Environment-friendly playing card and preparation method thereof

Abstract

The invention relates to the technical field of playing cards, in particular to an environment-friendly playing card and a preparation method thereof. The material main body of the environment-friendly playing card provided by the invention is degradable plastic poly (butylene adipate-co-terephthalate) and polylactic acid, and liquid crystal molecules capable of inducing orientation and a cross-linking agent capable of promoting cross-linking are introduced into the degradable plastic poly (butylene adipate-co-terephthalate) and polylactic acid; on one hand, the orientation of liquid crystal molecules is utilized to promote the orientation of poly (butylene adipate-co-terephthalate) and polylactic acid molecules, on the other hand, the cross-linking agent is adopted to further promote the connection of poly (butylene adipate-co-terephthalate) and polylactic acid molecules, and all the components can be well matched to act, so that the strength of the main body material is improved. In addition, the environment-friendly playing card has the advantages of degradability, excellent tensile strength, difficulty in breakage and good toughness.

Description

Technical Field

[0001] The present invention relates to the technical field of playing cards, and in particular to an environmentally friendly playing card and a preparation method thereof. Background Art

[0002] Playing cards are one of the main forms of entertainment that are popular among the public. China is a large consumer of playing cards. At present, most of the playing cards circulating in the market are paper playing cards, which have problems such as being difficult to use multiple times, being easily damaged, cracked, and having poor wear resistance, and are usually discarded after being used several times. In view of the problems of the above-mentioned paper playing cards, polyvinyl chloride plastic playing cards have emerged in the market. This kind of playing card has a good hand feeling, wear resistance, is not easily damaged, and has a relatively long service life. However, polyvinyl chloride is a non-degradable plastic, which brings the problem of white pollution to polyvinyl chloride playing cards. Therefore, the research and development of degradable sheets has become a research hotspot for those skilled in the art. Polybutylene adipate terephthalate (PBAT) material itself has good toughness. To improve the strength of polybutylene adipate terephthalate (PBAT), it is usually blended with polylactic acid (PLA). However, due to the difficult-to-completely-compatible characteristics between the two, simply using compatibilizers and the like is not sufficient to fully improve the strength of polybutylene adipate terephthalate (PBAT). Summary of the Invention

[0003] In view of this, the technical problem to be solved by the present invention is to provide an environmentally friendly playing card and a preparation method thereof. The environmentally friendly playing card provided by the present invention has degradability, excellent tensile strength, is not easily damaged, and has good toughness.

[0004] The present invention provides an environmentally friendly playing card, which is prepared from raw materials including the following parts by weight;

[0005]

[0006]

[0007] The degradable polymer includes polybutylene adipate terephthalate, polylactic acid, and degradable polymer a; the mass ratio of polybutylene adipate terephthalate, polylactic acid, and degradable polymer a is 20-50: 20-40: 0-10.

[0008] Preferably, the degradable polymer a includes at least one of poly (lactic-co-glycolic acid), polybutylene succinate, poly (butylene succinate terephthalate), and poly (ε-caprolactone).

[0009] Preferably, the filler includes at least one of calcium carbonate, talcum powder, and lignin; the mesh number is above 1500 mesh.

[0010] Preferably, the liquid crystal molecules include at least one of 4-(3-acryloyloxypropoxy)benzoic acid 2-methyl-1,4-phenylester and 1,4-diphenol bis(4-(6-acryloyloxy)hexyloxy)benzoate-2-methyl ester.

[0011] Preferably, the compatibilizer includes at least one of ADR-4468, ADR-4300, ADR-4370s, BF-7M, BF-E, BF-2B and BF-2C.

[0012] Preferably, the crosslinking agent includes at least one of dicumyl peroxide, benzoyl peroxide and di-tert-butyl peroxide.

[0013] Preferably, the silane coupling agent includes at least one of KH550, KH560, KH570, A-151 and A-171.

[0014] Preferably, the lubricant includes at least one of magnesium stearate, calcium stearate and zinc stearate;

[0015] The antioxidant includes at least one of antioxidant 1010, antioxidant 1076, antioxidant 264 and antioxidant 186.

