CN112126157A

CN112126157A - Petroleum-based biodegradable material and product thereof

Info

Publication number: CN112126157A
Application number: CN202011048211.4A
Authority: CN
Inventors: 郭宇轩
Original assignee: Shantou Guohong Economic And Trade Co ltd
Current assignee: Shantou Guohong Economic And Trade Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2020-12-25

Abstract

The invention relates to a petroleum-based biodegradable material, which is characterized by comprising the following components in percentage by weight: 80-95% of petroleum-based polymer, 3-18% of non-toxic aromatic carboxylate and 2-10% of plasticizing auxiliary agent. The petroleum-based biodegradable material not only has the excellent functionality of the traditional plastic, but also has the biodegradable characteristic, and greatly shortens the required degradation time in the anaerobic environment. The invention also provides a biodegradable product, which is characterized in that: the biodegradable article is made from the petroleum-based biodegradable material.

Description

Petroleum-based biodegradable material and product thereof

Technical Field

The invention relates to the technical field of high polymer materials, in particular to a petroleum-based biodegradable material and a product thereof.

Background

As early as the 80's of the 20 th century, environmental protection organizations have begun to recognize the environmental pollution problems associated with disposable plastic articles. Because the service life of the disposable plastic is very short, the molecular structure is complex, and the disposable plastic can be degraded by the nature in hundreds of years after being discarded, the forming speed of the plastic garbage is far higher than the degradation speed of the plastic garbage by the nature. However, people have been accustomed to the great convenience brought by disposable plastic products in the past decades, and the industrial chain of disposable plastic products is well established in the market, so that the disposable plastic products directly and indirectly relate to a plurality of industries, and are deeply integrated into the daily life of each person, and the change of the habit requires a very long process and high conversion cost, so that the plastic cannot be prohibited globally on a large scale at present.

With the increasing importance of the plastic pollution problem, a series of semi-biodegradable materials or fully biodegradable materials are promoted in the market under the large environment of a series of plastic-limiting and plastic-prohibiting policies issued by governments of various countries. However, semi-biodegradable materials do not possess full biodegradability nor the usability and processability as conventional petroleum-based plastics possess. The main fully biodegradable materials on the market have the following problems:

(1) the use environment is poor: products manufactured by main full-biodegradable materials on the market are easy to be brittle and easy to crack at normal temperature, and if the products are not used for a long time at the normal temperature, the functionality of the products is also degraded, so that the products cannot be used; meanwhile, the products can not resist high temperature and low temperature, namely, the products shrink and deform when meeting hot water and are more easily cracked when meeting freezing, so that the application range of the products is greatly reduced, and a plurality of inconveniences are brought to consumers;

(2) the processing efficiency is low: most of the existing full-biodegradable materials need a secondary crystallization process in the process from processing to finished products, which has negative effects on the processing efficiency and the processing cost;

(3) poor recyclability: at present, most disposable products made of full-biodegradable materials can not be repeatedly processed, and the secondary processing can influence the use function of the disposable products, so the disposable products can only be discarded after being used, and can not be recycled and re-prepared into new finished products;

(4) the raw material cost is high: most of the current fully biodegradable materials have the cost 4 to 5 times that of the current common petroleum-based plastic raw materials;

(5) single degradation: at present, most of all-biodegradable materials can be degraded only under the condition of compost, only less than 15 percent of garbage is treated under the condition of compost all over the world at present, and most of garbage cannot be degraded in common landfill and seawater environment;

(6) the application range is narrow: at present, most of full-biodegradable materials can only be applied to the manufacture of products in the aspect of normal-temperature liquid or solid containers, and the application range is much narrower than that of common petroleum-based plastic products;

(7) crisis grain safety: the main component of the bio-based material comes from food, and a big problem faced by the world is food shortage, and under the large environment, if a large amount of semi-degradation products and degradation materials refined by food are developed and used, the current food shortage problem is aggravated, and even the food safety of human beings is directly endangered.

At present, the main disposable degradable products on the market cannot perfectly replace the traditional disposable plastic products in all aspects, namely, the disposable degradable products have the practicability of the traditional non-degradable plastic products while having effective biodegradability, so that a full biodegradable material which can be compared favorably with the traditional petroleum-based plastic in the aspects of functionality, cost and application range needs to be developed.

