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A kind of modified polypropylene hot melt adhesive and preparation method thereof

A technology of polypropylene and hot-melt adhesives, applied in the direction of adhesives, grafted polymer adhesives, adhesive types, etc., can solve the problem of fast cooling and crystallization of modified polypropylene, affecting the bonding strength of multi-layer barrier materials, Problems such as high melt index of polypropylene, to achieve the effect of increasing molecular weight, improving processing performance and increasing mechanical strength

Active Publication Date: 2022-03-11
GUANGZHOU LUSHAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned patents have the following disadvantages: First, the melt index of maleic anhydride functionalized modified polypropylene as a key component is relatively high, indicating that its degradation is severe and its molecular weight is low, which will affect the adhesion of the obtained multilayer barrier material strength
Secondly, the modified polypropylene prepared by the above-mentioned patent has a fast cooling crystallization speed and high crystallinity. Once crystallized, it loses its bonding ability, which cannot meet the requirements of rapid bonding of hot melt adhesives under low temperature conditions in the process of producing multi-layer barrier materials. Meet the requirements

Method used

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  • A kind of modified polypropylene hot melt adhesive and preparation method thereof
  • A kind of modified polypropylene hot melt adhesive and preparation method thereof
  • A kind of modified polypropylene hot melt adhesive and preparation method thereof

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preparation example Construction

[0047] The preparation method of above-mentioned modified polypropylene hot-melt adhesive comprises the following steps:

[0048] Steps for preparing functionalized modified polypropylene: Mix the second random copolymerized polypropylene and the second ethylene-α-olefin copolymer uniformly, put them into a screw extruder, and the temperature of the mixing zone of the screw extruder is 130-200 °C, the temperature in the reaction zone is 150-230 °C, and the temperature in the termination zone is 150-220 °C; then add polar monomers, initiators, and modification additives, extrude and granulate, and obtain functionalized modified polypropylene;

[0049] The step of preparing the modified polypropylene hot melt adhesive: the functionalized modified polypropylene obtained in the step of preparing the functionalized modified polypropylene, the first random copolymerized polypropylene, the first ethylene-α-olefin copolymer and the antioxidant Put the agent into a screw extruder for m...

Embodiment 1

[0052] A preparation method of modified polypropylene hot-melt adhesive, is characterized in that, comprises the following steps:

[0053] The step of preparing functionalized modified polypropylene: the density of 80 parts is 0.90g / cm 3 , the second random copolymerized polypropylene with a melt index of 8g / 10min (230°C, 2.16kg) and 20 parts with a density of 0.88g / cm 3 The second ethylene-α-olefin copolymer with a melt index of 2g / 10min (190°C, 2.16kg) was added to the mixer, mixed for 5min, and the stirring speed was 1000r / min; then the uniformly stirred material was put into a φ65 twin-screw extruder In the extruder, the length-to-diameter ratio of the screw is 36:1, the temperature of the three reaction zones of the twin-screw extruder is 180°C, and the screw speed is 300 rpm. Add 2 parts of maleic anhydride, 0.3 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and 1 part of styrene to the mixing zone of the extruder, and extrude to granulate. A functionalized modi...

Embodiment 2

[0058] A preparation method of modified polypropylene hot-melt adhesive, is characterized in that, comprises the following steps:

[0059] The step of preparing functionalized modified polypropylene: the density of 40 parts is 0.91g / cm 3 , the second random copolymerized polypropylene with a melt index of 2.5g / 10min (230°C, 2.16kg) and 60 parts with a density of 0.89g / cm 3 The second ethylene-α-olefin copolymer with a melt index of 8g / 10min (190°C, 2.16kg) was added to the mixer, mixed for 5min, and the stirring speed was 1000r / min; then the uniformly stirred material was put into a φ65 twin-screw extruder In the extruder, the length-to-diameter ratio of the screw is 36:1, the temperature of the three reaction zones of the twin-screw extruder is 190°C, and the screw speed is 250rpm. In the mixing zone of the extruder, 1 part of maleic acid, 0.1 part of tert-butylcumyl peroxide, and 0.5 part of p-methylstyrene were added by weighing, extruded and granulated to obtain functiona...

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Abstract

The invention discloses a modified polypropylene hot-melt adhesive, which is prepared from the following components in parts by weight: 5-30 parts of functionalized modified polypropylene; 50-90 parts of a first random copolymerized polypropylene; a first 5-20 parts of ethylene-α-olefin copolymer; 0.05-0.5 part of antioxidant. The invention also discloses a preparation method of the above-mentioned modified polypropylene hot-melt adhesive. The modified polypropylene hot-melt adhesive of the invention has high bonding strength; especially under low temperature conditions, it can bond quickly and has strong bonding force, and can also help to reduce production cost and improve production efficiency.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a modified polypropylene hot melt adhesive and a preparation method thereof. Background technique [0002] Multi-layer barrier materials are widely used in the outer packaging of fast-moving food, pharmaceutical products, etc., which play the role of blocking moisture and gas, and can effectively extend the shelf life and shelf life of products. At present, the most used and widely used multi-layer barrier materials are made of polyethylene, polypropylene, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, vinylidene chloride copolymer, nylon, polyester and other resins. Polyolefin materials such as polyethylene and polypropylene have good water resistance and processability, but poor gas barrier properties; ethylene-vinyl alcohol copolymers, vinylidene chloride copolymers, nylon and other materials have good gas barrier properties. performance, but poor water resistance; th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J123/14C09J151/06C09J123/08
Inventor 汪加胜刘嘉贤唐舫成李煦田
Owner GUANGZHOU LUSHAN NEW MATERIALS
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