CN112144315A - Pre-coating for blueprint paper and preparation method thereof - Google Patents

Pre-coating for blueprint paper and preparation method thereof Download PDF

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Publication number
CN112144315A
CN112144315A CN202011028946.0A CN202011028946A CN112144315A CN 112144315 A CN112144315 A CN 112144315A CN 202011028946 A CN202011028946 A CN 202011028946A CN 112144315 A CN112144315 A CN 112144315A
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water
coating
parts
adhesive
blueprint
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徐波
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Hangzhou Dongyi Paper Co ltd
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Hangzhou Dongyi Paper Co ltd
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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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/12—Defoamers
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/28—Colorants ; Pigments or opacifying agents

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Abstract

The invention discloses a pre-coating for blueprint paper and a preparation method thereof. The blueprint paper pre-coating comprises the following components in percentage by weight: 3-5% of silicon dioxide; 4-6% of adhesive; 0.05 to 0.3 percent of defoaming agent solution; 1.5-2% of toning solution; the water for the pre-coating is the rest; the adhesive comprises the following components in parts by weight: 100 parts of base resin; 8-15 parts of water for adhesives; 5-8 parts of titanium dioxide; the base resin is at least one of acrylic emulsion and polyurethane emulsion. The blueprint paper precoating material can be used for precoating the surface of the blueprint paper base paper, and has the advantages of reinforcing the surface of the base paper to form a flat surface layer and improving the auxiliary effect on the developing speed.

Description

Pre-coating for blueprint paper and preparation method thereof
Technical Field
The invention relates to the field of a pre-coating for a blueprint paper, in particular to a pre-coating for a blueprint paper and a preparation method thereof.
Background
Blueprint paper is commonly called blue paper, is a chemical coating processing paper, is specially used for various engineering designs and machine-made blueprints, and is an essential article for production, scientific research and construction. The dry blueprint paper is produced mostly in China, and the photosensitive substance of the dry blueprint paper is biphenyl organic substance, is sensitive to light and is decomposed under illumination.
The common process production flow of the blueprint paper is as follows: and sequentially coating a pre-coating and a coating on the base paper. The precoating can form a coating on the surface of the base paper, so that the possibility that ultraviolet rays enter the base paper and are difficult to reflect to the coating is reduced, the performance of the blueprint paper is improved, the density of lines is improved at the same photosensitive speed, or the photosensitive speed is improved at the same line density.
Chinese patent publication No. CN101639622A, published as 2010, 2/3, discloses a method for manufacturing a thin photosensitive blueprint paper, which discloses a precoating material comprising 50 liters of water, 2 to 5kg of fumed silica or modified starch, 5 to 10 liters of acrylic resin emulsion or acrylate-polyvinyl acetate copolymer, ammonia water for adjusting the PH to 6 to 8, and water for making the total volume 100 liters.
Among the above-mentioned prior art, the precoating material is as blockking up the coating on body paper surface, reduces the ultraviolet ray at the physical aspect and gets into the body paper to reach the effect that improves blueprint paper performance, and suitable precoating material formula can play better auxiliary effect to blueprint paper performance.
Disclosure of Invention
In view of the deficiencies of the prior art, it is a first object of the present invention to provide a blueprint paper pre-coating which has the advantage of increasing the development speed.
A second object of the present invention is to provide a process for the preparation of a pre-coating for blueprint paper which has the advantage of obtaining a uniform and stable pre-coating.
In order to achieve the first object, the invention provides the following technical scheme: a blueprint paper pre-coating comprises the following components in percentage by weight:
3-5% of silicon dioxide;
4-6% of adhesive;
0.05 to 0.3 percent of defoaming agent solution;
1.5-2% of toning solution;
the balance of water;
the adhesive comprises the following components in parts by weight:
100 parts of base resin;
5-8 parts of titanium dioxide;
the base resin is at least one of acrylic emulsion and polyurethane emulsion.
