Titanium dioxide paper and artificial board with same

Abstract

The utility model provides titanium dioxide paper and an artificial board with the titanium dioxide paper. The titanium dioxide paper sequentially comprises a surface coating resin layer, a first amino resin layer, a covering layer, white paper, a second amino resin layer and a back coating resin layer from top to bottom. The amino resin layer and the covering layer are utilized to form three-dimensional covering, and ideal covering power and full whiteness are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of decorative paper, and in particular relates to titanium dioxide paper and an artificial board having the same. Background Art

[0002] Decorative base paper, also known as titanium dioxide paper, is a special industrial paper made of high-quality wood pulp and titanium dioxide pigment through special processing. After printing and melamine resin dipping, it is mainly used for the protective layer paper, surface layer paper and bottom layer paper of fiberboard, particleboard and other artificial boards. When used with other colors, it will give people a natural and generous feeling.

[0003] The production of decorative base paper is divided into plain base paper and printing base paper according to application, and mainly divided into white paper and colored paper according to color. Among them, white paper, including paper with a hue close to white, is the mainstream product of decorative paper. In this type of paper, a large amount of titanium dioxide must be added (about 35% on average, and even up to 45%) to ensure that the color is white, avoid the bottom exposure phenomenon, and prevent the color of the artificial board itself from interfering with the surface color of the decorative board.

[0004] One of the existing technologies is to apply titanium dioxide slurry to the base paper with low gram weight by printing. Another is to add a certain amount of titanium dioxide to the first dip glue or the top-coated glue to increase the hiding power. However, simply adding titanium dioxide will accelerate the curing of the glue to a certain extent (the amount of titanium dioxide added reaches 13% of the glue), resulting in cross-linking between the glue molecules. The viscosity of the glue will increase from the conventional 12s (four cups of coating) to 20s (four cups of coating), affecting the penetration and coating of the glue, thereby affecting the lamination effect. On the other hand, the curing of the first dip amino resin and the top-coated triamine glue also affects the surface stain resistance. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the above-mentioned prior art. To this end, the utility model proposes a titanium dioxide paper and an artificial board having the same.

[0006] According to the first aspect of the utility model, a titanium white paper is provided, which comprises, from top to bottom, a top-coating resin layer, a first amino resin layer, a covering layer, white paper, a second amino resin layer and a back-coating resin layer;

[0007] The covering layer contains the following components: acrylic dispersion resin, acrylic emulsion, polyurethane emulsion, opaque acrylic ester copolymer and titanium dioxide;

[0008] The first amino resin layer and the second amino resin layer independently contain the following components: urea-formaldehyde resin, triamine resin, opaque acrylate copolymer and titanium dioxide;

[0009] The opaque acrylate copolymer has a hollow structure.

[0010] In some embodiments, the molecular weight of the acrylic dispersion resin is less than 10,000, and the solid content of the acrylic dispersion resin is 30-35%. The function of the acrylic dispersion resin is to wrap the titanium dioxide and make it evenly dispersed.

[0011] In some embodiments, the molecular weight of the acrylic emulsion is above 100,000, and the solid content of the acrylic emulsion is 40-45%. The function of the acrylic emulsion is to fix the titanium dioxide and the opaque acrylic ester copolymer after film formation.

[0012] In some embodiments, the molecular weight of the polyurethane emulsion is 1000 to 10000; and / or the solid content of the polyurethane emulsion is 30% to 35%.

[0013] In some embodiments, the opaque acrylate copolymer is an anionic copolymer, and the solid content of the opaque acrylate copolymer is 29-31%.

[0014] In some embodiments, the particle size of the titanium dioxide is 0.2 to 0.5 μm.

[0015] In some embodiments, the molecular weight of the triamine resin is 800-3000.

[0016] In some embodiments, the covering layer is made of the following raw materials in parts by mass: 1-2 parts of monoethanolamine, 2-4 parts of acrylic dispersion resin, 18-22 parts of acrylic emulsion, 0.2-0.3 parts of silicone defoamer, 5-8 parts of polyurethane emulsion, 4-6 parts of opaque acrylate copolymer, 4-6 parts of titanium dioxide, 0.1-0.3 parts of phenylisothiazolinone and 60-70 parts of water.

