Water-based matt tape core for water-based correction tape, preparation method of water-based matt tape core and correction tape

Abstract

The patent provides a water-based matt tape core for a water-based correction tape, the tape core comprises a tape core coating, the tape core coating sequentially comprises a stripping layer, a covering agent layer and a binder layer, and the safe and harmless covering agent layer is prepared from a water-based emulsion and a low-reflective pigment in water-based slurry. According to the invention, an oily system is changed into a water-based system, water is used as a solvent, and the water-based emulsion is used as a film-forming substance, so that the harm of harmful solvents to production personnel and environment is avoided; the matt effect is achieved by using the titanium dioxide coated with the silicon dioxide in the formula, the titanium dioxide coated with the silicon dioxide has a microcosmic porous structure, the original particle size of the unground low-reflection pigment is within the range of 3-5 microns, light reflection is small, and therefore the matt purpose is achieved. The invention further provides a water-based correction tape and a preparation method of the water-based matt tape core for the water-based correction tape.

Description

Technical Field

[0001] This patent relates to the field of matte coating technology, and in particular to a water-based matte tape core for water-based correction tape, a preparation method thereof, and a correction tape, which is mainly used as a correction tape product for covering and correcting handwriting. Background Art

[0002] Correction tape is the most widely used and most comprehensive correction product on the market. Compared with correction fluid, it has the characteristics of being ready to use and safe to use. However, the correction tapes on the domestic market are all oily. In the production process, benzene organic matter is still used as a solvent, and the correction tape is prepared by volatilization and drying to form a film, which poses a great threat to production personnel and the environment.

[0003] With the continuous improvement of the country's economic development and the enhancement of people's safety and environmental awareness, the harmfulness of oily correction tape will become the main factor restricting the development of correction tape products. Therefore, it is an inevitable trend for water-based correction tape to replace oily correction tape. The present invention proposes a solution for water-based correction tape based on the concept of safety and environmental protection. On the other hand, we also pay attention to the fact that the glossiness of domestic correction tape brand products on the market is generally in the range of matte to semi-gloss, and there is no product that can achieve matte. This is also a major challenge to consumers' eye health. Therefore, the present invention also provides solutions to this problem from multiple aspects such as coating pigments and formulas. Summary of the invention

[0004] In order to provide a water-based correction tape that is safe, environmentally friendly, has low production costs, has a matte gloss, and protects the eyes from reflection damage, and to reduce the harm of the volatilization of organic solvents in traditional correction tapes to the human body, this patent provides the following technical solutions:

[0005] The first aspect: provides a water-based matte tape core for a water-based correction tape, the tape core includes a tape core coating, the tape core coating includes a peeling layer, a concealing agent layer and an adhesive layer in sequence, the concealing agent layer is safe and harmless, and the concealing agent layer is prepared by an aqueous emulsion and a low-reflective pigment in an aqueous slurry.

[0006] Furthermore, the aqueous slurry also includes water, filler, viscosity modifier, light stabilizer and surfactant.

[0007] Furthermore, the components of the aqueous slurry are composed of the following ingredients by weight: 16-19 parts, 19-22 parts or 22-25 parts of aqueous emulsion; 29-35 parts, 35-41 parts or 41-47 parts of low-reflective pigment; 0.2-0.5 parts, 0.5-0.8 parts or 0.8-1.1 parts of viscosity regulator; 0.2-0.5 parts, 0.5-0.8 parts or 0.8-1.1 parts of surfactant; 0.1-0.3 parts, 0.3-0.6 parts or 0.6-0.9 parts of light stabilizer; 8-12 parts, 12-16 parts or 16-20 parts of filler; 26-29 parts, 29-32 parts or 32-35 parts of water.

[0008] Furthermore, the components of the aqueous slurry include, by weight: 16 to 19 parts, 19 to 22 parts or 22 to 25 parts of aqueous emulsion; 29 to 35 parts, 35 to 41 parts or 41 to 47 parts of low-reflective pigment; 0.2 to 0.5 parts, 0.5 to 0.8 parts or 0.8 to 1.1 parts of viscosity regulator; 0.2 to 0.5 parts, 0.5 to 0.8 parts or 0.8 to 1.1 parts of surfactant; 0.1 to 0.3 parts, 0.3 to 0.6 parts or 0.6 to 0.9 parts of light stabilizer; 8 to 12 parts, 12 to 16 parts or 16 to 20 parts of filler; 26 to 29 parts, 29 to 32 parts or 32 to 35 parts of water.

