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Polypropylene composition for transparent high temperature boiling film and preparation method thereof

A polypropylene composition and high-temperature cooking technology, which is applied in the field of polypropylene composition for transparent high-temperature cooking film and its preparation, can solve the problems of food contamination, low transparency, poor hygienic processing performance, etc., and achieve good impact resistance , high surface gloss, high heat resistance

Active Publication Date: 2018-01-12
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the aluminum-plastic composite film has the characteristics of shading and preventing aroma from escaping, but at the same time, the aluminum-plastic composite film has shortcomings such as opacity, poor folding resistance, invisible food inside, and cannot be processed by microwaves. It is gradually being eliminated. The national standard GB / Composite film with aluminum foil structure has also been deleted in T10004-2008
The existing transparent retort-resistant composite film is usually a composite film composed of non-polyolefin materials and polypropylene or polyethylene. These commonly used non-polyolefin materials include polyester, nylon (PA), polyvinylidene chloride (PVDC), polyethylene Alcohol (PVA), ethylene-vinyl alcohol copolymer (EVOH), etc. Although some of these materials have good barrier properties, their cooking resistance is poor, such as PVA and EVOH; PVDC has good barrier properties and cooking resistance. However, its hygienic processing performance is poor, and it is easy to cause food pollution when used in food packaging materials.
PA has good mechanical properties, transparency, oxygen barrier properties, high-temperature cooking performance and hygiene safety, etc., but PA is very easy to absorb water, and the performance of the composite film will decrease after absorbing water.
[0005] In the prior art, the polypropylene used for the cooking film is mostly a propylene-ethylene binary random copolymer, and there is a lack of polypropylene materials with good transparency, impact resistance and high heat resistance.
Due to the limitation of heat resistance and impact performance, binary random copolymerized polypropylene can only be used for ordinary cooking film or semi-high temperature cooking film; while the blended modified polypropylene composition often has poor compatibility, inhomogeneous performance, and transparency. Problems such as low reliability and high cost
[0008] Chinese patent CN 102229269 A introduces a transparent retort-resistant film. The raw materials of the transparent retort-resistant film involved in this patent are random copolymerized polypropylene, adhesive resin and polyamide, and the transparent retort-resistant film is obtained through a co-extrusion molding process. The obtained transparent retort-resistant film can withstand the retort test at 121°C, but the breakage rate of the composite film is greatly affected by the ratio between the adhesive resin and polypropylene
The retort film involved in this patent is used for retort sterilization at 121°C for 30 minutes, without mentioning properties such as transparency

Method used

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  • Polypropylene composition for transparent high temperature boiling film and preparation method thereof
  • Polypropylene composition for transparent high temperature boiling film and preparation method thereof
  • Polypropylene composition for transparent high temperature boiling film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1-3

[0045] The preparation method of impact copolymer polypropylene resin in embodiment 1-3:

[0046] Using propylene and ethylene monomers as raw materials, using Ziegler-Natta type titanium series catalyst as the main catalyst, the co-catalyst includes triethylaluminum (TEAL) and electron donor (C-DONOR), in double-loop reactor and gas phase The process equipment combined with fluidized bed reactor is prepared from above, in which the polymerization reaction of homopolypropylene is carried out in the loop reactor stage, the polymerization temperature is 69-71 ℃, the pressure of the loop reactor is 3.3-4.0MPa, and the reaction is in the gas phase The propylene and ethylene monomers are fed into the reactor stage simultaneously for gas-phase copolymerization, and the polymerization temperature is 75-78°C. During the reaction process of the polymerization process, by controlling the C ＝ 2 / (C ＝ 2 +C ＝ 3 )(V / V) at 0.08-0.18 and H 2 / C ＝ 2 (V / V) in the range of 0.25-0.45, re...

Embodiment 1

[0048] Preparation steps of polypropylene composition for transparent high-temperature cooking film:

[0049] The calcium stearate of 0.1 part, the calcium stearate of 0.04 part, the glycerol monostearate that will add 0.1 part of antioxidant 1010, 0.1 part of antioxidant 168, 0.04 part, 0.03 part of glycerol monostearate in the impact copolymerized polypropylene resin powder, its composition The addition amount of nucleating agent and antisticking agent is shown in Table 1, and all kinds of raw materials are commercially available products.

[0050] Put the polypropylene powder and various additives in a high-speed mixer, stir for 3 minutes at a speed of 1500r / min, and mix the obtained premix evenly; then add the obtained premix to the co-rotating twin-screw extruder Medium-melt mixing, the temperature of the highest section of the extruder is 210°C, the main engine speed of the extruder is 200r / min, the feeding speed is 40r / min, extruded and granulated to obtain a transparen...

Embodiment 2-3

[0055] The addition amount of antioxidant, acid absorbing agent and antistatic agent in embodiment 2-3 is the same as that of embodiment 1, and its raw material consumption is shown in table 1. Its performance test sample and film preparation steps are all the same as in Example 1.

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Abstract

The invention relates to a polypropylene composition for a transparent high temperature boiling film and a preparation method thereof. The polypropylene composition is prepared from following raw materials: impact resistant co-polypropylene resin, an antioxidant, an acid absorbent, an antistatic agent, a nucleating agent, an anti-adhesion agent, and a slipping agent. The obtained polypropylene composition has the advantages of low haze, excellent transparency, good impact resistant performance, high heatproof property, and high surface glossiness, and can be made into a highly transparent filmresistant to high temperature boiling. The haze of a cast film with a thickness of 36 [mu]m is only 0.52%. At the same time, compared with those of a film prepared from common random co-polypropylene, the tensile strength, fracture / tensile strain, and tear resistant performance of prepared film are better. The prepared transparent high temperature boiling film is mainly used in the food package field.

Description

technical field [0001] The invention relates to a polypropylene composition for film, more specifically to a polypropylene composition for transparent high-temperature cooking film and a preparation method thereof. Background technique [0002] Cast polypropylene film (CPP) has the advantages of good transparency, high gloss, strong moisture resistance, high heat resistance, easy heat sealing, etc., and has good packaging machinery applicability, so it is widely used, especially in food Packaging is the main thing. According to the application, it can be divided into three categories: composite film, aluminized film, and cooking film. In recent years, with the acceleration of the pace of modern life and the rapid development of the tourism industry, the demand for retort films used in the packaging of cooked foods such as meat and soy products is increasing. [0003] Retort film is divided into ordinary retort film (also known as semi-high temperature retort grade) and hig...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/16C08K13/02C08K5/00C08K5/134C08K5/526C08K5/098C08K3/36C08F110/06C08F210/06C08F210/16C08F4/646B29C47/92B29C48/92
Inventor 李延亮李丽蒋善君唐岩陈智能苑东兴卢昶裴小静王秀丽明月陈华赉黄峰
Owner CHINA PETROLEUM & CHEM CORP
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