With the above technical solution, silica is a stable solid, and is commonly used as a filler and a colorant. The adhesive is used for bonding and coating the precoating layer on the surface of the base paper, and a flat surface layer is provided for coating the coating layer. The defoaming agent solution can reduce bubbles of the raw materials during mixing and ensure the uniformity and stability of the pre-coating.
The binder comprises a base resin and titanium dioxide. In the base resin, the acrylic emulsion is a water-based acrylic resin, and is cured at room temperature by volatilization of a solvent to form a soft cured layer. The polyurethane emulsion is also an aqueous resin, can be dissolved and dispersed in water, and can obtain a resin cured layer with good flexibility after the polyurethane is cured. In addition, the acrylic resin has good self-leveling property, so that the pre-coating can form good flatness on the surface of the base paper, a good flatness base is provided for coating of the coating, and the quality of the blueprint paper is improved. The base paper contains a large amount of cellulose, and when the surface of the base paper is coated with the pre-coating, hydroxyl on the cellulose is easy to form hydrogen bonds with water, so that the movement and permeation of water molecules and resin molecules to the direction of the base paper are promoted, the surface of the base paper is reinforced, and a flat surface layer is formed at the same time.
Titanium dioxide is a white inorganic pigment having ultraviolet-shielding properties. When the blueprint paper is printed by using ultraviolet light, the possibility of ultraviolet light entering the raw paper layer can be greatly reduced by using the coating layer, so that the exposure time is shortened; on the other hand, the titanium dioxide in the precoating layer can reflect and refract the ultraviolet rays reaching the coating layer to the coating layer again, so that the exposure time is further shortened, and the auxiliary effect of the precoating layer on the development of the blueprint paper is improved.
Further, the paint comprises the following components in percentage by weight:
3% of silicon dioxide;
5% of a binder;
0.2% of defoaming agent solution;
1.8% of toning solution;
the water for the pre-coating is the rest;
the adhesive comprises the following components in parts by weight:
100 parts of base resin;
7.5 parts of titanium dioxide;
the base resin is at least one of acrylic emulsion and polyurethane emulsion;
the defoaming agent solution is obtained by diluting a defoaming agent with water by a multiple of 1: 100;
the toning solution is obtained by diluting a pigment by a factor of 1:20 with water.
By adopting the technical scheme, experiments show that the precoating material with the formula can obtain good developing speed and bonding strength between the base paper and the coating layer.
Further, the adhesive also comprises 6-11 parts of carboxymethyl cellulose.
By adopting the technical scheme, the carboxymethyl cellulose belongs to polysaccharide, has a large amount of hydroxyl, can form a colloidal solution after being dissolved in water, realizes water retention, delays water molecule volatilization and provides sufficient time for leveling of the base resin.
Further, the adhesive also comprises starch, and the mass part ratio of the starch to the carboxymethyl cellulose is (0.1-0.3): 1.
by adopting the technical scheme, the starch is a macromolecular polymer formed by polymerizing glucose molecules, and can form a viscous colloidal solution by water absorption and expansion. When the starch and the carboxymethyl cellulose are used simultaneously, the viscosity of the whole precoating material can be adjusted, water molecules are adsorbed simultaneously, water retention is realized, and the drying time is prolonged to provide sufficient leveling time for the precoating material. In addition, the hydrophilicity of the carboxymethyl cellulose and the starch is very good, after the starch absorbs water and expands, the carboxymethyl cellulose can protect starch colloid, meanwhile, along with the penetration of the pre-coating to the base paper, the carboxymethyl cellulose enters between the molecules of the base paper cellulose, the starch colloid is adhered to the surface of the base paper, and the leveling effect of the pre-coating is matched to fill the starch colloid in the concave part of the surface of the base paper, so that the flatness of the pre-coating is further improved.
Further, the adhesive also comprises 1-5 parts of silane coupling agent.
