CN102242533A - Method for preparing grease resistant food wrapping paper - Google Patents

Abstract

The invention discloses a preparation method of grease-resistant food packaging paper. The preparation method comprises the following steps: preparation of grease-resistant coating, vacuum degassing, coating at 2-10g/ ^m2 and drying at 60-110°C. In the anti-grease coating crude material, the weight percentage of chitosan is controlled at 0.5% to 10%, and in the prepared anti-grease coating crude product, the weight percentage of chitosan is 0.5% to 10%, The volume percentage of acetic acid is 0.5% to 10%; the weight percentage of sodium alginate is 0.1% to 10%; the oil resistance food wrapping paper obtained by the method of the present invention has an oil resistance value of 8 to 11. The grease-resistant food wrapping paper obtained by the method has the advantages of low cost, environmental protection, good oil and water resistance, non-toxicity and the like.

Description

A kind of preparation method of anti-grease food wrapping paper

technical field

The invention discloses a preparation method of oil-resistant food wrapping paper, which belongs to the technical field of coating wrapping paper preparation.

Background technique

In the field of food packaging, especially for the packaging of some oily items, most manufacturers tend to use plastics as raw materials. However, in the process of garbage disposal, plastics are difficult to decompose after being landfilled, and toxic gases are released after incineration. The development of degradable plastics has become the focus of current scientific and technological research. However, due to material and technical problems, the current degradable plastics still cannot be completely degraded, and the cost is high, so they have not yet been put into large-scale production and use.

At present, there are degradable food packaging films made of natural biological materials such as soybean protein for oily food packaging, but edible packaging is not widely used commercially and cannot replace synthetic polymer plastic films. The mechanical properties are poor, and the natural edible polymer material itself is hydrophilic, and its moisture resistance is limited. At the same time, the problems of its packaging heat sealability and printability have yet to be resolved.

The oil-proof food packaging paper announced by Chinese patent 201495453U includes a face paper layer, a back paper layer, and a three-layer core paper layer, and a waterproof film layer and an oil-proof film layer are pressed between the core layers, and the face paper layer and the back paper layer are covered. There is a sizing agent layer. The patent whose publication number is CN201201764X provides a kind of oil-proof cardboard for food packaging. The oil-proof cardboard is composed of a surface coating layer, a lining layer, a core layer, a bottom layer and an oil-proof layer, and the oil-proof layer is a fluorine-containing oil-proof agent. The oil-proof paper in the above patents fails to provide the oil-proof performance of the single-layer paper-based wrapping paper, and the cost is high and the production is complicated.

Fluorocarbon coating can improve the oil resistance and is used to produce oil-resistant packaging paper, but fluorocarbons are too expensive, harmful to the human body and will change the flavor of food, so they are not suitable for use in food packaging materials.

Both chitosan and paper are environmentally friendly materials that can be completely degraded, fundamentally solving the problem of environmental pollution. Chitosan exhibits chelating properties for calcium in food without reducing the nutritional value of food. Chitosan also has antibacterial and anti-oil properties. Sodium alginate is a natural polymer material, and has the advantages of biodegradability, non-toxicity, wide source, film-forming property, oil resistance and cheap price.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing grease-resistant food wrapping paper that is low in cost, environmentally friendly, good in oil and water resistance, non-toxic, and does not affect food flavor.

According to the technical scheme provided by the present invention, the preparation method of the anti-grease food packaging paper comprises the following steps:

Preparation of anti-grease coating: dissolving chitosan, acetic acid and sodium alginate in deionized water and stirring evenly to make the crude product of anti-grease coating, in the crude material of anti-grease coating, the weight percentage of chitosan is controlled at 0.5% to 10%, the volume percentage of acetic acid is controlled at 0.5% to 10%; the weight percentage of sodium alginate is controlled at 0.1% to 10%;

Vacuum degassing: The finished anti-grease coating is obtained by vacuum degassing the crude anti-grease coating material; the vacuum degree of vacuum degassing is 0.02-0.05MPa;

Coating: Select 60-90g/ ^m2 of packaging base paper, and coat the finished grease-resistant coating on one side of the packaging base paper. The coating amount of the finished grease-resistant coating is 2-10g/ ^m2 to obtain grease-resistant food packaging paper wet material;

Drying: Put the wet material of the anti-grease food wrapping paper into an oven at a temperature of 60-110°C and bake for 2-5 minutes to obtain the dry material of the anti-grease food wrapping paper.

The oil-resistant food wrapping paper obtained by the method of the invention has an oil-resistant value of 6-11, and the oil-resistant food wrapping paper obtained by the method of the invention has the advantages of low cost, environmental protection, good oil and water resistance, non-toxicity, and the like.

Detailed ways

The present invention will be further described below in conjunction with specific examples.

