiber, 1-2 parts of coupling agent and 1-2 parts of antioxidant.

[0029] Step S2, crushing the polylactic acid particles and screening the crushed polylactic acid particles; Step S3, steam-treating the toughened fibers; The screening step S2 specifically includes screening the polylactic acid particles according to 100-150 mesh.

[0030] Step S4, adding polylactic acid particles, tributyl acetyl citrate, a degradable reinforcing material, a toughening agent, a coupling agent and an antioxidant into a reaction kettle according to a proportion, stirring evenly, and rapidly heating the temperature to 170-180 degrees to melt the polylactic acid to obtain a melt; Step S5, blow-molding the melt into a plastic bag through a blow molding machine. During the blow molding, the blow molding model is designed as a plastic bag structure with a hollow space around the periphery, so as to place the bamboo fiber in the plastic bag structure; Step S6, a hole for threading a rope is opened on the plastic bag body, and the shrink rope is installed to complete the processing flow.

[0031] After the shrink rope is installed, the plastic bag needs to be cooled and qualitatively treated to ensure the stability of shape and size, as well as necessary cleaning and deburring operations.

[0032] The plastic bag processing technology of this scheme uses degradable materials as the main raw materials of plastic bags. The plastic bags can be naturally degraded after being discarded, and have little pollution to the environment. During the processing, bamboo fiber is also added to the plastic bags to further enhance the toughness of the plastic bags, and the molded plastic bags are provided with shrink ropes to stabilize the items inside. Example 2

[0033] In this embodiment, the composition of the plastic bag is basically the same as that of the plastic bag in Example 1. The difference is that a certain proportion of recycled polylactic acid particles are also mixed into the raw materials to reduce the production of new plastics, reduce production costs and reduce waste of resources. Example 3

[0034] In this embodiment, the composition of the plastic bag is basically the same as that of the plastic bag in Example 1, except that acetyl tributyl citrate is replaced by a bio-based plasticizer to further reduce the impact of the plastic bag on the environment after it is discarded, and nanomaterials such as nanocellulose and nanoclay are added to the raw materials to further improve the mechanical properties of the plastic bag and reduce the amount of material used, thereby reducing resource consumption and waste generation. Natural mineral fillers such as talcum powder and calcium carbonate can also be added to reduce costs and improve the rigidity and heat resistance of the plastic bag. At the same time, the filler is renewable and harmless to the environment.

[0035] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above in the form of preferred embodiments, it is not intended to limit the present invention. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-toughness plastic bag processing technology, characterized in that: The specific steps include: Step S1, raw material proportioning and preparation, the raw materials include: polylactic acid particles, plasticizer, degradable reinforcing material, toughening agent, toughening fiber, coupling agent and antioxidant; Step S2, crushing the polylactic acid particles and screening the crushed polylactic acid particles; Step S3, steam-treating the toughened fibers; Step S4, adding polylactic acid particles, tributyl acetyl citrate, a degradable reinforcing material, a toughening agent, a coupling agent and an antioxidant into a reaction kettle according to a proportion, and uniformly stirring to obtain a melt; Step S5, blowing the melt into a plastic bag through a blow molding machine, and placing the bamboo fiber in the plastic bag structure; Step S6, a hole for threading a rope is opened on the plastic bag body, and the shrink rope is installed to complete the processing flow.

2. A high-toughness plastic bag processing technology according to claim 1, characterized in that: The toughening fiber is any one of bamboo fiber, hemp fiber or cotton fiber, and is used to improve the toughness and durability of the plastic bag.

3. A high-toughness plastic bag processing technology according to claim 1, characterized in that: The degradable reinforcing material is any one of glucomannan and chitosan.

4. A high-toughness plastic bag processing technology according to claim 1, characterized in that: The toughening agent is polyvinyl pyrrolidone.

5. The high-toughness plastic bag processing technology according to claim 1 is characterized by: The coupling agent is any one of an organic silane coupling agent, a titanate coupling agent, and an aluminate coupling agent.

6. A high-toughness plastic bag processing technology according to claim 1, characterized in that: The antioxidant is tert-butylhydroquinone antioxidant.

7. A high-toughness plastic bag processing technology according to claim 1, characterized in that: The raw material ratio of step S1 is specifically: 6-8 parts of polylactic acid particles, 0.5-1 parts of acetyl tributyl citrate, 0.5-1 parts of degradable reinforcing material, 2-3 parts of toughening agent, 1-2 parts of toughening fiber, 1-2 parts of coupling agent and 1-2 parts of antioxidant.

8. The high-toughness plastic bag processing technology according to claim 1 is characterized by: The screening step S2 specifically includes screening the polylactic acid particles according to 100-150 mesh.

Images