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Special coating resin combination for polypropylene heavy-load packaging bag and preparation method thereof

A technology for coating resin and polypropylene homopolymer, which is applied to flexible coverings, packaging, wrapping paper, etc., can solve the problems of large fluctuations in melt flow rate, failure to meet environmental protection requirements, and low peeling strength of coating films. Small difference in peel strength, excellent rheological properties during processing, and weak film orientation

Inactive Publication Date: 2008-04-16
中国蓝星(集团)总公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melt flow rate produced by these methods fluctuates greatly, the coating process is unstable, and the peeling strength of the coating film is low, which cannot meet the increasingly stringent environmental protection requirements.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Get composition 1000g, wherein: homopolypropylene 900g, melt flow rate is 2.8g / 10min; Low density polyethylene (LDPE) 60g; Petroleum resin 10g; Calcium carbonate 27.7g; Hindered phenolic antioxidant 1g; 1.3g,.

[0024] Add the weighed combined material into a high-speed mixer and mix for 5 minutes to form a homogeneous mixture. Then, feed the mixture into a twin-screw extruder, knead and extrude it into strips, and then cut into pellets by a pelletizer to make a special coating resin composition for polypropylene heavy-duty container bags. The processing technology is: the temperature of the first zone of the twin-screw extruder is 170°C, the temperature of the second zone is 175°C, the temperature of the third zone is 185°C, the temperature of the fourth zone is 190°C, the temperature of the fifth zone is 195°C, the temperature of the sixth zone is 200°C, and the temperature of the seventh zone is 200°C °C, the temperature in the eighth zone is 200 °C; the screw speed...

Embodiment 2

[0027] Take 1000g of the composition, including: 890g of homopolypropylene; 60g of low-density polyethylene (LDPE); 20g of petroleum resin; 27.7g of calcium carbonate; 1g of antioxidant; 1.3g of degradation agent.

[0028]Add the weighed combined material into a high-speed mixer and mix for 5 minutes to form a homogeneous mixture. Then, feed the mixture into a twin-screw extruder, knead and extrude it into strips, and then cut into pellets by a pelletizer to make a special coating resin composition for polypropylene heavy-duty container bags. The processing technology is: the temperature of the first zone of the twin-screw extruder is 170°C, the temperature of the second zone is 175°C, the temperature of the third zone is 185°C, the temperature of the fourth zone is 190°C, the temperature of the fifth zone is 195°C, the temperature of the sixth zone is 200°C, and the temperature of the seventh zone is 200°C ℃, the temperature in the eighth zone is 200 ℃; the screw speed is 220...

specific Embodiment approach 3

[0030] Take 1000g of the composition, including: 885g of homopolypropylene; 60g of low-density polyethylene (LDPE); 25g of petroleum resin; 27.7g of calcium carbonate; 1g of antioxidant; 1.3g of degradation agent.

[0031] Add the weighed combined material into a high-speed mixer and mix for 4 minutes to form a homogeneous mixture. Then, feed the mixture into a twin-screw extruder, knead and extrude it into strips, and then cut into pellets by a pelletizer to make a special coating resin composition for polypropylene heavy-duty container bags. The processing technology is: the temperature of the first zone of the twin-screw extruder is 170°C, the temperature of the second zone is 175°C, the temperature of the third zone is 185°C, the temperature of the fourth zone is 190°C, the temperature of the fifth zone is 195°C, the temperature of the sixth zone is 200°C, and the temperature of the seventh zone is 200°C °C, the temperature in the eighth zone is 200 °C; the screw speed is ...

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Abstract

The invention discloses a special coating resin composite for polypropylene heavy load container bag. The composite comprises the following components: polypropylene homopolymer 84.5-94.1 percent, low density polyethylene 4.7-8.4 mass percent, petroleum resin 1-2.5 mass percent, inorganic filler 0-4.2 mass percent, antioxidant 0.05-0.25 mass percent, and degradation agent 0.1-0.17mass percent. The components prepared according to the ratio are mixed in a high speed mixer and then are added into a parallel concurrent twin screw extruder for milling and granulating, and finally the composite of the invention is obtained. The coating resin composite provided by the invention has excellent processing rheologic behavior, melt flow rate being stabilized from 25g / 10min to 32g / 10min, and even painting. The composite also has a good property of bonding with basis material acrylic, peel strengths both in longitudinal and latitudinal directions of over 3.5N, a low filming orientation, and little difference between peel strengths in longitudinal and latitudinal directions. The composite of the invention has simple preparation method, easily controlled process and low manufacture cost.

Description

technical field [0001] The invention relates to a coating resin composition, in particular to a special coating resin composition for polypropylene heavy-duty container bags, and also relates to a preparation method of the coating composition. Background technique [0002] Polypropylene is one of the five major thermoplastic resins. Due to its rich source of raw materials, relatively simple production process, good mechanical properties, processing properties and optical properties, it is one of the fastest growing materials in recent years. Polypropylene has excellent film-forming and fiber-forming properties, and has been widely used in the packaging field. Hundreds of thousands of tons of polypropylene are consumed every year in the woven bag industry alone, and the container bags used in the heavy-duty container field are also occupy a considerable share. With the improvement of production efficiency and the enhancement of people's awareness of environmental protection...

Claims

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Application Information

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IPC IPC(8): C09D123/12B65D65/42C09D123/06C09D157/02
Inventor 杨军忠李瑞亢胡衍平
Owner 中国蓝星(集团)总公司
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