Degradable and environmentally friendly polyester film and environmentally friendly polyester composition

Abstract

The present invention discloses an environmentally friendly polyester film and an environmentally friendly polyester composition. The environmentally friendly polyester composition comprises 70 to 99 weight percent of a polymer raw material, wherein the polymer raw material comprises 40 to 50 weight percent of a dicarboxylic acid unit and 50 to 60 weight percent of a diol unit; 1 to 30 weight percent of a microbial attractant; 0.1 to 1 weight percent of an oxidant; and 0.1 to 10 weight percent of porous inorganic particles. The environmentally friendly polyester film comprises a heat-sealing layer and at least one polyester film layer, which is formed on the heat-sealing layer. The material of the heat-sealing layer and the polyester film layer is the environmentally friendly polyester composition, and the heat-sealing layer and at least one of the polyester film layers have different polymer raw materials.

Description

Technical Field

[0001] The invention relates to a polyester composition, in particular to an environmentally friendly polyester film and an environmentally friendly polyester composition. Background Art

[0002] Polymers with ester functional groups on the main chain are collectively referred to as polyester. In the prior art, polyester usually refers to polyethylene terephthalate (PET), which has the characteristics of light weight, impact resistance, non-breakage and high transparency. It is the most widely used plastic in PET bottles or food packaging films, and is also the first category among the seven major types of plastic waste.

[0003] Although PET can be recycled and melted to make polyester fibers from PET recycled materials, recycling cannot completely solve the problem of plastic abuse and environmental pollution. In recent years, in addition to promoting policies such as plastic reduction, countries around the world have also been committed to developing methods to decompose plastics.

[0004] In 2016, a strain of bacteria was found in a PET bottle recycling plant in Sakai City, Osaka Prefecture, Japan, which can almost completely decompose PET plastic. This bacteria was named "Ideonella sakaiensis 201-F6", also known as Osaka bacteria. Since then, polyester plastic products should be able to be digested and decomposed by Osaka bacteria and return to the ecosystem in a natural form; however, because the speed at which Osaka bacteria decompose polyester is still too slow, it is still unable to digest the excessive amount of polyester plastic waste in a timely manner.

[0005] Therefore, how to speed up the decomposition of PET plastic waste by Osaka bacteria through structural design improvements to overcome the above-mentioned defects has become one of the important issues that this project wants to solve. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an environmentally friendly polyester film and an environmentally friendly polyester composition thereof in view of the deficiencies in the prior art.

[0007] In order to solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention is to provide an environmentally friendly polyester composition, which comprises 70 weight percent to 99 weight percent of a polymer raw material, wherein the polymer raw material comprises 40 weight percent to 50 weight percent of a dicarboxylic acid unit and 50 weight percent to 60 weight percent of a diol unit; 1 weight percent to 30 weight percent of a microbial attractant; 0.1 weight percent to 1 weight percent of an oxidant; and 0.1 weight percent to 10 weight percent of porous inorganic particles.

[0008] In order to solve the above technical problems, another technical solution adopted by the present invention is to provide an environmentally friendly polyester film, which includes a heat-sealing layer and at least one polyester film layer formed on the heat-sealing layer. The heat-sealing layer and at least one polyester film layer are formed of the environmentally friendly polyester composition, and the heat-sealing layer and at least one polyester film layer have different polymer materials.

[0009] Further, the dicarboxylic acid unit comprises isophthalic acid, terephthalic acid, phthalic acid, cyclohexanedicarboxylic acid, naphthalene dicarboxylic acid or a combination thereof; and the diol unit comprises methylene glycol, 1,4-cyclohexanedimethanol, ethylene glycol, geminal glycol, propylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 2,2-propylene glycol, butylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 2,3-butylene glycol, 1,1-butylene glycol, 2,2-butylene glycol, isobutylene glycol, 1,2-isobutylene glycol, 1,3-isobutylene glycol, 1,1-isobutylene glycol, pentanediol, neopentyl glycol, 1,5-pentanediol, hexanediol, 2,3-dimethyl-2,3-butanediol, 2,5-dimethyl-2,5-hexanediol, diethylene glycol or a combination thereof.