[0009] Furthermore, the aqueous emulsion is one or more selected from pure acrylic emulsion, styrene acrylic emulsion, silicone acrylic emulsion, and styrene-butadiene emulsion; the non-volatile component content of the aqueous emulsion is 44-48%, 48-52% or 52-56%.

[0010] Furthermore, the low-reflective pigment is a porous white pigment in which an inorganic matting pigment and a titanium dioxide pigment core are wrapped by an inorganic adhesive, wherein the mass ratio of the inorganic adhesive to the titanium dioxide pigment core is 15:85-20:80, 20:80-25:75 or 25:75-30:70; the inorganic matting pigment is calcium carbonate particles or silicon dioxide particles, the average particle size of the inorganic matting pigment is 0.10-0.17, 0.17-0.24 or 0.24-0.31 μm, and the average particle size of the titanium dioxide pigment core is 0.20-0.27, 0.27-0.34, 0.34-0.41, 0.41-0.48 or 0.48-0.55 μm.

[0011] Furthermore, the filler is one or more selected from calcium carbonate, calcium sulfate, silicon dioxide, and titanium dioxide; the viscosity modifier is one or more selected from polyurethane, xanthan gum, and cellulose; and the surfactant is one or more selected from nonionic surfactants and anionic surfactants.

[0012] Furthermore, the 60° glossiness of the opacifier layer is lower than 10 GU.

[0013] A second aspect: provides a water-based correction tape, comprising the water-based matte tape core of the water-based correction tape.

[0014] The third aspect: provides a method for preparing a water-based matte tape core for a water-based correction tape, the preparation method comprising: Z1: preparing an initial low-reflective pigment; Z2: mixing water, a low-reflective pigment, a filler, and a surfactant evenly at room temperature, and grinding to make the D50 particle size of the low-reflective pigment and the filler in the range of 300-500nm to obtain a titanium dioxide slurry; Z3: mixing the titanium dioxide slurry with an aqueous emulsion and a viscosity regulator evenly at room temperature to obtain an aqueous slurry; Z4: coating the aqueous slurry on a peeling layer, and obtaining a concealing agent layer through high-temperature drying at 100-120°C; Z5: coating an aqueous pressure-sensitive adhesive evenly on the concealing agent layer, and obtaining a water-based matte tape core for a water-based correction tape through high-temperature drying at 90-110°C.

[0015] Further: Z1 is specifically: Z1-1: disperse titanium dioxide pigment and inorganic matting pigment in water, and mix into sodium silicate aqueous solution; Z1-2: heat and stir the solution obtained in step Z1-1, and mix into sulfuric acid aqueous solution and adjust the pH to 7.0-7.5, and let stand; Z1-3: filter the solution obtained in step Z1-2 and preliminarily grind the filtrate to obtain an initial low-reflective pigment.

[0016] This patent has the following beneficial effects:

[0017] 1. The prior art uses benzene organic matter as a solvent to prepare oily correction tapes. Compared with oily correction fluids, oily correction tapes avoid consumers from being exposed to toxic and harmful substances, but the volatilization of a large amount of harmful solvents during the production process still poses a great threat to production personnel and the environment. This patent changes the oily system to an aqueous system, uses water as a solvent, and uses an aqueous emulsion as a film-forming substance, thereby avoiding the harm caused by harmful solvents to production personnel and the environment. At the same time, since the correction tape is prepared by the volatilization of water during production, the production enterprise can reuse water vapor after heating and cooling, thereby achieving the purpose of energy conservation and emission reduction.

[0018] 2. The prior art uses untreated ordinary titanium dioxide. When the untreated ordinary titanium dioxide is arranged at the nanometer particle size, its surface is relatively flat at the microscopic level, so it reflects more light. However, this patent achieves the matte effect by using titanium dioxide coated with silica in the formula. The titanium dioxide coated with silica itself has a microscopic porous structure, and the original particle size of the unground low-reflective pigment is in the range of 3-5μm, which reflects less light, thereby achieving the purpose of matte.