Disclosure of Invention

The problem to be solved by the invention is to provide a petroleum-based biodegradable material, which not only has the excellent functionality of the traditional plastics, but also has the biodegradable characteristic, and greatly shortens the required degradation time under the anaerobic environment. The technical scheme is as follows:

the petroleum-based biodegradable material is characterized by comprising the following components in percentage by weight: 80-95% of petroleum-based polymer, 3-18% of non-toxic aromatic carboxylate and 2-10% of plasticizing auxiliary agent.

The petroleum-based polymer is a common plastic raw material on the market at present, and can be traditional non-degradable materials such as PE (polyethylene), PVC (polyvinyl chloride), PP (polypropylene), PS (polystyrene), PET (polyethylene terephthalate) and the like, and can also be degradable polymers such as PCL (polycaprolactone), PVOH (polyvinyl alcohol), PBS (polybutylene succinate), PBAT (polybutylene adipate terephthalate) and the like.

In the fields of microbiology and organic chemistry, various microorganisms, in particular bacteria, have been studied to help increase the progress of polymer biodegradation and were published in the specialized journal Limnology and Oceanograpy Letters published by John Wiley & Sons (Wechman publishers) in the paper Micro-by-Micro interactions at pages 18-36, 5, 2020: among the numerous microorganisms that degrade plastics in marine and land habitats are described in How microorganisms affect the fate of marine micropoplasts (see journal 27 page 3 for details), some petroleum-based materials traditionally considered non-degradable, such as PE (polyethylene), PVC (polyvinyl chloride), PP (polypropylene), PS (polystyrene), etc., are included. On the other hand, the article "Direct sensing and signal transduction in chemotactic processes of aromatic compounds in Comamonas testosteroni" published in the journal of Molecular microbiology, Molecular microbiology 2016, p 224-237, published by Blackwell Scientific Publications (Blackwell, Brickwell, UK), 2016, also states that aromatic carboxylic acid esters can act as positive chemotactic agents for certain bacteria.

Therefore, the invention utilizes the positive chemotaxis of bacteria to aromatic carboxylate, adds non-toxic aromatic carboxylate into the existing petroleum-based polymer, and adds quantitative plasticizing auxiliary agent for catalysis, so that the non-toxic aromatic carboxylate can be fully mixed with plastic raw materials, and plasticizes the mixture in a molten state, so that molecules of the non-toxic aromatic carboxylate and the petroleum-based polymer mutually permeate into complementary gaps to form a mutual embedded structure, so that the petroleum-based polymer mixed with the non-toxic aromatic carboxylate keeps the original excellent functions, meanwhile, due to the chemotaxis of the non-toxic aromatic carboxylate to degradable plastic microorganisms, when the prepared plastic product is placed in natural environments such as water or soil, signals are continuously dispersed to induce the surrounding degradable plastic microorganisms to gather on the plastic product, and dozens of times of the degradable plastic microorganisms degrade the plastic product, compared with the traditional plastics, the biodegradation speed in natural environment is improved by dozens of times, the original degradation time of more than 100 years is required, the complete degradation can be realized in several years, the complete degradation can be realized in 5 years generally, and the degradation time required in anaerobic environment is greatly shortened.

The preparation of the petroleum-based biodegradable material adopts a common conventional technology, can refer to the existing common method for manufacturing plastics, pulverizes the petroleum-based polymer, adds non-toxic aromatic carboxylic ester, uniformly mixes the mixture, then adds a plasticizing auxiliary agent, heats and stirs the mixture, plasticizes the mixture in a molten state, and forms the petroleum-based biodegradable material through extrusion or tape casting.

In a preferred embodiment of the present invention, the non-toxic aromatic carboxylic acid ester is at least one of ethyl cinnamate or a derivative thereof, benzyl cinnamate or a derivative thereof, methyl benzoate or a derivative thereof, and ethyl benzoylacetate or a derivative thereof.

As a further preferable scheme of the invention, the plasticizing auxiliary agent comprises 1-5% by weight of palmitic acid and 1-5% by weight of glutaric acid or derivatives thereof.