By adopting the technical scheme, the silane coupling agent can effectively treat the organic phase and the inorganic phase, thereby increasing the bonding strength with the organic phase, improving the bonding strength of titanium dioxide in a coating layer and reducing the influence of the titanium dioxide on the strength of the cured resin.
Further, the base resin is prepared from the following components in parts by mass of 1: (0.55-0.7) acrylic emulsion and polyurethane emulsion.
By adopting the technical scheme, after the acrylic resin and the polyurethane resin are matched, a flexible precoating layer can be obtained, the low temperature resistance is improved, and the defects of hot sticking and cold brittleness of the acrylic resin are overcome; the self-leveling performance of the precoating layer is ensured while the excellent coating layer is obtained.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of a pre-coating for a blueprint paper comprises the following steps:
s1: uniformly mixing all raw materials of the adhesive at the temperature of 20-38 ℃ to obtain the adhesive;
s2: adding one third of the total amount of water for the pre-coating, adding silicon dioxide, and after the silicon dioxide naturally sinks to the bottom, dispersing at a high speed of 1000-; after the stirring speed is adjusted to 150-300r/min, adding the residual precoating material into water during the low-speed stirring;
s3: after the water is completely added to the precoating material, adding the adhesive under the condition of keeping the stirring speed of 150-300r/min, stirring and mixing for 18-25min, then adding the toning solution, stirring and mixing for 8-13 min, continuously adding the defoaming agent solution under the condition of keeping stirring, and finishing the addition of the defoaming agent solution within 5-10 min.
By adopting the technical scheme, the uniform and stable pre-coating is obtained.
Further, in step S1, starch is first added to the water for the adhesive, and after mixing, carboxymethyl cellulose is then added, and finally the remaining adhesive raw material is added.
By adopting the technical scheme, the starch and the water are mixed and gelatinized to form a colloid, the carboxymethyl cellulose is added, the carboxymethyl cellulose is dissolved in the water to realize the protection of the starch colloid, and in the process of leveling the precoating material, the starch colloid, the carboxymethyl cellulose and the water close to the blueprint base paper and form hydrogen bond combination with the blueprint base paper cellulose, so that the combination strength with the blueprint paper is improved.
In conclusion, the invention has the following beneficial effects:
1. according to the invention, titanium dioxide is preferably adopted, and the titanium dioxide in the precoating layer can reflect and refract ultraviolet rays reaching the coating layer to the coating layer again, so that the exposure time is further shortened, and the auxiliary effect of the precoating layer on the development of the blueprint paper is improved.
2. According to the invention, starch and carboxymethyl cellulose are preferably adopted, after the starch absorbs water and expands, the carboxymethyl cellulose can form protection on starch colloid, and simultaneously along with the penetration of the pre-coating to the base paper, the carboxymethyl cellulose enters between the molecules of the base paper cellulose, the starch colloid is adhered to the surface of the base paper, and the starch colloid is filled in the concave part of the surface of the base paper by matching with the leveling action of the pre-coating, so that the flatness of the pre-coating is further improved.
3. The invention preferably adopts the silane coupling agent which can effectively treat the organic phase and the inorganic phase, thereby increasing the bonding strength with the organic phase, improving the bonding strength of the titanium dioxide in the coating layer and reducing the influence of the titanium dioxide on the strength of the cured resin.