[0017] In some embodiments, the first amino resin layer and the second amino resin layer are independently prepared from the following raw materials in parts by mass: 83-87 parts of urea-formaldehyde resin, 13-17 parts of triamine resin, 4-6 parts of opaque acrylate copolymer, 4-6 parts of titanium dioxide, 0.2-0.3 parts of curing agent, 0.1-0.2 parts of penetrant and 0.4-0.6 parts of dispersant.

[0018] In some embodiments, the curing agent is ammonium chloride; the penetrant is fatty alcohol polyoxyethylene ether; and the dispersant is at least one of polysiloxane or polyacrylic acid.

[0019] In some embodiments, the top-coating resin layer and the back-coating resin layer are independently composed of triamine glue, and the triamine glue of the top-coating resin layer contains two-dimensional nano-kaolin.

[0020] In some embodiments, the raw materials for preparing the triamine glue include, by weight: 100 parts of 37 wt % formaldehyde solution, 60 parts of water, 8 parts of caprolactam and 90 parts of melamine.

[0021] In some embodiments, the triamine glue is prepared by the following method: formaldehyde solution and water are mixed, the pH is adjusted to 8.5-9.0 by adding caustic soda, and then caprolactam and melamine are added, and the temperature is raised to 95°C after 40-50 minutes, and the water solubility ratio is tested after maintaining the temperature for 60 minutes. When the water solubility ratio is 2.3-2.7, the temperature is lowered to 40-45°C.

[0022] In some embodiments, the triamine glue of the topcoat resin layer contains 1wt% to 2wt% of two-dimensional nano-kaolin. The two-dimensional nano-kaolin has an average thickness of 20 to 50nm and an average diameter of 300nm, and has a synergistic effect with titanium dioxide, which not only has the function of shielding ultraviolet rays, but also can improve the reflection of sunlight, improve the whiteness and gloss of the decorative base paper, and can appropriately reduce the amount of titanium dioxide used and reduce costs.

[0023] In some embodiments, the opaque acrylate copolymer is a hollow copolymer formed by styrene, butyl acrylate and methacrylic acid; and / or the particle size of the opaque acrylate copolymer is about 600 μm.

[0024] After cross-linking and curing, the amino resin forms a three-dimensional network structure with many vacancies, which will lead to poor stain resistance on the surface of the film. The opaque acrylic copolymer with the particle size can be well filled and dispersed in the structural voids of the amino resin, thereby improving the stain resistance of the film.

[0025] In some embodiments, the top coating resin layer has a thickness of 0.4 to 0.6 mm.

[0026] In some embodiments, the thickness of the first amino resin layer is 0.2-0.3 mm.

[0027] In some embodiments, the second amino resin layer has a thickness of 0.2 to 0.3 mm.

[0028] In some embodiments, the covering layer has a thickness of 0.2 to 0.3 mm.

[0029] In some embodiments, the weight of the white paper is 70 to 80 g / m 2 .

[0030] In some embodiments, the back-coating resin layer has a thickness of 0.3 to 0.5 mm.

[0031] According to the second aspect of the present invention, a method for preparing the titanium dioxide paper as described in the first aspect of the present invention is provided, comprising the following steps:

[0032] S1: coating one side of white paper with a layer of diluent and drying it to obtain a covering layer;

[0033] S2: The white paper coated with the covering layer is impregnated with an amino resin, and after drying, an amino resin layer is formed on each side of the white paper;

[0034] S3: Roll-coating triamine glue on the two amino resin layers respectively, and drying to obtain titanium dioxide paper.

[0035] In some embodiments, in step S1, the viscosity of the diluent is 14-16s (apply four cups), the pH of the diluent is between 7 and 8, and the solid content of the diluent is 20%-25%. The diluent is applied to one side of the white paper by a printing press to serve as the first layer of covering.

[0036] In some embodiments, in step S1, the diluent coating amount is 2 to 4 g / m 2 .

[0037] In some embodiments, in step S2, the viscosity of the amino resin is 12-14s (four cups), the pH of the amino resin is between 7 and 8, and the solid content of the amino resin is 45%-50%. The amino resin enters the interior and surface layer of the paper by impregnation, playing the role of a second layer of covering.

[0038] In some embodiments, in step S2, the amount of the amino resin applied is 50 to 60 g / m 2 .

[0039] In some embodiments, in step S2, the drying is performed in a five-section oven, and the temperatures are set to 130°C, 140°C, 150°C, 150°C, and 130°C in sequence; after drying, the volatile matter of the white paper is about 7%.

