阅读说明：本技术 一种水性环保珠光纸及其生产方法 (Water-based environment-friendly pearlescent paper and production method thereof ) 是由 周大仕 车朝晖 宋桂芳 张丽敏 于 2019-10-10 设计创作，主要内容包括：本发明涉及一种水性环保珠光纸及其生产方法,其解决了现有珠光纸折光效果较差、环保性不好的问题。其包括以下步骤：(1)将珠光粉加入到乙醇和水组成的处理液中进行浸泡处理；(2)采用高玻璃化温度与低玻璃化温度的丙烯酸乳液混合后用水稀释得到连接料；(3)浸泡处理后的珠光粉加入到连接料内,并加水调节得到水性环保珠光涂料；(4)水性环保珠光涂料经过上料辊的转动涂至原纸上；(5)计量棒预计量；(6)气刀涂布；(7)干燥。本发明的珠光纸无露底层原纸现象,折光效果好,安全环保,相邻纸张不粘连。本发明方法可广泛应用于粗糙纸张表面以及压纹纸表面涂布涂料制备珠光纸。(The invention relates to aqueous environment-friendly pearlescent paper and a production method thereof, which solve the problems of poor folding effect and poor environment friendliness of the existing pearlescent paper. Which comprises the following steps: (1) adding the pearl powder into a treatment solution consisting of ethanol and water for soaking treatment; (2) mixing acrylic emulsion with high glass transition temperature and low glass transition temperature, and diluting with water to obtain a binder; (3) adding the soaked pearl powder into a connecting material, and adding water for regulation to obtain the water-based environment-friendly pearl coating; (4) coating the water-based environment-friendly pearlescent paint on the base paper by rotating the feeding roller; (5) pre-metering by a metering rod; (6) air knife coating; (7) and (5) drying. The pearlescent paper disclosed by the invention has the advantages of no base paper exposure, good refraction effect, safety, environmental friendliness and no adhesion of adjacent paper. The method can be widely applied to preparing the pearlescent paper by coating the paint on the surface of the rough paper and the surface of the embossed paper.)

1. The production method of the water-based environment-friendly pearlescent paper is characterized by comprising the following steps: the method comprises the following process steps:

(1) adding the pearl powder into the treatment liquid for soaking treatment, wherein the weight ratio of the pearl powder to the treatment liquid is 1:1.5-1:3.5, and the soaking time is 8-12 hours; the treatment fluid is a mixed solution of ethanol and water, and the weight ratio of the ethanol to the water is 2.5:1-1: 1;

(2) mixing two acrylic acid emulsions with different glass transition temperatures to prepare a pearl powder binder, wherein the two acrylic acid emulsions with different glass transition temperatures are respectively a binder A and a binder B, the binder A is an acrylic acid emulsion with a high glass transition temperature, the binder B is an acrylic acid emulsion with a low glass transition temperature, and the mixed binder is diluted by water to obtain a binder with the viscosity of 30-40 s;

(3) uniformly stirring the pearl powder obtained in the step (1) after soaking treatment, adding the pearl powder into the connecting material obtained in the step (2), uniformly mixing, and adding water to adjust the viscosity to 15-20s to obtain the water-based environment-friendly pearl coating;

(4) placing the water-based environment-friendly pearlescent paint obtained in the step (3) into a feeding groove, rotating a feeding roller in the feeding groove to dip the paint, and coating the paint on the base paper through the rotation of the feeding roller;

(5) pre-metering the base paper coated in the step (4) by a metering rod;

(6) the base paper pre-metered by the metering rod in the step (5) passes through an air knife, and the pearlescent coating on the surface of the base paper is uniformly blown under the action of the air knife to obtain pearlescent coating layer paper with uniform thickness;

(7) and (4) drying the pearlescent coating layer paper obtained in the step (6) through an oven to obtain the water-based environment-friendly pearlescent paper.

2. The method for producing the water-based environment-friendly pearlescent paper according to claim 1, characterized in that: and (7) performing corona treatment on the surface of the obtained water-based environment-friendly pearlescent paper under high-frequency voltage.