Example 1

Preparation of anti-grease coating: Dissolve 5 grams of chitosan, 5 ml of acetic acid and 20 grams of sodium alginate in deionized water and stir evenly to make 1000ml (about 1000 grams) of anti-grease coating crude product. In, the weight percentage of chitosan is controlled at 0.5%, the volume percentage of acetic acid is controlled at 0.5%; the weight percentage of sodium alginate is controlled at 2%;

Vacuum degassing: use a vacuum degasser to degas the coarse material of the anti-grease coating to obtain a finished anti-grease coating; the vacuum degree of vacuum degassing is 0.02-0.05MPa;

Coating: Select 60-90g/ ^m2 of packaging base paper, and coat the finished grease-resistant coating on one side of the packaging base paper. The coating amount of the finished grease-resistant coating is 5g/ ^m2 to obtain a wet material of grease-resistant food packaging paper ;

Drying: Put the wet material of the anti-grease food packaging paper into a temperature-controllable oven with a temperature of 80°C and bake for 3 minutes to obtain the dry material of the anti-grease food packaging paper.

The obtained anti-grease food packaging paper dry material adopts the international general test method ["oil drop test (oil kitTest-TAPPI T 559 pm-96)"] to measure its anti-grease value of 10.

Example 2

Preparation of anti-grease coating: Dissolve 30 grams of chitosan, 20 ml of acetic acid and 1 gram of sodium alginate in deionized water and stir evenly to prepare 1000 ml (about 1000 grams) of anti-grease coating crude product. In, the weight percentage of chitosan is controlled at 3%, the volume percentage of acetic acid is controlled at 2%; the weight percentage of sodium alginate is controlled at 0.1%;

Vacuum degassing: use a vacuum degasser to degas the coarse material of the anti-grease coating to obtain a finished anti-grease coating; the vacuum degree of vacuum degassing is 0.02-0.05MPa;

Coating: Select 60-90g/ ^m2 of packaging base paper, and coat the finished grease-resistant coating on one side of the packaging base paper. The coating amount of the finished grease-resistant coating is 2g/ ^m2 to obtain a wet material of grease-resistant food packaging paper ;

Drying: Put the wet material of the anti-grease food packaging paper into a temperature-controllable oven with a temperature of 60°C and bake for 5 minutes to obtain the dry material of the anti-grease food packaging paper.

The obtained anti-grease food packaging paper dry material adopts the international general test method ["oil drop test (oil kitTest-TAPPI T 559 pm-96)"] to measure its anti-grease value of 8.

Example 3

Preparation of anti-grease coating: Dissolve 100g of chitosan, 100ml of acetic acid and 100g of sodium alginate in deionized water and stir evenly to make 1000ml (about 1000g) of crude anti-grease coating. In, the weight percentage of chitosan is controlled at 10%, the volume percentage of acetic acid is controlled at 10%; the weight percentage of sodium alginate is controlled at 10%;

Vacuum degassing: use a vacuum degasser to degas the coarse material of the anti-grease coating to obtain a finished anti-grease coating; the vacuum degree of vacuum degassing is 0.02-0.05MPa;

Coating: Select 60-90g/ ^m2 of packaging base paper, and coat the finished grease-resistant coating on one side of the packaging base paper. The coating amount of the finished grease-resistant coating is 10g/ ^m2 to obtain a wet material of grease-resistant food packaging paper ;

Drying: Put the wet material of the anti-grease food packaging paper into a temperature-controllable oven with a temperature of 110°C and bake for 2 minutes to obtain the dry material of the anti-grease food packaging paper.

The obtained anti-grease food packaging paper dry material adopts the international general test method ["oil drop test (oil kitTest-TAPPI T 559 pm-96)"] to measure its anti-grease value of 11.

In an embodiment of the present invention, the other side of the packaging base paper can be coated with conventional mineral coatings in the field of food packaging paper production. Pigments such as calcium carbonate, kaolin, talc, china clay and titanium dioxide can be used in conventional mineral coatings, which can be obtained from It is suitable to select one or more than two of these substances; in addition, conventional mineral paints also contain commonly used additives such as dispersants and binders.

The temperature-controllable oven and the vacuum degasser used in the present invention are conventional equipment.

Claims (1)

1. the preparation method of an anti-fatty foods wrapping paper is characterized in that this preparation method comprises the steps:

The preparation of anti-grease paint: be dissolved in shitosan, acetate and sodium alginate in the deionized water and stir, be made into anti-grease paint crude product, in anti-grease paint coarse fodder, the weight percentage of shitosan is controlled at 0.5%～10%, and the volumn concentration of acetate is controlled at 0.5%～10%; The weight percentage of sodium alginate is controlled at 0.1%～10%;

Vacuum outgas: the anti-grease paint coarse fodder that will be made into obtains making anti-grease paint finished product through vacuum outgas; The vacuum of described vacuum outgas is 0.02-0.05MPa;

Coating: select 60～90g/m ²The packing body paper, with anti-grease paint finished product the packing body paper one side be coated with, the coating weight of anti-grease paint finished product is 2～10g/m ², obtain anti-fatty foods wrapping paper wet feed;

Oven dry: will resist fatty foods wrapping paper wet feed to put into temperature is that 60～110 ℃ baking oven toasted 2～5 minutes, obtains anti-fatty foods wrapping paper siccative.