[0040] In some embodiments, in step S3, the amount of the triamine glue applied is 15 to 18 g / m 2 .

[0041] The utility model also provides an artificial board, comprising the titanium dioxide paper as described in the first aspect of the utility model.

[0042] According to one embodiment of the utility model, at least the following beneficial effects are achieved:

[0043] (1) White paper itself has insufficient hiding power and whiteness. The utility model first prints and coats a hiding layer on white paper. The hiding layer contains titanium dioxide and an opaque acrylic copolymer. The opaque acrylic copolymer has a hollow structure. After the water is dried, air is introduced. The large refractive index difference between air and polymer is utilized to scatter light when it enters. The light cannot pass through, thereby achieving the purpose of hiding. By utilizing the synergistic effect of the two materials, titanium dioxide and the opaque acrylic copolymer, the hiding power can be improved to the effect achieved by adding excessive titanium dioxide alone.

[0044] (2) The utility model utilizes amino resin and a covering layer to form a three-dimensional covering, achieving the most ideal covering power and full whiteness. The titanium dioxide and opaque acrylate copolymer in the covering layer are the first covering layer, while the amino resin is the second covering layer. Both covering layers contain titanium dioxide and opaque acrylate copolymer with covering effect, and have better covering power and full whiteness than a single layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0046] Figure 1 This is a structural diagram of the titanium dioxide paper of Example 1 of the present utility model.

[0047] Reference numerals:

[0048] 101, top coating resin layer; 102, first amino resin layer; 103, covering layer; 104, white paper; 105, second amino resin layer; 106, back coating resin layer. DETAILED DESCRIPTION

[0049] The concept of the present invention and the technical effects produced will be clearly and completely described below in conjunction with the embodiments so as to fully understand the purpose, features and effects of the present invention.

[0050] The titanium dioxide mentioned below was purchased from Chengdu Zhengqi New Materials Co., Ltd., and the opaque acrylate copolymer ROSF-HE380 was purchased from Foshan Rosfu Technology Co., Ltd. The remaining raw materials not described in detail are all conventional commercial products; the process steps or preparation methods not described in detail are all process steps or preparation methods known to those skilled in the art.

[0051] Table 1 Composition of raw materials for preparing titanium dioxide paper of Examples 1-2 and Comparative Examples 1-4 (by mass)

[0052]

[0053]

[0054] Examples 1-2 and Comparative Examples 1-3 The raw materials in parts by weight as shown in Table 1 were weighed to prepare titanium dioxide paper, and the specific steps were as follows:

[0055] (1) Preparation of covering layer:

[0056] Water, monoethanolamine, acrylic dispersion resin, acrylic emulsion, silicone defoamer, polyurethane emulsion, phenylisothiazolinone, opaque acrylate copolymer and titanium dioxide in the weight parts shown in Table 1 were weighed and put into a reaction kettle and mixed evenly to obtain a printing diluent. The printing diluent was applied to a surface with a gram weight of 75 g / m 2 The coating weight is 4g / m2 on the white paper front side. 2 , forming a covering layer after drying.

[0057] (2) Preparation of the first and second amino resin layers:

[0058] Weigh the urea-formaldehyde resin, triamine resin, opaque acrylate copolymer, titanium dioxide, curing agent, penetrant and dispersant in parts by weight as shown in Table 1, put them into a reaction kettle and mix them evenly to obtain a one-dip amino resin. The white paper after the covering layer is dipped in the one-dip amino resin, and after drying, the first amino resin layer and the second amino resin layer are formed on the front and back of the white paper respectively. The glue amount is 55g / m 2 The drying is carried out in a five-section oven, and the temperatures are set to 130°C, 140°C, 150°C, 150°C, and 130°C in sequence; the volatile matter of the white paper after drying is about 7%.

[0059] (3) Roll-coat triamine glue on the first and second amino resin layers respectively. The amount of triamine glue applied is 15 g / m2 based on dry glue. 2 , and after drying, titanium dioxide paper is obtained.

[0060] Among them, the titanium dioxide paper prepared in Example 1 is as follows Figure 1 As shown, from top to bottom, there are top-coating resin layer 101, first amino resin layer 102, covering layer 103, white paper 104, second amino resin layer 105 and back-coating resin layer 106. Among them, the thickness of top-coating resin layer 101 is 0.5mm, the thickness of first amino resin layer 102 and second amino resin layer 105 are both 0.3mm, the thickness of covering layer 103 is 0.3mm, and the thickness of back-coating resin layer 106 is 0.5mm.