The invention also provides a biodegradable product, which is characterized in that: the biodegradable article is made from the petroleum-based biodegradable material. The biodegradable article can be made from the petroleum-based biodegradable material by thermoforming, injection molding, blow molding, or the like.

Compared with the prior art, the invention has the following advantages:

(1) according to the invention, the positive chemotaxis of bacteria on aromatic carboxylate is utilized, non-toxic aromatic carboxylate is added into the existing petroleum-based polymer, and a quantitative plasticizing auxiliary agent is added for catalysis, so that the non-toxic aromatic carboxylate can be fully mixed with the petroleum-based polymer and is plasticized in a molten state, the molecules of the non-toxic aromatic carboxylate and the petroleum-based polymer are mutually permeated and complemented to form a mutual embedded structure, and the petroleum-based polymer mixed with the non-toxic aromatic carboxylate keeps the original superior functions;

(2) due to the tropism of non-toxic aromatic carboxylic ester to degradable plastic microorganisms, when the manufactured plastic product is placed in natural environments such as water or soil, signals are continuously dispersed to induce the surrounding degradable plastic microorganisms to gather on the plastic product, and dozens of times of degradable plastic microorganisms degrade the plastic product, compared with the traditional plastic, the biodegradation speed of the plastic product in the natural environment is improved by dozens of times, the original degradation time of more than 100 years is needed, the degradation time can be completely degraded in several years, the degradation time can be completely degraded in 5 years generally, and the degradation time needed in the anaerobic environment is greatly shortened.

Drawings

FIG. 1 is a graph of time-biodegradation rate according to a second preferred embodiment of the present invention;

FIG. 2 is a graph showing the time-biodegradation rate according to a third preferred embodiment of the present invention;

FIG. 3 is a graph showing the time-biodegradation rate according to example four of the preferred embodiment of the present invention;

FIG. 4 is a graph showing the time-biodegradation rate according to example V of the preferred embodiment of the present invention;

FIG. 5 is a graph showing the time-biodegradation rate according to example six of the preferred embodiment of the present invention.

Detailed Description

Example one

80% of polypropylene (PP) is crushed according to the weight parts, 10% of ethyl cinnamate is added for even mixing, 5% of glutaric acid and 5% of palmitic acid are added as plasticizing aids, the materials are heated, stirred and plasticized in a molten state to obtain the biodegradable material, and then the biodegradable material is adopted to prepare the disposable lunch box through a negative pressure forming process. The disposable meal box is placed in a conventional environment, and the phenomenon of surface loss and overall loss of the disposable meal box is not found after observation for 500 days by using an optical microscope.

Example two

The landfill degradation test was performed using the disposable lunch box made of the same material and by the same process as in the first example, and the specific test conditions, procedures, results and analyses were as follows:

test samples: the weight of the disposable lunch box is 12.56g, the average thickness is 0.45mm, and the initial total carbon content is 11 g;

inoculum (degradation vehicle): using 10kg of the total weight of the mixture of soil and household garbage obtained from the municipal solid waste dump, and crushing to obtain particles with the diameter less than 60 mm;

container and test environment: placing the inoculum and the test sample in a sealed transparent container, and placing the transparent container in a dark or low-light environment at normal temperature;

the testing process comprises the following steps:

(1) after the inoculum is placed into the container, observing the inoculum and regularly measuring the content of the biogas contained in the container every day until the inoculum is stabilized and the biogas is not released any more;

(2) placing the test sample into the inoculum in the container, immediately measuring the biogas content in the container after placing the test sample, and obtaining the total carbon content G of the biogas in the container before biodegradation of the test sample_E；

(3) Measuring the real-time total carbon content G of the biogas in the container at fixed time intervals (days)_BBy the following formula:

calculating the real-time biodegradation rate, wherein RB represents the biodegradation rate, G_BRepresenting the real-time total carbon content, G, of the biogas in the current day vessel_ERepresenting the total carbon content of the biogas in the container before biodegradation of the test sample, G_TIndicates the initial total carbon content of the test sample (G in this example)_T=11g）；

