CN114059389A - Direct-plating aluminum lining paper and preparation method thereof - Google Patents
Direct-plating aluminum lining paper and preparation method thereof Download PDFInfo
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- CN114059389A CN114059389A CN202010751926.XA CN202010751926A CN114059389A CN 114059389 A CN114059389 A CN 114059389A CN 202010751926 A CN202010751926 A CN 202010751926A CN 114059389 A CN114059389 A CN 114059389A
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- plating aluminum
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 46
- 238000007747 plating Methods 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 96
- 239000011248 coating agent Substances 0.000 claims abstract description 95
- 239000011122 softwood Substances 0.000 claims abstract description 33
- 238000001035 drying Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000011121 hardwood Substances 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000000945 filler Substances 0.000 claims abstract description 12
- 238000004537 pulping Methods 0.000 claims abstract description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 56
- 239000006185 dispersion Substances 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 38
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 28
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 22
- 239000004816 latex Substances 0.000 claims description 21
- 229920000126 latex Polymers 0.000 claims description 21
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 21
- 238000010009 beating Methods 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 239000000080 wetting agent Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 9
- 239000004411 aluminium Substances 0.000 claims 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 10
- 239000003973 paint Substances 0.000 description 10
- 239000000835 fiber Substances 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 3
- 238000005269 aluminizing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 235000014101 wine Nutrition 0.000 description 1
Images
Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/30—Multi-ply
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
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- Paper (AREA)
Abstract
The invention discloses direct-plating aluminum lining paper and a preparation method thereof. The preparation method of the direct plating aluminum lining paper comprises the following steps: respectively pulping softwood pulp and hardwood pulp, mixing, adding a filler, and sequentially defibering, papermaking, squeezing and drying to obtain lining paper base paper; the method has the advantages of simple process, easy operation and suitability for industrial production, and the prepared direct plating aluminum lining base paper has the advantages of low coating thickness, high smoothness and the like and has good application prospect.
Description
Technical Field
The invention relates to direct-plating aluminum lining paper and a preparation method thereof, belonging to the technical field of coating processing paper.
Background
The vacuum aluminum-plated paper is a green packaging material with excellent performance, and compared with the traditional aluminum foil composite paper, the vacuum aluminum-plated paper has the advantages of easy degradation, low production cost, good anti-counterfeiting performance, wide application range and the like. Nowadays, the packaging material is widely applied to high-grade packaging materials of cigarettes, wines, candies, medicines, cosmetics and the like in daily life of people.
The vacuum aluminum-plated paper can be divided into direct vacuum aluminum-plated paper and transfer vacuum aluminum-plated paper according to different preparation processes. In the preparation process of the traditional transfer vacuum aluminized paper, firstly aluminizing is carried out on a transfer film coated with a release agent, then a base paper and the transfer film are adhered together by using an adhesive, so that the aluminum film and the transfer film are peeled off and transferred to the base paper. The direct vacuum aluminum-plated paper is prepared by a method of coating and then plating aluminum on base paper meeting the requirements, does not use expensive transfer film materials which are difficult to recover and degrade, accords with the development idea of paying attention to environmental protection and resource saving at present, also meets the requirements of enterprises on reducing production cost and improving production efficiency, and is gradually developed as a research hotspot in the field.
The direct vacuum aluminum-plated paper consists of three parts, namely lining paper (comprising base paper and a coating) and an aluminum layer, wherein the base paper performance and the coating process have great influence on the quality of the aluminized product, and the direct vacuum aluminum-plated paper is a key technical bottleneck for the development of the direct vacuum aluminum-plated paper. The traditional direct-plating aluminum lining paper has the problems that the surface of an aluminum film is rough due to insufficient smoothness, or the thickness of a coating is too high, so that the product is not light and thin, and the like.
Disclosure of Invention
Aiming at the problems that the surface of an aluminum film is rough due to insufficient smoothness or the thickness of a coating is too high, so that the product is not light and thin and the like in the prior art, the invention aims to provide the direct-plated aluminum lining paper which is high in smoothness, low in coating thickness and excellent in mechanical property.
