Calcium sulfate modified ethylene-vinyl acetate copolymer and preparation method of calcium sulfate modified ethylene-vinyl acetate copolymer

Abstract

The invention relates to a calcium sulfate modified ethylene-vinyl acetate copolymer and a preparation method of the calcium sulfate modified ethylene-vinyl acetate copolymer. The calcium sulfate modified ethylene-vinyl acetate copolymer is prepared by the following raw materials according to parts by weight: 55-75 parts of ethylene-vinyl acetate copolymer, 10-30 parts of calcium sulfate and 10-30 parts of titanate coupling agents. The invention also comprises a preparation method of the calcium sulfate modified ethylene-vinyl acetate copolymer. The calcium sulfate modified ethylene-vinyl acetate copolymer has high tensile strength, is not easy to adsorb water, and has stable size, therefore, the calcium sulfate modified ethylene-vinyl acetate copolymer is particularly suitable for producing a transport packing material, a electronics shell, a life tool, a car instrument panel and the like.

Description

Technical field

[0001] The invention relates to an ethylene-vinyl acetate copolymer and a preparation method thereof, in particular to a calcium sulfate modified ethylene-vinyl acetate copolymer and a preparation method thereof. Background technique

[0002] Ethylene-vinyl acetate copolymer has good flexibility and elasticity, and can still have good flexibility at -50°C, good transparency and surface gloss, good chemical stability, good anti-aging and ozone resistance, no Toxicity, good blending with fillers, good coloring and processing and moldability, has been used in foam shoe materials, functional shed films, packaging films, hot melt adhesives, wires and cables, toys and other fields. However, the tensile strength of EVA resin does not meet the application requirements in some fields, and it is also easy to absorb water, which affects dimensional stability, which limits its application range. Summary of the invention

[0003] The technical problem to be solved by the prese...

Examples

Embodiment 1

[0017] The calcium sulfate modified ethylene-vinyl acetate copolymer of this embodiment is made of the following parts by weight of raw materials: 11Kg of ethylene-vinyl acetate copolymer, 6Kg of calcium sulfate, and 3Kg of titanate coupling agent.

[0018] Preparation:

[0019] (1) Surface modification of anhydrous calcium sulfate: dissolve the titanate coupling agent in 250ml of absolute ethanol, stir at 35°C for 6 hours, filter with suction, then wash and filter with suction 5 times until the impurities are removed; Add calcium sulfate and stir for 35 minutes, ultrasonic for 10 minutes, and then stir for 30 minutes; wash with absolute ethanol and filter 5 times with 200ml of absolute ethanol each time, and then dry in a vacuum box at 50°C for 24 hours. Dry anhydrous calcium sulfate.

[0020] (2) Add ethylene-vinyl acetate copolymer to tetrahydrofuran, the weight ratio of ethylene-vinyl acetate copolymer to tetrahydrofuran is 1:1, stir in a constant temperature bath at 55°C for 60...

Embodiment 2

[0026] The calcium sulfate modified ethylene-vinyl acetate copolymer in this embodiment is made of the following parts by weight of raw materials: ethylene-vinyl acetate copolymer 13Kg, calcium sulfate 3Kg, and titanate coupling agent 4Kg.

[0027] Preparation:

[0028] (1) Surface modification of anhydrous calcium sulfate: Dissolve the titanate coupling agent in 300ml of absolute ethanol, stir at 40°C for 6 hours, filter with suction, wash and filter with suction 5 times until the impurities are removed; Add calcium sulfate, and stir for 35 minutes, ultrasonic for 10 minutes, and then stir for 30 minutes; wash with absolute ethanol and filter with suction 5 times, each time with 200ml of absolute ethanol, and then dry in a vacuum box at 50℃ for 24 hours. Dry anhydrous calcium sulfate.

[0029] (2) Add ethylene-vinyl acetate copolymer to tetrahydrofuran, the weight ratio of ethylene-vinyl acetate copolymer to tetrahydrofuran is 1:1, stir in a constant temperature bath at 55°C for 65...

Embodiment 3

[0035] The calcium sulfate modified ethylene-vinyl acetate copolymer of this embodiment is made of the following parts by weight of raw materials: 15Kg of ethylene-vinyl acetate copolymer, 3Kg of calcium sulfate, and 3Kg of titanate coupling agent.

[0036] Preparation:

[0037] (1) Surface modification of anhydrous calcium sulfate: dissolve the titanate coupling agent in 250ml of absolute ethanol, stir at 40°C for 6 hours, filter with suction, then wash and filter with suction 5 times until the impurities are removed; Add calcium sulfate and stir for 35 minutes, ultrasonic for 10 minutes, and then stir for 30 minutes; wash with absolute ethanol and filter 5 times with 200ml absolute ethanol each time, and then dry in a vacuum box at 50°C for 24 hours. Obtain dry anhydrous calcium sulfate.

