High-toughness biodegradable garbage filter bag and preparation method thereof

Abstract

The application provides a high-toughness biodegradable garbage filter bag and a preparation method thereof, and at least comprises the following raw materials: polylactic acid, polyol compound, silicate compound, inorganic filler, plasticizer and stabilizer. The application overcomes the brittleness of polylactic acid material through specific component proportioning, so that the prepared garbage filter bag has excellent toughness, the cracking resistance and deformation resistance are improved, and the garbage filter bag has good high-temperature resistance, so that the prepared garbage filter bag can firmly store more wet garbage, and the problems of health and odor caused by leakage in the transfer process are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of degradable garbage bags, specifically to the IPC classification number C08L3 / 04, and more specifically to a high-toughness biodegradable garbage filter water bag and a preparation method thereof. BACKGROUND

[0002] In recent years, people's living standards have gradually improved, and their environmental awareness has also become increasingly enhanced. In many places, the policy of garbage classification has already been implemented. When dealing with wet garbage, people usually need to first use a garbage bag to separately hold it, and then pour it into a wet garbage bin before throwing the garbage bag containing the wet garbage into a dry garbage bin, thereby causing unpleasant odors and hygiene problems, especially in hot summer, the odor is more intense. In view of the above problems, the applicant previously developed a high-temperature-resistant full-biodegradable food waste filter water bag and a preparation method thereof, which can withstand the high temperature of soup and can be thrown into a wet garbage bin together with wet garbage to avoid the generation of serious unpleasant odor, which has been disclosed in patent CN111334011A. However, the applicant found in actual use that although the filter water bag has good high-temperature resistance, its toughness and anti-deformation ability are poor, and it is easy to crack and leak during garbage transfer.

[0003] In addition, patent CN111732780A discloses a controllable degradable plastic garbage bag and a preparation method thereof. The garbage bag obtained by melt extrusion and film blowing of polyethylene, starch, hydrated Portland cement raw material, plasticizer, compatibilizer, and coupling agent has high degradation efficiency. However, its toughness and cracking resistance have not been studied.

[0004] Based on the above situation, the present application is improved and optimized on the basis of the original, and a garbage filter water bag with excellent toughness is prepared, and the present application is proposed. SUMMARY

[0005] In view of the above-mentioned technical problems, the present application provides a high-toughness biodegradable garbage filter water bag, which at least comprises the following raw materials: polylactic acid, polyol compound, silicate compound, inorganic filler, plasticizer, and stabilizer.

[0006] In some embodiments, the high-toughness biodegradable garbage filter water bag at least comprises the following raw materials in terms of weight parts: polylactic acid 65-78 parts, polyol compound 15-25 parts, silicate compound 1-4 parts, inorganic filler 1-5 parts, plasticizer 0.5-2 parts, and stabilizer 1-3 parts.

[0007] In some embodiments, the melt flow rate of the polylactic acid is 4-8 g / 10 min.

[0008] In some embodiments, the melt flow rate of the polylactic acid is 5-7 g / 10 min.

[0009] Preferably, the melt flow rate of the polylactic acid is 6 g / 10 min.

[0010] The test condition of the melt flow rate is 2.16 kg / 210°C.

[0011] In some embodiments, the inorganic filler comprises montmorillonite and fumed silica, and the weight ratio of the two is (1-2): 1.

[0012] Preferably, the inorganic filler comprises montmorillonite and fumed silica, and the weight ratio of the two is 1.5: 1.

[0013] In some embodiments, the particle size of the montmorillonite is 400-800 mesh.

[0014] Preferably, the particle size of the montmorillonite is 600 mesh.

[0015] In some embodiments, the average particle size of the fumed silica is 10-20 nm, and the BET area of the fumed silica is 80-150 m 2 / g.

[0016] Preferably, the average particle size of the fumed silica is 16 nm, and the BET area of the fumed silica is 90-130 m 2 / g.

[0017] In some embodiments, the plasticizer comprises diethyl malonate and / or tributyl citrate.

[0018] Preferably, the plasticizer comprises diethyl malonate and tributyl citrate, and the weight ratio is 1:(0.7-1.3).