The second purpose of the invention is to provide a method for preparing the direct-plating aluminum lining paper, which has the advantages of simple operation, high efficiency, low cost, high smoothness, low coating thickness and the like.
In order to achieve the technical purpose, the invention provides a preparation method of direct plating aluminum lining paper, which comprises the following steps:
1) respectively pulping softwood pulp and hardwood pulp, mixing, adding a filler, and sequentially defibering, papermaking, squeezing and drying to obtain lining paper base paper;
2) sequentially coating a primary coating and a surface coating on the surface of the base paper of the inner lining paper; the prime coating and the top coating both comprise the components of styrene-acrylic latex, heavy calcium carbonate dispersion and china clay dispersion.
As a preferable scheme, the beating degree of the softwood pulp is 30-40 DEG SR.
As a preferable scheme, the beating degree of the hardwood pulp is 40-50 DEG SR.
The beating degree of softwood pulp and hardwood pulp adopted by the invention obviously influences the tensile strength of the aluminized liner paper. With the improvement of the beating degree of softwood pulp (long fiber), the tensile strength of the lining base paper shows a change trend of increasing first and then decreasing, when the beating degree of hardwood pulp (short fiber) is improved, the tensile strength of the lining base paper is also improved, but the overhigh beating degree increases the beating energy consumption. Therefore, the preferable beating degree of the softwood pulp is 30-40 DEG SR, and the preferable beating degree of the hardwood pulp is 40-50 DEG SR
As a preferable scheme, the mass ratio of the softwood pulp is 40-45%; the mass ratio of the hardwood pulp is 55-60%; the optimum mixing ratio of softwood pulp and hardwood pulp is 45% to 55%.
The proportion of the softwood pulp and the hardwood pulp adopted by the invention has obvious influence on the physical and mechanical properties of the aluminized liner paper, when the proportion of the softwood pulp (long fiber) is increased, the tensile strength of the base paper is also increased, but the tearing strength of the base paper is reduced, the tensile strength and tearing strength factors are comprehensively considered, and the proportion of the softwood pulp is preferably 40-45%.
As a preferred embodiment, the filler is ground calcium carbonate.
Preferably, the filler accounts for 5-10% of the mass of the base paper of the lining paper.
As a preferable scheme, the basis weight of the lining paper base paper is 43-45 g/m2。
As a preferable scheme, the conditions of the untwining are as follows: under the condition of rotating speed of 3000-4000 rpm, defibering for 5-8 min. As a preferred scheme, the pressing conditions are as follows: squeezing for 5-10 min under the pressure of 5-10 MPa.
As a preferred embodiment, the drying conditions are: drying for 6-10 min at the temperature of 95-100 ℃.
As a preferred scheme, the base coating comprises the following components in percentage by mass: 20-30% of styrene-acrylic latex;
30-50% of heavy calcium carbonate dispersion liquid; 30-50% of porcelain clay dispersion liquid; wherein the solid contents of the styrene-acrylic latex, the heavy calcium carbonate dispersion liquid and the china clay dispersion liquid are all 40-50%.
As a preferred embodiment, the undercoat paint contains a leveling agent (Silok-8255, St. Guangzhou, Storocco high molecular Polymer Co., Ltd.) and a wetting agent (Silok-8241, St. Guangzhou, St. Stoco high molecular Polymer Co., Ltd.).
As a further preferable scheme, the leveling agent accounts for 3-7 per mill of the mass of the bottom coating.
As a further preferable scheme, the wetting agent accounts for 0.5-0.7 per mill of the mass of the base coating.
Preferably, the coating weight of the priming paint on the surface of the inner lining paper base paper is 5-8 g/m2。
As a preferred scheme, the top coating comprises the following components in percentage by mass: 20-30% of styrene-acrylic latex;
30-50% of heavy calcium carbonate dispersion liquid; 30-50% of porcelain clay dispersion liquid; wherein the solid contents of the styrene-acrylic latex, the heavy calcium carbonate dispersion liquid and the china clay dispersion liquid are all 40-50%.
As a preferred embodiment, the topcoat material contains auxiliaries, including levelling agents and wetting agents.
