阅读说明：本技术 一种添加硫酸钡的密胺树脂餐具的制备方法 (Preparation method of melamine resin tableware added with barium sulfate ) 是由 周锋 于 2020-12-15 设计创作，主要内容包括：本发明提供一种添加硫酸钡的密胺树脂餐具的制备方法,涉及密胺树脂餐具领域,其原料为密胺树脂、纤维素、钛酸酯、纳米麦饭石粉、抗氧剂、卵磷脂复合物、脱模剂、硬化剂；着色剂、硫酸钡和催干剂。本发明通过设计一种添加硫酸钡的密胺树脂餐具的制备方法,通过在餐具外面涂覆有着色剂,并在着色剂与餐具之间涂覆有一层共聚物乳液透明防水材料,可对密胺餐具起到防水防潮的效果,同时在着色剂内部添加硫酸钡和催干剂,硫酸钡和催干剂在涂料中是作为体质颜料应用于涂料中,对提高涂漠的厚度,耐磨性,耐水性,耐热性,表面硬度,耐冲击性等起着很重要的作用,提高餐具的寿命。(The invention provides a preparation method of melamine resin tableware added with barium sulfate, relating to the field of melamine resin tableware, wherein the raw materials comprise melamine resin, cellulose, titanate, nano medical stone powder, an antioxidant, a lecithin compound, a release agent and a hardening agent; colorant, barium sulfate and drier. The invention designs a preparation method of melamine resin tableware added with barium sulfate, which can play a role in water and moisture resistance for melamine tableware by coating a coloring agent outside the tableware and coating a layer of copolymer emulsion transparent waterproof material between the coloring agent and the tableware, and simultaneously adding barium sulfate and a drier inside the coloring agent, wherein the barium sulfate and the drier are used as body pigments in a coating and applied to the coating, thereby playing an important role in improving the thickness, wear resistance, water resistance, heat resistance, surface hardness, impact resistance and the like of the coating and prolonging the service life of the tableware.)

1. A preparation method of melamine resin tableware added with barium sulfate is characterized in that: the feed is prepared from the following raw materials in parts by weight:

80-85% of melamine resin, 10-15% of cellulose, 5-10% of titanate, 5-10% of nano medical stone powder, 5-10% of antioxidant, 5-10% of lecithin compound, 5-10% of release agent and 5-10% of hardening agent;

80-90% of a coloring agent, 20-30% of barium sulfate and 20-30% of a drier.

2. The method for preparing melamine resin tableware containing barium sulfate according to claim 1, which comprises the following components in parts by mass: 83% of melamine resin, 13% of cellulose, 7% of titanate, 7% of nano medical stone powder, 7% of antioxidant, 7% of lecithin compound, 7% of release agent and 7% of hardening agent;

85% of colorant, 25% of barium sulfate and 25% of drier.

3. The method for producing barium sulfate-added melamine resin tableware according to any one of claims 1 to 2, wherein: the cellulose is one or more of carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and ethyl cellulose.

4. The method for preparing melamine resin tableware containing barium sulfate according to claim 2, wherein: the method comprises the following steps:

(1) mixing materials: firstly, sequentially pouring melamine resin, cellulose, titanate, nano medical stone powder, an antioxidant and a lecithin compound into a mixing bin, then stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder for 20-30 min by a stirring rod clockwise, changing the direction, and stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder, the antioxidant and the lecithin compound counterclockwise for 20-30 min;

(2) crushing and screening: pouring the material mixed in the step (1) into a crushing bin, crushing the material by a crushing blade until the material is crushed into a powdery structure, and then screening by a screen, wherein the mesh number of the screen is 500-800 meshes, so as to obtain a melamine powder mixture;

(3) curing the resin: adding the melamine powder mixture obtained in the step (2) into a high-frequency heater according to the required amount of the product, heating the mixture at the temperature of 150-200 ℃ for 30-40 seconds to enable the powdery resin to be pasty, and adding a small amount of acid into the melamine powder mixture as a catalyst in the curing process to improve the curing rate;

(4) compression molding: putting the pre-molded pasty resin into a mold, closing the mold, pressurizing to 15-30 Mpa, curing at 160-170 ℃ for 30-40 seconds, opening the mold, then sequentially adding a release agent and a hardening agent, closing the mold, opening the mold after 30-40 seconds, and taking out a semi-finished product of the molded tableware;