[0019] 3. This patent provides a water-based matte tape core for water-based correction tape, including a peeling layer, a concealing agent layer, an adhesive layer and a concealing agent layer formula, and provides a method for preparing the matte tape core. Tape core samples are prepared from the components and weights of various concealing agent layer formulas, and the coating adhesion performance, coating hiding performance, coating re-writing performance and glossiness of all tape core samples are tested and compared, proving that the water-based correction tape core provided by this patent has good adhesion performance, hiding performance and re-writing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of this patent, the following is a brief introduction to the drawings required for use in the embodiment. It should be understood that the following drawings only show certain embodiments of this patent and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic diagram of the structure of a water-based matte tape core used in a water-based correction tape of this patent.

[0022] The reference numerals are described as follows:

[0023] 1: Peel off layer

[0024] 2: Opaquer layer

[0025] 3: Adhesive layer. DETAILED DESCRIPTION

[0026] The detailed features and advantages of this patent are described in detail in the specific implementation method below, and the content is sufficient to enable any technical personnel in this field to understand the technical content of this patent and implement it accordingly. According to the description, claims and drawings disclosed in this specification, technical personnel in this field can easily understand the relevant purposes and advantages of this patent.

[0027] The terms used in this patent are for the purpose of describing specific embodiments only and are not intended to limit this patent. The singular forms "a", "the" and "the" used in this patent and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0028] It should be understood that although the terms "first", "second", "third", etc. may be used in this patent to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this patent, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this patent, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0029] The non-volatile component content in the claims is also called solid content, which refers to the content of solid matter remaining after the water evaporates from the emulsion after being heated under specific conditions.

[0030] In the following examples, the specific raw material names and purchasing manufacturers are shown in Table 1:

[0031] Table 1: Raw material names and purchasing manufacturers

[0032]

[0033]

[0034] Example 1

[0035] The water-based correction tape provided in this embodiment has a water-based matte tape core, and a peeling layer of 15 μm, a covering agent layer of 20 μm and an adhesive layer of 2 μm are sequentially arranged with a thickness of 15 μm.

[0036] The peeling layer provided in this embodiment is a PET release film, whose inner peeling force is 1000-1500g / 25mm and outer peeling force is 8-13g / 25mm. In addition to the polyester film PET release film in this embodiment, other material substrates can be horizontally unfolded according to this embodiment.

[0037] Preparation of low-reflective pigment: 43g of titanium dioxide powder (average particle size: 0.24μm) and 27.6g of calcium carbonate powder (average particle size: 0.15μm) are dispersed in 273.2g of pure water. 38.8g of water glass (sodium silicate aqueous solution) is added to the solution and mixed to prepare a sodium silicate solution containing titanium dioxide pigment and calcium carbonate. The solution is heated to 80°C under stirring and 1.8wt% sulfuric acid aqueous solution is added successively within 3 hours to adjust the pH to 7.0-7.5. After standing for 6 hours, a composite pigment of titanium dioxide and calcium carbonate with silicon dioxide as a binder can be obtained, and the low-reflective pigment of the present invention can be obtained by filtering and grinding, and the initial average particle size of the low-reflective pigment is 4.3μm.

[0038] In other specific embodiments, in addition to calcium carbonate, microscopic inorganic materials such as silicon dioxide can also be used as matte pigments. In addition, the matte effect can be adjusted by adjusting the ratio of sodium silicate and titanium dioxide.

[0039] The covering layer formula provided in this embodiment is as follows by weight:

[0040]

[0041] 0.2 parts nonionic surfactant

[0042] Light-resistant agent 0.6 parts 4,4'-dihydroxybenzophenone

[0043] At room temperature, low-reflective pigment and surfactant are dispersed in deionized water by a high-speed disperser to obtain titanium dioxide slurry, and the titanium dioxide slurry is transferred to a grinding device for appropriate secondary grinding, and the pigment particle size D50 is in the range of 350-450nm, and then the ground titanium dioxide slurry is transferred to a dispersion tank, and an aqueous emulsion and a viscosity regulator are added and stirred evenly to obtain an aqueous slurry, and the aqueous slurry is coated on a PET release film by a roller coating device, and then dried in a 100-120°C oven at high temperature to obtain a covering agent layer after removing moisture.

