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Waterproof starch film taking biodegradable polyurethane as coating and preparation method of waterproof starch film

A polyurethane coating and biodegradable technology, applied in polyurea/polyurethane coatings, coatings, bio-packaging, etc., can solve problems such as poor interface compatibility and poor water resistance of starch films, and achieve good mechanical properties and low production costs. Effects from a wide range of sources

Inactive Publication Date: 2020-09-04
施塔希(绍兴)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of poor water resistance of starch film, poor interfacial compatibility between waterproof material and hydrophilic starch and the realization of industrialized production, the present invention provides a waterproof starch film coated with biodegradable polyurethane and a preparation method thereof

Method used

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  • Waterproof starch film taking biodegradable polyurethane as coating and preparation method of waterproof starch film
  • Waterproof starch film taking biodegradable polyurethane as coating and preparation method of waterproof starch film
  • Waterproof starch film taking biodegradable polyurethane as coating and preparation method of waterproof starch film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of waterproof starch film that is coated with biodegradable polyurethane water emulsion is prepared by the following steps:

[0044] (1) Preparation and pretreatment of whole starch film materials: 100 parts of acetylated starch is used as raw material, 30 parts of glycerin is added as a plasticizer, and co-rotating parallel twin-screw extruder (model is LTE20-40) is used to extrude The machine has eight temperature control zones, each temperature is (feed port) 90°C, 125°C, 125°C, 125°C, 130°C, 130°C, 130°C, 120°C (head), and the speed is 60rpm. Pellet to obtain thermoplastic starch. Extrusion casting mechanism is used for full starch film, and the barrel of the casting machine has eight temperature control zones, each temperature is (feed port) 40°C, 60°C, 90°C, 120°C, 120°C, 120°C, 100°C ℃, 95℃ (machine head). The extruded film is collected by a traction device, and the thickness of the extruded film is about 0.30 mm. The obtained starch film material was p...

Embodiment 2

[0048] The difference between this embodiment and embodiment 1 is: 0.1 mol polycaprolactone diol, 0.3 mol toluene diisocyanate (TDI-100). Other steps and parameters are the same as in Example 1. Samples were prepared according to the GB / T 1040.3-2006 test standard, and the tensile strength and elongation at break of the film were tested. Samples were prepared according to the GB / T 30693-2014 test standard, and the contact angle between the film and water was tested. The results are shown in Table 1.

Embodiment 3

[0050] The difference between this embodiment and embodiment 1 is: 0.1 mol polycaprolactone diol, 0.4 mol toluene diisocyanate (TDI-100). Other steps and parameters are the same as in Example 1. Samples were prepared according to the GB / T 1040.3-2006 test standard, and the tensile strength and elongation at break of the film were tested. Samples were prepared according to the GB / T 30693-2014 test standard, and the contact angle between the film and water was tested. The results are shown in Table 1.

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Abstract

The invention discloses a waterproof starch film taking biodegradable polyurethane as a coating and a preparation method of the waterproof starch film. The waterproof starch film comprises a full-starch-based film material core layer and biodegradable polyurethane coatings on the two sides of the core layer. The biodegradable polyurethane coating is formed in the following mode: (1) fully stirringand reacting polycaprolactone polyol and polyisocyanate under the protection of nitrogen to prepare a prepolymer, then adding a hydrophilic chain extender, a catalyst, a salt-forming agent and a prepolymer solvent into the prepolymer, continuously and fully stirring and reacting, finally dispersing in water, and uniformly stirring to prepare a biodegradable polyurethane aqueous emulsion; and (2)respectively coating two surfaces of the core layer with the biodegradable polyurethane aqueous emulsion, and then drying to form a film so as to form the biodegradable polyurethane coating. The prepared waterproof starch film has good mechanical properties, wet mechanical properties and waterproof properties, and is wide in raw material source, convenient to process, low in production cost and easy to realize industrial production.

Description

technical field [0001] The invention relates to a waterproof starch film, in particular to a waterproof starch film coated with biodegradable polyurethane and a preparation method thereof. Background technique [0002] Starch-based materials are cheap, have good biocompatibility and biodegradability, and have been used in drug delivery, packaging and agriculture. With the country's emphasis on environmental protection, starch-based degradable packaging materials have become the focus of attention. However, during the use as an outer packaging material, in addition to the water vapor generated by the external environment, the whole starch film will completely lose its strength after a large amount of water contact; during the use as an inner food packaging material, the food in the box will also If water vapor is generated, if the whole starch film is directly used for packaging, due to the strong hydrophilicity of starch molecules, starch-based materials will be easily affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D175/06C08L3/06C08J5/18C08K5/053C08G18/76C08G18/66C08G18/42C08G18/34C08G18/10B65D65/46B65D65/42
CPCB65D65/42B65D65/466C08G18/10C08G18/348C08G18/4277C08G18/6659C08G18/7614C08J5/18C08J7/04C08J2403/06C08J2475/06C08K5/053Y02W90/10
Inventor 冯杰潘盛淇
Owner 施塔希(绍兴)新材料有限公司
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