3. The method for producing the water-based environment-friendly pearlescent paper according to claim 2, characterized in that: the high-frequency voltage is 15 kV.

4. The method for producing the water-based environment-friendly pearlescent paper according to claim 1, characterized in that: in the step (1), the weight ratio of the pearl powder to the treatment liquid is 1:2, and the soaking time of the pearl powder in the treatment liquid is 12 hours; the weight ratio of the ethanol to the water is 1:1.

5. The method for producing the water-based environment-friendly pearlescent paper according to claim 1, characterized in that: in the step (2), the difference value between the glass transition temperature of the connecting material A and the glass transition temperature Tg of the connecting material B is 90-120 ℃, the mixing weight ratio of the connecting material A to the connecting material B is 1:1-1.5:1, and the mixed connecting material and water are mixed and stirred according to the weight ratio of 5:2-5: 4.

6. The method for producing the water-based environment-friendly pearlescent paper according to claim 1, characterized in that: in the step (2), the difference value between the glass transition temperature of the connecting material A and the glass transition temperature Tg of the connecting material B is 90 ℃, the mixing weight ratio of the connecting material A to the connecting material B is 1:1, and the mixed connecting material and water are mixed and stirred according to the weight ratio of 5: 4.

7. The water-based environment-friendly pearlescent paper prepared by the method of any one of claims 1-6.

Technical Field

The invention relates to coated paper with a pigment coating, in particular to water-based environment-friendly pearlescent paper and a production method thereof.

Background

It is known that pearlescent paper, as an art paper, is widely used for packaging various products, book covers, high-grade picture books, greeting cards, hanging tags, etc. because a layer of pearlescent powder with a refraction effect is coated on the surface of the paper.

The surface coating of the existing pearlescent paper is mostly finished by transfer coating by adopting a gravure roller, because the surface of the paper has textures, when the pearlescent paint is transferred to the surface of the paper by the gravure roller, the high points of the textures on the surface of the paper are easily coated with the paint, and the low points of the textures have no pearlescent paint, because the pearlescent paint has a certain thickness on the surface of the paper, the high points of the paper are higher, the low points of the paper are lower, so that coating leakage points exist on the surface of the paper, a pearlescent layer on the surface of the paper has breakpoints, and the refraction effect is greatly reduced.

In addition, the pearlescent paper coated by gravure transfer printing has the advantages that in order to ensure that the pearlescent paint can be well transferred out of the pits of the gravure roller and achieve better coating effect, most of the pearlescent paint used is solvent and oily material, and the coated paper has a certain amount of VOC residues, so that the pearlescent paper belongs to an environmentally-friendly product.

Disclosure of Invention

In order to overcome the defects of poor refraction effect and poor environmental protection property of the existing pearlescent paper caused by the production mode of gravure roller transfer coating, the invention aims to provide the water-based environment-friendly pearlescent paper with good refraction effect and no pollution and the production method thereof.

The technical scheme adopted by the invention for solving the technical problems is as follows: a production method of water-based environment-friendly pearlescent paper comprises the following process steps:

(1) adding the pearl powder into the treatment liquid for soaking treatment, wherein the weight ratio of the pearl powder to the treatment liquid is 1:1.5-1:3.5, and the soaking time is 8-12 hours; the treatment fluid is a mixed solution of ethanol and water, and the weight ratio of the ethanol to the water is 2.5:1-1: 1;

(2) mixing two acrylic acid emulsions with different glass transition temperatures to prepare a pearl powder binder, wherein the two acrylic acid emulsions with different glass transition temperatures are respectively a binder A and a binder B, the binder A is an acrylic acid emulsion with a high glass transition temperature, the binder B is an acrylic acid emulsion with a low glass transition temperature, and the mixed binder is diluted by water to obtain a binder with the viscosity of 30-40 s;

(3) uniformly stirring the pearl powder obtained in the step (1) after soaking treatment, adding the pearl powder into the connecting material obtained in the step (2), uniformly mixing, and adding water to adjust the viscosity to 15-20s to obtain the water-based environment-friendly pearl coating;