(4) The following table was prepared according to the continuous multi-day recording, and fig. 1 was prepared according to the following table:

time (sky)	Carbon dioxide (ml)	Methane (ml)	Carbon dioxide (g)	Methane (g)	Actual carbon content (g)	Biodegradation Rate (%)
							1	65.54	28.31	0.13	0.0201	0.05	0.00%
16	75.61	37.21	0.15	0.0264	0.06	0.10%
							31	138.91	68.36	0.27	0.0486	0.11	0.56%
46	281.13	138.35	0.56	0.0983	0.23	1.59%
							61	678.92	448.26	1.34	0.3185	0.60	5.05%
76	977.65	645.49	1.93	0.4587	0.87	7.47%
							91	1248.36	824.23	2.47	0.5857	1.11	9.66%
106	1510.52	997.31	2.99	0.7087	1.35	11.78%
							121	1827.73	1206.75	3.61	0.8575	1.63	14.35%
136	2211.55	1460.17	4.37	1.0376	1.97	17.46%
							151	2551.44	1684.58	5.05	1.1971	2.27	20.21%
166	2943.57	2077.49	5.82	1.4763	2.69	24.04%
							181	3395.97	2562.04	6.72	1.8206	3.20	28.60%
196	3917.89	2955.80	7.75	2.1005	3.69	33.07%
							211	4520.03	3410.07	8.94	2.4233	4.25	38.22%
226	5214.72	3934.16	10.31	2.7957	4.91	44.16%
							241	5846.58	4410.86	11.56	3.1345	5.50	49.57%
256	6199.11	4676.82	12.26	3.3235	5.83	52.59%
							271	6572.89	4958.82	13.00	3.5238	6.19	55.79%
286	6969.21	5257.81	13.78	3.7363	6.56	59.18%
							301	7247.54	5467.80	14.33	3.8855	6.82	61.56%
316	7536.99	5686.17	14.90	4.0407	7.09	64.04%
							331	7838.00	5913.26	15.50	4.2021	7.38	66.61%
346	8151.03	6149.42	16.12	4.3699	7.67	69.29%
							361	8476.56	6395.01	16.76	4.5444	7.98	72.07%
376	8547.78	6515.93	16.90	4.6304	8.08	73.01%
							391	8619.59	6639.14	17.04	4.7179	8.18	73.96%
406	8692.01	6764.67	17.19	4.8071	8.29	74.92%
							421	8765.04	6892.58	17.33	4.8980	8.40	75.90%
436	8838.68	7001.18	17.48	4.9752	8.49	76.78%
							451	8912.94	7111.49	17.62	5.0536	8.59	77.68%
466	8987.82	7223.54	17.77	5.1332	8.69	78.59%
							481	9063.33	7309.27	17.92	5.1941	8.78	79.38%
496	9139.48	7396.02	18.07	5.2558	8.87	80.17%
							511	9216.27	7483.80	18.22	5.3182	8.96	80.97%
526	9293.70	7572.62	18.38	5.3813	9.04	81.78%
							541	9371.78	7612.38	18.53	5.4095	9.11	82.36%
556	9437.07	7644.44	18.66	5.4323	9.16	82.83%

Test results and analysis: the test results show that the biodegradation process begins to occur between the 1 st day and the 30 th day, records the biogas release phenomenon which necessarily occurs in the degradation process, but the data is slowly increased because the test sample is at the surface physical loss stage at the beginning of the degradation process, and in the stage, the test sample still maintains the initial physical properties, namely, the material strength and the average molecular mass are not obviously changed, and meanwhile, the weight of the test sample is only negligibly reduced; starting at day 31, the data show that the biodegradation process continues, but unlike the previous stage, the rate of biodegradation increase begins to show a geometric increase, and this increase in rate continues to around day 350 because, in the previous stage, a portion of the sample begins to gradually enter the bulk physical loss while the test sample undergoes surface physical loss, and thus, the rate of biodegradation increase for the test sample is higher and higher as the bulk physical loss of the sample is more and more extensive and continues to occur from the beginning; meanwhile, after the test sample is internally lost to a certain degree, the weight decreasing and increasing speed is also increased geometrically from 121 days to 181 days of the test, and in this stage, the initial physical properties of the test sample begin to be disintegrated, namely the material strength is sharply reduced, the original bearing coefficient is lost, the average molecular mass is obviously reduced, and the sample weight is rapidly reduced; after a continuous rapid degradation process, the data show that biodegradation still occurs from day 351, but the rate of degradation is relatively reduced, and the rate of decrease in weight of the test sample is also significantly reduced after day 421, because the volume of the sample to be degraded is smaller, and thus the rate of increase is significantly slowed, but this does not mean that the biodegradation process is finished as it is.