As a further preferable scheme, the leveling agent accounts for 3-7 per mill of the mass of the top coating.
As a further preferred scheme, the wetting agent accounts for 0.5-0.7 per mill of the mass of the top coating.
Preferably, the coating amount of the top coating on the surface of the inner lining paper base paper is 5-8 g/m2。
The prime coat paint and the surface coat paint are prepared by highly dispersing styrene-acrylic latex, heavy calcium carbonate dispersion liquid, porcelain clay dispersion liquid and the like under the condition of high-speed stirring, for example, dispersing for 2-5 min at 5000 r/min.
The invention is realized by adopting a scraper type coating machine or a roller type coating machine to coat the primary coating and the surface coating on the surface of the lining paper base paper.
The drying conditions of the coating of the invention on the coating of the primary coating and the surface coating are as follows: drying at 95 ℃ for 3-5 min.
The invention also provides direct-plating aluminum lining paper which is obtained by the preparation method.
Compared with the prior art, the technical scheme of the invention has the beneficial technical effects that:
(1) according to the invention, the lining paper base paper is obtained by mixing and papermaking softwood pulp and hardwood pulp, so that the size of pores on the paper surface can be reduced while the strength of the paper is ensured, and the spreading of the coating on the paper surface is facilitated.
(2) The direct-plating aluminum lining paper obtained by two times of low-quantitative coating has higher smoothness and printability and lower coating thickness.
(3) The direct aluminum plating lining paper provided by the invention has the advantages of simple preparation process, short production period and good application prospect.
Drawings
FIG. 1 is a graph showing the relationship between the proportion of softwood and hardwood pulp used in the preparation of lining base papers of examples 1 and 6 and comparative example 1, and the tensile strength and tear strength;
FIG. 2 is a graph showing the relationship between the freeness and tensile strength of softwood and hardwood pulps used for the preparation of lining base papers in examples 7 and 8 and comparative examples 2 and 3.
Detailed Description
The present invention is described in further detail with reference to examples, but the scope of the claims of the present invention is not limited thereto.
Example 1
Pulping softwood pulp and hardwood pulp to 30-degree SR and 40-degree SR respectively, mixing according to the proportion of 45:55, adding heavy calcium carbonate filler accounting for 5% of the base paper weight, and then defibering in a defibering machine for 5min at the defibering rotating speed of 3000 rpm. The fluffed pulp is made into a quantitative of 43g/m2Pressing the paper sheet under the pressure of 5MPa for 5min, and drying at the temperature of 95 ℃ for 8min to obtain uncoated base paper of the lining paper. Mixing styrene-acrylic latex with solid content of 45%, heavy calcium carbonate dispersion liquid and china clay dispersion liquid according to the proportion of 2:3:5, respectively adding a leveling agent Silok-8255 accounting for 3 per mill of the total mass of the coating and a wetting agent Silok-8241 accounting for 0.5 per mill of the total mass of the coating, and dispersing for 3min at the rotating speed of 5000rpm to obtain the base coating. The top-coating paint is prepared according to the same method, except that the mixing ratio of the styrene-acrylic latex, the ground calcium carbonate dispersion liquid and the china clay dispersion liquid is 2:5: 3. Sequentially coating the primary coating and the surface coating on lining base paper by using a scraper type coating machine, and drying, wherein the coating weight is 5g/m2And 4g/m2And drying at 95 ℃ for 3min under the drying conditions to obtain the direct-plated aluminum lining paper.
