A kind of biodegradable fully bio-based coated paper capable of home composting and preparation method thereof

Abstract

The invention discloses a kind of biodegradable full-biobased coated paper and a preparation method thereof, and relates to the technical field of coated paper. The key points of the technical scheme are: comprising a composite coated special paper and a biodegradable film, and the raw materials for preparing the biodegradable film include by weight: PHBV: 60-90 parts, PBSA: 10-40 parts, compatibilizer: 0.1-2 parts, antioxidant: 0.1-0.5 parts, lubricant: 0.1-0.3 parts, plasticizer: 0.1-0.3 parts. The object of the present invention is to provide a kind of biodegradable full-biobased coated paper and a preparation method thereof.

Description

Technical Field

[0001] The invention relates to the technical field of coated paper, and more particularly to a fully bio-based coated paper capable of being composted and biodegradable at home and a preparation method thereof. Background Art

[0002] Paper is one of the best raw material choices for disposable products because it comes from nature and can be biodegraded after being discarded, or recycled and cleaned and then re-pulped to produce recycled paper.

[0003] However, when used in food contact products, paper does not have waterproof and oil-proof properties because its fibers are exposed, so its surface needs to be treated. The usual practice is to apply a polymer film on one or both sides of the paper to block water and oil. This processing technology is called paper laminating technology. The laminating technology effectively solves the disadvantage of poor barrier properties of paper, so it is widely used in various types of paper tableware.

[0004] The traditional laminating process uses polyethylene as the laminating layer because it has good processing performance and excellent barrier properties. The existing laminating paper has poor toughness and is prone to damage and peeling after long-term use, thus affecting its use effect.

[0005] Therefore, a new technical solution is urgently needed to solve the above technical problems. Summary of the invention

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide a fully bio-based coated paper that can be home-composted and biodegraded and a preparation method thereof.

[0007] The above technical purpose of the present invention is achieved through the following technical scheme: a home compostable biodegradable fully bio-based coated paper, including a composite coated special paper and a biodegradable film, wherein the raw materials for preparing the biodegradable film include, by weight: PHBV: 60-90 parts, PBSA: 10-40 parts, compatibilizer: 0.1-2 parts, antioxidant: 0.1-0.5 parts, lubricant: 0.1-0.3 parts, and plasticizer: 0.1-0.3 parts.

[0008] The present invention is further configured as follows: the PHBV is poly (3-hydroxybutyrate-co-3-hydroxyvalerate), which has a density of 1.23 g / cm3, an elastic modulus of 4200 MPA, a tensile elongation at break of 3%, and a melt mass flow rate of 5-10 g / 10 min at 190°C and a load of 2.16 kg; the PBSA is poly (butylene succinate-adipate), and has a melt mass flow rate of 10-20 g / 10 min at 190°C and a load of 2.16 kg.

[0009] The present invention is further configured as follows: the laminating paper is made of 20-50 μm thick full wood pulp paper, the biodegradable film is coated on the functional surface of the laminating paper, and is stored at 23° C. and 50% relative humidity.

[0010] The present invention is further configured as follows: the compatibilizer is one or more of poly (3-hydroxybutyrate-co-3-hydroxyvalerate) grafted glycidyl methacrylate (PHBV-g-GMA), PHBV-g-SMA, ADR, PBSA-g-MA, ADR4468.

[0011] The present invention is further configured as follows: the antioxidant is one or more of antioxidant 1010, antioxidant 168, triethyl phosphate, diethyl hydroxymethyl phosphate, melamine phosphate, dibutyl phosphate, aminosulfonic acid, and triphenylphosphine.

[0012] The present invention is further configured as follows: the lubricant is one or more of pentaerythritol stearate, isooctyl oleate, isooctyl stearate, dipentaerythritol ester, trimellitate, isooctyl palmitate, and neopentyl glycol heptanoate.

[0013] The present invention is further configured as follows: the plasticizer is prepared by compounding triethyl citrate (TEC) and polyethylene glycol (PEG) in a ratio of 1:0.3-2.

