CN112726281B - Synchronous register impregnated paper and preparation method thereof - Google Patents
Synchronous register impregnated paper and preparation method thereof Download PDFInfo
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- CN112726281B CN112726281B CN202011553004.4A CN202011553004A CN112726281B CN 112726281 B CN112726281 B CN 112726281B CN 202011553004 A CN202011553004 A CN 202011553004A CN 112726281 B CN112726281 B CN 112726281B
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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
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
- D21H17/51—Triazines, e.g. melamine
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
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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
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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
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/46—Non-macromolecular organic compounds
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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
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
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Abstract
The application relates to the field of impregnated paper production, and particularly discloses synchronous register impregnated paper and a preparation process thereof. A synchronous register impregnated paper comprises base paper, a base glue layer and a synchronous register glue layer which are sequentially arranged on the base paper; the bottom glue layer is formed by dipping bottom glue, and the solid content of the bottom glue is 45-50%; the synchronous patterned adhesive layer is formed by coating synchronous patterned adhesive, and the solid content of the synchronous patterned adhesive is 55-60%. The gum dipping expansion coefficient of the base paper is 1-3%. The preparation method comprises the following steps: and (3) dipping the base paper into a dipping section filled with the primer. And curing, heating to cure the primer so as to form the primer layer. And (3) coating, namely coating the flower glue by using synchronization. And (5) performing secondary curing, namely heating to cure the patterned rubber synchronously. Cutting into pieces to obtain the synchronous registration impregnated paper capable of discharging. The impregnated paper board has the advantages of difficult cracking and less whitening of the board surface.
Description
Technical Field
The application relates to the field of impregnated paper production, in particular to synchronous register impregnated paper and a preparation method thereof.
Background
The impregnated paper is wear-resistant, impact-resistant, pollution-resistant, flame-retardant, moisture-proof, environment-friendly, rich-style and non-fading furniture veneering paper, and is usually hot-pressed with a board to form a veneer board when in use.
The impregnated paper comprises synchronous register impregnated paper, namely, in the production process, the surface of the base paper is printed with patterns, and register color codes are printed on the side edges of the base paper. The cutting machine is provided with the detector, and in the cutting process, when the detector detected when marking the design, then the cutting machine cuts for the synchronous register impregnated paper after the cutting all has the same pattern.
However, the existing synchronous register impregnated paper is easy to cause the condition of plate surface cracking after being cut, and the quality of the synchronous register impregnated paper is relatively influenced.
Disclosure of Invention
In order to obtain the synchronous register impregnated paper with the plate surface not easy to crack, the application provides the synchronous register impregnated paper and the preparation method thereof.
In a first aspect, the present application provides a synchronous register impregnated paper, which adopts the following technical scheme:
a synchronous register impregnated paper comprises base paper, a base glue layer and a synchronous register glue layer which are sequentially arranged on the base paper; the bottom glue layer is formed by dipping bottom glue, and the solid content of the bottom glue is 45-50%; the synchronous patterned adhesive layer is formed by coating synchronous patterned adhesive, and the solid content of the synchronous patterned adhesive is 55-60%; the gum dipping expansion coefficient of the base paper is 1-3%.
By adopting the technical scheme, in the production process of the impregnated paper, the solid contents of the primer and the coating adhesive for impregnation can influence the expansion coefficient of the adhesive. When the solid content of the base glue is 45-50% and the solid content of the synchronous register glue is 55-60%, the expansion coefficient of the glue coated on the base paper layer is basically consistent with that of the base paper, so that the plate surface of the synchronous register impregnated paper cannot crack due to the large difference between the expansion coefficients of the glue layer and the base paper layer in the production process of the impregnated paper. The problems of surface cracking and whitening of the synchronous register impregnated paper can be well reduced.
Preferably, the synchronous flower alignment gum is prepared from the following raw materials in parts by weight:
100 parts of 37% formaldehyde;
92-96 parts of melamine;
18-21 parts of diethylene glycol;
9-11 parts of caprolactam;
24-28 parts of water.
By adopting the technical scheme, when the synchronous flower alignment gum is prepared by adopting the formula, the solid content of the prepared synchronous flower alignment gum is 55-60%. When the synchronous register impregnated paper is used for preparing, the condition of plate surface cracking can be reduced.
Preferably, the synchronous flower alignment gum is prepared from the following raw materials in parts by weight:
100 parts of 37% formaldehyde;
95 parts of melamine;
20 parts of diethylene glycol;
10 parts of caprolactam;
25 parts of water.
