CN102898670B - Biodegradable environmentally-friendly paper and preparation method thereof - Google Patents

Abstract

The invention belongs to the field of papermaking, and relates to an environmentally friendly paper using non-wood pulp and non-paper pulp as raw materials, in particular to a biodegradable environmentally friendly paper and a preparation method thereof. The raw material used in the environmentally friendly paper of the present invention is starch, a natural polymer material with biodegradability, which can be non-edible starch. Also add inorganic filler powder, and additives such as binders, coupling agents, lubricants, plasticizers, etc., granulate through a screw extruder, and then use film blowing equipment, calendering equipment or casting equipment to prepare films . After passing through the coating machine, a layer of coating liquid is coated on the prepared film, and then dried and flattened to prepare the film, and the film obtained by drying the coated coating liquid on the film The environmentally friendly paper of the present invention composed of a coating layer. This environmentally friendly paper has good biodegradability and good performance.

Description

A kind of biodegradable environmental protection paper and preparation method thereof

technical field

The invention belongs to the field of papermaking, and relates to an environmentally friendly paper using non-wood pulp and non-paper pulp as raw materials, in particular to a biodegradable environmentally friendly paper and a preparation method thereof.

Background technique

At present, the writing paper, reproduction paper, toilet paper, household paper, decorative paper, etc. used at home and abroad mostly use wood pulp and paper pulp as raw materials, which consumes a lot of natural resources such as trees. resource. Moreover, a large amount of water is consumed in the papermaking process, and a large amount of sewage is generated, which pollutes the environment. Therefore, people are looking for new materials to replace pulp to produce paper products to solve resource problems and environmental pollution problems.

In the process of looking for new materials to replace pulp to produce paper products, people gradually pay attention to plastic paper (some people call it stone paper, or it may be because stone powder is the main component). , polypropylene or polyvinyl chloride and other plastics, add 50-80wt% calcium carbonate (it can also be a stone-milled powder containing calcium carbonate, or light calcium carbonate-obtained by chemical reaction), titanium dioxide, di One or more of ore powders such as silicon oxide and clay or chemically reacted powders. Baking powder is also added to make it biodegradable after use, reducing the impact on the environment. However, adding 0.3 to 0.5 wt% of fermentation powder to the polyolefin is far from enough to solve the degradation of the polyolefin, and the degradation of the polyolefin is still difficult to degrade under the action of the fermentation powder. Such plastic paper (or so-called biodegradable paper) will not only not degrade, but also cause re-pollution to the environment. Therefore, developing a truly biodegradable paper is a top priority and a need for social development.

The new century will face two major problems, one is the resource problem (energy problem); the other is the environmental pollution problem. Due to the massive exploitation of petroleum resources and the rapid increase in the consumption of petroleum products, the petroleum resources are becoming increasingly exhausted (it is reported that there are still about 40 years of exploitable time), and the environmental pollution is becoming more and more serious. In particular, people use a large number of plastics that are difficult to degrade, and the "white pollution" caused by people is shocking. The "CDM Program (Clean Development Technology Program)" promoted by the United Nations aims to reduce waste emissions and reduce environmental pollution worldwide. Therefore, finding new resources for sustainable development and exploring and researching environmentally friendly materials have become an important topic for human survival and development. Natural polymer materials such as starch and cellulose are obtained by photosynthesis of plants. They are extremely rich in resources and widely exist in the fruits and stems of plants. They are sustainable and easy to degrade in the natural environment. An ideal material to solve the above problems. Natural polymer materials have good biodegradability and resource sustainability. Therefore, the research and application of biodegradable materials have attracted great attention from governments all over the world.

In the short 20 years since plastics entered my country as a packaging material, the output of plastic products has jumped to the fourth place in the world. my country's environmental protection investment from 1991 to 1995 was 80 billion yuan, and from 1996 to 2000 it reached 450 billion yuan, which seriously restricted my country's economic development. The non-degradability of plastic packaging products and the serious harm of its "white pollution" have caused incalculable losses to society and the environment. If they are not controlled and stopped, it will bring harm to our future generations and the earth we live on to great adverse effects. This problem has attracted the attention of governments all over the world, and they have actively taken measures to stop it and seek new alternatives to solve the problem of environmental pollution. At present, the enterprises that produce plastic paper have solved the resource problem and pollution problem of pulp and paper making on the one hand, and on the other hand, they are also generating a large number of pollution sources.