(5) and (3) cooling: rapidly cooling the semi-finished tableware taken out in the step (4) by using a cooling machine until the temperature is reduced to 50-60 ℃, taking out the semi-finished tableware, placing the semi-finished tableware outdoors, and naturally cooling the semi-finished tableware until the temperature is reduced to room temperature;

(6) pattern engraving: carving patterns on the surface of the semi-finished tableware by using an electronic carving machine, removing dust and impurities on the surface by using a fan after carving, and then coating a layer of transparent waterproof material on the surface;

(7) coloring: firstly, mixing a coloring agent, barium sulfate and a drier with colors required by tableware according to a weight ratio of 4-4.5: 1:1, then coating a coating in a pattern groove formed on the surface of a semi-finished product of the tableware so as to realize coloring, carrying out heat treatment at 200-210 ℃ for 4-6 min after the coating is solidified, and finally carrying out rapid cooling through a cooling machine until the temperature is room temperature.

5. The method for preparing melamine resin tableware with added barium sulfate as claimed in claim 4, wherein: the drier in the step (7) is dibutyltin dilaurate.

6. The method for preparing melamine resin tableware with added barium sulfate as claimed in claim 4, wherein: in the step (3), the weight ratio of the acid to the melamine powder mixture is 1: 8-9.

7. The method for preparing melamine resin tableware with added barium sulfate as claimed in claim 4, wherein: the transparent waterproof material in the step (6) is copolymer emulsion.

8. The method for preparing melamine resin tableware with added barium sulfate as claimed in claim 4, wherein: the colorant in the step (7) is solvent-based paint prepared from titanium dioxide, carbon black, iron oxide red, ultramarine, phthalocyanine blue, phthalocyanine green, permanent red and aluminum powder.

Technical Field

The invention relates to the field of melamine resin tableware, in particular to a preparation method of melamine resin tableware added with barium sulfate.

Background

Melamine tableware, also known as porcelain-like tableware, is formed by heating, pressurizing and pressing melamine resin powder. Melamine tableware is used in catering industry, children's diet industry, etc. because of its light weight, beautiful appearance, low temperature resistance, and non-fragility. The melamine resin has the characteristics of no odor, no toxicity, bright color and the like, and the tableware manufactured by the melamine resin can be safely used for a long time within the range of 30-120 ℃. The tableware has the advantages of smooth, light and attractive surface, low temperature resistance (the tableware can be directly placed in a refrigerator), boiling resistance (boiling water boiling), pollution resistance, difficult breaking and the like, and is widely applied to the fields of fast food industry, worker canteens, children food industry and the like.

However, as the amount of melamine tableware is gradually increased, the defects of easy breakage, wear resistance, water resistance, heat resistance, surface hardness and poor impact resistance of melamine resin become more and more prominent, and the defects become short plates which restrict the development of the melamine resin, so the invention provides a preparation method of melamine resin tableware added with barium sulfate to solve the problems.

Disclosure of Invention

The invention aims to provide a preparation method of melamine resin tableware added with barium sulfate, and the preparation method is used for solving the technical problems.

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

a preparation method of melamine resin tableware added with barium sulfate is characterized in that: the feed is prepared from the following raw materials in parts by weight:

80-85% of melamine resin, 10-15% of cellulose, 5-10% of titanate, 5-10% of nano medical stone powder, 5-10% of antioxidant, 5-10% of lecithin compound, 5-10% of release agent and 5-10% of hardening agent;

80-90% of a coloring agent, 20-30% of barium sulfate and 20-30% of a drier.

Preferably, the preparation method of the melamine resin tableware added with barium sulfate comprises the following components in parts by mass: 83% of melamine resin, 13% of cellulose, 7% of titanate, 7% of nano medical stone powder, 7% of antioxidant, 7% of lecithin compound, 7% of release agent and 7% of hardening agent;

85% of colorant, 25% of barium sulfate and 25% of drier.

Preferably, the cellulose is one or more of carboxymethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and ethyl cellulose.