Detailed Description
Examples 1 to 12: examples 1-4 include components and corresponding masses shown in table 1.1, and examples 5-12 include components and corresponding masses the same as example 4; the components, specific compositions and corresponding masses of the binders in the precoats of examples 1 to 6 are shown in Table 1.2, and the components and corresponding masses of the binders in the precoats of examples 7 to 12 are shown in Table 1.3. The pre-coating is prepared by the following steps:
s1: preparation of the adhesive: adding starch and adhesive into a first material barrel with water, stirring at a temperature of 20 ℃ at a stirring speed of 100r/min for 5min, adding carboxymethyl cellulose under stirring, continuing stirring for 5min, adding the rest adhesive raw material, increasing the stirring speed to 500r/min, and stirring for 5min to obtain the adhesive;
s2: adding one third of the total amount of water for the pre-coating into a second material barrel, adding silicon dioxide, and after the silicon dioxide naturally sinks to the bottom of the water, dispersing at a high speed of 1150r/min for 120 min; after the stirring speed is adjusted to 200r/min, adding the residual precoating material into water;
s3: and after the precoating material is completely added with water, adding the adhesive at a stirring speed of 200r/min, stirring and mixing for 20min, adding the toning solution, stirring and mixing for 10min, continuously adding the defoaming agent solution under the condition of keeping stirring, and finishing the uniform addition of the defoaming agent solution within 10 min.
TABLE 1.1 precoat composition and corresponding mass (kg) in examples 1-4
Figure BDA0002701411940000051
TABLE 1.2 Binder Components and corresponding masses (kg) of examples 1-6
Figure BDA0002701411940000052
Figure BDA0002701411940000061
TABLE 1.3 Binder Components and corresponding masses (kg) of examples 7-12
Figure BDA0002701411940000062
In the embodiment, the defoaming agent solution is obtained by diluting a defoaming agent by water by a factor of 1:100, and the defoaming agent is collected from Changsha huidao; the tinting solution was obtained by diluting the lake blue pigment with water at a factor of 1: 20.
Example 13: a preparation method of a pre-coating material for a blueprint paper comprises the following steps:
s1: preparation of the adhesive: adding starch and adhesive into a first material barrel with water, stirring at a stirring speed of 100r/min for 5min at a temperature of 38 ℃, adding carboxymethyl cellulose under stirring, continuing stirring for 5min, adding the rest adhesive raw material, increasing the stirring speed to 500r/min, and stirring for 5min to obtain the adhesive;
s2: adding one third of the total amount of water for the pre-coating into a second material barrel, adding silicon dioxide, and after the silicon dioxide naturally sinks to the bottom of the water, dispersing at a high speed of 1000r/min for 150 min; after the stirring speed is adjusted to 150r/min, adding the residual precoating material into water;
s3: and after the precoating material is completely added with water, adding the adhesive under the condition of keeping the stirring speed of 150r/min, stirring and mixing for 25min, adding the toning solution, stirring and mixing for 8min, continuously adding the defoaming agent solution under the condition of keeping stirring, and finishing the uniform addition of the defoaming agent solution within 5 min.
Example 14: a preparation method of a pre-coating material for a blueprint paper comprises the following steps:
s1: preparation of the adhesive: adding starch and adhesive into a first material barrel with water, stirring at a temperature of 35 ℃ at a stirring speed of 100r/min for 5min, adding carboxymethyl cellulose under stirring, continuing stirring for 5min, adding the rest adhesive raw material, increasing the stirring speed to 500r/min, and stirring for 5min to obtain the adhesive;
s2: adding one third of the total amount of water for the pre-coating into a second material barrel, adding silicon dioxide, and dispersing at high speed at 1200r/min for 100min after the silicon dioxide naturally sinks to the bottom of the water; adjusting the stirring speed to 100r/min, and adding the residual precoating material into water;
s3: and after the precoating material is completely added with water, adding the adhesive at a stirring speed of 300r/min, stirring and mixing for 18min, adding the toning solution, stirring and mixing for 13 min, continuously adding the defoaming agent solution under the condition of keeping stirring, and finishing the uniform addition of the defoaming agent solution within 8 min.
Example 15: a method for preparing a pre-coating material for a blueprint paper, which is different from the method in example 13, in step S1, all raw materials of an adhesive are put into a first barrel and stirred for 15min at a temperature of 38 ℃ and a stirring speed of 500r/min, so as to obtain the adhesive.