[0019] More preferably, the plasticizer comprises diethyl malonate and tributyl citrate, and the weight ratio is 1:1.

[0020] In some embodiments, the silicate compound comprises hydrated magnesium silicate superfine powder.

[0021] Preferably, the particle size of the hydrated magnesium silicate superfine powder is 1000-1500 mesh.

[0022] More preferably, the particle size of the hydrated magnesium silicate superfine powder is 1250 mesh.

[0023] In some embodiments, the polyol compound comprises one or more of ethanol, ethylene glycol, propylene glycol, and glycerol.

[0024] Preferably, the polyhydric alcohol compound is ethylene glycol and glycerol, with a weight ratio of 1:(2-4).

[0025] More preferably, the polyhydric alcohol compound is ethylene glycol and glycerol, with a weight ratio of 1:3.

[0026] In some embodiments, the stabilizer comprises zinc stearate or calcium stearate.

[0027] Applicant developed a biodegradable food waste filter bag in the early stage of development, but in actual use, although the filter bag has good high temperature resistance, its toughness and anti-deformation ability are poor, and it is easy to crack and leak during garbage transfer. After a large amount of research, the applicant found that when a specific poly lactic acid and inorganic fillers, plasticizers, especially the melt flow rate of poly lactic acid is 4-8 g / 10 min, the inorganic fillers are montmorillonite and fumed silica, and the weight ratio of the two is (1-2):1, and the plasticizer is diethyl malonate and tributyl citrate, and the weight ratio is 1:(0.7-1.3), the prepared filter bag has excellent toughness, improves its cracking resistance and anti-deformation ability, so that the prepared garbage filter bag can firmly store more wet garbage, while having good high temperature resistance and degradation performance. The applicant believes that the possible reason is that on the one hand, the specific melt flow rate of poly lactic acid gives the system a suitable viscosity, which promotes diethyl malonate and tributyl citrate to weaken the interaction between polymer molecules, promotes the movement between molecular segments, and makes poly lactic acid molecules more easily relative slip and rearrangement. Meanwhile, the interface between montmorillonite with a specific particle size and poly lactic acid molecules produces strong interaction, in addition, the addition of montmorillonite can further promote the penetration of fumed silica into the vicinity of the Π bond of poly lactic acid, and produce overlap between the electron cloud, forming a spatial network structure, thereby greatly improving the toughness and cracking resistance of the garbage filter bag.

[0028] Another aspect of the present application provides a preparation method of a high-toughness biodegradable garbage filter bag, comprising at least the following steps:

[0029] (1) blowing film treatment is performed on the preparation raw material, and then bag making is performed at a speed of 12-18 m / min;

[0030] (2) the bottom and inclined side of the sample after bag making are heat sealed;

[0031] (3) the bag body and handle after heat sealing are punched, thereby obtaining the garbage filter bag.

[0032] In some embodiments, the specific method of blowing film is any method known to those skilled in the art, which can be adjusted according to the actual size of the mold used.

[0033] In some embodiments, the bag making by bottom sealing bag machine is processed.

[0034] In some embodiments, the oblique side heat sealing refers to heat sealing two corners of the bag bottom.

[0035] Beneficial effects: when the specific polylactic acid and inorganic filler, plasticizer, especially the melt flow rate of polylactic acid is 4-8g / 10min, the weight ratio of inorganic fillers is montmorillonite and fumed silica, and the weight ratio of the two is (1-2):1, and the plasticizer is diethyl malonate and tributyl citrate, and the weight ratio is 1:(0.7-1.3), the prepared water filter bag has excellent toughness, improves its cracking resistance and anti-deformation ability, so that the prepared garbage water filter bag can store more wet garbage firmly, and has good high temperature resistance and degradation performance. DETAILED DESCRIPTION

[0036] Example 1

[0037] The embodiment provides a high-toughness biodegradable garbage water filter bag, which comprises the following raw materials in parts by weight: polylactic acid 72 parts, polyol compound 20 parts, silicate compound 2.5 parts, inorganic filler 3 parts, plasticizer 1.2 parts, and stabilizer 2 parts.

