A fully biodegradable glove bag
By modifying the porous composite material of polystyrene and sugar cane bag, combined with SBS and other materials, the problem of slow degradation of non-degradable plastic glove packaging bags is solved, and a degradable glove bag with good mechanical properties is achieved, reducing environmental pollution .
Patent Information
- Application Number
- CN202411257395.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2044-09-09
AI Technical Summary
The existing non-degradable petroleum-based plastic glove packaging bags have slow degradation in the natural environment, resulting in severe white pollution and are difficult to effectively deal with.
Using a fully biodegradable glove bag, the modified polystyrene powder and sugarcane bagasse are combined to form a porous structure, and the fluoroacetylated modified polystyrene and sugarcane are treated with 2-fluoroacetyl chloride and sodium hydroxide to form fluoroacetylated modified polystyrene and sugarcane. The composite material of slag promotes microbial degradation, and at the same time, SBS, polypropylene and other materials are added during the melt extrusion process to improve strength and elasticity.
Degradable plastic glove bags are achieved, while maintaining good mechanical properties, which can quickly degrade under the action of microorganisms and reduce environmental pollution.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of degradable plastics, in particular to a fully biodegradable glove bag. Background Art
[0002] At present, most of the glove packaging materials are non-degradable petroleum-based plastics. Such plastic packaging bags are widely used in many fields of daily life due to their advantages of high strength, low price, light weight, convenient transportation, and effective product protection. While bringing convenience to people, they also bring huge burdens to the natural environment. These petroleum-based plastic packaging bags degrade very slowly under natural environment and microbial conditions, causing serious white pollution. Nearly 30% of the waste plastic glove bags used each year are difficult to be effectively treated and can only be treated by landfill, incineration, composting, etc. Therefore, it is a general trend in the plastic packaging bag industry to use natural or synthetic degradable plastics to replace non-degradable petroleum-based plastics. Summary of the invention
[0003] The object of the present invention is to provide a fully biodegradable glove bag to solve the problems existing in the prior art.
[0004] In order to solve the above technical problems, the present invention provides the following technical solution: a fully biodegradable glove bag, comprising the following preparation steps:
[0005] (1) Under a nitrogen atmosphere, 0.5-1.2 parts by weight of polystyrene powder with a molecular weight range of 5000-50000 and 19-30 parts by weight of dichloromethane are stirred at 30 rpm for 12 hours, 0.4-1.5 parts by weight of 2-fluoroacetyl chloride and 0.08 parts by weight of aluminum chloride are added, and the reaction is carried out at 25°C for 3-5 hours to obtain a reaction solution, and the reaction solution is first treated with tetrahydrofuran and a 3.8% by volume hydrochloric acid solution to fully wash away the aluminum chloride attached to the surface of the polystyrene powder, and then the pH of the reaction solution is adjusted to 6 with deionized water, and then the pH of the reaction solution is adjusted with anhydrous ethanol, and the filtrate is filtered and dried at 60°C to constant weight to obtain a modified polystyrene powder;
[0006] (2) dissolving the modified polystyrene powder in toluene to obtain a polystyrene solution;
[0007] (3) Mix bagasse and 3 wt% sodium hydroxide solution in a mass ratio of 1:108-110, place in a 0-4°C refrigerator for treatment for 12-18 hours, pour in a polystyrene solution, the mass ratio of the polystyrene solution to the sodium hydroxide solution is 1:10-25, pour into an ultra-low temperature stirring tank, adjust the temperature in the ultra-low temperature stirring tank to -18°C, and the stirring speed is 100 rpm. After treating for 1-2 hours, filter out the solid, place in a freeze dryer, and freeze-dry at -18°C to constant weight to obtain a degradation agent;
[0008] (4) The biodegradable agent, SBS, polypropylene, glass fiber, silane coupling agent, defoaming agent and plasticizer are uniformly mixed in a mass ratio of 10-15:8-15:35-60:1-5:0.5-2:0.5-1:3-5, melt-extruded at 190-210°C, blown film, slit, rolled and bagged to obtain a fully biodegradable glove bag.
[0009] Furthermore, the concentration of the polystyrene solution in step (2) is 10-45 mg / mL.
[0010] Furthermore, the polypropylene melt index in step (4) is 3.6 g·(10 min) -1 .
[0011] Furthermore, the silane coupling agent in step (4) is one of KH550, KH560, and KH570.
[0012] Furthermore, the plasticizer in step (4) is glycerol.