[0016] The present invention also provides a preparation method of the above-mentioned environment-friendly playing cards, comprising the following steps:

[0017] S1: Stir and mix the dried degradable polymer with the filler, liquid crystal molecules, compatibilizer, crosslinking agent, silane coupling agent, lubricant and antioxidant to obtain a mixed material;

[0018] S2: Make the mixed material into a sheet;

[0019] S3: Perform surface printing and cutting on the sheet to obtain environment-friendly playing cards.

[0020] Preferably, in step S2), making the sheet is carried out in a twin-screw sheet machine;

[0021] The temperature of the screw zone of the twin-screw sheet machine is 150-200 °C, the temperature of the die head zone is 160-200 °C, and the temperature of the mirror roller zone is 45-75 °C.

[0022] The present invention provides an environmentally friendly playing card, which is prepared from the following raw materials in parts by weight: 40-100 parts of a degradable polymer; 10-30 parts of a filler; 0.1-1 part of liquid crystal molecules; 0.1-1 part of a compatibilizer; 0.1-1 part of a crosslinking agent; 0.1-2 parts of a silane coupling agent; 0.1-1 part of a lubricant; 0.1-1 part of an antioxidant; the degradable polymer is polybutylene adipate terephthalate (PBAT), polylactic acid (PLA) and a degradable polymer a; the mass ratio of polybutylene adipate terephthalate (PBAT), polylactic acid (PLA) and the degradable polymer a is 20-50:20-40:0-10. The main body of the material of the environmentally friendly playing card provided by the present invention is the degradable plastics polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA), and liquid crystal molecules and a crosslinking agent capable of inducing orientation are introduced therein. On the one hand, the orientation of liquid crystal molecules is used to promote the orientation of polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) molecules, and on the other hand, a crosslinking agent is used to further promote the connection of polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) molecules. Each component can cooperate well, thereby improving the strength of the main material. And the playing card can be biodegradable, has a good hand feeling, is wear-resistant, is not easy to be damaged, has good toughness, and is green and environmentally friendly. Detailed Embodiments

[0023] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The present invention provides an environmentally friendly playing card, which is prepared from the following raw materials in parts by weight:

[0025]

[0026] The degradable polymer is polybutylene adipate terephthalate (PBAT), polylactic acid (PLA) and a degradable polymer a; the mass ratio of polybutylene adipate terephthalate (PBAT), polylactic acid (PLA) and the degradable polymer a is 20-50:20-40:0-10; for example, 40:30:5, 20:20:0, 50:40:10.

[0027] In certain embodiments of the present invention, the degradable polymer a is selected from at least one of poly (lactic-co-glycolic acid) (PLGA), polybutylene succinate (PBS), poly (butylene succinate terephthalate) (PBST) and poly (ε-caprolactone) (PCL).

[0028] In certain embodiments of the present invention, the weight parts of the degradable polymer are 75 parts, 40 parts or 100 parts.

[0029] In certain embodiments of the present invention, the filler is at least one of calcium carbonate, talcum powder and lignin; the mesh number is above 1500 meshes. The weight parts of the filler are 25 parts, 10 parts or 30 parts.

[0030] In certain embodiments of the present invention, the liquid crystal molecules are at least one of 4-(3-acryloyloxypropoxy) benzoic acid 2-methyl-1,4-phenylester (RM257) and 1,4-diphenol bis(4-(6-acryloyloxy) hexyloxy) benzoic acid)-2-methyl ester (RM82). The weight parts of the liquid crystal molecules are 0.5 parts, 0.1 parts or 1 part.

[0031] In certain embodiments of the present invention, the compatibilizer is at least one of ADR-4468, ADR-4300, ADR-4370s, BF-7M (Sumitomo), BF-E (Sumitomo), BF-2B (Sumitomo) and BF-2C (Sumitomo). The weight parts of the compatibilizer are 0.3 parts, 0.1 parts or 1 part.

[0032] In certain embodiments of the present invention, the crosslinking agent is at least one of dicumyl peroxide (DCP), benzoyl peroxide (BPO) and di-tert-butyl peroxide (DTBP). The weight parts of the crosslinking agent are 0.2 parts, 0.1 parts or 1 part.

[0033] In certain embodiments of the present invention, the silane coupling agent is at least one of KH550, KH560, KH570, A-151 and A-171. The weight parts of the silane coupling agent are 0.5 parts, 0.1 parts or 2 parts.