Example 2
Pulping softwood pulp and hardwood pulp to 30-degree SR and 40-degree SR respectively, mixing according to the proportion of 45:55, adding heavy calcium carbonate filler accounting for 5% of the base paper weight, and then defibering in a defibering machine for 5min at the defibering rotating speed of 3000 rpm. The fluffed pulp is made into a quantitative of 43g/m2Pressing the paper sheet under the pressure of 5MPa for 5min, and drying at the temperature of 95 ℃ for 8min to obtain uncoated base paper of the lining paper. Mixing styrene-acrylic latex with solid content of 45%, heavy calcium carbonate dispersion liquid and china clay dispersion liquid according to a ratio of 2:4:4, respectively adding a leveling agent accounting for 3 thousandths of the total mass of the coating and a wetting agent accounting for 0.5 thousandths of the total mass of the coating, and dispersing for 3min at a rotating speed of 5000rpm to obtain the base coating. The top-coating paint is prepared according to the same method, except that the mixing ratio of the styrene-acrylic latex, the ground calcium carbonate dispersion liquid and the china clay dispersion liquid is 2:5: 3. Using a doctor blade for coatingSequentially coating the primary coating and the surface coating on lining base paper by a cloth machine, and drying, wherein the coating weights are respectively 5g/m2And 4g/m2And drying at 95 ℃ for 3min under the drying conditions to obtain the direct-plated aluminum lining paper.
Example 3
Pulping softwood pulp and hardwood pulp to 30-degree SR and 40-degree SR respectively, mixing according to the proportion of 45:55, adding heavy calcium carbonate filler accounting for 5% of the base paper weight, and then defibering in a defibering machine for 5min at the defibering rotating speed of 3000 rpm. The fluffed pulp is made into a quantitative of 43g/m2Pressing the paper sheet under the pressure of 5MPa for 5min, and drying at the temperature of 95 ℃ for 8min to obtain uncoated base paper of the lining paper. Mixing styrene-acrylic latex with solid content of 45%, heavy calcium carbonate dispersion liquid and china clay dispersion liquid according to the proportion of 2:5:3, respectively adding a leveling agent accounting for 3 thousandths of the total mass of the coating and a wetting agent accounting for 0.5 thousandths of the total mass of the coating, and dispersing for 3min at the rotating speed of 5000rpm to obtain the base coating. The top-coating paint is prepared according to the same method, except that the mixing ratio of the styrene-acrylic latex, the ground calcium carbonate dispersion liquid and the china clay dispersion liquid is 2:5: 3. Sequentially coating the primary coating and the surface coating on lining base paper by using a scraper type coating machine, and drying, wherein the coating weight is 5g/m2And 4g/m2And drying at 95 ℃ for 3min under the drying conditions to obtain the direct-plated aluminum lining paper.
Example 4
Pulping softwood pulp and hardwood pulp to 30-degree SR and 40-degree SR respectively, mixing according to the proportion of 45:55, adding heavy calcium carbonate filler accounting for 5% of the base paper weight, and then defibering in a defibering machine for 5min at the defibering rotating speed of 3000 rpm. The fluffed pulp is made into a quantitative of 43g/m2Pressing the paper sheet under the pressure of 5MPa for 5min, and drying at the temperature of 95 ℃ for 8min to obtain uncoated base paper of the lining paper. Mixing styrene-acrylic latex with solid content of 45%, heavy calcium carbonate dispersion liquid and china clay dispersion liquid according to the proportion of 2:3:5, respectively adding a leveling agent accounting for 3 thousandths of the total mass of the coating and a wetting agent accounting for 0.5 thousandths of the total mass of the coating, and dispersing for 3min at the rotating speed of 5000rpm to obtain the base coating. The top-coating paint is prepared according to the same method, except that the mixing ratio of the styrene-acrylic latex, the ground calcium carbonate dispersion liquid and the china clay dispersion liquid is 2:4: 4. Use ofSequentially coating the primary coating and the surface coating on lining base paper by a scraper type coating machine, and drying, wherein the coating weight is 5g/m2And 4g/m2And drying at 95 ℃ for 3min under the drying conditions to obtain the direct-plated aluminum lining paper.