[0010] Furthermore, the dicarboxylic acid unit comprises 30 weight percent to 49 weight percent of terephthalic acid and 1 weight percent to 10 weight percent of isophthalic acid, and the diol unit is neopentyl glycol.

[0011] Furthermore, the microbial attractant is a biodegradable polymer selected from the group consisting of polylactic acid (PLA), polyhydroxyalkanoates (PHAs), polybutylene succinate (PBS), polycaprolactone (PCL), polybutylene terephthalate-adipate (PBAT) and polyvinyl alcohol (PVA).

[0012] Furthermore, the microorganism attractant contains an organic decomposition aid selected from the group consisting of lactose, galactose, succinate, malate, aspartate and furanone derivatives.

[0013] Furthermore, the oxidant is at least one selected from hydrogen peroxide, urea hydrogen peroxide, urea, carbonate, periodic acid, periodate, perchloric acid, perchlorate, perbromic acid, perbromate, perboric acid, perborate, permanganic acid, permanganate, persulfate, bromate, chlorate, chlorite, chromate, iodate, iodic acid, ammonium persulfate, benzoyl peroxide, calcium peroxide, barium peroxide, sodium peroxide and urea peroxide.

[0014] Furthermore, the porous inorganic particles include silicon dioxide, aluminum oxide or a combination thereof.

[0015] Furthermore, the surface of the porous inorganic particles is modified with hydrophilic groups.

[0016] Furthermore, the hydrophilic group is an OH group, a CONH group, a CONH2 group, a SO3H group, a COOH group or a combination thereof.

[0017] One of the beneficial effects of the present invention is that the environmentally friendly polyester film and the environmentally friendly polyester composition provided by the present invention can, through the technical solution of "1 weight percent to 30 weight percent of microbial attractant; 0.1 weight percent to 1 weight percent of oxidant; and 0.1 weight percent to 10 weight percent of porous inorganic particles", allow the components of the environmentally friendly polyester composition to contain materials that can promote microbial decomposition. When the items made of the environmentally friendly polyester composition (for example, plastic bottles) are placed in a suitable decomposition environment after use, the environmentally friendly polyester composition can actively attract microorganisms to gather, thereby accelerating the speed of microbial decomposition of polyester.

[0018] Furthermore, the biodegradable polymer can be a polymer made from natural resources that can be obtained repeatedly, such as microorganisms, animals, and plants. The biodegradable polymer has the physical properties of traditional plastics and can replace traditional plastics based on petroleum, and is more environmentally friendly than traditional plastics.

[0019] It is worth noting that the organic decomposition aid has the effect of attracting microorganisms in the natural environment to approach, so as to promote the accelerated decomposition of the environmentally friendly polyester composition by microorganisms.

[0020] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. 4 is a cross-sectional schematic diagram of one embodiment of an environmentally friendly polyester film according to the second embodiment of the present invention.

[0022] Figure 2 FIG. 4 is a cross-sectional schematic diagram of another embodiment of the environmentally friendly polyester film of the second embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following is an explanation of the implementation methods of the "environmentally friendly polyester film and its environmentally friendly polyester composition" disclosed in the present invention through specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual sizes. It is stated in advance. The following implementation methods will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0024] It should be understood that, although the terms "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein may include any one or more combinations of the associated listed items depending on the actual situation.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. When a term appears in the singular, the plural form of the term is included.

[0026] Unless otherwise indicated, all percentages mentioned herein are by weight. When a series of upper and lower ranges are provided, all combinations of the ranges mentioned are contemplated, as if each combination were explicitly listed.

[0027] First embodiment

[0028] The first embodiment of the present invention provides an environmentally friendly polyester composition, which comprises at least 70 to 99 weight percent of a polymer raw material, 1 to 30 weight percent of a microbial attractant, 0.1 to 1 weight percent of an oxidant, and 0.1 to 10 weight percent of porous inorganic particles. The polymer raw material comprises at least 40 to 50 weight percent of a dicarboxylic acid unit and 50 to 60 weight percent of a diol unit.