[0034] In certain embodiments of the present invention, the lubricant is at least one of magnesium stearate, calcium stearate and zinc stearate. The weight parts of the lubricant are 0.2 parts, 0.1 parts or 1 part.

[0035] In certain embodiments of the present invention, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 264 and antioxidant 186. The weight parts of the antioxidant are 0.1 parts or 1 part.

[0036] The main material of the environmentally friendly playing cards provided by the present invention is biodegradable plastics polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA), and liquid crystal molecules and crosslinking agents that can induce orientation are introduced therein. On the one hand, the orientation of liquid crystal molecules is utilized to promote the orientation of polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) molecules. On the other hand, crosslinking agents are used to further promote the connection of polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) molecules. Each component can cooperate well, thereby improving the strength of the main material. And the playing cards can be biodegradable, have a good hand feeling, are wear-resistant, are not easily damaged, and are environmentally friendly.

[0037] The present invention also provides a preparation method of the above-mentioned environmentally friendly playing cards, comprising the following steps:

[0038] S1: Stir and mix the dried biodegradable polymer with fillers, liquid crystal molecules, compatibilizers, crosslinking agents, silane coupling agents, lubricants and antioxidants to obtain a mixed material;

[0039] S2: Make the mixed material into a sheet;

[0040] S3: Perform surface printing and cutting on the sheet to obtain environmentally friendly playing cards.

[0041] In step S1):

[0042] In certain embodiments of the present invention, the temperature for drying the biodegradable polymer is 50 - 70 °C, and the time is 2 - 4 h. The drying is carried out in an oven.

[0043] The rotation speed of the stirring and mixing is 100 - 500 rpm, and the time is 10 - 30 min. The stirring and mixing is carried out in a high-speed mixer.

[0044] In step S2):

[0045] In certain embodiments of the present invention, making the sheet is carried out in a twin-screw sheet machine.

[0046] The temperature of the screw zone of the twin-screw sheet machine is 150 - 200 °C, the temperature of the die head zone is 160 - 200 °C, and the temperature of the mirror roller zone is 45 - 75 °C.

[0047] Specifically, the temperatures of the screw zone of the twin-screw sheet machine are 150 °C, 155 °C, 160 °C, 165 °C, 165 °C, 170 °C, 170 °C, 170 °C respectively, the temperature of the die head zone is 165 °C, and the temperature of the mirror roller zone is 60 °C.

[0048] The thickness of the sheet is 0.25 - 0.35 mm, such as 0.3 mm.

[0049] In step S3):

[0050] In certain embodiments of the present invention, the surface printing is performed using a printing press; the cutting is performed using a die-cutting machine.

[0051] Beneficial effects:

[0052] The present invention uses degradable plastics as raw materials to prepare playing cards, so that the prepared playing cards have biodegradable properties, solving the problem of plastic white pollution caused by non-degradable plastic playing cards in the market.

[0053] While the playing cards provided by the present invention are biodegradable, compared with traditional paper playing cards, they ensure the hand feel, wear resistance, and non-easy-to-fold properties during the use of playing cards; at the same time, under normal use environmental conditions, the service life of this product is longer than that of paper playing cards that are not wear-resistant and easy to fold.

[0054] In order to improve the strength of the degradable sheet of the playing cards, the present invention introduces liquid crystal molecules that can be oriented to induce the molecular orientation of the matrix material, improving the mechanical properties. At the same time, a cross-linking agent that promotes cross-linking is introduced, enabling the molecules of polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) to be fully connected, further improving the mechanical properties.

[0055] Therefore, the present invention combines the advantages of the degradability of traditional paper playing cards and the good hand feel, wear resistance, and non-easy-to-fold properties of new plastic playing cards, while improving the mechanical properties of traditional degradable sheets.

[0056] The present invention has no special restrictions on the raw material sources used above, and they can be generally commercially available.

[0057] In order to further illustrate the present invention, the following describes in detail an environmentally friendly playing card and its preparation method provided by the present invention in combination with embodiments, but it should not be construed as a limitation on the protection scope of the present invention.