(4) placing the water-based environment-friendly pearlescent paint obtained in the step (3) into a feeding groove, rotating a feeding roller in the feeding groove to dip the paint, and coating the paint on the base paper through the rotation of the feeding roller;

(5) pre-metering the base paper coated in the step (4) by a metering rod;

(6) the base paper pre-metered by the metering rod in the step (5) passes through an air knife, and the pearlescent coating on the surface of the base paper is uniformly blown under the action of the air knife to obtain pearlescent coating layer paper with uniform thickness;

(7) and (4) drying the pearlescent coating layer paper obtained in the step (6) through an oven to obtain the water-based environment-friendly pearlescent paper.

Preferably, the surface of the water-based environment-friendly pearlescent paper obtained in the step (7) is subjected to corona treatment under high-frequency voltage.

Preferably, the high-frequency voltage is 15 kV.

Preferably, in the step (1), the weight ratio of the pearl essence to the treatment liquid is 1:2, and the soaking time of the pearl essence in the treatment liquid is 12 hours; the weight ratio of the ethanol to the water is 1:1.

Preferably, in the step (2), the difference between the glass transition temperature of the binder A and the glass transition temperature Tg of the binder B is 90-120 ℃, the mixing weight ratio of the binder A to the binder B is 1:1-1.5:1, and the mixed binder and water are mixed and stirred according to the weight ratio of 5:2-5: 4.

Preferably, in the step (2), the difference between the glass transition temperature of the binder A and the glass transition temperature Tg of the binder B is 90 ℃, the mixing weight ratio of the binder A to the binder B is 1:1, and the mixed binder and water are mixed and stirred according to the weight ratio of 5: 4.

The invention has the following beneficial effects:

(1) the aqueous environment-friendly pearlescent coating disclosed by the invention is good in rheological property, can be suitable for air knife coating, can form a uniform pearlescent coating on the surface of base paper, is free from the phenomenon of base paper exposure, is good in refraction effect, safe and environment-friendly, and can be applied to coating on the surface of rough paper and the surface of embossed paper;

(2) the binder is prepared by mixing two acrylic latex with different glass transition temperatures, so that the problems that the acrylic latex coating with high glass transition temperature is hard and the paper is brittle, and the acrylic latex coating with low glass transition temperature is sticky to cause the adhesion of two adjacent papers together are solved;

(3) by carrying out corona treatment on the paper surface, the problems of poor ink absorption performance of the acrylic pearlescent coating, low ink drying speed during printing and the like are solved, and the ink adhesive force on the surface of the paper is improved.

Drawings

FIG. 1 is a schematic view of a production apparatus of example 1 of the present invention;

FIG. 2 is a schematic view showing the effect of air knife coating in example 1 of the present invention;

FIG. 3 is a schematic view showing the effect of blade coating in example 1 of the present invention;

FIG. 4 is a schematic view showing a bar coating effect of embodiment 1 of the present invention;

fig. 5 is a schematic view of the gravure coating effect of example 1 of the present invention.

The labels in the figure are: 1. the device comprises a feeding groove, 2 feeding rollers, 3 metering rods, 4 metering rod feed-back grooves, 5 air knife feed-back grooves, 6 air knives and 7 baking ovens.

Detailed Description

The present invention will be further described with reference to the following examples.

The production device of the water-based environment-friendly pearlescent paper is shown in figure 1.

As shown in fig. 1, the production device of the water-based environment-friendly pearlescent paper is sequentially provided with a feeding groove 1, a metering rod 3, an air knife 6 and an oven 7, a feeding roller 2 is arranged above the feeding groove 1, a metering rod feed-back groove 4 is arranged below the metering rod 3, an air knife feed-back groove 5 is arranged below the air knife 6, the metering rod feed-back groove 4 is communicated with the feeding groove 1, the air knife feed-back groove 5 is communicated with the feeding groove 1, liquid in the metering rod feed-back groove 4 can flow into the feeding groove 1, and liquid in the air knife feed-back groove 5 can also flow into the feeding groove 1, so that the coating can be recycled, and the production device is environment-.