[0029] Furthermore, the polymer raw materials are used to synthesize polyesters, wherein appropriate dicarboxylic acid units and dibasic units can be selected according to the needs to synthesize polyester plastics that can be decomposed by microorganisms (such as Osaka Bacteria), such as polyethylene terephthalate (PET).

[0030] Specifically, the dicarboxylic acid unit may be isophthalic acid, terephthalic acid, phthalic acid, cyclohexanedicarboxylic acid, naphthalene dicarboxylic acid or a combination thereof; and the diol unit may be methylene glycol, 1,4-cyclohexanedimethanol, ethylene glycol, geminal glycol, propylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 2,2-propylene glycol, butylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 2,3-butylene glycol, 1,1-butylene glycol, 2,2-butylene glycol, isobutylene glycol, 1,2-isobutylene glycol, 1,3-isobutylene glycol, 1,1-isobutylene glycol, pentanediol, neopentyl glycol, 1,5-pentanediol, hexanediol, 2,3-dimethyl-2,3-butanediol, 2,5-dimethyl-2,5-hexanediol, diethylene glycol or a combination thereof. However, these details are merely feasible implementations provided in this embodiment and are not intended to limit the present invention.

[0031] In this embodiment, the dicarboxylic acid unit is 30 weight percent to 49 weight percent of terephthalic acid and 1 weight percent to 10 weight percent of isophthalic acid, and the diol unit is neopentyl glycol.

[0032] Since polyester molecules are mostly composed of long hydrocarbon chains, lacking easily decomposed functional groups, and having extremely stable benzene rings bonded to their ester groups, polyesters have poor hydrophilicity and are difficult to hydrolyze. Therefore, the environmentally friendly polyester composition of the present invention includes a microbial attractant, preferably a hydrophilic carbon source or nitrogen source, such as starch, protein, and biodegradable raw materials, to increase the hydrophilicity of the environmentally friendly polyester composition, thereby attracting the aggregation of microorganisms and accelerating the speed at which microorganisms decompose the environmentally friendly polyester composition.

[0033] When the proportion of the microbial attractant is less than 1 weight percent, it is not enough to attract enough microorganisms to help decompose the polyester; however, when the proportion of the microbial attractant is higher than 30 weight percent, it will easily weaken the structural strength of the polyester. Therefore, 1 weight percent to 30 weight percent of the microbial attractant can ensure the attraction of microbial aggregation and the structural strength of the polyester during use.

[0034] The addition of an oxidant can accelerate the disintegration of the molecular structure when the environmentally friendly polyester composition is in a decomposition treatment state. For example, the oxidant can be at least one selected from hydrogen peroxide, urea hydrogen peroxide, urea, carbonate, periodic acid, periodate, perchloric acid, perchlorate, perbromic acid, perbromate, perboric acid, perborate, permanganic acid, permanganate, persulfate, bromate, chlorate, chlorite, chromate, iodate, iodic acid, ammonium persulfate, benzoyl peroxide, calcium peroxide, barium peroxide, sodium peroxide and urea peroxide. In this embodiment, the oxidant is hydrogen peroxide, which increases the hydrophilicity of the polyester composition.

[0035] Furthermore, the microporous structure of the porous inorganic particles themselves allows the environmentally friendly polyester composition to be in a decomposition state, providing a better growth environment for microorganisms, thereby promoting the reproduction of microorganisms and accelerating the decomposition of the environmentally friendly polyester composition. The porous inorganic particles can be silicon dioxide, aluminum oxide or a combination thereof. It is worth mentioning that in order to provide a better growth environment for microorganisms, the surface of the porous inorganic particles can be modified with hydrophilic groups, such as: amide groups (CONH, CONH2 groups), carboxyl groups (COOH), sulfonic groups (SO3H), hydroxyl groups (OH) or a combination thereof. In this embodiment, the porous inorganic particles are silicon dioxide. However, these details are only feasible implementation methods provided in this embodiment, and are not intended to limit the present invention.