By adopting the technical scheme, when the synchronous register gum is prepared by adopting the proportion, the solid content of the prepared synchronous register gum is 55-60%, and when the synchronous register impregnated paper is prepared by using the synchronous register gum, the condition that the board surface is cracked can be reduced.
Preferably, the synchronous flower alignment gum is prepared by the following method:
the method comprises the following steps: mixing 37% of formaldehyde, diethylene glycol and caprolactam with water, uniformly stirring, and adjusting the pH value to 9-10;
step two: adding melamine into the mixture prepared in the first step, and uniformly stirring;
step three: heating to 95-100 deg.C, maintaining pH at 9-10, and maintaining the temperature;
step four: and (4) cooling, and discharging when the temperature is reduced to 35-45 ℃ to obtain the synchronous flower alignment glue.
By adopting the technical scheme, in the process of preparing the synchronous viscose rayon, 37 percent of formaldehyde, diglycol, caprolactam and water are mixed and then the pH value is adjusted, so that an alkaline environment is provided and the reaction of melamine is facilitated. And (2) after melamine is added, heating for reaction, keeping the pH value at 9-10 in the reaction process, and cooling after the reaction is finished to obtain the synchronous flower glue. The method is convenient to prepare the synchronous registration gum, and the prepared synchronous registration gum meets the requirements.
Preferably, in the first step, a sodium hydroxide solution with a concentration of 30% is selected to adjust the pH value.
By adopting the technical scheme, when the pH value is adjusted, the sodium hydroxide solution is used for adjustment, no redundant substance is generated, and no impurity influencing the property of the glue is generated.
Preferably, in the first step, the stirring time is 10 min.
By adopting the technical scheme, the stirring process in the step one can be uniformly stirred after stirring for 10 min.
Preferably, in the third step, the temperature rise process is 20-30 min.
By adopting the technical scheme, the temperature rise time is controlled within 20-30min in the temperature rise process, so that the phenomenon that the reaction rate is too high due to too high temperature rise is avoided, and the phenomenon that the reaction process is too slow due to too low temperature rise can also be avoided.
Preferably, in the third step, the heat preservation temperature is 90-95 ℃, and the heat preservation time is 60-90 min;
by adopting the technical scheme, in the third step, the heat preservation temperature is set to be 90-95 ℃, and after the heat preservation is carried out for 60-90min, the reaction is completed, and the glue with the required solid content can be obtained.
Preferably, in the third step, a glue sample is taken and placed in water at 22 ℃, and if turbidity appears and 5 seconds do not dissipate, the fourth step is carried out.
Through adopting above-mentioned technical scheme, at the preparation glue in-process, along with the going on of reaction, the muddy circumstances of 0 ℃ water at first can appear, and along with the going on of reaction, glue molecular weight constantly increases, can appear 10 ℃, 20 ℃ and the muddy circumstances of 22 ℃ water in proper order, according to the muddy degree of glue in the aquatic of different temperatures, judges the solid content in the glue to control the reaction terminal point, obtain required glue. When the glue sample is placed in water at 22 ℃, the glue sample can be turbid and still turbid after 5 seconds, which indicates that the solid content of the glue sample reaches the required standard, and at the moment, the glue sample can be cooled to stop reaction, so that the glue sample is convenient to discharge.
Preferably, the base glue comprises urea formaldehyde resin and the synchronous flower glue, and the weight ratio of the urea formaldehyde resin to the synchronous flower glue is (4.25-5.25): 1.
By adopting the technical scheme, in the preparation process of the base glue, the urea-formaldehyde resin and the synchronous register glue can be selected and mixed according to the weight ratio of (4.25-5.25) to 1 to prepare the base glue with the solid content of 45-50 percent, and the base glue with the solid content can ensure that the synchronous register impregnated paper is not easy to crack.
Preferably, in the primer, the weight ratio of the urea-formaldehyde resin to the synchronous fancy glue is 5: 1.
By adopting the technical scheme, in the preparation process of the base glue, when the weight ratio of the urea-formaldehyde resin to the synchronous patterned glue is 5:1, the solid content of the prepared base glue is 45-50%.
Preferably, the urea-formaldehyde resin is prepared by the following method:
the method comprises the following steps: 100 parts by weight of formaldehyde with the concentration of 37 percent is put into a reaction kettle at one time, 30 to 35 parts by weight of urea with the concentration of 98 percent is put into the reaction kettle, 12 to 18 parts by weight of water is added, and the PH value is adjusted to 8.0 to 9.0 by sodium hydroxide solution.