[0013] Furthermore, the defoaming agent in step (4) is silicone oil.
[0014] Furthermore, the SBS in step (4) is SBS 1401.
[0015] Furthermore, the polypropylene in step (4) is polypropylene PP s1003.
[0016] Compared with the prior art, the beneficial effects achieved by the present invention are:
[0017] The present invention adopts 2-fluoroacetyl chloride to modify polystyrene to obtain fluoroacetylated modified polystyrene powder, which is then placed in a toluene environment, and the modified polystyrene powder is dissolved to form a polystyrene solution; then the present invention selects bagasse as a natural degradation agent, and after cold treatment with sodium hydroxide, the complete and compact surface structure of the bagasse is significantly damaged and becomes loose, and more active sites such as OH are exposed at the same time, and then the polystyrene solution is poured into the cold treatment liquid of the bagasse, the solvent environment changes, and the ambient temperature drops rapidly, the original toluene cannot maintain the dissolved state of the polymer, resulting in rapid precipitation in a solid state, and the inside and outside of the solid state are heated to different degrees, and then the relative cooling speed is different, so that the inside and outside shrink unevenly, forming a large internal stress, causing cracks, and making the modified Open channels are formed on the inner and outer surfaces of polystyrene, presenting a porous structure. At the same time, the modified polystyrene molecular structure contains fluorine atoms, which can form certain hydrogen bonds with the -OH of sugarcane bagasse, and then adhere to the surface of sugarcane. Due to the loose structure of sugarcane bagasse, part of the modified polystyrene enters the internal structure, which better wraps the sugarcane bagasse. The channels of the modified polystyrene are connected to the outside world, and microorganisms can contact the degradation agent through the micropores of the modified polystyrene, which can block the degradation agent from directly contacting the external environment. While achieving degradability, it can also meet daily use, and control the ratio of modified polystyrene to sugarcane bagasse to prevent excessive modified polystyrene coating from reducing the degradation rate, and too little modified polystyrene coating from affecting the mechanical properties of the glove bag.
[0018] During the melt extrusion process of glove bags, SBS is used to promote the interface compatibility between polypropylene and polystyrene, thereby reducing the deformation and sticking of polystyrene during the hot melt processing, thereby affecting the degradation effect. In addition, the better compatibility of the interface can improve the strength and elasticity of the glove bags. DETAILED DESCRIPTION
[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0020] In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe in detail the various index testing methods of the fully biodegradable glove bags prepared in the following examples are as follows:
[0021] Mechanical properties: The tensile strength and elongation at break of the fully biodegradable glove bags were tested according to GB / T1040.3-2006 Determination of tensile properties of plastics Part 3: Test conditions for films and sheets.
[0022] Degradability: Refer to "GB / T20197-2006 Degradable Plastic Testing Standard" to test the degradation rate of glove bags.
[0023] Example 1; (1) Under a nitrogen atmosphere, 0.5 parts by weight of polystyrene powder and 25 parts by weight of dichloromethane were stirred at 30 rpm for 12 h, 0.4 parts by weight of 2-fluoroacetyl chloride and 0.08 parts by weight of aluminum chloride were added, and the mixture was reacted at 25° C. for 3 h to obtain a reaction solution, the reaction solution was first treated with tetrahydrofuran and a 3.8% by volume hydrochloric acid solution to fully wash away the aluminum chloride attached to the surface of the polystyrene powder, the pH of the reaction solution was adjusted to 6 with deionized water, and the pH of the reaction solution was adjusted with anhydrous ethanol, the filtrate was filtered, and the filtrate was dried at 60° C. to constant weight to obtain a modified polystyrene powder;
[0024] (2) dissolving the modified polystyrene powder in toluene at a concentration of 20 mg / mL to obtain a polystyrene solution;
[0025] (3) Mix bagasse and 3 wt% sodium hydroxide solution in a mass ratio of 1:110 and place in a 1°C refrigerator for treatment for 16 hours, pour in a polystyrene solution, the mass ratio of the polystyrene solution to the sodium hydroxide solution is 1:10, and then pour into an ultra-low temperature stirring tank, adjust the temperature in the ultra-low temperature stirring tank to -18°C, and the stirring speed to 100 rpm. After treating for 1 hour, filter out the solid, place in a freeze dryer, and freeze-dry at -18°C to constant weight to obtain a degradation agent;
[0026] (4) The biodegradable agent, SBS 1401, polypropylene PP s1003, glass fiber, silane coupling agent KH550, silicone oil and glycerin are uniformly mixed in a mass ratio of 10:8:48:1:0.5:0.5:3, melt-extruded at 190-210°C, blown film, slit, rolled and bagged to obtain a fully biodegradable glove bag.
