Food-grade table cloth and preparation method thereof

Abstract

The invention discloses a food-grade table cloth and a preparation method thereof. The food-grade table cloth comprises the following raw materials in parts by weight: 40-60 parts of trioctyl trimellitate, 1-3 parts of calcium-zinc compound stabilizer, 0.5-2 parts of acrylic ester processing aid, 5-15 parts of calcium carbonate and 20-40 parts of anhydrous barium sulfate, relative to 100 parts of polyvinyl chloride resin. The food-grade table cloth disclosed by the invention can resist high temperature, resist precipitation, and resist solvent migration, and moreover does not contain phenolic substances such as phenol, nonyl phenol and octyl phenol, the PH value of the product can be 7.0; and since the product directly comes into contact with food, the environmental requirement is strict. By adopting the developed food-grade PVC table cloth, the environmental performance of the PVC product is greatly improved, the share of market of the PVC product in plastic products can be effectively improved, and the food-grade table cloth has significant social value and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a food-grade tablecloth and a preparation method thereof. Background technique [0002] With the development of the economy and the adjustment of the rural industrial structure, the market demand for plastic films in various industries in China continues to rise. [0003] The output of China's plastic film accounts for about 20% of the total output of plastic products, and it is one of the fastest growing categories of plastic products. Among them, polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), ethylene / vinyl acetate (EVA) are the most used. ), polyamide (PA) and other resins. The production methods in the plastic film industry include calendering and extrusion. The extrusion method is divided into extrusion film blowing, extrusion casting, extrusion stretching (also known as secondary m...

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Problems solved by technology

[0008] 1. The comprehensive migration detection data fluctuates greatly, and it is easy to exceed the limit value of the standard;

[0009] 2. The PH value of PVC food tablecloth is difficult to control;

[0010] 3. The food standard testing requirements of different countries are not the same, such as the German LFGB food standard and the US FDA food standard testing requirements are very different

[0012] 1. The impact of storage time, because PVC food tablecloths are formed by calendering of PVC, plasticizers, stabilizers and other raw materials, any products containing plasticizers will have a small amount of precipitation after long-term storage;

[0013] 2. The impact of ambient temperature. After the PVC food tablecloth is calendered and formed, it needs to be exported to foreign countries. During the transportation, the temperature of the container is relatively high, generally 60°C to 80°C. The higher the temperature, the more intense the irregular movement between the molecules, and the molecular The greater the force between them, the PVC food tablecloth film surface is easy to precipitate, thus affecting the overall migration test results;

[0014] 3. Most of the fillings of PVC products use calcium carbonate which is cheap, well-dispersed and less impurity as a filler, but food-grade tablecloths require a neutral PH value of 7.0, while the PH value of calcium carbonate is alkaline

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