CN113087031A - Tap water offset printing water quality stabilizer, preparation method, use method and application thereof - Google Patents
Tap water offset printing water quality stabilizer, preparation method, use method and application thereof Download PDFInfo
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- CN113087031A CN113087031A CN202110315109.4A CN202110315109A CN113087031A CN 113087031 A CN113087031 A CN 113087031A CN 202110315109 A CN202110315109 A CN 202110315109A CN 113087031 A CN113087031 A CN 113087031A
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- water
- water quality
- printing
- quality stabilizer
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- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- HRXKRNGNAMMEHJ-UHFFFAOYSA-K trisodium citrate Chemical group [Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O HRXKRNGNAMMEHJ-UHFFFAOYSA-K 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
- B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/12—Prevention of foaming
Abstract
The invention belongs to the technical field of offset printing, and particularly relates to a tap water offset printing water quality stabilizer, and a preparation method, a use method and application thereof. The water quality stabilizer comprises the following components in parts by weight in total 100 parts: 5-17 parts of a buffering agent, 1-10 parts of a printing plate protective agent, 5-50 parts of a wetting reinforcing agent, 5-30 parts of a plate cleaning reinforcing agent, 0.5-5 parts of a bactericide, 0.5-5 parts of a defoaming agent and the balance of water; the moistening enhancer is one or more selected from maltose, glucose syrup, white sugar, maltose syrup, fructose-glucose syrup, arabinose, xylitol and cyclodextrin.
Description
Technical Field
The invention belongs to the technical field of offset printing, and particularly relates to a tap water offset printing water quality stabilizer, and a preparation method, a use method and application thereof.
Background
The traditional lithographic printing utilizes the principle that oil and water are not soluble, and the part with patterns on a printing plate is hydrophobic and ink-hydrophilic so as to realize the coating of ink on the printing plate; and a thin dampening film is coated on the part of the printing plate without the pattern, and the water film has the function of repelling ink and hydrophilicity. Therefore, the positions covered by the dampening water film are not stained with ink, and the positions with ink are not stained with the dampening water film. In order to facilitate smooth formation of the dampening water film, it is necessary to reduce the surface tension of water. Therefore, in the prior art of lithographic printing, it is necessary to add alcohol, isopropyl alcohol (IPA), or other alcohol or ether substitutes to the fountain solution in order to reduce the surface tension of water.
However, alcohol, isopropanol or other alcohol and ether substitutes have more disadvantages:
1. isopropanol is harmful to human health, and has bad influence on the environment no matter being discharged in air or nature due to volatile matters, and especially in a relatively closed printing workshop, the volatile isopropanol vapor can seriously damage the health of operators;
2. alcohol and isopropanol belong to flammable and explosive products, and are very unsafe because the flash point is too low and the alcohol and the isopropanol are easy to combust and explode;
3. the printing cost is increased;
4. more printing problems are caused. Because the alcohol, the isopropanol or the substitute of the alcohol and the ether can dissolve and dilute the printing ink, the surface of the printing ink at the junction of the printing ink layer and the water layer is easy to be eroded, thereby causing the printing problems of poor drying of the printing ink, formation of ink mist, ink piling, easy reverse drawing, light ink color and the like.
There have been long attempts to improve the formulation of inks or fountain solutions to address the above problems, such as changing the ink formulation to improve its resistance to fountain attack, or changing the fountain formulation to reduce its attack on the ink (the latter of which is of greater concern). With the growing concern and importance of human beings on environment, health and safety, the research direction is changing to the use of alcohol or isopropanol as a substitute to reduce or even eliminate the amount of alcohol or isopropanol in the dampening water. At home and abroad, alcohol substitutes (all alcohols or ethers, such as propylene glycol, ethylene glycol, propylene glycol methyl ether and the like) are added into dampening water or ink so as to be expected to replace the alcohol or the isopropanol. However, these alternatives do not completely replace alcohol or isopropanol. Thus, fountain solutions containing these alternatives are termed "alcohol-free" fountain solutions, but in practice they are not completely alcohol-free, except that the alcohol content is generally less than 5 wt.%.