[0014] A method for preparing the home compostable biodegradable fully bio-based coated paper comprises the following steps: S1: Dry PHBV and PBSA at an air flow rate of 15 m³ / h at 60°C for 10 hours, add a compatibilizer, an antioxidant, a lubricant and a plasticizer and mix them evenly to obtain a mixture; S2: adding the mixture into an extruder for melting, extrusion and granulation, the temperature from the feed port to the die head is set to: 100°C, 150°C, 160°C, 165°C, 170°C, 175°C, 175°C, the rotation frequency is 100 rpm, the melt pressure is 35-40 bar, and a home compostable biodegradable resin is obtained; S3: After drying and dehumidifying the home compostable biodegradable resin, add it into a laminating machine, and use the laminating machine to laminate the special laminating paper. After the laminating is completed, the laminating special laminating paper is dried to obtain the home compostable biodegradable fully bio-based laminating paper.

[0015] The present invention has the following beneficial effects: when preparing the laminated paper, a compatibilizer is added to the raw materials, and the PHBV and PBSA can be effectively combined through the compatibilizer, so that the prepared laminated paper has good toughness, and the laminated film is not easy to be damaged or peeled off during use, thereby improving the use effect of the laminated paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the test result of the degradation rate of coated paper under home composting conditions. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings. Specific embodiment 1:

[0019] A fully bio-based coated paper that can be composted at home and can be biodegraded comprises a composite coated special paper and a biodegradable film. The raw materials for preparing the biodegradable film include, by weight, 60-90 parts of PHBV, 10-40 parts of PBSA, 0.1-2 parts of a compatibilizer, 0.1-0.5 parts of an antioxidant, 0.1-0.3 parts of a lubricant and 0.1-0.3 parts of a plasticizer.

[0020] When preparing the coated paper, a compatibilizer is added to the raw materials, and the PHBV and PBSA can be effectively combined through the compatibilizer, so that the prepared coated paper has good toughness, and the coating is not easy to be damaged or peeled off during use, thereby improving the use effect of the coated paper.

[0021] like Figure 1 As shown in the figure, the degradation rate test result of the coated paper under home composting conditions is shown in Table 1, which is the aging test result of the coated paper. Figure 1 As shown in Table 1, the degradation ability and anti-aging ability of coated paper can be effectively improved. Its degradation rate is better than that of cellulose after 125 days, and it also has good anti-aging ability.

[0022] Table 1:

[0023] PHBV is a polymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate) with a density of 1.23 g / cm3, an elastic modulus of 4200 MPA, a tensile elongation at break of 3%, and a melt mass flow rate of 5-10 g / 10 min at 190°C and a load of 2.16 kg; PBSA is polybutylene succinate-adipate with a melt mass flow rate of 10-20 g / 10 min at 190°C and a load of 2.16 kg.

[0024] The laminated paper is made of 20-50µm thick pure wood pulp paper. The biodegradable film is coated on the functional surface of the laminated paper and is stored at 23°C and 50% relative humidity.

[0025] The compatibilizer is one or more of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) grafted glycidyl methacrylate (PHBV-g-GMA), PHBV-g-SMA, ADR, PBSA-g-MA, and ADR4468.

[0026] The antioxidant is one or more of antioxidant 1010, antioxidant 168, triethyl phosphate, diethyl hydroxymethyl phosphate, melamine phosphate, dibutyl phosphate, aminosulfonic acid, and triphenylphosphine.

[0027] The lubricant is one or more of pentaerythritol stearate, isooctyl oleate, isooctyl stearate, dipentaerythritol ester, trimellitate, isooctyl palmitate and neopentyl glycol heptanoate.