[0044] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive, which is evenly coated on the above-mentioned concealing agent layer by a stainless steel mesh roller, and is dried in a 90-110°C oven at high temperature to remove moisture, thereby obtaining a correction tape core in which a concealing agent film layer and an adhesive film layer are sequentially stacked on a PET release film.

[0045] Example 2

[0046] The matte tape core for correction tape provided in this embodiment has a peeling layer of 15 μm, a covering agent layer of 20 μm and an adhesive layer of 2 μm arranged in sequence.

[0047] The peeling layer provided in this embodiment is a PET release film, and its inner peeling force is 1000-1500g / 25mm, and its outer peeling force is 8-13g / 25mm.

[0048] The covering layer formula provided in this embodiment is as follows by weight:

[0049] Water 30 parts deionized water

[0050] Water-based emulsion 15 parts acrylic emulsion

[0051] 8 parts polyurethane emulsion

[0052] Low-reflective pigment 30 parts Low-reflective pigment (average particle size 4300nm)

[0053] Filler 15 parts titanium dioxide

[0054] Viscosity modifier 0.5 parts xanthan gum

[0055] Surfactant 0.7 parts Silane coupling agent

[0056] 0.2 parts nonionic surfactant

[0057] Light-resistant agent 0.6 parts 4,4'-dihydroxybenzophenone

[0058] At room temperature, low-reflective pigments, fillers, and surfactants are dispersed in deionized water by a high-speed disperser to obtain titanium dioxide slurry, and the titanium dioxide slurry is transferred to a grinding device for appropriate secondary grinding. The pigment particle size D50 is in the range of 350-450nm, and then the ground titanium dioxide slurry is transferred to a dispersion tank, and an aqueous emulsion and a viscosity regulator are added and stirred evenly to obtain an aqueous slurry. The aqueous slurry is coated on a PET release film by a roller coating device, and is dried in a 100-120°C oven at high temperature to obtain a covering agent layer after removing moisture.

[0059] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive, which is evenly coated on the above-mentioned concealing agent layer by a stainless steel mesh roller, and is dried in a 90-110°C oven at high temperature to remove moisture, thereby obtaining a correction tape core in which a concealing agent film layer and an adhesive film layer are sequentially stacked on a PET release film.

[0060] Example 3

[0061] The matte tape core for correction tape provided in this embodiment has a peeling layer of 15 μm, a covering agent layer of 20 μm and an adhesive layer of 2 μm arranged in sequence.

[0062] The peeling layer provided in this embodiment is a PET release film, and its inner peeling force is 1000-1500g / 25mm, and its outer peeling force is 8-13g / 25mm.

[0063] The covering layer formula provided in this embodiment is as follows by weight:

[0064] Water 30 parts deionized water

[0065] Water-based emulsion 15 parts acrylic emulsion

[0066] 8 parts polyurethane emulsion

[0067] Low-reflective pigment 30 parts Low-reflective pigment (average particle size 4300nm)

[0068] Filler 15 parts calcium carbonate

[0069] Viscosity modifier 0.5 parts sodium carboxymethyl cellulose

[0070] Surfactant 0.7 parts Silane coupling agent

[0071] 0.2 parts anionic surfactant

[0072] Light-resistant agent 0.6 parts 4,4'-dihydroxybenzophenone

[0073] At room temperature, low-reflective pigments, fillers, and surfactants are dispersed in deionized water by a high-speed disperser to obtain titanium dioxide slurry, and the titanium dioxide slurry is transferred to a grinding device for appropriate secondary grinding. The pigment particle size D50 is in the range of 350-450nm, and then the ground titanium dioxide slurry is transferred to a dispersion tank, and an aqueous emulsion and a viscosity regulator are added and stirred evenly to obtain an aqueous slurry. The aqueous slurry is coated on a PET release film by a roller coating device, and is dried in a 100-120°C oven at high temperature to obtain a covering agent layer after removing moisture.