[0061] Comparative Example 4

[0062] A method for preparing titanium dioxide paper, which differs from Example 1 in that the preparation and coating of the printing diluent are not performed, and titanium dioxide is additionally added to the raw materials for preparing the amino resin. The specific process is as follows:

[0063] (1) Preparation of the first and second amino resin layers:

[0064] Weigh the urea-formaldehyde resin, triamine resin, opaque acrylate copolymer, titanium dioxide, curing agent, penetrant and dispersant in parts by weight as shown in Table 1, put them into a reaction kettle and mix them evenly to obtain a one-dip amino resin. Dip white paper in the one-dip amino resin, and after drying, form a first amino resin layer and a second amino resin layer on the front and back of the white paper, respectively. The glue amount is 55 g / m 2 The drying is carried out in a five-section oven, and the temperatures are set to 130°C, 140°C, 150°C, 150°C, and 130°C in sequence; the volatile matter of the white paper after drying is about 7%.

[0065] (2) Roll-coat triamine glue on the first and second amino resin layers respectively. The amount of triamine glue applied is 15 g / m2 based on dry glue. 2 , and after drying, titanium dioxide paper is obtained.

[0066] The titanium dioxide paper prepared in Comparative Example 4 comprises, from top to bottom, a top-coating resin layer, a first amino resin layer, white paper, a second amino resin layer and a back-coating resin layer.

[0067] Test example

[0068] Table 2 is a data record table of the pressing test of the titanium dioxide paper prepared in Examples 1-2 and Comparative Examples 1-4.

[0069] Table 2 Titanium dioxide paper pressing test data table

[0070]

[0071] In the above data, whiteness is obtained according to GB / T 7974-2002 test, opacity is obtained according to GB / T 1543-2005 test, and stain resistance is obtained according to GB / T 17657-2013 test. According to Table 2, the whiteness, opacity (hiding power) and stain resistance of the titanium dioxide paper of Example 1 and Example 2 are better than those of Comparative Examples 1-4. Among them, in the preparation process of the covering layer and the amino resin layer of Comparative Example 1, titanium dioxide is replaced by an equal amount of opaque acrylate copolymer, and in the preparation process of the covering layer and the amino resin layer of Comparative Example 2, the opaque acrylate copolymer is replaced by an equal amount of titanium dioxide. The whiteness, hiding power and stain resistance of the titanium dioxide paper prepared by both are not as good as those in Example 1, which proves that titanium dioxide and the opaque acrylate copolymer have a synergistic effect, and the effect is better than any single component when the total content is the same; the amino resin layer of Comparative Example 3 does not contain titanium dioxide, while the covering layer is additionally added with corresponding titanium dioxide, and the titanium dioxide paper of Comparative Example 4 has no covering layer, and its amino resin layer is additionally added with corresponding titanium dioxide. The performance of the titanium dioxide paper prepared by the two is also not as good as that in Example 1, which shows that Example 1 uses the covering layer containing titanium dioxide and opaque acrylate copolymer with covering effect and the amino resin layer to form a three-dimensional covering, which has better hiding power and whiteness than a single layer.

[0072] The above embodiment of the utility model is described in detail in combination with the test data, but the utility model is not limited to the above embodiment. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A titanium dioxide paper, characterized in that: From top to bottom, they are top-coating resin layer, first amino resin layer, covering layer, white paper, second amino resin layer and back-coating resin layer; The thickness of the first amino resin layer is 0.2 to 0.3 mm; The thickness of the second amino resin layer is 0.2 to 0.3 mm; The thickness of the covering layer is 0.2-0.3 mm.

2. The titanium dioxide paper according to claim 1, characterized in that: The thickness of the top coating resin layer is 0.4-0.6 mm.

3. The titanium dioxide paper according to claim 1, characterized in that: The gram weight of the white paper is 70-80 g / m2.

4. The titanium dioxide paper according to claim 1, characterized in that: The thickness of the back-coated resin layer is 0.3-0.5 mm.

5. A wood-based panel, characterized in that: The invention relates to a titanium dioxide paper comprising the titanium dioxide paper according to any one of claims 1 to 4.

Images