As plastic paper, at the beginning stage today, active measures should be taken to avoid causing a large amount of pollution in the future like plastic packaging. At the same time, biodegradable materials and products should be actively used instead of plastics to produce various papers.

The biodegradable environmentally friendly paper proposed by the present invention can use non-edible starch, such as tapioca starch, old starch (deteriorated and non-nutritive) and inorganic ore powder, etc., to solve the problem of papermaking on the resource impact and environmental pollution. On the other hand, it also solves the problem of "white pollution" of plastics.

Contents of the invention

One of the objectives of the present invention is to provide a biodegradable environmentally friendly paper that will not affect resources or pollute the environment. This environmentally friendly paper can be completely biodegradable.

The second object of the present invention is to provide a method for preparing biodegradable environmentally friendly paper.

The biodegradable environmental protection paper of the present invention is that the raw materials of the following components are added into a high-speed mixer according to the proportion and mixed uniformly, extruded and granulated by a screw extruder, and prepared into a film by using film blowing equipment, calendering equipment or casting equipment , through a coating machine, coating a layer of coating liquid on the film, then drying and flattening to prepare the biodegradable environment-friendly paper.

The biodegradable environmental protection paper of the present invention is made of film, and the coating obtained after being dried by the coated coating solution on described film; Wherein:

The composition and component content of described film are:

The composition and component content of described coating liquid are:

Polyacrylate emulsion, polyurethane emulsion or their mixture 30～75wt%

Inorganic filler powder 20～40wt%

Water Balance

The particle size of the inorganic filler powder in the film is 800-2000 mesh. The inorganic filler powder in the film is selected from one or more of calcium carbonate powder, magnesium hydroxide powder, titanium dioxide, magnesium hydroxide ore powder and silicate ore powder.

The particle size of the inorganic filler powder in the coating liquid is 800-2000 mesh. The inorganic filler powder in the coating liquid is selected from one or more of light calcium carbonate, talcum powder and titanium dioxide.

The starch can be non-edible industrial starch; it is corn starch, tapioca starch or their mixture.

The adhesive is polyvinyl alcohol (PVA), ethylene-vinyl acetate copolymer (EVA) or their mixture.

The plasticizer is selected from one or more of sorbitol, glycerol and dioctyl phthalate.

The lubricant is liquid paraffin, polyethylene wax or their mixture.

The coupling agent is a silane coupling agent and/or a titanate coupling agent.

The silane coupling agent is selected from one or more of KH550, KH560 and KH570.

The solid content in the polyurethane emulsion, polyacrylate emulsion or their mixture is between 40% and 50%.

The preparation method of the biodegradable environmental protection paper of the present invention: the starch (industrial starch) of 20～40wt%, the inorganic filler powder of 50～70wt%, the binder of 1～4wt%, the plasticizing of 1～4wt% agent, 0.5-1wt% lubricant and 0.5-1wt% coupling agent are added to a high-speed mixer and mixed evenly, and then extruded and granulated by a screw extruder (single-screw extruder or twin-screw extruder), The granulated granules are prepared into films on film blowing equipment, calendering equipment or casting equipment, and the prepared film is passed through a coating machine, and a layer of coating liquid is coated on the surface of the film, and after further drying and flattening to prepare the biodegradable environment-friendly paper. The obtained biodegradable environmental protection paper can be further processed into finished products of various specifications through cutting and other processes.

The particle size of the inorganic filler powder in the film is 800-2000 mesh. The inorganic filler powder in the film is selected from one or more of calcium carbonate powder, magnesium hydroxide powder, titanium dioxide, magnesium hydroxide ore powder and silicate ore powder.

The composition and component content of described coating liquid are:

Polyacrylate emulsion, polyurethane emulsion or their mixture 30～75wt%

Inorganic filler powder 20～40wt%

Water Balance

The particle size of the inorganic filler powder in the coating liquid is 800-2000 mesh. The inorganic filler powder in the coating liquid is selected from one or more of light calcium carbonate, talcum powder and titanium dioxide.

The solid content in the polyurethane emulsion, polyacrylate emulsion or their mixture is between 40% and 50%.

The invention is based on the principle of biodegradability of natural polymer materials, and designs and prepares a biodegradable environmentally friendly paper. The raw material used in the environmentally friendly paper of the present invention is starch, a natural polymer material with biodegradability, which can be non-edible starch. Also add natural inorganic filler powder, and additives such as binders, coupling agents, lubricants, plasticizers, etc., granulate through a screw extruder, and then use film blowing equipment, calendering equipment or casting equipment to prepare into a thin film. After passing through the coating machine, a layer of coating liquid is coated on the prepared film, and then dried, flattened and cut to prepare papers of different sizes. This environmentally friendly paper has good biodegradability and good performance.