According to the above table and fig. 1, the test sample of this example showed a biodegradation rate of 82% after 556 days of landfill under the simulated landfill environment, wherein the test sample showed significant surface loss beginning at day 31 and the test sample showed a biodegradation rate of more than 80% beginning at day 496, so that the data material can predict that the time required for complete degradation did not exceed 2 years.

EXAMPLE III

test samples: the weight of the disposable lunch box is 20.78g, the average thickness is 0.8mm, and the initial total carbon content is 12.88 g;

inoculum (degradation vehicle): removing visible impurities in seawater by using 20L of common seawater collected by seaside and a 120-mesh filter screen;

container and test environment: the same as the second embodiment;

the testing process comprises the following steps: the test procedure and the method for calculating the biodegradation rate in this example are the same as those in the second example, except that G is used in this example_T=12.88 g; the following table was prepared according to the test results, and fig. 2 was prepared according to the following table:

time (sky)	Carbon dioxide (ml)	Methane (ml)	Carbon dioxide (g)	Methane (g)	Actual carbon content (g)	Biodegradation Rate (%)
							1	1,540.78	1,409.63	3.05	1.00	1.58	0.00%
21	1,610.00	1,499.46	3.18	1.07	1.67	0.66%
							41	1,651.42	1,532.09	3.27	1.09	1.71	0.97%
61	1,750.38	1,628.23	3.46	1.16	1.81	1.78%
							81	1,839.03	1,674.37	3.64	1.19	1.88	2.35%
101	1,973.79	1,727.51	3.90	1.23	1.98	3.13%
							121	2,386.75	2,014.97	4.72	1.43	2.36	6.05%
141	2,776.16	2,350.26	5.49	1.67	2.75	9.06%
							161	3,188.55	2,741.34	6.31	1.95	3.18	12.40%
181	3,618.91	3,197.50	7.16	2.27	3.65	16.09%
							201	4,360.41	3,729.56	8.62	2.65	4.34	21.39%
221	4,883.74	4,350.16	9.66	3.09	4.95	26.15%
							241	5,119.67	5,074.03	10.12	3.61	5.46	30.13%
261	5,484.41	5,918.35	10.84	4.21	6.11	35.14%
							281	5,916.00	6,240.16	11.70	4.43	6.51	38.28%
301	6,353.27	6,579.47	12.56	4.68	6.93	41.51%
							321	6,480.08	6,937.22	12.81	4.93	7.19	43.52%
341	6,609.42	7,314.43	13.07	5.20	7.46	45.62%
							361	6,741.34	7,712.15	13.33	5.48	7.74	47.81%
381	6,875.89	8,131.50	13.60	5.78	8.04	50.11%
							401	6,940.88	8,573.65	13.72	6.09	8.31	52.21%
421	7,006.49	9,039.84	13.85	6.42	8.59	54.41%
							441	7,072.71	9,531.38	13.99	6.77	8.89	56.71%
461	7,139.57	9,651.51	14.12	6.86	8.99	57.49%
							481	7,207.05	9,773.16	14.25	6.95	9.09	58.28%
501	7,275.17	9,896.33	14.39	7.03	9.19	59.07%
							521	7,343.94	10,021.07	14.52	7.12	9.29	59.87%
541	7,413.35	10,147.37	14.66	7.21	9.40	60.69%
							561	7,483.42	10,275.26	14.80	7.30	9.51	61.51%
581	7,554.16	10,404.77	14.94	7.39	9.61	62.34%
							601	7,625.56	10,535.91	15.08	7.49	9.72	63.18%
621	7,697.64	10,613.36	15.22	7.54	9.80	63.80%
							641	7,770.40	10,691.38	15.37	7.60	9.88	64.43%
661	7,843.85	10,769.98	15.51	7.65	9.96	65.06%
							681	8,256.15	10,849.15	16.33	7.71	10.23	67.11%
701	8,273.49	10,928.91	16.36	7.77	10.28	67.52%
							721	8,290.87	11,009.25	16.39	7.82	10.33	67.92%
741	8,308.28	11,090.18	16.43	7.88	10.38	68.33%
							761	8,327.47	11,171.71	16.47	7.94	10.44	68.74%
781	8,346.71	11,253.83	16.50	8.00	10.49	69.16%
							801	8,365.99	11,336.56	16.54	8.06	10.55	69.59%