Step two: opening an oil valve, heating to 78-82 deg.C, stopping heating, automatically heating to 85-88 deg.C, maintaining the temperature for 28-32 min, adding formic acid solution, controlling pH to 4-5, and performing polycondensation reaction at 90-95 deg.C.
Step three: when the reaction is carried out until the glue solution appears thick white fog in water with the temperature of 20 ℃, 6.5 to 7.5 parts of compound additive is added, the pH value is adjusted to 7.0, and 24 to 26kg of urea with the concentration of 98 percent is added when the temperature is reduced to 80 to 85 ℃.
Step four: cooling to 65-68 deg.C, adding 18-20kg of 98% urea, adjusting pH to 7.0, and cooling to 38-40 deg.C to obtain urea-formaldehyde resin base adhesive.
By adopting the technical scheme, the prepared urea-formaldehyde resin can be well mixed with the synchronous register gum, and after the urea-formaldehyde resin and the synchronous register gum are mixed according to a certain proportion, the solid content of the prepared primer is 45-50%.
In a second aspect, the application provides a preparation method of synchronous register impregnated paper, which adopts the following technical scheme:
a preparation process of synchronous register impregnated paper comprises the following steps:
a gum dipping step, namely dipping the base paper into a gum dipping section, wherein the gum dipping section is filled with the primer;
a first curing step, heating to cure the primer so as to form a primer layer, wherein the curing time is 20-35 s;
coating, namely coating the cured base paper by using the synchronous flower glue;
a second curing step, heating to cure the synchronous register glue so as to form a synchronous register glue layer; the curing time is 50-80 s; and a cutting step, cutting the synchronously patterned impregnated paper after the second curing, and discharging.
By adopting the technical scheme, in the process of producing the synchronous register impregnated paper, gum dipping is firstly carried out, so that the base paper enters a gum dipping section, the base glue is connected with the base paper, a base glue layer is formed after the base glue is cured, then coating is carried out again, the synchronous register glue is attached to the base glue layer, and after the base glue layer is cured, the synchronous register impregnated paper is produced. Then cutting is carried out to obtain the synchronously-butted impregnated paper capable of discharging.
Preferably, after the base paper is gummed, the expansion coefficient of the base paper is 1-3%; after the synchronous register impregnated paper is cured for the second time, the transverse expansion coefficient is 2-5%, and the longitudinal expansion coefficient is 2-5%.
By adopting the technical scheme, the expansion coefficient of the base paper is 1-3% after the base paper is soaked in the primer and is completely soaked. After the base paper is cured (the curing mode is heating by pressing and pasting a steel plate, the pressure of the steel plate on the impregnated paper is 15-20mpa, the heating temperature is 200-.
In summary, the present application has the following beneficial effects:
1. as the base glue with the solid content of 45-50% and the synchronous register glue with the solid content of 55-60% are adopted to dip and coat the base paper, the board surface of the synchronous register dipping paper obtained by production is not easy to crack.
2. In the application, the urea-formaldehyde resin is preferably adopted to add the synchronous pair gum as the primer, so that the preparation of new primer can be reduced, the preparation is convenient, and the obtained primer meets the requirement that the solid content is 45-50%.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples of preparation of raw materials and/or intermediates
Preparation example 1
A urea-formaldehyde resin is prepared by the following steps:
the method comprises the following steps: 100kg of formaldehyde with a concentration of 37% was placed in a reaction vessel at once, 32.7kg of urea with a concentration of 98% was added, 15kg of water was added, and the pH was adjusted to 8.0 with sodium hydroxide solution.
Step two: opening an oil valve, heating to 80 ℃, stopping heat supply, automatically heating to 85 ℃, keeping the temperature for 30 minutes, adding a formic acid solution, controlling the pH value to be 4.5, and carrying out polycondensation reaction at 92 ℃.
Step three: when the reaction is carried out until the glue solution generates thick white fog in water at the temperature of 20 ℃, 7kg of compound additive is added, the PH value is adjusted to 7.0, and 24.3kg of urea with the concentration of 98 percent is added after the temperature is reduced to 85 ℃.
Step four: and (3) cooling to 65 ℃, adding 19kg of urea with the concentration of 98%, adjusting the pH to 7.0, and continuously cooling to 40 ℃, and discharging to obtain the urea-formaldehyde resin base adhesive.