Detailed ways

Example 1

The corn starch of 40wt%, the particle diameter of 54wt% is 1000 mesh calcium carbonate powder, the polyvinyl alcohol binding agent of 1wt%, the plasticizer of 4wt% (3wt% sorbitol+1wt% polydioctyl phthalate ester), 0.5wt% polyethylene wax and 0.5wt% silane coupling agent KH550 are added to a high-speed mixer and mixed and dispersed evenly, then extruded and granulated by a screw extruder, and the granulated pellets are blown Films were prepared on-device.

The blown film is passed through a coating machine, a layer of coating liquid is coated on the surface of the film, and then dried and flattened to prepare biodegradable environmental protection paper. According to the requirements for paper, the obtained biodegradable environmentally friendly paper can be further processed into cutting and other processes to prepare finished paper of various specifications.

Described coating liquid is the polyacrylic ester emulsion of 10wt% commercialization and the polyurethane emulsion of 40wt% commercialization (the total amount of the solid content in polyurethane emulsion and polyacrylate emulsion is 45wt%), and 40wt% Inorganic filler powder (20wt% of light calcium carbonate with a particle size of 800 mesh, 18wt% of talc powder with a particle size of 2000 mesh, 2wt% of titanium dioxide with a particle diameter of 2000 mesh) was prepared by mixing the remainder of water.

Example 2

The corn starch of 20wt%, the particle diameter of 70wt% is the calcium carbonate of 2000 meshes, the polyvinyl alcohol binder of 4wt%, the plasticizer of 4wt% (3wt% glycerol+1wt% polyphthalate dimethyl ester), 1wt% of liquid paraffin and 1wt% of silane coupling agent KH560 are added to a high-speed mixer, mixed and dispersed evenly, and then extruded and granulated by a screw extruder, and the granulated pellets are prepared on film blowing equipment into a thin film.

The blown film is passed through a coating machine, a layer of coating liquid is coated on the surface of the film, and then dried and flattened to prepare biodegradable environmental protection paper. According to the requirements for paper, the obtained biodegradable environmentally friendly paper can be further processed into cutting and other processes to prepare finished paper of various specifications.

Described coating liquid is the polyacrylic ester emulsion of 40wt% commercialization and the polyurethane emulsion of 10wt% commercialization (the total amount of the solid content in polyurethane emulsion and polyacrylate emulsion is 45wt%), and 20wt% The inorganic filler powder (10wt% of light calcium carbonate with a particle size of 800 mesh, 10wt% of talcum powder with a particle size of 2000 mesh) was prepared by mixing the rest of the water.

Example 3

The tapioca starch of 30wt%, the particle diameter of 63.5wt% are 1200 mesh calcium carbonate powders, the ethylene-vinyl acetate copolymer binding agent of 1wt%, the plasticizer of 4wt% (3wt% sorbitol+1wt% glycerol ), 1wt% of liquid paraffin and 0.5wt% of silane coupling agent KH570 are added to a high-speed mixer, mixed and dispersed evenly, then extruded and granulated by a screw extruder, and the granulated pellets are cast on the cast film equipment Prepared as a thin film.

The blown film is passed through a coating machine, a layer of coating liquid is coated on the surface of the film, and then dried and flattened to prepare biodegradable environmental protection paper. According to the requirements for paper, the obtained biodegradable environmentally friendly paper can be further processed into cutting and other processes to prepare finished paper of various specifications.

Described coating solution is the polyacrylic ester emulsion of commercialization and the polyurethane emulsion of 20wt% commercialization (the total amount of the solid content in polyurethane emulsion and polyacrylate emulsion is 45wt%) with 30wt% and 40wt% Inorganic filler powder (20 wt% of light calcium carbonate with a particle size of 2000 mesh, 19 wt% of talc powder with a particle size of 800 mesh, 1 wt% of titanium dioxide with a particle size of 2000 mesh) was prepared by mixing the rest of the water.

Example 4

With the cornstarch of 20wt%, the cassava starch of 10wt%, the particle diameter of 64wt% is the magnesium hydroxide powder of 2000 meshes, the EVA binding agent of 1wt%, the plasticizer of 4wt% (1wt% sorbitol+3wt% glycerine Alcohol), the polyethylene wax of 0.5wt% and the silane coupling agent KH570 of 0.5wt% join in the high-speed mixer and mix and disperse evenly, then extrude granulation through screw extruder, the granulation after casting Thin films were prepared on membrane equipment.