[0058] Example 1

[0059] An environmentally friendly playing card is prepared from the following raw materials in parts by weight;

[0060] 40 parts of polybutylene adipate terephthalate (PBAT), 30 parts of polylactic acid (PLA), 5 parts of poly (lactic-co-glycolic acid) (PLGA), 25 parts of filler 2000-mesh calcium carbonate, 0.5 part of liquid crystal molecule RM257, 0.3 part of compatibilizer ADR-4468, 0.2 part of cross-linking agent dicumyl peroxide (DCP), 0.5 part of silane coupling agent KH550, 0.2 part of lubricant magnesium stearate, and 0.1 part of antioxidant 1010.

[0061] The preparation method is as follows:

[0062] 1) Put poly(butylene adipate-co-terephthalate) (PBAT), polylactic acid (PLA) and poly(lactic-co-glycolic acid) copolymer into an oven and dry at 60 °C for 4 h to obtain the dried degradable polymer;

[0063] 2) Add the dried degradable polymer, filler, liquid crystal molecules, compatibilizer, crosslinking agent, silane coupling agent, lubricant and antioxidant into a high-speed mixer and stir and mix at a rotation speed of 200 rpm for 20 min to obtain a mixed material;

[0064] 3) Add the mixed material into a twin-screw sheet machine to make a sheet with a thickness of 0.3 mm; the temperatures of the screw zones of the twin-screw sheet machine are 150 °C, 155 °C, 160 °C, 165 °C, 165 °C, 170 °C, 170 °C, 170 °C respectively, the temperature of the die head zone is 165 °C, and the temperature of the mirror roller zone is 60 °C;

[0065] 4) Perform surface printing on the sheet through a printing machine and then cut it with a die-cutting machine to obtain an environmentally friendly playing card.

[0066] Comparative Example 1

[0067] The difference from Example 1 is that:

[0068] The weight fraction of the crosslinking agent dicumyl peroxide (DCP) is 0.

[0069] Comparative Example 2

[0070] The difference from Example 1 is that:

[0071] The weight fraction of the liquid crystal molecule RM257 is 0.

[0072] Comparative Example 3

[0073] The difference from Example 1 is that:

[0074] The weight fraction of the crosslinking agent dicumyl peroxide (DCP) is 0, and the weight fraction of the liquid crystal molecule RM257 is 0.

[0075] Comparative Example 4

[0076] The difference from Example 1 is that:

[0077] The weight fraction of polylactic acid (PLA) is 0, and the weight fraction of poly(butylene adipate-co-terephthalate) (PBAT) is 70 parts.

[0078] Comparative Example 5

[0079] The difference from Example 1 is that:

[0080] The weight fraction of poly(butylene adipate-co-terephthalate) (PBAT) is 0 parts, and the weight fraction of polylactic acid (PLA) is 70 parts.

[0081] Example 2

[0082] The difference from Example 1 is as follows:

[0083] The environment-friendly playing cards are prepared from the following raw materials in parts by weight;

[0084] 20 parts of poly(butylene adipate-co-terephthalate) (PBAT), 20 parts of polylactic acid (PLA), 10 parts of 2000-mesh calcium carbonate as filler, 0.1 part of liquid crystal molecule RM257, 0.1 part of compatibilizer ADR-4468, 0.1 part of crosslinking agent dicumyl peroxide (DCP), 0.1 part of silane coupling agent KH550, 0.1 part of lubricant magnesium stearate, and 0.1 part of antioxidant 1010.

[0085] Example 3

[0086] The difference from Example 1 is as follows:

[0087] The environment-friendly playing cards are prepared from the following raw materials in parts by weight;

[0088] 50 parts of poly(butylene adipate-co-terephthalate) (PBAT), 40 parts of polylactic acid (PLA), 10 parts of poly(lactic-co-glycolic acid) (PLGA), 30 parts of 2000-mesh calcium carbonate as filler, 1 part of liquid crystal molecule RM257, 1 part of compatibilizer ADR-4468, 1 part of crosslinking agent dicumyl peroxide (DCP), 2 parts of silane coupling agent KH550, 1 part of lubricant magnesium stearate, and 1 part of antioxidant 1010.

[0089] Example 4

[0090] The difference from Example 1 is as follows:

[0091] Replace poly(lactic-co-glycolic acid) (PLGA) with poly(butylene succinate) (PBS).

