阅读说明：本技术 一种防水防油剂、制备方法及应用 (Water-proof and oil-proof agent, preparation method and application ) 是由 陈挺 孙小玲 朱华杨 谭康梅 于 2020-07-14 设计创作，主要内容包括：本发明涉及一种防水防油剂、制备方法及应用,该防水防油剂由以下组分和重量百分比制成：苯乙烯丙烯酸聚合物30％～50％、蜂蜡乳液5％～10％、聚乙烯醇2.5％～4.5％、改性淀粉2％～5.5％、增塑剂0.5％～2％、去离子水28％～60％。该防水防油剂成膜性好,形成的涂层中蜂蜡乳液与苯乙烯丙烯酸聚合物结合成疏水疏油表面层,同时与改性淀粉复配,使防水防油涂层对食品级原纸的防水防油效果有明显的改善,防水防油性能极好,完全可以取代传统的涂蜡、涂硅、淋膜工艺,在纸张回收时可直接进入造纸打浆系统回收,减少了淋膜纸对环境的污染,是环境友好型材料。(The invention relates to a waterproof and oil-proof agent, a preparation method and application thereof, wherein the waterproof and oil-proof agent is prepared from the following components in percentage by weight: 30-50% of styrene acrylic polymer, 5-10% of beeswax emulsion, 2.5-4.5% of polyvinyl alcohol, 2-5.5% of modified starch, 0.5-2% of plasticizer and 28-60% of deionized water. The water-proof and oil-proof agent has good film forming property, the beeswax emulsion and the styrene acrylic polymer are combined into a hydrophobic and oleophobic surface layer in the formed coating, and the hydrophobic and oil-proof surface layer is compounded with the modified starch, so that the water-proof and oil-proof coating has obvious improvement on the water-proof and oil-proof effects of food-grade base paper, has excellent water-proof and oil-proof properties, can completely replace the traditional wax coating, silicon coating and film spraying processes, can directly enter a papermaking pulping system for recycling when paper is recycled, reduces the pollution of film spraying paper to the environment, and is an environment-friendly material.)

1. The waterproof and oil-proof agent is characterized by being prepared from the following components in percentage by weight: 30-50% of styrene acrylic polymer, 5-10% of beeswax emulsion, 2.5-4.5% of polyvinyl alcohol, 2-5.5% of modified starch, 0.5-2% of plasticizer and 28-60% of deionized water.

2. The water and oil resistant agent according to claim 1 wherein the styrene acrylic polymer is a styrene-acrylic emulsion.

3. The water and oil resistant agent according to claim 1 or 2 wherein the modified starch is a cationic starch or an anionic starch.

4. The water and oil resistant agent according to claim 1 or 2, wherein the polyvinyl alcohol has a polymerization degree of 1700 to 1800, preferably a molecular weight of 74800 to 79200.

5. The water and oil resistant agent according to claim 1 or 2 wherein the plasticizer is one or a combination of two or more of glycerin, triethyl citrate, and epoxidized soybean oil.

6. A method for producing the water-and oil-repellent agent according to any one of claims 1 to 5, characterized by comprising the steps of:

a1. adding polyvinyl alcohol, plasticizer and beeswax emulsion into deionized water, stirring and mixing uniformly at constant temperature, and then cooling to room temperature to obtain a mixed solution A;

a2. dispersing modified starch in an aqueous solution, stirring and ultrasonically oscillating to form a uniformly dispersed starch solution to obtain a solution B;

a3. and adding the styrene acrylic polymer and the solution B into the mixed solution A, and uniformly stirring to obtain the waterproof and oil-proof agent.

7. The preparation method according to claim 6, wherein the stirring and mixing at constant temperature in step a1 is performed in a water bath at a constant temperature of 70-95 ℃.

8. The preparation method according to claim 6, wherein the stirring and the ultrasonic oscillation in the step a2 are performed by mechanical stirring for 0.5-1 h, and then the mixture is placed in an ultrasonic cleaning agent for ultrasonic oscillation.

9. A food-grade wrapping paper characterized by comprising a food-grade base paper having on its surface a water-and oil-repellent coating formed by coating the water-and oil-repellent agent according to any one of claims 1 to 5.

10. A package box characterized in that the outer surface and/or the inner surface thereof has a water-and oil-repellent coating formed by coating the water-and oil-repellent agent according to any one of claims 1 to 5.