The blown film is passed through a coating machine, a layer of coating liquid is coated on the surface of the film, and then dried and flattened to prepare biodegradable environmental protection paper. According to the requirements for paper, the obtained biodegradable environmentally friendly paper can be further processed into cutting and other processes to prepare finished paper of various specifications.

Described coating liquid is that the particle diameter of 30wt% is the light calcium carbonate powder of 800 meshes and the water of remainder Prepared by mixing.

Example 5

The corn starch of 40wt%, the particle diameter of 53wt% is the magnesium hydroxide ore powder of 2000 meshes, the polyvinyl alcohol binder of 3wt%, the glycerol plasticizer of 3wt%, the polyethylene wax of 0.5wt% and 0.5 The wt% titanate coupling agent is added into a high-speed mixer to mix and disperse evenly, and then extruded and granulated by a screw extruder, and the granulated granules are prepared into a film on a calendering film equipment.

The blown film is passed through a coating machine, a layer of coating liquid is coated on the surface of the film, and then dried and flattened to prepare biodegradable environmental protection paper. According to the requirements for paper, the obtained biodegradable environmentally friendly paper can be further processed into cutting and other processes to prepare finished paper of various specifications.

Described coating solution is the commercialized inorganic filler powder (particle diameter is 800 order light calcium carbonate 10wt% with the commercialization polyurethane emulsion of 75wt% (the solid content in the polyurethane emulsion is 50wt%), 20wt%, It is prepared by mixing 9 wt% of talc powder with a particle size of 2000 mesh, 1 wt% of titanium dioxide with a particle size of 800 mesh) and the rest of water.

Example 6

The corn starch of 40wt%, the particle diameter of 50.5wt% is the silicate ore powder of 2000 mesh, the polyvinyl alcohol binder of 4wt%, the plasticizer of 4wt% (2wt% sorbitol+2wt% polyphthalate Dioctyl formate), the liquid paraffin of 1wt% and the silane coupling agent KH560 of 0.5wt% join in the high-speed mixer and mix and disperse evenly, then extrude granulation through the screw extruder, the granulation after the calendering Thin films were prepared on membrane equipment.

The blown film is passed through a coating machine, a layer of coating liquid is coated on the surface of the film, and then dried and flattened to prepare biodegradable environmental protection paper. According to the requirements for paper, the obtained biodegradable environmentally friendly paper can be further processed into cutting and other processes to prepare finished paper of various specifications.

Described coating solution is the polyacrylic ester emulsion of commercialization and the polyurethane emulsion of 20wt% commercialization (the total amount of the solid content in polyurethane emulsion and polyacrylate emulsion is 45wt%) with 30wt% and 40wt% Inorganic filler powder (20 wt% of light calcium carbonate with a particle size of 800 mesh, 20 wt% of talcum powder with a particle size of 2000 mesh) was prepared by mixing the remainder of water.

Example 7

With the cornstarch of 30wt%, the particle diameter of 60wt% is 2000 order calcium carbonate powder, the particle diameter of 3.5wt% is the magnesium hydroxide powder of 2000 order, the polyvinyl alcohol binding agent of 4wt%, the plasticizer of 1wt% ( 0.5wt% sorbitol+0.5wt% polydioctyl phthalate), 0.5wt% polyethylene wax and 1wt% silane coupling agent KH550 are added to a high-speed mixer and mixed evenly, and then passed through a screw extruder Extrusion granulation, and the granulated pellets are prepared into films on cast film equipment.

The blown film is passed through a coating machine, a layer of coating liquid is coated on the surface of the film, and then dried and flattened to prepare biodegradable environmental protection paper. According to the requirements for paper, the obtained biodegradable environmentally friendly paper can be further processed into cutting and other processes to prepare finished paper of various specifications.

Described coating liquid is the polyacrylic ester emulsion of 10wt% commercialization and the polyurethane emulsion of 40wt% commercialization (the total amount of the solid content in polyurethane emulsion and polyacrylate emulsion is 45wt%), and 40wt% Inorganic filler powder (20wt% of light calcium carbonate powder with a particle size of 800 mesh, 20wt% of talc powder with a particle size of 2000 mesh) was prepared by mixing the rest of the water.