Example 5
Pulping softwood pulp and hardwood pulp to 30-degree SR and 40-degree SR respectively, mixing according to the proportion of 45:55, adding heavy calcium carbonate filler accounting for 5% of the base paper weight, and then defibering in a defibering machine for 5min at the defibering rotating speed of 3000 rpm. The fluffed pulp is made into a quantitative of 43g/m2Pressing the paper sheet under the pressure of 5MPa for 5min, and drying at the temperature of 95 ℃ for 8min to obtain uncoated base paper of the lining paper. Mixing styrene-acrylic latex with solid content of 45%, heavy calcium carbonate dispersion liquid and china clay dispersion liquid according to the proportion of 2:3:5, respectively adding a leveling agent accounting for 3 thousandths of the total mass of the coating and a wetting agent accounting for 0.5 thousandths of the total mass of the coating, and dispersing for 3min at the rotating speed of 5000rpm to obtain the base coating. The top-coating paint is prepared according to the same method, except that the mixing ratio of the styrene-acrylic latex, the ground calcium carbonate dispersion liquid and the china clay dispersion liquid is 2:5: 3. Sequentially coating the primary coating and the surface coating on lining base paper by using a scraper type coating machine, and drying, wherein the coating weight is 5g/m2And 4g/m2And drying at 95 ℃ for 3min under the drying conditions to obtain the direct-plated aluminum lining paper.
Example 6
This example refers to the preparation method of example 1 except that the softwood pulp ratio is 40%.
Example 7
This example refers to the preparation method of example 1 except that the softwood pulp freeness is 40 ° SR.
Example 8
This example refers to the preparation method of example 1 except that the hardwood pulp freeness is 50 ° SR.
Comparative example 1
This comparative example refers to the preparation method of example 1 except that the softwood pulp ratio is 30%, 50%, 55%.
Comparative example 2
This example refers to the preparation method of example 1 except that the softwood pulp freeness is 20 ° SR, 50 ° SR, 60 ° SR.
Comparative example 3
This example refers to the preparation method of example 1 except that hardwood pulp freeness is 20 ° SR, 30 ° SR, 60 ° SR.
Effects of the embodiment
1. The direct plating aluminum lining paper prepared in examples 1 to 5 was subjected to moisture equilibrium in a constant temperature and humidity chamber, and then measured for thickness and smoothness by an L & W paper thickness meter and a keisk smoothness meter, respectively, and the results are shown in table 1.
TABLE 1 direct aluminizing liner paper Performance test results
It can be seen that as the proportion of the porcelain clay dispersion in the undercoat and topcoat paints increases, the coating thickness of the direct aluminum plating interlining paper does not vary greatly and the smoothness improves significantly, and in preferred example 1, the thickness and smoothness are 13 μm and 505s, respectively.
2. The tensile strength and tear strength of the lining base papers prepared in examples 1 and 6 and comparative example 1 were measured as shown in fig. 1.
The results show that: the direct-plating aluminum lining base paper prepared by the invention has good physical and mechanical properties, and when the proportion of softwood pulp (long fibers) is increased from 35% to 55%, the tensile strength of the base paper is increased from 2.29kN/m to 2.56kN/m, and is increased by about 11.8%. Meanwhile, the tearability of the base paper is reduced from 648mN to 455mN, which is reduced by about 29.8%. In comparative example 1, when the softwood pulp ratio is 35%, the tensile strength of the prepared base paper is low; in comparative example 1, when the ratio of softwood pulp was 50% and 55%, the tear of the base paper prepared therefrom was low. Therefore, the preferred proportion of softwood pulp in the invention is 40-45%.
3. The tensile strength of the lining base papers prepared in examples 7 and 8 and comparative examples 2 and 3 was measured as shown in fig. 2.
The results show that: the lining base paper prepared by the optimized beating degree of the softwood pulp and the hardwood pulp has better physical properties. With the improvement of the beating degree of the softwood pulp (long fibers), the tensile strength of the lining base paper shows a change trend of increasing first and then decreasing, and when the beating degree is improved from 20 DEG SR to 40 DEG SR, the tensile strength of the lining base paper is improved from 1.97kN/m to 2.30kN/m and is increased by about 16.8%; when the beating degree of hardwood pulp (short fiber) is increased from 20 DEG SR to 40 DEG SR, the tensile strength of the lining base paper is increased from 1.60kN/m to 2.21kN/m, and the increase is about 38.1%, but the overhigh beating degree is the increase of beating energy consumption, so the preferred beating degree of hardwood pulp in the invention is 40 DEG SR-50 DEG SR.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (19)
1. A preparation method of direct plating aluminum lining paper is characterized in that: the method comprises the following steps:
1) respectively pulping softwood pulp and hardwood pulp, mixing, adding a filler, and sequentially defibering, papermaking, squeezing and drying to obtain lining paper base paper;
2) sequentially coating a primary coating and a surface coating on the surface of the base paper of the inner lining paper; the prime coating and the top coating both comprise the components of styrene-acrylic latex, heavy calcium carbonate dispersion and china clay dispersion.