[0074] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive, which is evenly coated on the above-mentioned concealing agent layer by a stainless steel mesh roller, and is dried in a 90-110°C oven at high temperature to remove moisture, thereby obtaining a correction tape core in which a concealing agent film layer and an adhesive film layer are sequentially stacked on a PET release film.

[0075] Comparative Example 1

[0076] The present embodiment provides a correction tape core, comprising a peeling layer with a thickness of 15 μm, a covering agent layer with a thickness of 20 μm, and an adhesive layer with a thickness of 2 μm arranged in sequence.

[0077] The peeling layer is a PET release film, and its inner peeling force is 1000-1500g / 25mm and its outer peeling force is 8-13g / 25mm.

[0078] The covering layer formula is as follows by weight:

[0079] Water 30 parts deionized water

[0080] Water-based emulsion 15 parts acrylic emulsion

[0081] 2 parts polyurethane emulsion

[0082] Pigment 30 parts low reflective pigment (average particle size 4300nm)

[0083] Filler 15 parts titanium dioxide

[0084] Viscosity modifier 0.5 parts xanthan gum

[0085] Surfactant 0.7 parts Silane coupling agent

[0086] 0.2 parts nonionic surfactant

[0087] Light-resistant agent 0.6 parts 4,4'-dihydroxybenzophenone

[0088] At room temperature, low-reflective pigments, fillers, and surfactants are dispersed in deionized water by a high-speed disperser to obtain titanium dioxide slurry, and the titanium dioxide slurry is transferred to a grinding device for appropriate secondary grinding. The pigment particle size D50 is in the range of 350-450nm, and then the ground titanium dioxide slurry is transferred to a dispersion tank, and an aqueous emulsion and a viscosity regulator are added and stirred evenly to obtain an aqueous slurry. The aqueous slurry is coated on a PET release film by a roller coating device, and is dried in a 100-120°C oven at high temperature to obtain a covering agent layer after removing moisture.

[0089] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive, which is evenly coated on the above-mentioned concealing agent layer by a stainless steel mesh roller, and is dried in a 90-110°C oven at high temperature to remove moisture, thereby obtaining a correction tape core in which a concealing agent film layer and an adhesive film layer are sequentially stacked on a PET release film.

[0090] Comparative Example 2

[0091] The present embodiment provides a correction tape core, comprising a peeling layer with a thickness of 15 μm, a covering agent layer with a thickness of 20 μm, and an adhesive layer with a thickness of 2 μm arranged in sequence.

[0092] The peeling layer is a PET release film, and its inner peeling force is 1000-1500g / 25mm and its outer peeling force is 8-13g / 25mm.

[0093] The covering layer formula is as follows by weight:

[0094]

[0095] At room temperature, low-reflective pigments, fillers, and surfactants are dispersed in deionized water by a high-speed disperser to obtain titanium dioxide slurry, and the titanium dioxide slurry is transferred to a grinding device for appropriate secondary grinding. The pigment particle size D50 is in the range of 350-450nm, and then the ground titanium dioxide slurry is transferred to a dispersion tank, and an aqueous emulsion and a viscosity regulator are added and stirred evenly to obtain an aqueous slurry. The aqueous slurry is coated on a PET release film by a roller coating device, and is dried in a 100-120°C oven at high temperature to obtain a covering agent layer after removing moisture.

[0096] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive, which is evenly coated on the above-mentioned concealing agent layer by a stainless steel mesh roller, and is dried in a 90-110°C oven at high temperature to remove moisture, thereby obtaining a correction tape core in which a concealing agent film layer and an adhesive film layer are sequentially stacked on a PET release film.

[0097] Comparative Example 3

[0098] The present embodiment provides a correction tape core, comprising a frosted peeling layer with a thickness of 15 μm, a covering agent layer with a thickness of 20 μm, and an adhesive layer with a thickness of 2 μm, which are arranged in sequence.

[0099] The frosted peeling layer is a frosted PET release film, and its inner peeling force is 15-20g / 25mm, and its outer peeling force is 8-13g / 25mm.