Technical Field

The invention belongs to the technical field of food packaging and water and oil proofing, and particularly relates to a water and oil proofing agent, a preparation method and application thereof.

Background

With the demand of people on good life being higher and higher, the food wrapping paper is used more and more. Food packaging paper commonly used in life, such as take-away lunch boxes and fast food packages, needs to have good water and oil resistance.

However, the applicant found that: most of the waterproof and oilproof food packaging paper in the current market is coated paper. The laminated paper adopts an extrusion composite process, plastic particles such as Polyethylene (PE), polypropylene (PP) and the like are coated on the surface of the paper through a casting machine, the laminated paper has excellent performance in the aspects of water resistance and grease permeation resistance, but the material can not be degraded, is difficult to separate from the paper and can not be directly recycled, and great pollution is brought to the environment. And in addition, a fluorine-containing oil-proof agent is added into the paper pulp, so that the paper is endowed with excellent oil-proof performance, and the problems of degradation and recycling are solved, but the fluorine-containing oil-proof agent contains risk substances such as PFOA, PFOS, mineral oil and the like, and has potential safety hazards on human health.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a waterproof and oil-proof agent, a preparation method thereof and food packaging paper using the waterproof and oil-proof agent.

In order to solve the technical problems, the invention adopts the following technical scheme:

a water-proof and oil-proof agent is prepared from the following components in percentage by weight: 30-50% of styrene acrylic polymer, 5-10% of beeswax emulsion, 2.5-4.5% of polyvinyl alcohol, 2-5.5% of modified starch, 0.5-2% of plasticizer and 28-60% of deionized water.

Further, the styrene acrylic polymer is styrene-acrylic emulsion.

Further, the modified starch is a cationic starch or an anionic starch.

The polyvinyl alcohol is polyvinyl alcohol with the polymerization degree of 1700-1800, and is preferably polyvinyl alcohol with the molecular weight of 74800-79200.

Further, the plasticizer is one or a combination of more than two of glycerol, triethyl citrate and epoxidized soybean oil.

A preparation method of a water-proof and oil-proof agent comprises the following steps:

a1. adding polyvinyl alcohol, plasticizer and beeswax emulsion into deionized water, stirring and mixing uniformly at constant temperature, and then cooling to room temperature to obtain a mixed solution A;

a2. dispersing modified starch in an aqueous solution, stirring and ultrasonically oscillating to form a uniformly dispersed starch solution to obtain a solution B;

a3. and adding the styrene acrylic polymer and the solution B into the mixed solution A, and uniformly stirring to obtain the waterproof and oil-proof agent.

Further, the constant-temperature stirring and mixing in the step a1 means that the stirring and mixing are carried out in a constant-temperature water bath at the temperature of 70-95 ℃; the time of the constant-temperature water bath is preferably 60-90 min.

Further, the stirring and the ultrasonic oscillation in the step a2 are mechanical stirring for 0.5-1 h, and then the mixture is placed in an ultrasonic cleaning agent for ultrasonic oscillation.

The food packaging paper comprises food-grade base paper, wherein the surface of the food-grade base paper is provided with a waterproof and oilproof coating formed by coating the waterproof and oilproof agent.

A packaging box has a water-and oil-repellent coating formed by coating the water-and oil-repellent agent on the outer surface and/or the inner surface thereof.

The invention mainly has the following beneficial effects:

1. the water-proof and oil-proof agent has good film-forming property, the beeswax emulsion and the styrene acrylic acid polymer in the formed coating are combined into a hydrophobic and oleophobic surface layer, and the hydrophobic and oil-proof surface layer is compounded with the modified starch, so that the water-proof and oil-proof coating has obvious improvement on the water-proof and oil-proof effects of food-grade base paper, has excellent water-proof and oil-proof properties, can completely replace the traditional wax coating, silicon coating and film spraying processes, can directly enter a paper making pulping system for recycling when paper is recycled, reduces the pollution of film spraying paper to the environment, and is an environment-friendly material.

2. The waterproof and oil-proof agent adopts polyvinyl alcohol and starch as biological base materials, the beeswax emulsion is food-grade beeswax emulsion, is safe and environment-friendly, does not generate toxic and harmful substances to human bodies, is a healthy and environment-friendly waterproof and oil-proof agent, is coated on the food-grade base paper to form a waterproof and oil-proof coating, and has the excellent characteristics of safety and environmental protection.

3. The coating formed by coating the coating on the food packaging paper has higher waterproof and oil-proof performance and also has heat sealability.