[0027] Example 2; (1) Under a nitrogen atmosphere, 1.0 parts by weight of polystyrene powder and 25 parts by weight of dichloromethane were stirred at 30 rpm for 12 h, 1.2 parts by weight of 2-fluoroacetyl chloride and 0.08 parts by weight of aluminum chloride were added, and the mixture was reacted at 25° C. for 4 h to obtain a reaction solution, the reaction solution was first treated with tetrahydrofuran and a 3.8% by volume hydrochloric acid solution to fully wash away the aluminum chloride attached to the surface of the polystyrene powder, the pH of the reaction solution was adjusted to 6 with deionized water, and the pH of the reaction solution was then adjusted with anhydrous ethanol, the filtrate was filtered, and the filtrate was dried at 60° C. to constant weight to obtain a modified polystyrene powder;
[0028] (2) dissolving the modified polystyrene powder in toluene at a concentration of 20 mg / mL to obtain a polystyrene solution;
[0029] (3) Mix bagasse and 3 wt% sodium hydroxide solution in a mass ratio of 1:110 and place in a 2°C refrigerator for treatment for 16 hours, pour in a polystyrene solution, the mass ratio of the polystyrene solution to the sodium hydroxide solution is 1:18, and then pour into an ultra-low temperature stirring tank, adjust the temperature in the ultra-low temperature stirring tank to -18°C, and the stirring speed is 100 rpm. After treating for 1.5 hours, filter out the solid, place in a freeze dryer, and freeze-dry at -18°C to constant weight to obtain a degradation agent;
[0030] (4) The biodegradable agent, SBS 1401, polypropylene PP s1003, glass fiber, silane coupling agent KH560, silicone oil and glycerin are uniformly mixed in a mass ratio of 12:11:50:1:0.5:0.6:4, melt-extruded at 190-210°C, blown film, slit, rolled and bagged to obtain a fully biodegradable glove bag.
[0031] Example 3; (1) Under a nitrogen atmosphere, 1.2 parts by weight of polystyrene powder and 25 parts by weight of dichloromethane were stirred at 30 rpm for 12 h, 1.5 parts by weight of 2-fluoroacetyl chloride and 0.08 parts by weight of aluminum chloride were added, and the reaction was carried out at 25° C. for 5 h to obtain a reaction solution, and the reaction solution was treated with tetrahydrofuran and a 3.8% by volume hydrochloric acid solution respectively to fully wash away the aluminum chloride attached to the surface of the polystyrene powder, and then the pH of the reaction solution was adjusted to 6 with deionized water, and then the pH of the reaction solution was adjusted with anhydrous ethanol, and the filtrate was filtered and dried at 60° C. to constant weight to obtain a modified polystyrene powder;
[0032] (2) dissolving the modified polystyrene powder in toluene at a concentration of 20 mg / mL to obtain a polystyrene solution;
[0033] (3) Mix bagasse and 3 wt% sodium hydroxide solution in a mass ratio of 1:110 and place in a 2°C refrigerator for treatment for 16 hours, pour in a polystyrene solution, the mass ratio of the polystyrene solution to the sodium hydroxide solution is 1:25, and then pour into an ultra-low temperature stirring tank, adjust the temperature in the ultra-low temperature stirring tank to -18°C, and the stirring speed is 100 rpm. After treating for 2 hours, filter out the solid, place in a freeze dryer, and freeze-dry at -18°C to constant weight to obtain a degradation agent;
[0034] (4) The biodegradable agent, SBS 1401, polypropylene PP s1003, glass fiber, silane coupling agent KH570, silicone oil and glycerin are uniformly mixed in a mass ratio of 15:15:60:5:2:1:5, melt-extruded at 190-210°C, blown film, slit, rolled and bagged to obtain a fully biodegradable glove bag.
[0035] Comparative Example 1: The difference between Comparative Example 1 and Example 2 is that the polystyrene powder is not modified with 2-fluoroacetyl chloride, and the remaining steps are the same as Example 2.
[0036] Comparative Example 2; The difference between Comparative Example 2 and Example 2 is that the modified polystyrene powder is not dissolved and is directly added to the bagasse-sodium hydroxide solution, and the remaining steps are the same as Example 2.
