CN111304964A - Carbon-free carbon paper color developing agent and preparation process thereof - Google Patents
Carbon-free carbon paper color developing agent and preparation process thereof Download PDFInfo
- Publication number
- CN111304964A CN111304964A CN201910950152.0A CN201910950152A CN111304964A CN 111304964 A CN111304964 A CN 111304964A CN 201910950152 A CN201910950152 A CN 201910950152A CN 111304964 A CN111304964 A CN 111304964A
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- China
- Prior art keywords
- color developing
- developing agent
- copy paper
- color
- preparation
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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
-
- 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
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- 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
-
- 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
- D21H19/64—Inorganic compounds
-
- 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
Abstract
The invention discloses a preparation method of a carbon-free copy paper color developing agent, which comprises the following steps: mixing calcium bentonite and sulfuric acid solution to prepare a slurry mixture; putting the slurry mixture into a roller mill for activation reaction; washing the activated product with water, and adjusting the pH value to 5.7-6.2; adding zinc oxalate dihydrate, mixing uniformly, finally carrying out centrifugal separation, drying and grinding to obtain the carbonless copy paper color-developing agent. After the color developing agent is used for preparing the color developing coating and is coated on the base paper, the ISO value of the obtained product is more than 80 percent, and the color developing density is more than 60 percent.
Description
Technical Field
The invention belongs to the technical field of carbon-free copying paper color developing agents, and relates to an activated clay/metal complex pressure-sensitive color developing agent.
Background
Carbonless copy paper, also known as pressure-sensitive recording paper (or force-sensitive copy paper), was first developed in 1938 by National Cash Register (National Cash Register) and was released as a formal product in 1954. It is not intended to transfer a coloring matter indirectly by pressure to obtain a copying effect as in the case of a general copying paper, but to directly develop a color on paper by utilizing the pressure-sensitive action and the principle of chemical color development between a leuco dye of an electron donor and an acid color developing material of an electron acceptor to obtain a copy or the same recording material.
The carbonless copy paper color developing agent is a substance capable of developing the color of the pressure-sensitive pigment, and has the properties of white color, strong adsorbability, fast color development, firm color, no color change in air, small water absorption, large oil absorption, good processing performance, no toxicity, no deterioration, low price and the like. There are two main categories of color-developing agents for carbonless copy paper: one is an inorganic color-developing agent prepared from clay such as activated clay, and the other is a phenolic resin.
Patent EP 0.482409A1(1) discloses a color-developing agent synthesized from nonylsalicylic acid and formaldehyde, which has a high color-developing speed and a high color-developing density, but shows a color that is easily discolored and yellowed under irradiation of sunlight;
japanese patent application laid-open (A) No. Hei 4-118280 discloses a color-developing agent prepared by using starch as a complexing agent and adding various inorganic substances, which is inexpensive, but is not easy to preserve and easily deteriorates;
patent CN10141756313B discloses a method for producing an environment-friendly carbonless copy paper color developing agent, which only physically mixes activated bentonite with other fillers, does not form a good complexing effect, has a limited improvement on the color developing effect, and is not easy to store because more fillers are added.
Disclosure of Invention
The invention takes bentonite as raw material, mainly researches the preparation and color development of the activated clay color developing agent, prepares the high-quality activated clay pressure-sensitive color developing agent with the chemical composition and structure suitable for the requirements, and fully develops and utilizes bentonite resources.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a color developing agent for carbonless copy paper is characterized by comprising the following steps:
(1)according to mFixing device：mLiquid for treating urinary tract infectionMixing calcium bentonite and sulfuric acid solution in the ratio of 1 to 1.8 to prepare a slurry mixture;
(2) placing the slurry mixture into a roller mill, and carrying out uninterrupted roller milling for 2-3 hours at the temperature of 90-95 ℃ to carry out activation reaction;
(3) washing the activated product obtained in the step (2) with water, and adjusting the pH value of the activated product to 5.7-6.2;
(4) adding zinc oxalate dihydrate into the product obtained in the step (3), and uniformly mixing, wherein the addition amount of the zinc oxalate dihydrate is 1.5-2.0% of the mass of the calcium bentonite;
(5) and (4) centrifugally separating, drying and grinding the product obtained in the step (4) to obtain the carbonless copy paper color developing agent.