Preparation example 2
The synchronous flower alignment gum is prepared by the following steps of:
the method comprises the following steps: adding 37% of formaldehyde, diethylene glycol, caprolactam and water into a reaction kettle, stirring for 10min to uniformly stir all substances, and adjusting the pH value of the mixed substance by using a 30% sodium hydroxide solution, wherein the pH value is controlled to be 9.0.
Step two: and adding melamine into the reaction kettle, and uniformly stirring.
Step three: and opening an oil valve of the reaction kettle to ensure that the reaction kettle is heated. After 25min, the temperature of the reaction kettle is raised to 100 ℃, the pH value is controlled to be 9, the temperature is kept to be 95 ℃, and the temperature is kept for 75 min.
Step four: and (3) putting the sample glue into water at the temperature of 22 ℃, wherein the water is turbid and is not clear after 5 seconds, and cooling is started. When the temperature is reduced to 40 ℃, discharging to obtain the synchronous flower alignment glue.
The water solubility times were measured using a water solubility tester and the viscosity was measured using a viscosity cup-cup No. 4. The water solubility was measured to be 1.5, it was run off completely 22s after coating on cup No. 4, and the solids content was determined to be 58.5%.
Preparation example 3
The synchronous flower alignment gum is prepared by the following steps of:
the method comprises the following steps: adding 37% of formaldehyde, diethylene glycol, caprolactam and water into a reaction kettle, stirring for 10min to uniformly stir all the substances, and adjusting the pH value of the mixed substance by using a 30% sodium hydroxide solution, wherein the pH value is controlled to be 10.
Step two: and (3) adding melamine into the reaction kettle, and uniformly stirring.
Step three: and opening an oil valve of the reaction kettle to heat the reaction kettle. After 24min, the temperature of the reaction kettle is raised to 95 ℃, the PH value is controlled to be 10, the temperature is kept to be 90 ℃, and the temperature is kept for 90 min.
Step four: and (3) putting the sample glue into water at the temperature of 22 ℃, wherein the water is turbid and is not clear after 5 seconds, and cooling is started. When the temperature is reduced to 40 ℃, discharging to obtain the synchronous flower alignment glue.
The water solubility times were measured using a water solubility tester and the viscosity was measured using a viscosity cup-cup No. 4. The water solubility was measured to be 1.4, which was drained off completely 20s after coating on cup No. 4 and the solids content was determined to be 55.4%.
Preparation example 4
The synchronous flower alignment gum is prepared by the following steps of:
the method comprises the following steps: adding 37% of formaldehyde, diethylene glycol, caprolactam and water into a reaction kettle, stirring for 10min to uniformly stir all the substances, and adjusting the pH value of the mixed substance by using a 30% sodium hydroxide solution, wherein the pH value is controlled to be 9.
Step two: and adding melamine into the reaction kettle, and uniformly stirring.
Step three: and opening an oil valve of the reaction kettle to ensure that the reaction kettle is heated. After 28min, the temperature of the reaction kettle is raised to 98 ℃, the pH value is controlled to be 9, the temperature is kept at 92 ℃, and the temperature is kept for 60 min.
Step four: and (3) putting the sample glue into water at the temperature of 22 ℃, wherein the water is turbid and is not clear after 5 seconds, and cooling is started. When the temperature is reduced to 40 ℃, discharging to obtain the synchronous flower alignment glue.
The water solubility times were measured using a water solubility tester and the viscosity was measured using a viscosity cup-cup No. 4. The water solubility was measured to be 1.8, which was discharged in total 24s after coating cup No. 4 and the solids content was determined to be 59.3%.
Table 2: raw material tables of preparation examples 2 to 4
| (kg) | 37% of formaldehyde | Diethylene glycol | Caprolactam | Water (W) | Melamine |
| Preparation example 2 | 100 | 18 | 9 | 28 | 96 |
| Preparation example 3 | 100 | 21 | 11 | 24 | 92 |
| Preparation example 4 | 100 | 20 | 10 | 25 | 95 |
Examples
Example 1
A synchronous register impregnated paper is prepared by the following steps:
and (5) selecting paper. Selecting base paper, wherein the gum dipping expansion coefficient of the base paper is 2%. The gram number of the base paper is 70g/m 2 。
And (5) gum dipping. And (3) placing a primer into a glue tank of the glue dipping section, wherein the primer is 500kg of urea-formaldehyde resin prepared in the preparation example 1 and 100kg of synchronous patterned glue obtained in the preparation example 2 which are uniformly stirred, and the solid content of the primer is 48.5%. And conveying the base paper to a dipping section by using a conveying roller so that the base paper is dipped into a dipping tank. The dry humidity of the glue is 15%, and the glue coated on the base paper at the gum dipping section accounts for 53% of the total glue amount.