Preferably, the preparation method of the melamine resin tableware added with barium sulfate comprises the following steps:

(1) mixing materials: firstly, sequentially pouring melamine resin, cellulose, titanate, nano medical stone powder, an antioxidant and a lecithin compound into a mixing bin, then stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder for 20-30 min by a stirring rod clockwise, changing the direction, and stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder, the antioxidant and the lecithin compound counterclockwise for 20-30 min;

(2) crushing and screening: pouring the material mixed in the step (1) into a crushing bin, crushing the material by a crushing blade until the material is crushed into a powdery structure, and then screening by a screen, wherein the mesh number of the screen is 500-800 meshes, so as to obtain a melamine powder mixture;

(3) curing the resin: adding the melamine powder mixture obtained in the step (2) into a high-frequency heater according to the required amount of the product, heating the mixture at the temperature of 150-200 ℃ for 30-40 seconds to enable the powdery resin to be pasty, and adding a small amount of acid into the melamine powder mixture as a catalyst in the curing process to improve the curing rate;

(4) compression molding: putting the pre-molded pasty resin into a mold, closing the mold, pressurizing to 15-30 Mpa, curing at 160-170 ℃ for 30-40 seconds, opening the mold, then sequentially adding a release agent and a hardening agent, closing the mold, opening the mold after 30-40 seconds, and taking out a semi-finished product of the molded tableware;

(5) and (3) cooling: rapidly cooling the semi-finished tableware taken out in the step (4) by using a cooling machine until the temperature is reduced to 50-60 ℃, taking out the semi-finished tableware, placing the semi-finished tableware outdoors, and naturally cooling the semi-finished tableware until the temperature is reduced to room temperature;

(6) pattern engraving: carving patterns on the surface of the semi-finished tableware by using an electronic carving machine, removing dust and impurities on the surface by using a fan after carving, and then coating a layer of transparent waterproof material on the surface;

(7) coloring: firstly, mixing a coloring agent, barium sulfate and a drier with colors required by tableware according to a weight ratio of 4-4.5: 1:1, then coating a coating in a pattern groove formed on the surface of a semi-finished product of the tableware so as to realize coloring, carrying out heat treatment at 200-210 ℃ for 4-6 min after the coating is solidified, and finally carrying out rapid cooling through a cooling machine until the temperature is room temperature.

Preferably, the drier used in the step (7) is dibutyltin dilaurate.

Preferably, in the step (3), the weight ratio of the acid to the melamine powder mixture is 1: 8-9.

Preferably, the transparent waterproof material in step (6) is a copolymer emulsion.

Preferably, the colorant in the step (7) is solvent-based paint prepared from titanium dioxide, carbon black, iron oxide red, ultramarine, phthalocyanine blue, phthalocyanine green, permanent red and aluminum powder.

The invention has the beneficial effects that:

the invention designs a preparation method of melamine resin tableware added with barium sulfate, which can play a role in water and moisture resistance for melamine tableware by coating a coloring agent outside the tableware and coating a layer of copolymer emulsion transparent waterproof material between the coloring agent and the tableware, and simultaneously adding barium sulfate and a drier inside the coloring agent, wherein the barium sulfate and the drier are used as body pigments in a coating and applied to the coating, thereby playing an important role in improving the thickness, wear resistance, water resistance, heat resistance, surface hardness, impact resistance and the like of the coating and prolonging the service life of the tableware.

Detailed Description

The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

Example 1

A preparation method of melamine resin tableware added with barium sulfate comprises the following raw materials by weight:

83% of melamine resin, 13% of cellulose, 7% of titanate, 7% of nano medical stone powder, 7% of antioxidant, 7% of lecithin compound, 7% of release agent and 7% of hardening agent;

85% of colorant, 25% of barium sulfate and 25% of drier.

The method comprises the following steps:

(1) mixing materials: firstly, sequentially pouring melamine resin, cellulose, titanate, nano medical stone powder, an antioxidant and a lecithin compound into a mixing bin, then stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder for 25min by a stirring rod clockwise, changing the direction, and stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder, the antioxidant and the lecithin compound counterclockwise for 25min by the stirring rod;

(2) crushing and screening: pouring the mixed material obtained in the step (1) into a crushing bin, crushing the material by a crushing blade until the material is crushed into a powdery structure, and then screening by a screen, wherein the mesh number of the screen is 650 meshes, so as to obtain a melamine powder mixture;