[0038] The polylactic acid is purchased from Shanghai Furun Plastic Co., Ltd., the manufacturer is NatureWorks, USA, the model is Ingeo 7001D, and the melt flow rate is 6g / 10min.

[0039] The inorganic filler comprises montmorillonite and fumed silica, and the weight ratio of the two is 1.5:1.

[0040] The montmorillonite is purchased from Shijiazhuang Dakun Mineral Products Co., Ltd., and the particle size is 600 mesh.

[0041] The fumed silica is purchased from Wuhan Kemik Biological Medicine Technology Co., Ltd., the average particle size is 16nm, and the BET area of the fumed silica is 90-130m 2 / g.

[0042] The plasticizer comprises diethyl malonate and tributyl citrate, and the weight ratio is 1:1.

[0043] The silicate compound comprises hydrated magnesium silicate superfine powder, which is purchased from Hubei Dongcao Chemical Technology Co., Ltd., and the particle size is 1250 mesh.

[0044] The polyol compound is ethylene glycol and glycerol, and the weight ratio is 1:3.

[0045] The stabilizer is calcium stearate.

[0046] Another aspect of the embodiment provides a method for preparing a biodegradable garbage filter bag with high toughness, comprising the following steps:

[0047] (1) The raw materials are subjected to film blowing treatment to obtain a cylinder with a width of 230 mm, and then the bag is prepared at a speed of 16 m / min;

[0048] (2) The sample after bag preparation is subjected to bottom and inclined side heat sealing at 200°C;

[0049] (3) The bag body and handle after heat sealing are subjected to punching treatment, thereby obtaining the garbage filter bag.

[0050] Example 2

[0051] The embodiment provides a biodegradable garbage filter bag with high toughness, which comprises the following raw materials according to weight parts: 65 parts of polylactic acid, 15 parts of a polyol compound, 1 part of a silicate compound, 1 part of inorganic filler, 0.5 parts of plasticizer and 1 part of stabilizer.

[0052] The polylactic acid is purchased from Shanghai Furun Plastic Technology Co., Ltd., the manufacturer is NatureWorks, USA, the model is Ingeo 7001D, and the melt flow rate is 6 g / 10 min.

[0053] The inorganic filler comprises montmorillonite and fumed silica, and the weight ratio of the two is 1:1.

[0054] The montmorillonite is purchased from Shijiazhuang Dakun Mineral Products Co., Ltd., and the particle size is 600 mesh.

[0055] The fumed silica is purchased from Wuhan Kemik Biological Medicine Technology Co., Ltd., the average particle size is 16 nm, and the BET area of the fumed silica is 90-130 m 2 / g.

[0056] The plasticizer comprises diethyl malonate and tributyl citrate, and the weight ratio is 0.7:1.

[0057] The silicate compound comprises hydrated magnesium silicate superfine powder, which is purchased from Hubei Dongcao Chemical Technology Co., Ltd., and the particle size is 1250 mesh.

[0058] The polyol compound is ethylene glycol and glycerol, and the weight ratio is 1:2.

[0059] The stabilizer is calcium stearate.

[0060] Another aspect of the embodiment provides a method for preparing a biodegradable garbage filter bag with high toughness, comprising the following steps:

[0061] (1) the preparation raw materials are subjected to a film blowing treatment to obtain a cylinder material with a width of 230 mm, and then a bag is made at a speed of 16 m / min;

[0062] (2) the sample after bag making is subjected to bottom and inclined side heat sealing at 200℃;

[0063] (3) the bag body and handle after heat sealing are subjected to a punching treatment, thereby obtaining the garbage filter bag.

[0064] Embodiment 3

[0065] The embodiment provides a high-toughness biodegradable garbage filter bag, which comprises the following raw materials in parts by weight: 78 parts of polylactic acid, 25 parts of a polyol compound, 4 parts of a silicate compound, 5 parts of an inorganic filler, 2 parts of a plasticizer and 3 parts of a stabilizer.

[0066] The polylactic acid is purchased from Shanghai Furun Plastic Technology Co., Ltd., the manufacturer is NatureWorks, USA, and the model is Ingeo 7001D, and the melt flow rate is 6 g / 10 min.