Comparative examples 1 to 3: a blueprint paper pre-coating differing from example 1 in that the binder comprises the components and the corresponding masses shown in table 2:
table 2 comparative examples 1-3 adhesive components, compositions and corresponding masses (kg)
Figure BDA0002701411940000071
Figure BDA0002701411940000081
Comparative example 4: a pre-coating for blueprint paper is prepared from the pre-coating formula disclosed in the third embodiment with the publication number of CN101639622A and a preparation method.
Characterization experiment:
1. development speed test
Subject: examples 1-12 and comparative examples 1-4, for a total of 16 experimental samples.
The experimental method comprises the following steps: preparation of 60g/m2The base paper for blueprint of (1) was used to prepare a pre-coating, a coating and a back-coating solution, the coating being composed of 388kg of water, 10kg of citric acid, 7kg of a stabilizer, 15kg of ethylene glycol, 15kg of diethylene glycol, 5kg of butoxymorpholine (FB) and 60kg of VBA (Changsha Huidai industries, Ltd.). The back coating liquid is obtained by dissolving 5kg of antistatic agent in 95kg of water, and the antistatic agent is sodium dodecyl sulfate. The base paper was coated with the precoating and the unified coating corresponding to examples 1 to 12 and comparative examples 1 to 4 in this order on one side and the back coating solution on the other side. The amount of the precoat applied was 0.5g/m2The coating amount of the coating material was 0.7g/m2The coating amount of the back coating liquid was 0.3g/m2。
And preparing a photosensitive box and a colorimetric card. The light sensitive box comprises a box body, wherein 20 fluorescent lamps of 1.2m are arranged in the box body in parallel, and the wattage of each fluorescent lamp is 10 w. The color card presents the developed color. Putting the blueprint paper into a photosensitive box in sequence, turning on a fluorescent lamp for 1s continuously, turning off the lamp after 1s, comparing the blueprint paper with a colorimetric card, and if the color of the blueprint paper does not reach the color same as that of the blueprint paper, continuing to increase the color for 1s until the color of the blueprint paper is the same as that of the colorimetric card, and determining the development time.
The experimental results are as follows: the development time test results are reported in table 3.
TABLE 3 development time test results
Figure BDA0002701411940000082
And (3) data analysis: as can be seen from the data above, the examples all exhibited a shorter development time than the comparative examples. In the examples, the exposure time was from short to long in the order of examples 9 to 12, examples 5 to 8, and examples 1 to 4.
Comparing with all the examples, the examples 5-8 after limiting the base resin proportion and increasing the carboxymethyl cellulose have faster developing speed compared with the examples 1-4, and the addition of the hydroxymethyl limiter can further reduce the ultraviolet rays entering the base paper, increase the quantity of the ultraviolet rays acting on the coating layer and improve the developing speed. In addition, after the starch and the carboxymethyl cellulose are added to be matched on the basis of the examples 5 to 8, the exposure time can be improved on the whole, and the auxiliary effect of the precoating material on the developing speed of the blueprint paper is greatly improved.
In comparative examples 1 to 3, however, comparative example 1, which did not use titanium oxide, lost the reflection and refraction effects of titanium oxide to ultraviolet rays, and its development time was lengthened. An unreasonable amount of the base resin and titanium dioxide blended does not achieve the effect of increasing the developing speed.
2. Strength test of blueprint paper
(1) Effect of precoat formulation on blueprint paper Strength
Subject: examples 1-12 and comparative examples 1-4, for a total of 16 experimental samples.
The experimental method comprises the following steps: preparation of 60g/m2The base blueprint paper of (1) to (12) and the precoating materials of (1) to (4) are respectively coated on the outer surface of the base blueprint paper, and the coating amount of the precoating material is 0.5g/m2. And (3) preparing an Elmendorf tearability tester and testing the tearability of the paper. Preparing 20(60 +/-0.5) × (50 +/-2) mm of parallel samples for each experimental sample, wherein each 4 samples form a group, and each experimental sample corresponds to five groups; the tearing strength mN is obtained by performing the test according to the tearing strength test method specified in GB/T455-2002.