Example 8

With the cornstarch of 30wt%, the particle diameter of 40wt% is 2000 mesh calcium carbonate powder, the particle diameter of 21.5wt% is the titanium dioxide of 800 mesh, the EVA binding agent of 3wt%, the plasticizer of 4wt% (3wt% sorbitol +1wt% polydioctyl phthalate), 0.5wt% liquid paraffin, 0.5wt% titanate coupling agent and 0.5wt% silane coupling agent KH560 join in the high-speed mixer and mix and disperse evenly, then The pellets are extruded and granulated by a screw extruder, and the granulated pellets are prepared into a film on a film blowing equipment.

The blown film is passed through a coating machine, a layer of coating liquid is coated on the surface of the film, and then dried and flattened to prepare biodegradable environmental protection paper. According to the requirements for paper, the obtained biodegradable environmentally friendly paper can be further processed into cutting and other processes to prepare finished paper of various specifications.

Described coating liquid is the polyacrylic ester emulsion of commercialization and the polyurethane emulsion of 30wt% commercialization (the total amount of the solid content in polyurethane emulsion and polyacrylate emulsion is 40wt%), and 30wt% Inorganic filler powder (29 wt% of light calcium carbonate powder with a particle size of 800 mesh, 1 wt% of titanium dioxide with a particle size of 2000 mesh) was prepared by mixing the rest of the water.

Claims (8)

1. A biodegradable environment-friendly paper, characterized in that, the biodegradable environment-friendly paper is made of a film, and on the film, the coating solution obtained after being dried by the coated coating constitutes ;in: The composition and component content of described film are: The inorganic filler powder in the film is selected from one or more of calcium carbonate powder, magnesium hydroxide powder, titanium dioxide and silicate ore powder; The plasticizer is selected from one or more of sorbitol, glycerol and dioctyl phthalate; The composition and component content of described coating liquid are: Polyacrylate emulsion, polyurethane emulsion or their mixture 30～75wt% Inorganic filler powder 20～40wt% Water Balance The solid content in the polyurethane emulsion, polyacrylate emulsion or their mixture is between 40% and 50%; the inorganic filler powder in the coating liquid is selected from light calcium carbonate, talcum powder and titanium dioxide one or more of. 2. The biodegradable environmentally friendly paper according to claim 1, characterized in that: the particle size of the inorganic filler powder in the film is 800 to 2000 mesh; the particle size of the inorganic filler powder in the coating liquid is The particle size is 800-2000 mesh. 3. The biodegradable environmentally friendly paper according to claim 1, characterized in that: the starch is corn starch, tapioca starch or their mixture. 4. The biodegradable environment-friendly paper according to claim 1, characterized in that: said adhesive is polyvinyl alcohol, ethylene-vinyl acetate copolymer or their mixtures. 5. The biodegradable environment-friendly paper according to claim 1, characterized in that: said lubricant is liquid paraffin, polyethylene wax or their mixture. 6. The biodegradable environmentally friendly paper according to claim 1, characterized in that: the coupling agent is a silane coupling agent and/or a titanate coupling agent. 7. The biodegradable environment-friendly paper according to claim 6, characterized in that: said silane coupling agent is selected from one or more of KH550, KH560 and KH570. 8. A method for preparing biodegradable environmentally friendly paper according to any one of claims 1 to 7, characterized in that: 20 to 40 wt % of starch, 50 to 70 wt % of inorganic filler powder, 1 to 4 wt % % binder, 1-4wt% plasticizer, 0.5-1wt% lubricant and 0.5-1wt% coupling agent are added to the mixer and mixed evenly, and then extruded and granulated by a screw extruder. The granulated material is prepared into a film on film blowing equipment, calendering equipment or casting equipment, and the prepared film is passed through a coating machine, and a layer of coating liquid is coated on the surface of the film, dried and flattened to prepare Obtain the described biodegradable environmental protection paper; The inorganic filler powder in the film is selected from one or more of calcium carbonate powder, magnesium hydroxide powder, titanium dioxide and silicate ore powder; The plasticizer is selected from one or more of sorbitol, glycerol and dioctyl phthalate; The composition and component content of described coating liquid are: Polyacrylate emulsion, polyurethane emulsion or their mixture 30～75wt% Inorganic filler powder 20～40wt% Water Balance The solid content in the polyurethane emulsion, polyacrylate emulsion or their mixture is between 40% and 50%; the inorganic filler powder in the coating liquid is selected from light calcium carbonate, talcum powder and titanium dioxide one or more of.