Further, in the step (1), the granularity of the calcium bentonite is more than or equal to 200 meshes, the content of the montmorillonite is 50-60%, and the mass fraction of the sulfuric acid solution is 15-18%.
The time for the activation reaction in step (2) is preferably 2.8 hours.
The mixing temperature in the step (4) is preferably 20 to 25 ℃.
The drying temperature in the step (5) is 105 ℃, and the granularity of the obtained powder is 800 meshes.
The above preparation process is further illustrated as follows:
1. according to mFixing device：mLiquid for treating urinary tract infection1:1.8, mixing calcium bentonite of 200 meshes or more with a sulfuric acid solution with the mass fraction of 15-18 percent to prepare a slurry mixture;
2. placing the obtained slurry mixture into an acid-resistant roller mill, and continuously rolling for 2.8 hours at the temperature of 95 ℃ to ensure that sulfuric acid can be fully contacted and mixed with bentonite, and activating the bentonite;
3. placing the activated slurry mixture into an acid-resistant tank for water washing until the pH value of a mixed system reaches 5.7-6.2;
4. adding zinc oxalate dihydrate with the mass of 1.5-1.7% of that of montmorillonite in calcium bentonite into a mixed system in an acid-resistant tank at the temperature of 20-25 ℃, and stirring for 30min to prepare an activated clay/zinc oxalate complex solution;
5. and (3) carrying out high-speed centrifugal separation treatment on the prepared solution, drying the obtained slurry at 105 ℃, and crushing the dried slurry into 800 meshes by using an ultrafine crusher to obtain a finished product.
The invention also provides the carbonless copy paper color developing agent prepared by the preparation method.
The invention utilizes the improved dry activation process to directly activate the calcium bentonite, simplifies the bentonite activation process and saves the acid consumption; after the acid regulation is finished, zinc oxalate and metal cation Zn are added by utilizing the surface characteristics of electronegativity of the activated montmorillonite2+Can excite proton-donating activity of the color-developing clay, and simultaneously forms a complex with montmorillonite, so that the organic dye Crystal Violet Lactone (CVL) after ring opening forms a more stable structure, and the color stability is enhanced. After the color developing agent is used for preparing the color developing coating and is coated on base paper, the ISO value of the obtained product is more than 80 percent, and the color developing density is more than 60 percent.
Detailed Description
Example 1
Putting 500kg of 200-mesh calcium bentonite into a 2000L acid-resistant roller mill, adding 900kg of sulfuric acid solution with the mass fraction of 15%, rolling for 2.8h at 95 ℃, transferring the obtained pulp into an acid-resistant tank, adding clear water to wash the pH to 5.5-6.2, adding 7.5kg of zinc oxalate dihydrate into the acid-adjusted system at 20-25 ℃, stirring for 30min, conveying the solution into a high-speed centrifugal dispersion machine, conveying solid matters into a drying furnace, drying at 105 ℃ until the water content is less than or equal to 8%, and crushing into 800 meshes by an ultrafine crusher to obtain the carbon-free copy paper color developing agent product.
Experiments prove that after the color developing agent is used for preparing the color developing coating and is coated on base paper, the ISO value of the obtained product is more than 80%, and the color developing density is more than 60%.
Example 2
Putting 300kg of 325-mesh calcium bentonite into a 2000L acid-resistant roller mill, adding 540kg of sulfuric acid solution with the mass fraction of 15%, rolling for 2.8 hours at 95 ℃, transferring the obtained slurry into an acid-resistant tank, adding clear water to wash the pH to 5.5-6.2, adding 5.1kg of zinc oxalate dihydrate into the acid-adjusted system at 20-25 ℃, stirring for 30 minutes, feeding the solution into a high-speed centrifugal dispersion machine, feeding solid matters into a drying furnace, drying at 105 ℃ until the water content is less than or equal to 8%, and crushing to 800 meshes by an ultrafine crusher to obtain the product.