[0092] Example 5

[0093] The difference from Example 1 is as follows:

[0094] Replace poly(lactic-co-glycolic acid) (PLGA) with poly(butylene succinate-co-terephthalate) (PBST).

[0095] Example 6

[0096] The difference from Example 1 is as follows:

[0097] Replace liquid crystal molecule RM257 with RM82.

[0098] Performance tests were conducted on the playing cards prepared in Examples 1-6 and Comparative Examples 1-5 of the present invention, and the results are shown in Table 1 below. Among them, the tensile strength and elongation at break of the playing card sheets were tested in accordance with G / BT 1040.1-2018, and the folding endurance, longitudinal stiffness, glossiness and slipperiness were tested in accordance with QB / T 2228-2013.

[0099] Table 1 Performance test results of the playing cards prepared in Examples 1-6 and Comparative Examples 1-5

[0100]

[0101]

[0102] From the data in Table 1, it can be seen that the environmentally friendly playing cards of the present invention use degradable raw materials, and while ensuring the physical properties of the playing cards, they have the degradable properties that traditional polyvinyl chloride playing cards do not have. At the same time, compared with the case of not adding a cross-linking agent (Comparative Example 1), not using liquid crystal induced orientation (Comparative Example 2), and not using both (Comparative Example 3), and not adding PLA (Comparative Example 4), the playing card sheets prepared by the present invention have more advantages in terms of strength mechanical properties. Compared with not adding PBAT (Comparative Example 5), the playing card sheets prepared by the present invention have more advantages in terms of folding endurance and toughness.

[0103] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An environmentally friendly playing card, prepared from the following raw materials in parts by weight; The degradable polymer comprises polybutylene adipate terephthalate, polylactic acid and degradable polymer a; the mass ratio of polybutylene adipate terephthalate, polylactic acid and degradable polymer a is 20-50:20-40:0-10.

2. The environmentally friendly playing cards according to claim 1, characterized in that: The degradable polymer a includes at least one of poly(lactic acid-co-glycolic acid), poly(butylene succinate), poly(butylene terephthalate succinate) and poly(ε-caprolactone).

3. The environmentally friendly playing cards according to claim 1, characterized in that: The filler includes at least one of calcium carbonate, talcum powder and lignin; and the mesh size is above 1500 meshes.

4. The environmentally friendly playing cards according to claim 1, characterized in that: The liquid crystal molecules include at least one of 2-methyl-1,4-phenyl-4-(3-acryloxypropoxy)benzoate and 2-methyl-1,4-diphenolbis(4-(6-acryloxy)hexyloxy)benzoate.

5. The environmentally friendly playing cards according to claim 1, characterized in that: The compatibilizer includes at least one of ADR-4468, ADR-4300, ADR-4370s, BF-7M, BF-E, BF-2B and BF-2C.

6. The environmentally friendly playing cards according to claim 1, characterized in that: The cross-linking agent includes at least one of dicumyl peroxide, benzoyl peroxide and di-tert-butyl peroxide.

7. The environmentally friendly playing cards according to claim 1, characterized in that: The silane coupling agent includes at least one of KH550, KH560, KH570, A-151 and A-171.

8. The environmentally friendly playing cards according to claim 1, characterized in that: The lubricant comprises at least one of magnesium stearate, calcium stearate and zinc stearate; The antioxidant includes at least one of antioxidant 1010 , antioxidant 1076 , antioxidant 264 , and antioxidant 186 .

9. A method for preparing the environmentally friendly playing cards according to any one of claims 1 to 8, comprising the following steps: S1: mixing the dried degradable polymer with a filler, liquid crystal molecules, a compatibilizer, a crosslinking agent, a silane coupling agent, a lubricant and an antioxidant to obtain a mixed material; S2: Forming the mixed material into a sheet; S3: performing surface printing and cutting on the sheet to obtain environmentally friendly playing cards.

10. The preparation method according to claim 9, characterized in that: In step S2), the sheet is made in a twin-screw sheet making machine; The screw zone temperature of the twin-screw sheet machine is 150-200°C, the die zone temperature is 160-200°C, and the mirror roller zone temperature is 45-75°C.

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