[0100] The covering layer formula is as follows by weight:

[0101]

[0102] Viscosity modifier 0.5 parts sodium carboxymethyl cellulose

[0103] Surfactant 0.7 parts Silane coupling agent

[0104] 0.2 parts nonionic surfactant

[0105] Light-resistant agent 0.6 parts 4,4'-dihydroxybenzophenone

[0106] At room temperature, low-reflective pigments, fillers, and surfactants are dispersed in deionized water by a high-speed disperser to obtain titanium dioxide slurry. Aqueous emulsion and viscosity regulator are directly added to the titanium dioxide slurry and stirred evenly to obtain an aqueous slurry. The aqueous slurry is coated on a PET release film by a roller coating device, and then dried in an oven at 100-120°C at high temperature to obtain a covering agent layer after removing moisture.

[0107] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive, which is evenly coated on the above-mentioned concealing agent layer by a stainless steel mesh roller, and is dried in a 90-110°C oven at high temperature to remove moisture, thereby obtaining a correction tape core in which a concealing agent film layer and an adhesive film layer are sequentially stacked on a PET release film.

[0108] Comparative Example 4

[0109] The present embodiment provides a correction tape core, comprising a frosted peeling layer with a thickness of 15 μm, a covering agent layer with a thickness of 20 μm, and an adhesive layer with a thickness of 2 μm, which are arranged in sequence.

[0110] The frosted peeling layer is a frosted PET release film, and its inner peeling force is 15-20g / 25mm, and its outer peeling force is 8-13g / 25mm.

[0111] The covering layer formula is as follows by weight:

[0112] Solvent 64 parts Solvent

[0113] Rubber 3.5 parts EPDM

[0114] Rubber 1.5 parts styrene butadiene rubber

[0115] Low-reflective pigment 20 parts Low-reflective pigment (average particle size 4300nm)

[0116] Filler 10 parts titanium dioxide

[0117] Surfactant 0.7 parts Silane coupling agent

[0118] 0.2 parts anionic surfactant

[0119] Light-resistant agent 0.6 parts 4,4'-dihydroxybenzophenone

[0120] The ethylene-propylene rubber and styrene-butadiene rubber are dispersed in a solvent, heated to 90-100° C. to obtain a solution, and then low-reflective pigments, fillers, surfactants and light-resistant agents are added to the solution to obtain a mixture after uniform dispersion. The mixture is transferred to a grinding device for appropriate secondary grinding, and the particle size D50 of the white pigment is in the range of 350-450 nm to obtain an opacifier slurry. The opacifier slurry is coated on a PET release film by a roller coating device, and is dried in an oven at 90-110° C. to obtain an opacifier layer after removing the solvent.

[0121] The adhesive layer provided in this embodiment is a water-based acrylic pressure-sensitive adhesive, which is evenly coated on the above-mentioned concealing agent layer by a stainless steel mesh roller, and is dried in a 90-110°C oven at high temperature to remove moisture, thereby obtaining a correction tape core in which a concealing agent film layer and an adhesive film layer are sequentially stacked on a PET release film.

[0122] Test Case

[0123] 1. Sample

[0124] After being prepared according to Examples 1-3 and Comparative Examples 1-3, the tape core was cut into strips with a width of 5-6 mm and assembled into a correction tape shell (ACT52310, Shanghai Chenguang Stationery) to prepare correction tape samples.

[0125] 2. Test methods

[0126] 2.1 Coating adhesion performance

[0127] Use a coating tester to draw 3 lines of coating with a length of 100 mm and a spacing of 5 mm on each side. Then use an adhesion tester to draw 50 mm circles with a pressure of 130 g using black 0.3 mm and 0.5 mm gel pens. Draw circles in both directions at a speed of 1 circle / s and a paper translation speed of 2 mm / s.

[0128] The coating is considered excellent if it is intact and has no abnormal phenomena such as warping, cracking, peeling, etc.

[0129] The coating is judged as qualified if it is partially warped, cracked or peeled off;

[0130] If there are abnormal phenomena such as incomplete coating, warping, cracking, peeling, etc., it is judged as poor.

[0131] 2.2 Coating covering performance

[0132] Write the character "Yong" on A4 copy paper with black 0.3mm and 0.5mm gel pens, apply a pressure of ≤300g, and immediately perform single-layer coating for A4 paper copying.

