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Nano-modified polypropylene soft packaging material

A polypropylene resin and modification technology, which is applied in the field of nano-modified polypropylene flexible packaging materials, can solve the problems of high surface resistance of PP films, excessive organic solvents, poor ink adhesion, etc., and achieve no food safety hazards and composite performance Improvement and surface resistance reduction effect

Active Publication Date: 2011-04-20
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polypropylene mainly has the following disadvantages: low polarity, poor adhesion with ink; low peel strength of the prepared composite film, easy to foam and even detachment; CPP (cast polypropylene film) and aluminized layer VMCPP (vacuum aluminized CPP) is prone to aluminum plating transfer; the organic solvent in the printing ink or adhesive is difficult to desorb, and the residual organic solvent in the packaging material after printing is easy to exceed the standard; the friction coefficient of the film material is too high Large, unable to meet the requirements of automatic packaging production lines; PP film has a large surface resistance, which is prone to static electricity, and general flexible packaging workshops will contain a certain concentration of organic solvents, which will bring safety hazards to production, etc.
For example, in order to increase the polarity of the PP film and improve the adhesion, corona treatment is performed on the film; in order to reduce the friction coefficient of the film, a slip agent is added to the PP resin; in order to reduce the surface resistance of the film, an antistatic agent is added to the PP resin However, there has been no better solution to the problem of excessive organic solvents in BOPP (biaxially oriented polypropylene film) after printing
[0004] It can be seen from the modification process of the current PP film mentioned above that in order to improve the printing and composite performance of the PP film, people have adopted a variety of processes, including adding a variety of small molecule additives (slippery agents, antistatic agents, etc.) etc.), but these small molecular chemical substances may migrate into the packaged food, bringing hidden dangers to food safety

Method used

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  • Nano-modified polypropylene soft packaging material
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  • Nano-modified polypropylene soft packaging material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0077] 1.1.1 Preparation of nano-silica (model NS-2):

[0078] Adding 120 grams of EVA emulsion with a solid content of 50% in a 500-milliliter four-necked bottle equipped with an electric stirrer, a thermometer, and a dropping funnel, the temperature of the system is controlled at 40° C. Add 30 grams of water glass (the Baume degree is 40 ° Be, the modulus is 3.5) dropwise from the dropping funnel within 30 minutes to the above-mentioned system, and mix for 1 hour. Add 10% (v%) sulfuric acid aqueous solution dropwise into the system from the dropping funnel until the system pH=4, and continue stirring for 1 hour. Pour the precipitate into 1 liter of distilled water, wash the precipitate, then let it stand still, pour off the supernatant; then add distilled water, stir for 10 minutes, let it stand, pour off the supernatant again, until it is washed without sulfate radicals ion. The slurry obtained is ground with a colloid mill, then spray-dried and pulverized to obtain EVA-m...

Embodiment 1～4

[0090] Examples 1-4: Preparation of modified PP resin samples

[0091] Blend polypropylene resin with NS-3 type nano-silica modifier, antioxidant 1010, antioxidant 168 and calcium stearate (referred to as CaSt) in proportion (see Table 1) in a high-speed mixer 5 minutes. Wherein Comparative Example 1 did not add nano-silica, and Examples 1-4 added NS-3 type nano-silica at 0.5 wt %, 1.0 wt %, 3.0 wt % and 5.0 wt %, respectively.

[0092] Table 1 Composition of modified and unmodified PP

[0093]

[0094] After mixing the above-mentioned raw materials, the nano-modified PP resin was obtained by melt co-extrusion on a twin-screw extruder, and the temperature control of the extruder was shown in Table 2.

[0095] Table 2 Melt extrusion temperature of modified and unmodified PP

[0096]

[0097] Using a plastic injection molding machine, the modified PP samples and the unmodified PP resin samples were injected to make samples; or a flat vulcanizer was used to make samples ...

Embodiment 1

[0116] Example 1 is the modified PP when the addition amount of NS-3 type nano-silica is 0.5wt%. Compared with the sample of Comparative Example 1, its toughness is greatly improved, and the tensile strength is similar. The elongation at break increased by nearly 4 times, the Young's modulus and fracture stress increased by 7% and 30%, respectively, and the tensile yield stress was almost unchanged; the melting temperature increased by nearly 3 °C, and the melting enthalpy (crystallinity) increased by 38%. %; the contact angle with water is reduced by 8°; due to the improvement of the polarity of the sample in Example 1, its ink adhesion is increased by 55%, and the peel strength with the pressure-sensitive tape is increased by 14%; the dynamic friction coefficient is reduced by 15%, and the static friction coefficient The change is not obvious; the toluene residue is reduced by 91%; the surface resistance is reduced by 36%. It shows that when the nano-silica modified PP, when...

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Abstract

The invention provides a packaging polyolefin processing agent composition which is a mixture of nano silicon dioxide and ethylene-vinyl acetate copolymer, wherein the mass of the nano silicon dioxide accounts for 10-40% of the total mass of the processing agent composition, and the mass of the ethylene-vinyl acetate copolymer accounts for 60-90% of the total mass of the processing agent composition. The invention also provides packaging polyolefin modified by the processing agent composition. The modification of the nano silicon dioxide has greater influences on the mechanical property, the crystallization property, the polarity, the printing property, the composite property, the residue of organic solvent, and other indexes of the polypropylene. A result shows that after the polypropylene soft packaging material is subjected to nano modification, the toughness of the polypropylene soft packaging material is greatly enhanced; meanwhile, the polarity, the printing ink adhesive force and the peel strength of the material are improved; the adsorption of the modified polypropylene on toluene is greatly reduced. After nano modification, the using performance of the polypropylene used as the soft packaging material can be greatly improved.

Description

technical field [0001] The invention relates to a nano-processing aid composition of polyolefin for packaging and a polyolefin material modified by nano-auxiliaries, especially polypropylene materials, in particular to a nano-processing aid composition of polyolefin for packaging and a nano-processing aid composition for packaging Auxiliary modified polypropylene, its preparation method and use, especially relates to a nano-processing aid composition of polyolefin for food flexible packaging and polypropylene modified by nano-auxiliary for food flexible packaging, and its preparation method and use. Background technique [0002] As a flexible packaging material, the amount of polypropylene (PP) film is second only to polyethylene, accounting for about 30% of the composite flexible packaging material. However, polypropylene mainly has the following shortcomings: low polarity, poor adhesion to ink; low peel strength of the prepared composite film, easy to foam or even delamina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/00C08L23/12C08L23/06C08L23/08C08K9/04C08K3/36
Inventor 许文才李东立付亚波刘全校罗世永
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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