821	8,385.32	11,443.72	16.58	8.13	10.61	70.11%
							841	8,404.69	11,551.89	16.62	8.21	10.68	70.64%
861	8,424.11	11,661.08	16.66	8.29	10.75	71.17%
							881	8,443.57	11,771.30	16.70	8.36	10.82	71.71%
901	8,463.07	11,882.56	16.73	8.44	10.89	72.25%
							921	8,569.74	11,994.88	16.95	8.52	11.01	73.16%
941	8,677.75	12,108.25	17.16	8.60	11.13	74.08%
							961	8,787.12	12,222.70	17.38	8.69	11.24	75.01%
981	8,851.72	12,338.23	17.50	8.77	11.34	75.76%
							1001	8,916.79	12,480.78	17.63	8.87	11.45	76.62%
1021	8,982.34	12,624.97	17.76	8.97	11.56	77.49%
							1041	9,048.37	12,770.83	17.89	9.08	11.68	78.37%
1061	9,114.89	12,918.37	18.02	9.18	11.79	79.26%
							1081	9,181.90	13,067.62	18.16	9.29	11.91	80.15%
1101	9,249.39	13,218.59	18.29	9.39	12.02	81.06%
							1121	9,317.39	13,371.31	18.42	9.50	12.14	81.97%
1141	9,385.88	13,525.79	18.56	9.61	12.26	82.90%
							1161	9,454.88	13,682.06	18.70	9.72	12.38	83.83%
1181	9,499.56	13,840.13	18.78	9.84	12.49	84.67%
							1201	9,544.45	13,970.95	18.87	9.93	12.58	85.40%
1221	9,589.55	14,103.00	18.96	10.02	12.68	86.14%
							1241	9,634.87	14,236.31	19.05	10.12	12.77	86.88%
1261	9,680.40	14,370.87	19.14	10.21	12.87	87.62%
							1281	9,726.15	14,506.70	19.23	10.31	12.97	88.37%
1301	9,765.12	14,660.94	19.31	10.42	13.07	89.18%

Test results and analysis: the test results show that the biodegradation process begins to occur between day 1 and day 100, records the biogas release phenomenon which inevitably occurs in the degradation process, but the speed is increased slowly because the test sample is at the surface physical loss stage at the beginning of the degradation process, and in the stage, the test sample still maintains the initial physical properties, namely, the material strength and the average molecular mass are not obviously changed, and meanwhile, the weight of the test sample is only negligibly reduced; starting on day 101, the data show that the biodegradation process continues, but unlike the previous stage, the biodegradation rate increase begins to show a geometric increase, and this increase in increase continues up to around day 660 because in the previous stage, while the test sample undergoes surface physical loss, part of the sample begins to gradually enter into the overall physical loss, and therefore, as the overall physical loss of the sample involves a wider range and surface physical loss continues to occur from the beginning, the biodegradation rate of the test sample increases more and more, but the test sample expands more slowly at the internal loss, and after the test day 401, the weight decreases and increases in increase to show a geometric increase; in this stage, the initial physical properties of the test sample begin to collapse, i.e., the material strength is sharply reduced, the original total load-bearing capacity is also lost, the average molecular mass is significantly reduced, and the sample weight is rapidly reduced; the data show that the degradation rate increase continues relatively slower throughout the test from day 341, because the overall hydrolysis rate increase has reached a limit under the existing 20 liter inoculum capacity limit, but the weight of the test samples remains highly increased and decreased until the end of the test.