And conveying the impregnated base paper to a drying section, wherein the drying temperature is 100 ℃, and the drying time is 20s, so that the base paper can be fully impregnated into the paper core.
And (5) coating. The synchronous registration gum obtained in preparation example 2 was placed in a gum tank of a coater, and the solid content was 58.5%. The coating machine is used for coating the dried base paper, synchronous pattern matching glue is coated on both sides of the base paper in the coating process, and the glue in the coating section accounts for 47% of the total glue amount.
And a second curing step. And conveying the coated base paper to a drying section, wherein the drying temperature is 135 ℃, and the drying time is 60s, so that the synchronous register glue is further cured, and a synchronous register glue layer is formed on the surface of the base paper to form finished paper.
The sizing amount of the finished paper is 160%, the volatile matter is 7.0%, and the pre-curing degree is 45%.
And (5) cutting. And (5) performing synchronous registration cutting by using a cutting machine to obtain the cut synchronous registration impregnated paper.
Example 2
A synchronized registered impregnated paper, differing from example 1 in that: the synchronous chemical matching glue prepared in preparation example 3 is adopted.
The glue coated on the base paper at the gum dipping section accounts for 63 percent of the total glue amount. The glue of the coating section accounts for 37 percent of the total glue amount, the gluing amount of the prepared finished product is 170 percent, the volatile matter is 6.2 percent, and the pre-curing degree is 65 percent.
Example 3
A synchronized registered impregnated paper, differing from example 1 in that: the synchronous contrasting adhesive prepared in preparation example 4 was used.
The glue coated on the base paper at the gum dipping section accounts for 58 percent of the total glue amount. The glue of the coating section accounts for 42 percent of the total glue amount, the gluing amount of the prepared finished product is 190 percent, the volatile matter is 7.6 percent, and the pre-curing degree is 52 percent.
Comparative example
Comparative example 1
A simultaneous registered impregnated paper, differing from example 1 in that the primer was a commercial urea-formaldehyde resin glue and had a solids content of 42%.
Comparative example 2
A synchronized registered impregnated paper, differing from example 3 in that the base paper impregnation swell factor is 5%.
Comparative example 3
A simultaneous registered impregnated paper, differing from example 3 in that the base stock was 600kg of the urea resin obtained in preparation example 1.
Performance test
Detection method/test method
The simultaneous registered impregnated papers obtained in examples 1 to 3 and comparative examples 1 to 3 were visually observed for the presence of cracks, blisters and whitening on the surface. The test results are shown in table 3.
Table 3: test results
| Whether or not to crack | Whether or not foaming occurs | Whether it turns white or not | |
| Example 1 | Without cracking | Without foaming | Has no blushing effect |
| Example 2 | Without cracking | Without foaming | Has no blushing effect |
| Example 3 | Without cracking | Without foaming | Has no blushing effect |
| Comparative example 1 | With cracking | Foaming | Whitening hair |
| Comparative example 2 | With cracking | Foaming | Whitening hair |
| Comparative example 3 | With cracking | Foaming | Whitening hair |
It can be seen from the combination of examples 1-3 and comparative examples 1-2 and from Table 3 that when the solid content of the base glue is 45-50% and the solid content of the synchronized embossing glue is 55-60%, the base paper expansion coefficient of the prepared synchronized embossing impregnated paper is substantially consistent with the expansion coefficient of the glue layer, so that the impregnated paper is not easily broken and the glue layer is not easily peeled and whitened during the curing process. In comparative example 1, the volatile matter in the impregnation section was 12%, the glue applied to the base paper in the impregnation section accounted for 48% of the total amount of glue, and the glue in the application section accounted for 52% of the total amount of glue, resulting in a dry-out condition on the surface of the impregnated paper. In addition, the impregnated paper produced in comparative example 2 was cut with a synchronous cut size exceeding a prescribed ± 4mm, resulting in failure of synchronous registration due to a large difference between the impregnation expansion coefficient of the base paper and the expansion coefficient of the glue.
