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Heat-sealing material for polypropylene as well as preparation method and application of heat-sealing material

A polypropylene and copolymerized polypropylene technology, which is applied in the field of compositions based on propylene copolymers, can solve the problems of ultra-low temperature heat-sealing materials sticking to rollers, lowering the material heat-sealing temperature, and easily sticking to rollers, etc. The effect of low sealing temperature, wide heat sealing temperature range and high transparency

Pending Publication Date: 2022-07-05
温州市金田塑业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The comonomer introduced in the traditional multi-component copolymerization process has a certain bottleneck in reducing the heat sealing temperature of the material, which cannot fully meet the market demand
[0010] On the other hand, ultra-low temperature heat-sealing materials produce sticking phenomenon during film processing
The introduction of low molecular weight components by blending is very easy to stick to the roll and cannot be produced, and the low molecular weight components are very easy to damage the smooth surface of the product, affect the gloss, and cause serious product defects

Method used

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  • Heat-sealing material for polypropylene as well as preparation method and application of heat-sealing material
  • Heat-sealing material for polypropylene as well as preparation method and application of heat-sealing material
  • Heat-sealing material for polypropylene as well as preparation method and application of heat-sealing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Synthesis of polyglycerol fatty acid ester

[0043] 100 parts by mass of rapeseed oil and 25 parts by mass of methanol were reacted with 4 parts by mass of sodium hydroxide for methyl esterification at 70 °C for 4 h, methanol was distilled off at 120 °C, and the upper fatty acid methyl ester was separated, and the lower layer of glycerol continued to Under alkali catalysis, the polymerization was carried out at 210 °C for 10 h, during which the water was discharged through nitrogen to obtain a polyglycerol intermediate, 40 parts by mass of fatty acid methyl esters were added, and further heated to 180 °C, stirred and polymerized for 16 h, and then decompressed (180 °C, 1.33KPa). ) distillation for 5h to obtain polyglycerol fatty acid ester.

[0044] (2) Preparation of heat sealing material

[0045] 60 parts by weight of ethylene propylene butene terpolymer polypropylene (KS350, INEOS, MI 5.0, 131°C), 25 parts by weight of polyglycerol fatty acid ester, 5 parts by w...

Embodiment 2

[0051] The method is the same as that of Example 1, except that different bio-oils are selected for the reaction, as shown in Table 1.

[0052] Table 1: Effects of different bio-oils on the properties of heat-sealing materials

[0053]

[0054] The experimental results in Table 1 above show that: when the preparation method of the present application is used to prepare the heat-sealing material, the bio-oil selected in Table 1 can be obtained under the synthesis conditions provided in this case. The polyglycerol fatty acid ester of hydroxyl group and ester group has a good heat sealing effect on the heat sealing material. 65~70℃, the hot tack strength is kept at 14~16N / 15min; the light transmittance is kept at 93~94%. However, the number of double bonds in the tung oil used in the No. 2-6 scheme is large, and it is easy to form a highly cross-linked asphaltene component during the polymerization process, which cannot be entangled with the polypropylene chain. The waste oil...

Embodiment 3

[0064] The method is the same as in Example 1, except that different elastomers are selected for the reaction, as shown in Table 2.

[0065] Table 2: Effects of Different Elastomers on the Properties of Heat Sealing Materials

[0066]

[0067] It can be seen in combination with Table 2: when the preparation method of the present application is used to prepare the heat-sealing material, the selected elastomer has an active component aliphatic chain in its structure and the molecular weight of the copolymer is entangled, giving the heat-sealing material a lower The heat-sealing temperature (65-75℃) and wide temperature range (span about 60-70℃), and the hot-stick strength is basically maintained at 15-17N / 15min, and the light transmittance is also maintained at 93-94%. Compared with Example 1, the elastomer of this example has certain polar components, which can effectively improve the thermal adhesion efficiency of the material. Molecules with too high fluidity (No. 3-6, 3-...

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Abstract

The invention provides a heat-sealing material for polypropylene as well as a preparation method and application of the heat-sealing material, and belongs to the technical field of compositions taking propylene copolymers as base materials. The composite material is prepared from co-polypropylene, polyglycerol fatty acid ester, low-density polyethylene, an elastomer, a vulcanizing agent and an antioxidant through vulcanization, extrusion and granulation. The heat-sealing material is used for a biaxially oriented polypropylene film, a heat-shrinkable polypropylene film and a polypropylene cast film, and has the advantages of low heat-sealing temperature, wide temperature range, high heat bonding strength, good light transmission, good impurity inclusiveness and the like.

Description

technical field [0001] The application relates to a heat-sealing material for polypropylene, a preparation method and application thereof, and belongs to the technical field of compositions based on propylene copolymers. Background technique [0002] Polypropylene film is an important product in the field of packaging. It has the advantages of light weight, transparency, non-toxicity, moisture resistance and high mechanical strength. It is widely used in the packaging of food, medicine, cigarettes and other products, and is widely used as a substrate for composite films. When the ordinary BOPP (biaxially oriented polypropylene film) is heated, the molecules are de-oriented and the molecular chains shrink, which makes the vicinity of the heated area thin and fractured. It does not have heat sealing performance and cannot be used as a film heat sealing layer. BOPP and heat sealing are required. The layers are laminated to form a heat-sealable packaging film. [0003] The heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L67/08C08L23/08C08L23/16C08L23/22C08K5/134C08K5/14C08K5/23C08K5/13C08K5/1545C08K5/18C08K5/25B32B27/32B32B27/06
CPCC08L23/14B32B27/32B32B27/08C08L2201/06C08L2201/10C08L2203/162B32B2307/31B32B2307/412B32B2439/70B32B2439/80C08L67/08C08L23/0815C08K5/1345C08K5/14C08L23/16C08L23/0853C08L23/22C08L23/0876C08K5/23C08K5/13C08K5/1545C08K5/18C08K5/25
Inventor 方晨方文彬徐董刘正训郑国星薛圣光张庆王海伟方鑫鑫
Owner 温州市金田塑业有限公司
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