Modified polylactic acid modified composite material and card preparation method thereof

Abstract

The invention discloses a modified polylactic acid modified composite material and a card preparation method thereof, and belongs to the field of card preparation. The composite material comprises 55-65% of a base material, 3-5% of a plasticizer, 3-5% of a flexibilizer, 15-25% of a reinforcing agent, 0.5-3% of a coupling agent, 0.03-0.05% of an antioxidant and 0.03-0.05% of an anti-ultraviolet agent. The base material is poly (L-lactic acid), poly (D-lactic acid) or a polylactic acid mixture; the plasticizer is tributyl citrate and triethylene glycol dicaprylate; the flexibilizer is MBS resin; the reinforcing agent is glass fiber and talcum powder filler; the coupling agent is a silane coupling agent. When the card is prepared, the composite material and the adhesive are put into a high-speed mixer at 110-130 DEG C for high-speed stirring, mixing and melting, and then extrusion is performed. The invention aims to solve the problems of insufficient mechanical properties, insufficient toughness, poor heat resistance, poor weather resistance and poor processability when a card is prepared from PLA, and provides an effective modification formula, a modification process and a card preparation process.

Description

Technical Field

[0001] The invention belongs to the field of card preparation, and in particular relates to a modified polylactic acid modified composite material and a card preparation method thereof. Background Art

[0002] At present, polylactic acid (PLA), as a biodegradable and environmentally friendly material, has broad application prospects in the field of card making. However, there are still some shortcomings and defects in the current production of PLA-based cards, which are mainly reflected in the following aspects: ① Insufficient mechanical properties: low strength. The strength and stiffness of pure PLA materials are relatively low, which makes it difficult to meet the requirements of some cards for high strength and high stiffness, such as ID cards and bank cards. ② Insufficient toughness. PLA materials have poor toughness and are fragile, and are prone to breakage during use. ③ Poor heat resistance and low heat deformation temperature. PLA has a low heat deformation temperature and is prone to deformation in high temperature environments, affecting the service life of the card. ④ Poor weather resistance. PLA materials are sensitive to environmental factors such as ultraviolet rays and oxygen, and are prone to aging, resulting in a decrease in card performance. ⑤ Processing performance needs to be improved. The melting temperature is high. PLA has a high melting temperature, high processing energy consumption, and a narrow processing window, which requires high processing equipment. ⑥ High cost. The raw material cost is high. Compared with traditional plastics, the raw material cost of PLA is high. ⑦ Single variety, limited color selection, the color selection of PLA materials is relatively limited, and it is difficult to meet personalized needs. Surface treatment is difficult, the surface treatment of PLA materials is relatively difficult, which affects the aesthetics and functionality of the card. Summary of the invention

[0003] 1. Technical issues to be solved

[0004] This technology aims to solve the problems of insufficient mechanical properties, insufficient toughness, poor heat resistance, poor weather resistance and poor processing performance when PLA is currently used to make cards. The present invention provides an effective modification formula and modification process of PLA, and a card making process.

[0005] (II) Technical solution

[0006] The purpose of the present invention is to provide a modified polylactic acid modified composite material, aiming to solve the above problems. To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A modified polylactic acid modified composite material and a card preparation method thereof, comprising 55-65% of base material, 3-5% of plasticizer, 3-5% of toughening agent, 15-25% of reinforcing agent, 0.5-3% of coupling agent, 0.03-0.05% of antioxidant and 0.03-0.05% of anti-ultraviolet agent.

[0008] Preferably, the matrix material is poly (L)-lactic acid, poly (D)-lactic acid or a poly (lactic acid) mixture.

[0009] Preferably, the plasticizer is tributyl citrate and triethylene glycol dicaprylate.

[0010] Preferably, the toughening agent is MBS resin.

[0011] Preferably, the reinforcing agents are glass fibers and talc fillers.

[0012] Preferably, the coupling agent is a silane coupling agent.

[0013] Preferably, it comprises an adhesive and a modified polylactic acid-modified composite material as claimed in any one of claims 1 to 6.

[0014] Preferably, the preparation method is as follows:

[0015] S1: a modified polylactic acid modified composite material and an adhesive are placed in a high-speed mixer at 110-130° C. and stirred and mixed to melt;

[0016] S2: A modified polylactic acid modified composite material is mixed and melted and then extruded.

[0017] Beneficial effects of the present invention:

[0018] Significantly improved mechanical properties

[0019] The tensile strength is greatly improved, 75-200% higher than that of ordinary polylactic acid cards. By adding reinforcing agents (such as glass fiber and talcum powder filler) and reasonable formula design, a more stable structure is formed inside the composite material, which effectively enhances the card's ability to withstand tensile force, meets the requirements of high strength and high rigidity for ID cards, bank cards, etc., and greatly improves the card's ability to resist deformation during use.

[0020] The toughness is significantly improved, and the problem of poor toughness and fragility of PLA material itself is effectively solved. The addition of toughening agent (such as MBS) improves the impact strength of the material, making the card less likely to be damaged when impacted by external force, extending the service life of the card and reducing the replacement cost caused by damage.

[0021] Enhanced heat resistance

[0022] The heat deformation temperature is increased, overcoming the defect of low heat deformation temperature of PLA. In high temperature environment, the card can maintain good shape stability and is not easy to deform, which is very important for cards that may be used in high temperature environment (such as outdoor use in summer or near heat source), ensuring the normal use of the card under various environmental conditions.