(3) curing the resin: adding the melamine powder mixture obtained in the step (2) into a high-frequency heater according to the required amount of a product, heating the mixture at 180 ℃ for 35S to enable the powdery resin to be pasty, and adding a small amount of acid into the melamine powder mixture as a catalyst in the curing process to improve the curing rate;

(4) compression molding: placing the pre-molded pasty resin into a mold, closing the film and pressurizing to 23Mpa, curing at 165 ℃ for 35S, opening the mold, then sequentially adding a release agent and a hardening agent, closing the film, opening the mold after 35S, and taking out the semi-finished product of the molded tableware;

(5) and (3) cooling: rapidly cooling the semi-finished tableware taken out in the step (4) by using a cooling machine until the temperature is reduced to 55 ℃, taking out the semi-finished tableware, placing the semi-finished tableware outdoors, and naturally cooling the semi-finished tableware until the temperature is reduced to room temperature;

(6) pattern engraving: carving patterns on the surface of the semi-finished tableware by using an electronic carving machine, removing dust and impurities on the surface by using a fan after carving, and then coating a layer of transparent waterproof material on the surface;

(7) coloring: firstly, mixing a coloring agent, barium sulfate and a drier with the required color of tableware according to the weight ratio of 4.25:1:1, then coating a coating in a pattern groove formed on the surface of a semi-finished product of the tableware so as to realize coloring, carrying out heat treatment for 5min at 205 ℃ after the coating is solidified, and finally carrying out rapid cooling through a cooling machine until the temperature is room temperature.

And (4) the drier in the step (7) is dibutyltin dilaurate. In the step (3), the weight ratio of the acid to the melamine powder mixture is 1: 8.5. The transparent waterproof material in the step (6) is copolymer emulsion. The colorant in the step (7) is solvent-based paint prepared from titanium dioxide, carbon black, iron oxide red, ultramarine, phthalocyanine blue, phthalocyanine green, permanent red and aluminum powder.

Example 2

A preparation method of melamine resin tableware added with barium sulfate comprises the following raw materials by weight:

80% of melamine resin, 10% of cellulose, 5% of titanate, 5% of nano medical stone powder, 5% of antioxidant, 5% of lecithin compound, 5% of release agent and 5% of hardening agent;

80% of colorant, 20% of barium sulfate and 20% of drier.

The method comprises the following steps:

(1) mixing materials: firstly, sequentially pouring melamine resin, cellulose, titanate, nano medical stone powder, an antioxidant and a lecithin compound into a mixing bin, then stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder for 20min by a stirring rod clockwise, changing the direction, and stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder, the antioxidant and the lecithin compound counterclockwise for 20min by the stirring rod;

(2) crushing and screening: pouring the material mixed in the step (1) into a crushing bin, crushing the material by a crushing blade until the material is crushed into a powdery structure, and then screening by a screen, wherein the mesh number of the screen is 500 meshes, so as to obtain a melamine powder mixture;

(3) curing the resin: adding the melamine powder mixture obtained in the step (2) into a high-frequency heater according to the required amount of a product, heating the mixture at 150 ℃ for 30 seconds to enable the powdery resin to be pasty, and adding a small amount of acid serving as a catalyst into the melamine powder mixture in the curing process to improve the curing rate;

(4) compression molding: putting the pre-molded pasty resin into a mold, closing the film and pressurizing to 15Mpa, curing at 160 ℃ for 30S, opening the mold, then sequentially adding a release agent and a hardening agent, closing the film, opening the mold after 30S, and taking out the semi-finished product of the molded tableware;

(5) and (3) cooling: rapidly cooling the semi-finished tableware taken out in the step (4) by using a cooling machine until the temperature is reduced to 50 ℃, taking out the semi-finished tableware, placing the semi-finished tableware outside, and naturally cooling the semi-finished tableware until the temperature is reduced to room temperature;

(6) pattern engraving: carving patterns on the surface of the semi-finished tableware by using an electronic carving machine, removing dust and impurities on the surface by using a fan after carving, and then coating a layer of transparent waterproof material on the surface;

(7) coloring: firstly, mixing a coloring agent, barium sulfate and a drier with the required color of tableware according to the weight ratio of 4:1:1, then coating a coating in a pattern groove formed on the surface of a semi-finished product of the tableware so as to realize coloring, carrying out heat treatment at 200 ℃ for 4min after the coating is solidified, and finally carrying out rapid cooling through a cooling machine until the temperature is room temperature.