Experiments prove that after the color developing agent is used for preparing the color developing coating and is coated on base paper, the ISO value of the obtained product is more than 80%, and the color developing density is more than 60%.
Claims (6)
1. A preparation method of a color developing agent for carbonless copy paper is characterized by comprising the following steps:
(1) according to mFixing device：mLiquid for treating urinary tract infectionMixing calcium bentonite and sulfuric acid solution in the ratio of 1 to 1.8 to prepare a slurry mixture;
(2) placing the slurry mixture into a roller mill, and carrying out uninterrupted roller milling for 2-3 hours at the temperature of 90-95 ℃ to carry out activation reaction;
(3) washing the activated product obtained in the step (2) with water, and adjusting the pH value of the activated product to 5.7-6.2;
(4) adding zinc oxalate dihydrate into the product obtained in the step (3), and uniformly mixing, wherein the addition amount of the zinc oxalate dihydrate is 1.5-2.0% of the mass of the calcium bentonite;
(5) and (4) centrifugally separating, drying and grinding the product obtained in the step (4) to obtain the carbonless copy paper color developing agent.
2. The preparation method according to claim 1, wherein in the step (1), the particle size of the calcium bentonite is not less than 200 meshes, the content of the montmorillonite is 50-60%, and the mass fraction of the sulfuric acid solution is 15-18%.
3. The method according to claim 1, wherein the time for the activation reaction in the step (2) is 2.8 hours.
4. The method according to claim 1, wherein the mixing temperature in the step (4) is 20 to 25 ℃.
5. The method according to claim 1, wherein the drying temperature in the step (5) is 105 ℃, and the particle size of the obtained powder is 800 mesh.
6. The carbonless copy paper color developing agent prepared by the preparation method of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910950152.0A CN111304964A (en) | 2019-10-08 | 2019-10-08 | Carbon-free carbon paper color developing agent and preparation process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910950152.0A CN111304964A (en) | 2019-10-08 | 2019-10-08 | Carbon-free carbon paper color developing agent and preparation process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111304964A true CN111304964A (en) | 2020-06-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910950152.0A Pending CN111304964A (en) | 2019-10-08 | 2019-10-08 | Carbon-free carbon paper color developing agent and preparation process thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN111304964A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1330984A (en) * | 1970-09-28 | 1973-09-19 | Fuji Photo Film Co Ltd | Colour-developer compositions |
| JPS58108190A (en) * | 1981-12-22 | 1983-06-28 | Mitsubishi Paper Mills Ltd | Pressure-sensitive recording sheet |
| CN101417563A (en) * | 2008-10-21 | 2009-04-29 | 莫文生 | Environmental protection carbonless copying paper developer preparation method using low acid method |
-
2019
- 2019-10-08 CN CN201910950152.0A patent/CN111304964A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1330984A (en) * | 1970-09-28 | 1973-09-19 | Fuji Photo Film Co Ltd | Colour-developer compositions |
| JPS58108190A (en) * | 1981-12-22 | 1983-06-28 | Mitsubishi Paper Mills Ltd | Pressure-sensitive recording sheet |
| CN101417563A (en) * | 2008-10-21 | 2009-04-29 | 莫文生 | Environmental protection carbonless copying paper developer preparation method using low acid method |
Non-Patent Citations (3)
| Title |
|---|
| 冯启明: "《非金属矿产加工与开发利用》", 31 December 2010, 北京：地质出版社 * |
| 吕宪俊等: "高效活性白土的制备及其活化机理研究", 《中国非金属矿工业导刊》 * |
| 莫文生: "无碳复写纸CF涂料的配制及发色性能研究", 《造纸化学品》 * |
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Application publication date: 20200619 |
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