[0023] Improved weather resistance

[0024] The addition of antioxidants and anti-ultraviolet agents reduces the sensitivity of composite materials to environmental factors such as ultraviolet rays and oxygen, effectively delaying the aging process of the material. During long-term use, the card can maintain good performance, such as color stability and mechanical properties, reducing the performance degradation caused by aging, further extending the service life of the card and reducing the cost of use.

[0025] Processing performance optimization

[0026] The use of plasticizers (such as tributyl citrate and triethylene glycol dioctanoate) reduces the glass transition temperature of PLA and improves the flexibility and processability of the material. On the one hand, it reduces processing energy consumption, because lower processing temperature means less energy consumed during processing; on the other hand, it broadens the processing window, makes the processing easier to control, and reduces the requirements for processing equipment accordingly, which is conducive to improving production efficiency and reducing production costs.

[0027] Cost reduction

[0028] Under the premise of ensuring performance improvement, the cost is saved by 15-30%. Through reasonable raw material selection and formula optimization, the raw material cost is reduced while improving the card performance, and the cost performance of the product is improved, making this modified polylactic acid composite material more competitive in the market and conducive to its wide application and promotion in the field of card making.

[0029] Increased product diversity

[0030] The base material can be selected from poly (L) lactic acid, poly (D) lactic acid or their mixture, which enriches the product types to a certain extent. At the same time, it solves the problem of limited color selection of PLA materials and can better meet the personalized needs of different users, such as enterprises customizing cards with specific colors or logos, etc., which improves the market adaptability of products.

[0031] Enhanced surface treatment convenience

[0032] Due to the improvement of composite material performance, its surface treatment becomes relatively easy, which is conducive to improving the aesthetics and functionality of the card. For example, it is more convenient to perform surface treatment operations such as printing and coating, making the card surface smoother and more beautiful, while also increasing the card's waterproof and wear-resistant functions, improving user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of a flow chart provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method. The terms "upper end", "lower end", "left side", "right side", "front end", "rear end" and similar expressions used herein are positional relationships with reference to the accompanying drawings.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0037] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0038] like Figure 1 As shown, an embodiment of the present invention provides a modified polylactic acid modified composite material and a card preparation method thereof, including 55-65% of base material, 3-5% of plasticizer, 3-5% of toughening agent, 15-25% of reinforcing agent, 0.5-3% of coupling agent, 0.03-0.05% of antioxidant and 0.03-0.05% of anti-ultraviolet agent.

[0039] In the embodiment, the matrix material is poly (L)-lactic acid, poly (D)-lactic acid or a poly (lactic acid) mixture.

[0040] In the embodiment, the plasticizer is tributyl citrate and triethylene glycol dicaprylate.

[0041] In the embodiment, the toughening agent is MBS resin.

[0042] In the embodiment, the reinforcing agent is glass fiber and talc filler.

[0043] In the embodiment, the coupling agent is a silane coupling agent.

[0044] In the embodiment, it comprises an adhesive and a modified polylactic acid modified composite material as claimed in any one of claims 1 to 6.

[0045] In the embodiment, the preparation method is as follows:

[0046] S1: a modified polylactic acid modified composite material and an adhesive are placed in a high-speed mixer at 110-130° C. and stirred and mixed to melt;

[0047] S2: A modified polylactic acid modified composite material is mixed and melted and then extruded.

[0048] Example 2: 60 parts of poly (L) lactic acid, 5 parts of poly (D) lactic acid, 15 parts of talc, 10 parts of glass fiber, 3 parts of plasticizer, 3 parts of toughening agent, 3 parts of coupling agent, 0.05 parts of antioxidant, and 0.05 parts of anti-ultraviolet agent.

[0049] The materials in the above proportions were stirred at high speed using a high speed mixer: 900prm, 25min;

[0050] Add the highly mixed material into the parallel twin-screw extruder, thickness: 660*0.25mm;

[0051] Granulation process temperature:

[0052]

[0053] The flat sheets are produced by extrusion and cut to the required size.

[0054] Preparation of cards: Printing: Print various patterns, texts, etc. on the formed sheets. Compounding: Compound the sheets with other materials, such as electronic chips, RFID chips, etc. Cutting: Cut the sheets into cards of the required size.

[0055] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A modified polylactic acid modified composite material, characterized in that: The invention comprises 55-65% of base material, 3-5% of plasticizer, 3-5% of toughening agent, 15-25% of reinforcing agent, 0.5-3% of coupling agent, 0.03-0.05% of antioxidant and 0.03-0.05% of anti-ultraviolet agent.

2. The modified polylactic acid modified composite material according to claim 1, characterized in that: The matrix material is poly (L)-lactic acid, poly (D)-lactic acid or a poly (lactic acid) mixture.

3. A modified polylactic acid modified composite material according to claim 2, characterized in that: The plasticizers are tributyl citrate and triethylene glycol dicaprylate.

4. The modified polylactic acid modified composite material according to claim 3, characterized in that: The toughening agent is MBS resin.

5. The modified polylactic acid modified composite material according to claim 4, characterized in that: The reinforcing agents are glass fiber and talcum powder filler.

6. The modified polylactic acid modified composite material according to claim 5, characterized in that: The coupling agent is a silane coupling agent.

7. A method for preparing a card, characterized in that: The invention comprises an adhesive and a modified polylactic acid modified composite material as described in any one of claims 1 to 6.

8. The preparation of a card as claimed in claim 7, characterized in that: The preparation method is as follows: S1: putting the modified polylactic acid modified composite material and the adhesive into a high-speed mixer at 110-130° C. for high-speed stirring, mixing and melting; S2: The modified polylactic acid modified composite material is mixed and melted and then extruded.

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