It can be seen from the combination of examples 1-3 and comparative example 3 and the combination of table 3 that, in the process of preparing the primer, compared with the case of only adding the urea-formaldehyde resin, the solid content of the primer in the impregnation section can be increased after mixing the urea-formaldehyde resin and the synchronous register glue, and the fluidity of the glue can be greatly increased after adding the synchronous register glue because the urea-formaldehyde resin is easy to absorb moisture, is not high temperature resistant and has poor fluidity, so that the problems of whitening surface, wear resistance, scratch resistance and the like can be improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, 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 application.
Claims (2)
1. The synchronous register impregnated paper is characterized by comprising base paper, a base glue layer and a synchronous register glue layer which are sequentially arranged on the base paper;
the bottom glue layer is formed by dipping bottom glue, and the solid content of the bottom glue is 45-50%;
the synchronous registration adhesive layer is formed by coating synchronous registration adhesive, and the solid content of the synchronous registration adhesive is 55-60%;
the gum dipping expansion coefficient of the base paper is 1-3%;
the synchronous flower alignment gum is prepared from the following raw materials in parts by weight:
100 parts of 37% formaldehyde;
92-96 parts of melamine;
18-21 parts of diethylene glycol;
9-11 parts of caprolactam;
24-28 parts of water;
the synchronous flower alignment gum is prepared by the following method:
the method comprises the following steps: mixing 37% of formaldehyde, diethylene glycol and caprolactam with water, uniformly stirring, and adjusting the pH value to 9-10;
step two: adding melamine into the mixture prepared in the first step, and uniformly stirring;
step three: heating to 95-100 deg.C, maintaining pH at 9-10, and maintaining the temperature;
step four: cooling, and discharging when the temperature is reduced to 35-45 ℃ to obtain the synchronous flower alignment gum;
in the first step, the stirring time is 10 min;
in the third step, the temperature rise process is 20-30 min;
in the third step, the heat preservation temperature is 90-95 ℃, and the heat preservation time is 60-90 min;
in the third step, the glue sample is placed in water at the temperature of 22 ℃, and if the glue sample is turbid and does not disperse for 5 seconds, the fourth step is carried out;
the base glue comprises urea-formaldehyde resin and the synchronous flower alignment glue, and the weight ratio of the urea-formaldehyde resin to the synchronous flower alignment glue is (4.25-5.25);
the urea-formaldehyde resin is prepared by the following method:
the method comprises the following steps: putting 100 parts by weight of formaldehyde with the concentration of 37% into a reaction kettle at one time, adding 30-35 parts by weight of urea with the concentration of 98%, adding 12-18 parts by weight of water, and adjusting the pH value to 8.0-9.0 by using a sodium hydroxide solution;
step two: opening an oil valve, heating to 78-82 ℃, stopping heat supply, automatically heating to 85-88 ℃, keeping the temperature for 28-32 minutes, adding a formic acid solution, controlling the pH value to be 4-5, and carrying out polycondensation reaction at 90-95 ℃;
step three: when the reaction is carried out until thick white fog appears in the glue solution in water with the temperature of 20 ℃, 6.5 to 7.5 parts of composite additive is added, the pH value is adjusted to be 7.0, and 24 to 26kg of urea with the concentration of 98 percent is added when the temperature is reduced to 80 to 85 ℃;
step four: cooling to 65-68 deg.C, adding 18-20kg of 98% urea, adjusting pH to 7.0, and cooling to 38-40 deg.C to obtain urea-formaldehyde resin base adhesive;
the glue of the primer coated on the base paper accounts for 53 percent of the total glue amount;
the glue for synchronously coating the pattern glue on the base paper accounts for 47 percent of the total glue amount;
after synchronous coating of the pattern gum, drying is carried out, and the obtained finished paper has the gum coating amount of 160%, the volatile component of 7.0% and the pre-curing degree of 45%.
2. A process for preparing a synchronous registered impregnated paper, which is used for preparing the synchronous registered impregnated paper of claim 1, and is characterized by comprising the following steps:
a gum dipping step, namely dipping the base paper into a gum dipping section, wherein the gum dipping section is filled with primer;
a first curing step, heating to cure the primer so as to form a primer layer, wherein the curing time is 20-35 s;
coating, namely coating the cured base paper by using the synchronous flower glue;
a second curing step, heating to cure the synchronous register glue so as to form a synchronous register glue layer; the curing time is 50-80 s;
and a cutting step, cutting the synchronously aligned impregnated paper after the second curing, and discharging.
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| CN102966003A (en) * | 2012-10-15 | 2013-03-13 | 常州卫星装饰材料有限公司 | Production method of pattern synchronously matched impregnated paper |
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