[0133] If there are no traces left on the copier or fax, and the handwriting is completely unclear, it is judged as excellent;

[0134] If there are slight traces left on the copier or fax, and the handwriting is slightly visible, it is judged as qualified;

[0135] If there are obvious traces on the copier or fax, and the handwriting is completely clear, it is judged as poor.

[0136] 2.3 Coating re-writing performance

[0137] Write the character "Yong" on A4 copy paper with black 0.3mm and 0.5mm gel pens, apply a pressure of ≤300g, single-layer coat the correction tape on the handwriting, and then write the character "Yong" on the coating surface with black 0.3mm and 0.5mm gel pens, applying a pressure of ≤300g.

[0138] When coating on the handwriting and during re-writing, if the coating does not break, the handwriting does not spread, and there is no adhesion or clogging between the coating film and the pen tip, it is judged as excellent;

[0139] When coating on the handwriting and during re-writing, if the coating does not break, the handwriting does not spread, and there is slight adhesion or clogging between the coating film and the pen tip, it is judged as qualified;

[0140] When coating on the handwriting or during re-writing, if the coating breaks, the handwriting spreads, and there is adhesion or clogging between the coating film and the pen tip, it is judged as poor.

[0141] 2.4 Glossiness

[0142] Continuously single-layer coat the correction tape on A4 copy paper to form a rectangle of not less than 50*80mm for the coating (the overlapping width of adjacent two coatings shall not be greater than 1mm and there shall be no gap), and then use a multi-angle glossiness meter to measure the 60° glossiness.

[0143] A 60° glossiness of 75 GU or more can be called high gloss (also known as bright gloss);

[0144] A 60° glossiness of 50 to 75 GU can be called flat gloss;

[0145] A 60° glossiness of 10 to 50 GU can be called matte gloss;

[0146] A 60° glossiness of 10GU or less can be called matte.

[0147] 2.5 Odor sensory test

[0148] Apply a single layer of correction tape on A4 copy paper so that the coating forms a rectangle of no less than 50*80mm. The tester will put his nose close to the paper at a distance of about 5cm to conduct an odor sensory test.

[0149] 3. Test results

[0150] The test results are shown in Table 2, which show that the matte correction tape core provided by the present invention has good adhesion performance, hiding performance, writing performance and low gloss.

[0151] Table 2 Test results

[0152]

[0153]

[0154] In Comparative Example 1, the total amount of aqueous emulsion is small, and when the coating forms a dry film, the resin cannot completely wrap the pigment and filler, forming more microscopic pores, which affects the hiding performance and rewriting performance.

[0155] The pigment in Comparative Example 2 is rutile titanium dioxide that has not undergone low-reflection treatment, has a high glossiness, and the data is in the matte range.

[0156] The pigment in Comparative Example 3 is a low-reflective pigment that has not been reground, and the particles are too large, which affects the covering performance and rewriting performance of the coating.

[0157] In Comparative Example 4, the solvent is toluene. When heated during the production process, toluene vapor is generated. This vapor can form an explosive mixture with air, and the mixture can explode when the volume concentration is in a low range. In addition, long-term inhalation of low-concentration toluene vapor can cause chronic poisoning, loss of appetite, fatigue, leukopenia, and anemia.

[0158] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A water-based matte tape core for a water-based correction tape, the tape core comprising a tape core coating, the tape core coating comprising a peeling layer, a covering agent layer and an adhesive layer in sequence, characterized in that: The concealing agent layer is safe and harmless, and is prepared by an aqueous emulsion and a low-reflective pigment in an aqueous slurry.

2. The belt core according to claim 1, characterized in that: The aqueous slurry further comprises water, a filler, a viscosity modifier, a light stabilizer and a surfactant.