2. The method for preparing direct plating aluminum lining paper according to claim 1, characterized in that: the beating degree of the softwood pulp is 30-40 DEG SR.
3. The method for preparing direct plating aluminum lining paper according to claim 1, characterized in that: the beating degree of the softwood pulp is 40-50 DEG SR.
4. The method for preparing direct plating aluminum lining paper according to any one of claims 1 to 3, characterized in that: the mass ratio of the softwood pulp to the hardwood pulp is 40-45% to 55-60%.
5. The method for preparing direct plating aluminum lining paper according to claim 1, characterized in that: the filler is heavy calcium carbonate.
6. The method for preparing a direct aluminum plating lining paper according to claim 1 or 5, characterized in that: the filler accounts for 5-10% of the base paper of the lining paper by mass.
7. The method for preparing direct plating aluminum lining paper according to claim 1, characterized in that: the basis weight of the base paper of the lining paper is 43-45 g/m2。
8. The method for preparing direct plating aluminum lining paper according to claim 1, characterized in that: the conditions of the defibering are as follows: under the condition of rotating speed of 3000-4000 rpm, defibering for 5-8 min.
9. The method for preparing direct plating aluminum lining paper according to claim 1, characterized in that: the squeezing conditions are as follows: squeezing for 5-10 min under the pressure of 5-10 MPa.
10. The method for preparing direct plating aluminum lining paper according to claim 1, characterized in that: the drying conditions are as follows: drying for 6-10 min at the temperature of 95-100 ℃.
11. The method for preparing direct plating aluminum lining paper according to claim 1, characterized in that: the base coating comprises the following components in percentage by mass:
20-30% of styrene-acrylic latex;
30-50% of heavy calcium carbonate dispersion liquid;
30-50% of porcelain clay dispersion liquid;
wherein the solid contents of the styrene-acrylic latex, the heavy calcium carbonate dispersion liquid and the china clay dispersion liquid are all 40-50%.
12. The method for preparing direct plating aluminum lining paper according to claim 11, characterized in that: the base coating comprises assistants including a leveling agent and a wetting agent.
13. The method for preparing direct plating aluminum lining paper according to claim 11, characterized in that:
the leveling agent accounts for 3-7 per mill of the mass of the primary coating;
the wetting agent accounts for 0.5-0.7 per mill of the mass of the base coating.
14. The method for preparing direct plating aluminum lining paper according to claim 1, 11, 12 or 13, characterized in that: the coating weight of the primary coating on the surface of the body paper of the inner lining paper is 5-8 g/m2。
15. The method for preparing direct plating aluminum lining paper according to claim 1, characterized in that: the top coating comprises the following components in percentage by mass:
20-30% of styrene-acrylic latex;
30-50% of heavy calcium carbonate dispersion liquid;
30-50% of porcelain clay dispersion liquid;
wherein the solid contents of the styrene-acrylic latex, the heavy calcium carbonate dispersion liquid and the china clay dispersion liquid are all 40-50%.
16. The method for preparing direct plating aluminum lining paper according to claim 15, characterized in that: the topcoat coating contains auxiliaries including levelling agents and wetting agents.
17. The method for preparing a direct aluminum plating lining paper according to claim 16, wherein:
the leveling agent accounts for 3-7 per mill of the mass of the top coating;
the wetting agent accounts for 0.5-0.7 per mill of the mass of the topcoat coating.
18. The method for preparing direct plating aluminum lining paper according to claim 1, 15, 16 or 17, characterized in that: the coating weight of the surface coating on the surface of the body paper of the inner lining paper is 5-8 g/m2。
19. The utility model provides a slip sheet in direct plating aluminium which characterized in that: the preparation method of any one of claims 1 to 18.
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