[0036] The environmentally friendly polyester composition of the present invention can be used as plastic containers or products such as PET bottles and food packaging films.

[0037] Second embodiment

[0038] See also Figure 1 As shown, the second embodiment of the present invention provides an environmentally friendly polyester film F, which includes a heat-sealing layer 10 and at least one polyester film layer 20 formed on the heat-sealing layer 10. In this embodiment, the number of the polyester film layers 20 is two. The heat-sealing layer and each polyester film layer 20 are formed of the environmentally friendly polyester composition described in the first embodiment of the present invention. It is worth mentioning that the heat sealing layer 10 and each polyester film layer 20 have different polymer raw materials. For example, in this embodiment, the dicarboxylic acid units of the heat sealing layer 10 are isophthalic acid, terephthalic acid, and phthalic acid, and the diol units are 1,3-isobutylene glycol, 1,1-isobutylene glycol, and pentanediol; and the dicarboxylic acid units of each polyester film layer 20 are isophthalic acid and terephthalic acid, and the diol units are ethylene glycol; in other words, each layer of the environmentally friendly polyester film F must contain 1 weight percent to 30 weight percent of the microorganism attraction source B; 0.1 weight percent to 1 weight percent of the oxidant O; and 0.1 weight percent to 10 weight percent of the porous inorganic particles P.

[0039] Furthermore, each polyester film layer 20 may have the same or different polymer materials. For example, Figure 1 The environmentally friendly polyester film F shown in FIG. 1 has two polyester film layers 20 made of the same polymer raw material; Figure 2 The environmentally friendly polyester film F shown has two polyester film layers 20 and 20 ′ made of different polymer materials.

[0040] The specific preparation method of the environmentally friendly polyester film F can be to prepare the film by using a biaxial stretching process to co-extrude a multi-layer film. However, the above example is only one feasible embodiment and is not intended to limit the present invention.

[0041] In specific implementation, after the environmentally friendly polyester film is used up, it is placed in an appropriate decomposition environment, for example: buried in soil containing microorganisms; first, the microorganisms will be attracted by the microbial attractant, digest and decompose the microbial attractant first, which will cause countless tiny holes in the environmentally friendly polyester film, thereby increasing the contact area; at the same time, the porous inorganic particles can provide a good culture environment for microorganisms, promote the reproduction of microorganisms, and thus accelerate decomposition; thirdly, the oxidant can accelerate the chemical reaction, breaking the environmentally friendly polyester film into tiny fragments, helping the microorganisms to decompose the environmentally friendly polyester film.

[0042] Decomposition test

[0043] The decomposition rate of the biodegradable cling film of Experimental Example 1 in seawater was tested. In this test, the biodegradable cling film of Experimental Example 1 was placed in seawater for 30 days.

[0044] Table 1

[0045]

[0046]

[0047] Advantageous Effects of Embodiments

[0048] One of the beneficial effects of the present invention is that the environmentally friendly polyester film and the environmentally friendly polyester composition provided by the present invention can, through the technical solution of "1 weight percent to 30 weight percent of microbial attractant; 0.1 weight percent to 1 weight percent of oxidant; and 0.1 weight percent to 10 weight percent of porous inorganic particles", allow the components of the environmentally friendly polyester composition to contain materials that can promote microbial decomposition. When the items made of the environmentally friendly polyester composition (for example, plastic bottles) are placed in a suitable decomposition environment after use, the environmentally friendly polyester composition can actively attract microorganisms to gather, thereby accelerating the speed of microbial decomposition of polyester.

[0049] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the protection scope of the claims of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention description and drawings are included in the protection scope of the claims of the present invention.