According to the table above and fig. 2, the test sample of this embodiment is buried in simulated marine waste for 1301 days, the biodegradation rate is as high as 89%, wherein the test sample starts to show significant surface loss at day 101, the biodegradation rate of the test sample starts to exceed 80% at day 1081, and the time required for complete degradation can be estimated from data materials to be about 4 years.

Example four

In the case where the other portions are the same as those of the embodiment, the difference is that: the biodegradable material of the test sample was made of 80% polypropylene, 18% ethyl cinnamate, 1% glutaric acid and 1% palmitic acid by weight, and fig. 3 was made based on the test results.

EXAMPLE five

In the case where the other portions are the same as those of the embodiment, the difference is that: the biodegradable material of the test sample was made of 83% polypropylene, 12% ethyl cinnamate, 3% glutaric acid and 2% palmitic acid by weight, and fig. 4 was made based on the test results.

EXAMPLE six

In the case where the other portions are the same as those of the embodiment, the difference is that: the biodegradable material of the test sample was made of 95% polypropylene, 3% ethyl cinnamate, 1% glutaric acid and 1% palmitic acid by weight, and fig. 4 was made based on the test results.

Based on the experimental data of examples one to six, the following table was prepared:

as can be seen from the above table: (1) the biodegradable material prepared by mixing the polypropylene with ethyl cinnamate can still keep the original functionality in the conventional environment, and the product can be used for a long time in the conventional environment; (2) the biodegradable material prepared by mixing the polypropylene with ethyl cinnamate can be degraded not only in the current refuse landfill environment but also in a seawater environment, and the degradation speed in the refuse landfill environment is higher than that in the seawater environment; (3) the weight ratio of the ethyl cinnamate has a certain influence on the biodegradation speed of a test sample in the same test environment, and the higher the weight ratio of the ethyl cinnamate is, the higher the biodegradation speed is.

In other embodiments, the polypropylene may be replaced by a conventional non-degradable petroleum-based polymer such as Polyethylene (PE), Polystyrene (PS), polyethylene terephthalate (PET), or a degradable petroleum-based polymer such as polybutylene adipate terephthalate (PBAT), or a mixture plasticized by a filler such as corn starch and polypropylene; the ethyl cinnamate can be replaced by one or a mixture of a derivative of ethyl cinnamate, benzyl cinnamate or a derivative thereof, methyl benzoate or a derivative thereof, and ethyl benzoylacetate or a derivative thereof, the glutaric acid can be replaced by a derivative of glutaric acid (such as 1, 5-pentanediol), and a time-biodegradation rate corresponding curve chart obtained by adopting corresponding test conditions and a test method basically conforms to the trend of the curve charts of the second embodiment to the sixth embodiment, except that the deviation exists between the surface loss starting time of a test sample and the time when the biodegradation rate of the test sample exceeds 80%.

In addition, in the above embodiments, a bio-based degradable polymer such as TPS (thermoplastic starch), PLA (polylactic acid), PHA (polyhydroxyalkanoate) or the like may be used instead of polypropylene, except that the bio-based polymer is not as wide as the petroleum-based polymer in the application range of the disposable article.

In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and the equivalent or simple change of the structure, the characteristics and the principle described in the present patent idea is included in the protection scope of the present patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The petroleum-based biodegradable material is characterized by comprising the following components in percentage by weight: 80-95% of petroleum-based polymer, 3-18% of non-toxic aromatic carboxylate and 2-10% of plasticizing auxiliary agent.

2. The petroleum-based biodegradable material of claim 1, wherein: the non-toxic aromatic carboxylic acid ester is at least one of ethyl cinnamate or derivatives thereof, benzyl cinnamate or derivatives thereof, methyl benzoate or derivatives thereof, and ethyl benzoylacetate or derivatives thereof.

3. A petroleum-based biodegradable material according to claim 1 or 2, characterized in that: the plasticizing auxiliary agent comprises 1-5 wt% of palmitic acid and 1-5 wt% of glutaric acid or derivatives thereof.

4. A biodegradable article characterized by: the biodegradable article is made from the petroleum-based biodegradable material of claim 1.