3. The belt core according to claim 2, characterized in that: The components of the aqueous slurry are composed of the following ingredients by weight: 16-19 parts, 19-22 parts or 22-25 parts of the aqueous emulsion; 29-35 parts, 35-41 parts or 41-47 parts of the low-reflective pigment; 0.2-0.5 parts, 0.5-0.8 parts or 0.8-1.1 parts of the viscosity modifier; 0.2-0.5 parts, 0.5-0.8 parts or 0.8-1.1 parts of the surfactant; 0.1 to 0.3 parts, 0.3 to 0.6 parts or 0.6 to 0.9 parts of the light stabilizer; 8 to 12 parts, 12 to 16 parts or 16 to 20 parts of the filler; The water is 26-29 parts, 29-32 parts or 32-35 parts.

4. The belt core according to claim 2, characterized in that: The components of the aqueous slurry include, by weight: 16-19 parts, 19-22 parts or 22-25 parts of the aqueous emulsion; 29-35 parts, 35-41 parts or 41-47 parts of the low-reflective pigment; 0.2-0.5 parts, 0.5-0.8 parts or 0.8-1.1 parts of the viscosity modifier; 0.2-0.5 parts, 0.5-0.8 parts or 0.8-1.1 parts of the surfactant; 0.1 to 0.3 parts, 0.3 to 0.6 parts or 0.6 to 0.9 parts of the light stabilizer; 8 to 12 parts, 12 to 16 parts or 16 to 20 parts of the filler; The water is 26-29 parts, 29-32 parts or 32-35 parts.

5. The belt core according to claim 4, characterized in that: The aqueous emulsion is one or more selected from pure acrylic emulsion, styrene acrylic emulsion, silicone acrylic emulsion, and styrene-butadiene emulsion; The non-volatile component content of the aqueous emulsion is 44-48%, 48-52% or 52-56%.

6. The belt core according to claim 4, characterized in that: The low-reflective pigment is a porous white pigment in which an inorganic matte pigment and a titanium dioxide pigment core are wrapped by an inorganic binder, wherein the mass ratio of the inorganic binder to the titanium dioxide pigment core is 15:85-20:80, 20:80-25:75 or 25:75-30:70; The inorganic matting pigment is calcium carbonate particles or silicon dioxide particles, the average particle size of the inorganic matting pigment is 0.10-0.17, 0.17-0.24 or 0.24-0.31 μm, and the average particle size of the titanium dioxide pigment core is 0.20-0.27, 0.27-0.34, 0.34-0.41, 0.41-0.48 or 0.48-0.55 μm.

7. The belt core according to claim 4, characterized in that: The filler is one or more selected from calcium carbonate, calcium sulfate, silicon dioxide, and titanium dioxide; The viscosity modifier is one or more selected from polyurethane, xanthan gum, and cellulose; The surfactant is one or more selected from nonionic surfactants and anionic surfactants.

8. The belt core according to claim 1, characterized in that: The opacifier layer has a 60° glossiness lower than 10 GU.

9. A water-based correction tape, characterized in that: The invention comprises the aqueous matte tape core of the aqueous correction tape as claimed in any one of claims 1 to 8.

10. A method for preparing a water-based matte tape core for a water-based correction tape, characterized in that: The preparation method comprises: Z1: Preparation of initial low-reflective pigment; Z2: mixing water, low-reflective pigment, filler and surfactant at room temperature, and grinding to make the D50 particle size of the low-reflective pigment and the filler in the range of 300-500 nm to obtain titanium dioxide slurry; Z3: uniformly mixing the titanium dioxide slurry, aqueous emulsion and viscosity modifier at room temperature to obtain an aqueous slurry; Z4: coating the aqueous slurry on the peeling layer, and drying at a high temperature of 100-120° C. to obtain a covering agent layer; Z5: The water-based pressure-sensitive adhesive is evenly coated on the concealing agent layer, and after high-temperature drying at 90-110° C., the water-based matte tape core of the water-based correction tape is obtained.

11. The preparation method according to claim 10, characterized in that: Z1 is specifically: Z1-1: Disperse titanium dioxide pigment and inorganic matting pigment in water and mix with sodium silicate aqueous solution; Z1-2: heating and stirring the solution obtained in step Z1-1, mixing with aqueous sulfuric acid solution and adjusting the pH to 7.0-7.5, and letting stand; Z1-3: Filter the solution obtained in step Z1-2 and preliminarily grind the filtrate to obtain the initial low-reflective pigment.

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