[0067] The inorganic filler comprises montmorillonite and fumed silica, and the weight ratio of the two is 2:1.

[0068] The montmorillonite is purchased from Shijiazhuang Dakun Mineral Products Co., Ltd., and the particle size is 600 mesh.

[0069] The fumed silica is purchased from Wuhan Kemik Biological Medicine Technology Co., Ltd., the average particle size is 16 nm, and the BET area of the fumed silica is 90-130 m 2 / g.

[0070] The plasticizer comprises diethyl malonate and tributyl citrate, and the weight ratio is 1.3:1.

[0071] The silicate compound comprises hydrated magnesium silicate superfine powder, which is purchased from Hubei Dongcao Chemical Technology Co., Ltd., and the particle size is 1250 mesh.

[0072] The polyol compound is ethylene glycol and glycerol, and the weight ratio is 1:4.

[0073] The stabilizer is calcium stearate.

[0074] Another aspect of the embodiment provides a preparation method of the high-toughness biodegradable garbage filter bag, which comprises the following steps:

[0075] (1) the preparation raw materials are subjected to a film blowing treatment to obtain a cylinder material with a width of 230 mm, and then a bag is made at a speed of 16 m / min;

[0076] (2) The bagged sample is subjected to bottom and inclined side heat sealing at 200°C;

[0077] (3) The bag body and handle after heat sealing are subjected to punching treatment, thereby obtaining the garbage filter bag.

[0078] Example 4

[0079] The present example provides a high-toughness biodegradable garbage filter bag and a preparation method thereof, and the specific implementation manner is the same as that of Example 1, and the difference lies in that the inorganic filler does not include montmorillonite.

[0080] Example 5

[0081] The present example provides a high-toughness biodegradable garbage filter bag and a preparation method thereof, and the specific implementation manner is the same as that of Example 1, and the difference lies in that the plasticizer does not include diethyl malonate.

[0082] Performance test

[0083] 1. Elongation at break

[0084] The garbage filter bags prepared in Examples 1-4 are subjected to elongation at break test according to the standard of ASTM D638-03, and the test results are recorded in Table 1.

[0085] Table 1

[0086] No. Elongation at break (%) Example 1 125.52±10.36 Example 2 108.06±12.57 Example 3 113.73±15.45 Example 4 88.02±11.23 Example 5 94.87±9.94

Claims

1. A high-toughness biodegradable waste water filter bag, characterized in that, Based on parts by weight, it includes at least the following raw materials: 65-78 parts of polylactic acid, 15-25 parts of polyol compound, 1-4 parts of silicate compound, 1-5 parts of inorganic filler, 0.5-2 parts of plasticizer, and 1-3 parts of stabilizer. The melt flow rate of the polylactic acid is 4-8 g / 10 min; the test conditions for the melt flow rate are 2.16 kg / 210°C. The inorganic filler includes montmorillonite and fumed silica, and the weight ratio of the two is (1-2):1; The plasticizer comprises diethyl malonate and tributyl citrate in a weight ratio of 1:(0.7-1.3). The polyol compounds include one or more of ethanol, ethylene glycol, propylene glycol, and glycerol; The silicate compound includes hydrated magnesium silicate ultrafine powder.

2. The high-toughness biodegradable waste filter bag according to claim 1, characterized in that, The melt flow rate of the polylactic acid is 5-7 g / 10 min.

3. The high-toughness biodegradable waste filter bag according to claim 1, characterized in that, The particle size of the montmorillonite is 400-800 mesh.

4. The high-toughness biodegradable waste filter bag according to claim 1, characterized in that, The average particle size of the fumed silica is 10-20 nm.

5. A method for preparing a high-toughness biodegradable waste water filter bag according to any one of claims 1-4, characterized in that, At least the following steps are included: (1) The raw materials are blown into a film and then bagged at a speed of 12-18 m / min; (2) Heat seal the bottom and oblique sides of the bag-made sample; (3) Punch holes in the heat-sealed bag body and handle to obtain the garbage filter bag.