[0028] The plasticizer is prepared by mixing triethyl citrate (TEC) and polyethylene glycol (PEG) in a ratio of 1:0.3-2. Specific embodiment 2:

[0030] A method for preparing biodegradable fully bio-based coated paper that can be composted at home, comprising the following steps: S1: Dry PHBV and PBSA at an air flow rate of 15 m³ / h at 60°C for 10 hours, add a compatibilizer, an antioxidant, a lubricant and a plasticizer and mix them evenly to obtain a mixture; S2: adding the mixture into an extruder for melting, extrusion and granulation, the temperature from the feed port to the die head is set to: 100°C, 150°C, 160°C, 165°C, 170°C, 175°C, 175°C, the rotation frequency is 100 rpm, the melt pressure is 35-40 bar, and the temperature of the final stage is maintained at 175°C during production to stabilize the melt flow, and finally a home compostable biodegradable resin is obtained; S3: After drying and dehumidifying the home compostable biodegradable resin, add it into a laminating machine, and use the laminating machine to laminate the special laminating paper. After the laminating is completed, the laminating special laminating paper is dried to obtain the home compostable biodegradable fully bio-based laminating paper.

[0031] The specific embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A fully biodegradable bio-based coated paper that can be composted at home, characterized by: The invention comprises composite laminating special paper and biodegradable film. The raw materials for preparing the biodegradable film include, by weight, 60-90 parts of PHBV, 10-40 parts of PBSA, 0.1-2 parts of compatibilizer, 0.1-0.5 parts of antioxidant, 0.1-0.3 parts of lubricant and 0.1-0.3 parts of plasticizer.

2. The home compostable biodegradable fully bio-based coated paper according to claim 1, characterized in that: The PHBV is poly (3-hydroxybutyrate-co-3-hydroxyvalerate), which has a density of 1.23 g / cm3, an elastic modulus of 4200 MPA, a tensile elongation at break of 3%, and a melt mass flow rate of 5-10 g / 10 min at 190°C and a load of 2.16 kg; the PBSA is poly (butylene succinate-adipate), and has a melt mass flow rate of 10-20 g / 10 min at 190°C and a load of 2.16 kg.

3. The home compostable biodegradable fully bio-based coated paper according to claim 1, characterized in that: The special laminating paper is made of 20-50 μm thick full wood pulp paper, the biodegradable film is coated on the functional surface of the special laminating paper, and is stored at 23° C. and 50% relative humidity.

4. The home compostable biodegradable fully bio-based coated paper according to claim 1, characterized in that: The compatibilizer is one or more of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) grafted glycidyl methacrylate (PHBV-g-GMA), PHBV-g-SMA, ADR, PBSA-g-MA, and ADR4468.

5. The home compostable biodegradable fully bio-based coated paper according to claim 1, characterized in that: The antioxidant is one or more of antioxidant 1010, antioxidant 168, triethyl phosphate, diethyl hydroxymethyl phosphate, melamine phosphate, dibutyl phosphate, aminosulfonic acid, and triphenylphosphine.

6. The home compostable biodegradable fully bio-based coated paper according to claim 1, characterized in that: The lubricant is one or more of pentaerythritol stearate, isooctyl oleate, isooctyl stearate, dipentaerythritol ester, trimellitate, isooctyl palmitate, and neopentyl glycol heptanoate.

7. The home compostable biodegradable fully bio-based coated paper according to claim 1, characterized in that: The plasticizer is prepared by compounding triethyl citrate (TEC) and polyethylene glycol (PEG) in a ratio of 1:0.3-2.

8. A method for preparing the home compostable biodegradable fully bio-based coated paper as claimed in claims 1-7, characterized in that: The steps include: S1: Dry PHBV and PBSA at an air flow rate of 15 m³ / h at 60°C for 10 hours, add a compatibilizer, an antioxidant, a lubricant and a plasticizer and mix them evenly to obtain a mixture; S2: adding the mixture into an extruder for melting, extrusion and granulation, the temperature from the feed port to the die head is set to: 100°C, 150°C, 160°C, 165°C, 170°C, 175°C, 175°C, the rotation frequency is 100 rpm, the melt pressure is 35-40 bar, and a home compostable biodegradable resin is obtained; S3: After drying and dehumidifying the home compostable biodegradable resin, add it into a laminating machine, and use the laminating machine to laminate the special laminating paper. After the laminating is completed, the laminating special laminating paper is dried to obtain the home compostable biodegradable fully bio-based laminating paper.

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