And (4) the drier in the step (7) is dibutyltin dilaurate. In the step (3), the weight ratio of the acid to the melamine powder mixture is 1:8. The transparent waterproof material in the step (6) is copolymer emulsion. The colorant in the step (7) is solvent-based paint prepared from titanium dioxide, carbon black, iron oxide red, ultramarine, phthalocyanine blue, phthalocyanine green, permanent red and aluminum powder.

Example 3

A preparation method of melamine resin tableware added with barium sulfate comprises the following raw materials by weight:

85% of melamine resin, 15% of cellulose, 10% of titanate, 10% of nano medical stone powder, 10% of antioxidant, 10% of lecithin compound, 10% of release agent and 10% of hardening agent;

90% of colorant, 30% of barium sulfate and 30% of drier.

The method comprises the following steps:

(1) mixing materials: firstly, sequentially pouring melamine resin, cellulose, titanate, nano medical stone powder, an antioxidant and a lecithin compound into a mixing bin, then stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder for 30min by a stirring rod clockwise, changing the direction, and stirring the melamine resin, the cellulose, the titanate, the nano medical stone powder for 30min by a stirring rod anticlockwise;

(2) crushing and screening: pouring the material mixed in the step (1) into a crushing bin, crushing the material by a crushing blade until the material is crushed into a powdery structure, and then screening by a screen mesh, wherein the mesh number of the screen mesh is 800 meshes, so as to obtain a melamine powder mixture;

(3) curing the resin: adding the melamine powder mixture obtained in the step (2) into a high-frequency heater according to the required amount of a product, heating the mixture at 200 ℃ for 40 seconds to enable the powdery resin to be pasty, and adding a small amount of acid serving as a catalyst into the melamine powder mixture in the curing process to improve the curing rate;

(4) compression molding: putting the pre-molded pasty resin into a mold, closing the film and pressurizing to 30Mpa, curing at 170 ℃ for 40S, opening the mold, then sequentially adding a release agent and a hardening agent, closing the film, opening the mold after 40S, and taking out the semi-finished product of the molded tableware;

(5) and (3) cooling: rapidly cooling the semi-finished tableware taken out in the step (4) by using a cooling machine until the temperature is reduced to 60 ℃, taking out the semi-finished tableware, placing the semi-finished tableware outside, and naturally cooling the semi-finished tableware until the temperature is reduced to room temperature;

(6) pattern engraving: carving patterns on the surface of the semi-finished tableware by using an electronic carving machine, removing dust and impurities on the surface by using a fan after carving, and then coating a layer of transparent waterproof material on the surface;

(7) coloring: firstly, mixing a coloring agent, barium sulfate and a drier with the required color of tableware according to the weight ratio of 4.5:1:1, then coating a coating in a pattern groove formed on the surface of a semi-finished product of the tableware so as to realize coloring, carrying out heat treatment at 210 ℃ for 6min after the coating is solidified, and finally carrying out rapid cooling through a cooling machine until the temperature is room temperature.

And (4) the drier in the step (7) is dibutyltin dilaurate. In the step (3), the weight ratio of the acid to the melamine powder mixture is 1: 9. The transparent waterproof material in the step (6) is copolymer emulsion. The colorant in the step (7) is solvent-based paint prepared from titanium dioxide, carbon black, iron oxide red, ultramarine, phthalocyanine blue, phthalocyanine green, permanent red and aluminum powder.

The following test results were obtained by testing the tableware manufactured in examples 1 to 3:

analyzing experimental data:

melamine resin tableware was produced by the methods of example 1, example 2 and example 3, and the produced tableware and the tableware of the prior art were tested for water resistance, heat resistance and abrasion resistance, respectively, and it was found that the tableware obtained in example 1 had higher water resistance, heat resistance and abrasion resistance than the tableware obtained in examples 2 and 3, and the melamine resin tableware obtained in examples 1, 2 and 3 had higher water resistance, heat resistance and abrasion resistance than the tableware obtained in the prior art (without barium sulfate), and thus the melamine resin tableware prepared in example 1 was obtained as the best solution.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.