[0037] Comparative Example 3; The difference between Comparative Example 3 and Example 2 is that the modified polystyrene powder is dissolved in toluene at a concentration of 10 mg / mL, and the remaining steps are the same as Example 2.
[0038] Comparative Example 4; The difference between Comparative Example 4 and Example 2 is that the modified polystyrene powder is dissolved in toluene at a concentration of 45 mg / mL, and the remaining steps are the same as Example 2.
[0039] Comparative Example 5: The difference between Comparative Example 5 and Example 2 is that SBS is not added, and the remaining steps are the same as Example 2.
[0040] Effect example
[0041] Table 1 below shows the performance analysis results of the fully biodegradable glove bags using Examples 1 to 3 of the present invention and Comparative Examples 1 to 5.
[0042] Table 1
[0043]
[0044] The present invention adopts 2-fluoroacetyl chloride modified polystyrene as the wrapping of the bagasse degrading agent. The modified polystyrene presents a porous structure through the dual changes of the solvent environment and the temperature. The microorganisms can contact the degrading agent through the micropores of the modified polystyrene by connecting the pores to the outside world, and can block the degrading agent from directly contacting the outside world. The degradable material can meet the requirements of daily use while being degradable. The ratio of the modified polystyrene to the bagasse is controlled to prevent excessive modified polystyrene coating from reducing the degradation rate, and too little modified polystyrene coating from affecting the mechanical properties of the glove bag.
[0045] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.
Claims
1. A fully biodegradable glove bag, characterized in that: The method comprises the following preparation steps: (1) Under a nitrogen atmosphere, 0.5-1.2 parts by weight of polystyrene powder with a molecular weight range of 5000-50000 and 19-30 parts by weight of dichloromethane are stirred at 30 rpm for 12 hours, 0.4-1.5 parts by weight of 2-fluoroacetyl chloride and 0.08 parts by weight of aluminum chloride are added, and the reaction is carried out at 25°C for 3-5 hours to obtain a reaction solution, and the reaction solution is first treated with tetrahydrofuran and a 3.8% by volume hydrochloric acid solution to fully wash away the aluminum chloride attached to the surface of the polystyrene powder, and then the pH of the reaction solution is adjusted to 6 with deionized water, and then the pH of the reaction solution is adjusted with anhydrous ethanol, and the filtrate is filtered and dried at 60°C to constant weight to obtain a modified polystyrene powder; (2) dissolving the modified polystyrene powder in toluene to obtain a polystyrene solution; (3) Mix bagasse and 3 wt% sodium hydroxide solution in a mass ratio of 1:108-110, place in a 0-4°C refrigerator for treatment for 12-18 hours, pour in a polystyrene solution, the mass ratio of the polystyrene solution to the sodium hydroxide solution is 1:10-25, pour into an ultra-low temperature stirring tank, adjust the temperature in the ultra-low temperature stirring tank to -18°C, and the stirring speed is 100 rpm. After treating for 1-2 hours, filter out the solid, place in a freeze dryer, and freeze-dry at -18°C to constant weight to obtain a degradation agent; (4) The biodegradable agent, SBS, polypropylene, glass fiber, silane coupling agent, defoaming agent and plasticizer are uniformly mixed in a mass ratio of 10-15:8-15:35-60:1-5:0.5-2:0.5-1:3-5, melt-extruded at 190-210°C, blown film, slit, rolled and bagged to obtain a fully biodegradable glove bag.
2. A fully biodegradable glove bag according to claim 1, characterized in that: The concentration of the polystyrene solution in step (2) is 10-45 mg / mL.
3. The fully biodegradable glove bag according to claim 1, characterized in that: The polypropylene melt index in step (4) is 3.6 g·(10 min) -1 .
4. The fully biodegradable glove bag according to claim 1, characterized in that: The silane coupling agent in step (4) is one of KH550, KH560 and KH570.
5. The fully biodegradable glove bag according to claim 1, characterized in that: The plasticizer in step (4) is glycerol.
6. The fully biodegradable glove bag according to claim 1, characterized in that: The defoaming agent in step (4) is silicone oil.
7. The fully biodegradable glove bag according to claim 1, characterized in that: The SBS in step (4) is SBS1401.
8. The fully biodegradable glove bag according to claim 1, characterized in that: The polypropylene in step (4) is polypropylene PP S1003.