Claims

1. An environmentally friendly polyester composition, characterized in that: The environmentally friendly polyester composition comprises: 70 to 99 weight percent of a polymeric raw material, wherein the polymeric raw material comprises 40 to 50 weight percent of dicarboxylic acid units and 50 to 60 weight percent of diol units; 1 to 30 weight percent of a microbial attractant; 0.1 to 1 weight percent of an oxidizing agent; and 0.1 weight percent to 10 weight percent of porous inorganic particles, wherein the porous inorganic particles include silicon dioxide, aluminum oxide or a combination thereof.

2. The environmentally friendly polyester composition according to claim 1, characterized in that: The dicarboxylic acid unit comprises isophthalic acid, terephthalic acid, phthalic acid, cyclohexanedicarboxylic acid, naphthalene dicarboxylic acid or a combination thereof; and the diol unit comprises 1,4-cyclohexanedimethanol, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 2,3-butylene glycol, 1,2-isobutylene glycol, 1,3-isobutylene glycol, neopentyl glycol, 1,5-pentanediol, hexanediol, 2,3-dimethyl-2,3-butylene glycol, 2,5-dimethyl-2,5-hexanediol, diethylene glycol or a combination thereof.

3. The environmentally friendly polyester composition according to claim 2, characterized in that: The dicarboxylic acid unit comprises 30 to 49 weight percent of terephthalic acid and 1 to 10 weight percent of isophthalic acid, and the diol unit is neopentyl glycol.

4. The environmentally friendly polyester composition according to claim 1, characterized in that: The microorganism attractant is a biodegradable polymer, wherein the biodegradable polymer is selected from the group consisting of polylactic acid, polyhydroxyalkanoate, polybutylene succinate, polycaprolactone, polybutylene terephthalate-adipate-polyvinyl alcohol.

5. The environmentally friendly polyester composition according to claim 1, characterized in that: The microorganism attractant contains an organic decomposition aid, and the organic decomposition aid is selected from the group consisting of lactose, galactose, succinate, malate, aspartate and furanone derivatives.

6. The environmentally friendly polyester composition according to claim 1, characterized in that: The oxidant is at least one selected from hydrogen peroxide, urea hydrogen peroxide, urea, carbonate, periodic acid, periodate, perchloric acid, perchlorate, perbromic acid, perbromate, perboric acid, perborate, permanganic acid, permanganate, persulfate, bromate, chlorate, chlorite, chromate, iodate, iodic acid, ammonium persulfate, benzoyl peroxide, calcium peroxide, barium peroxide, sodium peroxide and urea peroxide.

7. The environmentally friendly polyester composition according to claim 1, characterized in that: The surfaces of the porous inorganic particles are modified with hydrophilic groups.

8. The environmentally friendly polyester composition according to claim 7, characterized in that: The hydrophilic group is an OH group, a CONH2 group, a SO3H group, a COOH group or a combination thereof.

9. An environmentally friendly polyester film, characterized in that: The environmentally friendly polyester film comprises: a heat seal layer; and at least one polyester film layer formed on the heat-sealing layer; The heat-sealing layer and at least one of the polyester film layers are formed of the environmentally friendly polyester composition according to claim 1, and the heat-sealing layer and at least one of the polyester film layers have different polymer raw materials.

10. The environmentally friendly polyester film according to claim 9, characterized in that: The microorganism attractant is selected from the group consisting of polylactic acid, polyhydroxyalkanoate, polybutylene succinate, polycaprolactone, polybutylene terephthalate-adipate-butylene ester and polyvinyl alcohol.

11. The environmentally friendly polyester film according to claim 9, characterized in that: The microorganism attractant contains an organic decomposition aid, and the organic decomposition aid is selected from the group consisting of lactose, galactose, succinate, malate, aspartate and furanone derivatives.

12. The environmentally friendly polyester film according to claim 9, characterized in that: The surfaces of the porous inorganic particles are modified with hydrophilic groups.

13. The environmentally friendly polyester film according to claim 12, characterized in that: The hydrophilic group is an OH group, a CONH2 group, a SO3H group, a COOH group or a combination thereof.

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