Drawings

FIG. 1 is a schematic flow chart of an embodiment of the water and oil repellent agent of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The invention relates to a waterproof and oil-proof agent, which is prepared from the following components in percentage by weight: 30-50% of styrene acrylic polymer (also called styrene-acrylic polymer), 5-10% of beeswax emulsion, 2.5-4.5% of polyvinyl alcohol, 2-5.5% of modified starch, 0.5-2% of plasticizer and 28-60% of deionized water. The styrene acrylic polymer can be styrene-acrylic emulsion, the beeswax emulsion can be food-grade beeswax emulsion, the modified starch can be cationic starch or anionic starch, the polyvinyl alcohol can be polyvinyl alcohol with the polymerization degree of 1700-1800 (preferably the polyvinyl alcohol with the molecular weight of 74800-79200), and the plasticizer can be one or a combination of more than two of glycerol, triethyl citrate and epoxidized soybean oil.

As shown in fig. 1, the preparation method of the water and oil repellent agent of the present invention specifically comprises the following steps:

s100, adding polyvinyl alcohol, plasticizer and beeswax emulsion into deionized water, stirring and mixing uniformly at constant temperature, and then cooling to room temperature to obtain a mixed solution A; wherein, the constant temperature stirring and mixing is specifically as follows: stirring and mixing uniformly in a constant-temperature water bath at 70-95 ℃, wherein the time of the constant-temperature water bath is preferably 60-90 min.

S200, dispersing modified starch in an aqueous solution, stirring and ultrasonically oscillating to form a uniformly dispersed starch solution to obtain a solution B; wherein, the stirring and the ultrasonic oscillation are realized by mechanical stirring and then ultrasonic oscillation in an ultrasonic cleaning agent for 0.5-1 h, and the oscillation time is preferably 5-30 min.

And S300, adding the styrene acrylic polymer and the solution B into the mixed solution A, and uniformly stirring to obtain the waterproof and oil-proof agent.

The waterproof and oilproof agent can be applied to occasions with higher requirements on waterproof and oilproof grease, and can also be applied to storage, transportation and packaging of direct contact food, such as: the method is applied to products such as food packaging paper, packaging boxes and the like.

The food packaging paper can be food packaging paper for food, catering and other oily food, and comprises food-grade base paper, wherein the surface of the food-grade base paper is provided with a waterproof and oilproof coating formed by coating the waterproof and oilproof agent. The specific manufacturing method can be as follows: coating the water-proof and oil-proof emulsion on the surface of food-grade base paper (such as base paper), drying, and placing under the conditions of constant temperature and constant humidity to obtain a water-based water-proof and oil-proof coating; wherein the temperature and humidity of the constant temperature and humidity is 23 ℃, the humidity is 50%, and the standing time is preferably 48 hours.

After the waterproof and oilproof agent is coated on the surface of food-grade base paper and dried, beeswax emulsion and styrene acrylic polymer are combined into a hydrophobic and oleophobic surface layer and are compounded with modified starch, so that the waterproof and oilproof coating has obvious improvement on the waterproof and oilproof effects of the food-grade base paper, the T559 standard is adopted for the waterproof and oilproof performance, a KIT12 test solution is used for testing, the KIT oilproof level reaches 12, the waterproof and oilproof performance is excellent, the traditional wax, silicon and film coating processes can be completely replaced, the adopted polyvinyl alcohol and starch are bio-based materials, the beeswax emulsion is food-grade beeswax emulsion, and the waterproof and oilproof agent is safe, environment-friendly and free of toxic and harmful substances to a human body, is a healthy and environment-friendly waterproof and oilproof agent, is coated on the food-grade base paper to form the waterproof and oilproof coating, has.

The outer surface and/or the inner surface of the packaging box is/are provided with a waterproof and oilproof coating formed by coating the waterproof and oilproof agent, the manufacturing method is the same as that of food packaging paper, and the method specifically comprises the following steps: coating the waterproof and oilproof emulsion on the outer surface and/or the inner surface of the packaging box, drying, and placing under the conditions of constant temperature and constant humidity to obtain a water-based waterproof and oilproof coating; like this, form waterborne waterproof grease proofing coating at the surface of packing carton and play dampproofing effect, form waterborne waterproof grease proofing coating at the internal surface of packing carton and play dampproofing, waterproof, grease proofing effect.

The water and oil resistant agent, the preparation method and the application of the present invention are further described by the following specific examples.