[0038] (2) Add ethylene-vinyl acetate copolymer to tetrahydrofuran, the weight ratio of ethylene-vinyl acetate copolymer to tetrahydrofuran is 1:1, stir in a constant temperature bath at 55°C fo...

Technical field

[0001] The invention relates to an ethylene-vinyl acetate copolymer and a preparation method thereof, in particular to a calcium sulfate modified ethylene-vinyl acetate copolymer and a preparation method thereof. Background technique

[0002] Ethylene-vinyl acetate copolymer has good flexibility and elasticity, and can still have good flexibility at -50°C, good transparency and surface gloss, good chemical stability, good anti-aging and ozone resistance, no Toxicity, good blending with fillers, good coloring and processing and moldability, has been used in foam shoe materials, functional shed films, packaging films, hot melt adhesives, wires and cables, toys and other fields. However, the tensile strength of EVA resin does not meet the application requirements in some fields, and it is also easy to absorb water, which affects dimensional stability, which limits its application range. Summary of the invention

[0003] The technical problem to be solved by the prese...

Examples

Embodiment 1

[0017] The calcium sulfate modified ethylene-vinyl acetate copolymer of this embodiment is made of the following parts by weight of raw materials: 11Kg of ethylene-vinyl acetate copolymer, 6Kg of calcium sulfate, and 3Kg of titanate coupling agent.

[0018] Preparation:

[0019] (1) Surface modification of anhydrous calcium sulfate: dissolve the titanate coupling agent in 250ml of absolute ethanol, stir at 35°C for 6 hours, filter with suction, then wash and filter with suction 5 times until the impurities are removed; Add calcium sulfate and stir for 35 minutes, ultrasonic for 10 minutes, and then stir for 30 minutes; wash with absolute ethanol and filter 5 times with 200ml of absolute ethanol each time, and then dry in a vacuum box at 50°C for 24 hours. Dry anhydrous calcium sulfate.

[0020] (2) Add ethylene-vinyl acetate copolymer to tetrahydrofuran, the weight ratio of ethylene-vinyl acetate copolymer to tetrahydrofuran is 1:1, stir in a constant temperature bath at 55°C for 60...

Embodiment 2

[0026] The calcium sulfate modified ethylene-vinyl acetate copolymer in this embodiment is made of the following parts by weight of raw materials: ethylene-vinyl acetate copolymer 13Kg, calcium sulfate 3Kg, and titanate coupling agent 4Kg.

[0027] Preparation:

[0028] (1) Surface modification of anhydrous calcium sulfate: Dissolve the titanate coupling agent in 300ml of absolute ethanol, stir at 40°C for 6 hours, filter with suction, wash and filter with suction 5 times until the impurities are removed; Add calcium sulfate, and stir for 35 minutes, ultrasonic for 10 minutes, and then stir for 30 minutes; wash with absolute ethanol and filter with suction 5 times, each time with 200ml of absolute ethanol, and then dry in a vacuum box at 50℃ for 24 hours. Dry anhydrous calcium sulfate.

[0029] (2) Add ethylene-vinyl acetate copolymer to tetrahydrofuran, the weight ratio of ethylene-vinyl acetate copolymer to tetrahydrofuran is 1:1, stir in a constant temperature bath at 55°C for 65...

Embodiment 3

[0035] The calcium sulfate modified ethylene-vinyl acetate copolymer of this embodiment is made of the following parts by weight of raw materials: 15Kg of ethylene-vinyl acetate copolymer, 3Kg of calcium sulfate, and 3Kg of titanate coupling agent.

[0036] Preparation:

[0037] (1) Surface modification of anhydrous calcium sulfate: dissolve the titanate coupling agent in 250ml of absolute ethanol, stir at 40°C for 6 hours, filter with suction, then wash and filter with suction 5 times until the impurities are removed; Add calcium sulfate and stir for 35 minutes, ultrasonic for 10 minutes, and then stir for 30 minutes; wash with absolute ethanol and filter 5 times with 200ml absolute ethanol each time, and then dry in a vacuum box at 50°C for 24 hours. Obtain dry anhydrous calcium sulfate.

[0038] (2) Add ethylene-vinyl acetate copolymer to tetrahydrofuran, the weight ratio of ethylene-vinyl acetate copolymer to tetrahydrofuran is 1:1, stir in a constant temperature bath at 55°C fo...