The experimental results are as follows: the tear strength test results of the blueprint paper are reported in table 4.1.
TABLE 4.1 Effect of precoat formulation on blueprint paper Strength test results record
Figure BDA0002701411940000091
And (3) data analysis: as can be seen from the above table, the tearability was as follows from the large to the small in the order of examples 11 to 12, examples 9 to 10, examples 6 to 8, examples 1 to 5 and comparative examples 1 to 3, comparative example 4. The tear strength of the blueprint paper can reflect the auxiliary effect on the strength of the blueprint paper and the bonding strength with the blueprint paper after the pre-coating is coated on the blueprint base paper.
The tear strength of examples 1-5 was at the same level as that of comparative examples 1-3, indicating that the addition of titanium dioxide alone, and the use of titanium dioxide in combination with the base resin, had little effect on the adhesion of the precoat to the blueprint paper and on the strengthening effect of the blueprint base paper, but had a large effect on the exposure time. Examples 6 to 8 the silane coupling agent or the carboxymethyl cellulose was added to examples 1 to 5, the silane coupling agent improved the bonding between the organic phase and the inorganic phase in the precoating layer, and the carboxymethyl cellulose improved the auxiliary effect of the precoating layer on the strength of the blueprint base paper, thereby improving the strength of the precoating layer. Examples 9 to 10 are based on examples 6 to 8, and starch is added, and carboxymethyl cellulose protects colloid formed by starch and promotes the adhesion of the starch and the colloid with the blueprint raw paper cellulose, thereby improving the auxiliary effect of the precoat layer on the strength of the blueprint raw paper. Examples 11-12 examples 9-10 were combined with silane coupling agents to further improve the bonding of the organic and inorganic phases and thus improve the tear resistance of the blueprint base paper and precoat layers.
(2) Influence of the preparation method of the pre-coating on the strength of the blueprint paper experimental subject: example 12 corresponds to example 12 and examples 13-15 correspond to examples 13-15 obtained from the formulation of example 12 for a total of 4 experimental groups.
The experimental method comprises the following steps: the same experimental procedure as in (1) Effect of precoat formulation on blueprint paper Strength ".
The experimental results are as follows: the results of the test are reported in table 4.2 as the effect of the pre-coat preparation method on the strength of the blueprint paper.
TABLE 4.2 Effect of precoat preparation method on blueprint paper Strength test results record
Figure BDA0002701411940000101
And (3) data analysis: as can be seen from the above table, examples 12-14 had similar tear strength, while example 15 had a greater reduction in tear strength.
The difference of the implementation samples 12-14 is that the process parameters are changed, the physical state of the pre-coating raw materials after mixing is not essentially affected, the carboxymethyl cellulose in the implementation samples 12-14 protects the starch colloid, on one hand, water is locked to leave sufficient time for leveling of the pre-coating material, and on the other hand, in the process of leveling of the pre-coating material, the starch colloid, the carboxymethyl cellulose and water close to the blueprint base paper form hydrogen bond combination with the blueprint base paper cellulose, so that the combination strength with the blueprint paper is improved. Sample 15 had no slightly porous combination of hydroxymethylcellulose and starch, and did not have the effect of samples 12 to 14, and had poor tear strength.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (8)

1. The blueprint paper pre-coating is characterized by comprising the following components in percentage by weight:
3-5% of silicon dioxide;
4-6% of adhesive; 0.05 to 0.3 percent of defoaming agent solution;
1.5-2% of toning solution;
the water surplus of the precoating material is used;
the adhesive comprises the following components in parts by weight:
100 parts of base resin;
8-15 parts of water for adhesives;
5-8 parts of titanium dioxide;
the base resin is at least one of acrylic emulsion and polyurethane emulsion.
2. The blueprint paper pre-coating of claim 1, comprising, in weight percent:
3% of silicon dioxide;
5% of a binder;
0.2% of defoaming agent solution;
1.8% of toning solution;
the water surplus of the precoating material is used;
the adhesive comprises the following components in parts by weight:
100 parts of base resin;
10 parts of adhesive water;
7.5 parts of titanium dioxide;
the base resin is at least one of acrylic emulsion and polyurethane emulsion;
the defoaming agent solution is obtained by diluting a defoaming agent with water by a multiple of 1: 100;
the toning solution is obtained by diluting a pigment by a factor of 1:20 with water.
3. A blueprint paper pre-coating according to claim 1 or 2, characterised in that the binder also comprises 6-11 parts of carboxymethyl cellulose.
4. The blueprint paper pre-coating according to claim 3, wherein the binder further comprises starch, and the mass part ratio of the starch to the carboxymethyl cellulose is (0.1-0.3): 1.
5. the blueprint paper pre-coating according to claim 1 or 2, wherein the binder further comprises 1-5 parts of a silane coupling agent.
6. The blueprint paper pre-coating according to claim 1 or 2, wherein the base resin is prepared from the following components in parts by weight of 1: (0.55-0.7) acrylic emulsion and polyurethane emulsion.
7. The method of preparing a blueprint paper pre-coating of claims 1-7, comprising the steps of:
s1: uniformly mixing all raw materials of the adhesive at the temperature of 20-38 ℃ to obtain the adhesive;
s2: adding one third of the total amount of water for the pre-coating, adding silicon dioxide, and after the silicon dioxide naturally sinks to the bottom, dispersing at a high speed of 1000-; after the stirring speed is adjusted to 150-300r/min, adding the residual precoating material into water during the low-speed stirring;
s3: after the water is completely added to the precoating material, adding the adhesive under the condition of keeping the stirring speed of 150-300r/min, stirring and mixing for 18-25min, then adding the toning solution, stirring and mixing for 8-13 min, continuously adding the defoaming agent solution under the condition of keeping stirring, and finishing the addition of the defoaming agent solution within 5-10 min.
8. The method of claim 7, wherein in step S1, the starch is added to the binder water, the starch is mixed with the binder water, the carboxymethyl cellulose is added, and the rest of the binder raw material is added.
CN202011028946.0A 2020-09-25 2020-09-25 Pre-coating for blueprint paper and preparation method thereof Pending CN112144315A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116590954A (en) * 2023-05-12 2023-08-15 杭州东仪纸业有限公司 Blue print paper and preparation method thereof

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CN1244559A (en) * 1998-08-12 2000-02-16 吴坤山 Pre-painted adhesive and its compounding process
CN101639622A (en) * 2009-04-22 2010-02-03 珠海开元纸业有限公司 Method for producing thin photosensory blueprint paper
CN102505566A (en) * 2011-11-22 2012-06-20 上海东升新材料有限公司 Pre-coating liquor for blueprint paper and preparation method thereof
CN105803855A (en) * 2016-05-06 2016-07-27 浙江骏马数码科技有限公司 Waterproof ink-jet printing engineering blueprinting paper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1244559A (en) * 1998-08-12 2000-02-16 吴坤山 Pre-painted adhesive and its compounding process
CN101639622A (en) * 2009-04-22 2010-02-03 珠海开元纸业有限公司 Method for producing thin photosensory blueprint paper
CN102505566A (en) * 2011-11-22 2012-06-20 上海东升新材料有限公司 Pre-coating liquor for blueprint paper and preparation method thereof
CN105803855A (en) * 2016-05-06 2016-07-27 浙江骏马数码科技有限公司 Waterproof ink-jet printing engineering blueprinting paper

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* Cited by examiner, † Cited by third party
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