Based on the problems of environmental pollution, potential safety hazard and printing quality existing in the printing industry generally, the invention patent ZL201510662688.4 firstly designs a zero-alcohol lithographic printing system (namely, no alcohol substances exist in dampening water of the lithographic printing system) domestically and internationally, and successfully implements the zero-alcohol lithographic printing system, thereby effectively solving the problems of ink erosion, environment pollution, damage to health, poor drying of the ink, light color, ink mist formation, ink piling, easy reverse drawing, difficult control of hue and the like.
However, due to different tap water standards, hardness, pH value, water quality, total solid content and the like,
disclosure of Invention
The invention aims to provide a water quality stabilizer suitable for a zero-alcohol lithographic printing technology, which can achieve the purposes of safety, environmental protection, energy conservation and emission reduction in the using process, so that printing operators can avoid the chronic toxicity of alcohol or isopropanol, and the printing quality is greatly improved. In addition, the water quality stabilizer can realize universal offset printing, so that a user can use the water quality stabilizer well without changing the conventional habit.
The invention provides a tap water offset printing water quality stabilizer, which comprises the following components in 100 parts by weight: 5-17 parts of a buffering agent, 1-10 parts of a printing plate protective agent, 5-50 parts of a wetting reinforcing agent, 5-30 parts of a plate cleaning reinforcing agent, 0.5-5 parts of a bactericide, 0.5-5 parts of a defoaming agent and the balance of water; the moistening enhancer is one or more selected from maltose, glucose syrup, white sugar, maltose syrup, fructose-glucose syrup, arabinose, xylitol and cyclodextrin.
Preferably, the buffer comprises: citric acid, sodium citrate, EDTA-2Na, citric acid: sodium citrate: the weight ratio of EDTA-2Na is (1-6) to (3-8): (1-3).
Preferably, the plate cleaning reinforcing agent is selected from one or more of saponin extract, stearic acid, tea saponin, oleic acid, sterol and sitosterol. The plate cleaning reinforcing agent is natural and environment-friendly surfactant substances.
Because more organic compounds added in the traditional offset printing fountain solution are easy to interact with chemical components in the printing ink, so that more printing ink is easy to adhere to a printing plate, the plate cleaning reinforcing agent in the traditional offset printing fountain solution is required to have a strong cleaning function, and an artificially synthesized surfactant is often used.
The tap water offset printing water quality stabilizer is mainly used for an offset printing wetting system mainly comprising tap water, and the wetting component is basically the tap water, so that the interaction between the wetting component and ink is avoided, therefore, the plate cleaning reinforcing agent does not require strong surface activity, and natural and environment-friendly surfactant substances can be used.
Preferably, the printing plate protective agent is selected from one or more of gum arabic and CMC. The printing plate protective agent is a high-hydrophilicity and re-soluble high-molecular natural compound.
Preferably, the bactericide is selected from one or more of cason and sodium hypochlorite. The bactericide is used for sterilizing and killing algae.
Preferably, the defoamer is an aqueous defoamer, and aqueous defoamers commonly used in the art can be used in the present invention.
The conventional non-environment-friendly plate cleaning reinforcing agent, bactericide and defoaming agent sold in the market at present can also be used in the invention, but the invention preferably uses the environment-friendly formula components.
The invention provides a preparation method of a tap water offset printing water quality stabilizer, which comprises the following raw materials in 100 parts by weight: 5-17 parts of a buffering agent, 1-10 parts of a printing plate protective agent, 5-50 parts of a wetting reinforcing agent, 5-30 parts of a plate cleaning reinforcing agent, 0.5-5 parts of a bactericide, 0.5-5 parts of a defoaming agent and the balance of water; the moistening enhancer is one or more selected from maltose, glucose syrup, white sugar, maltose syrup, fructose-glucose syrup, arabinose, xylitol and cyclodextrin;
the preparation method comprises the following steps:
weighing the raw materials in proportion, adding water into a reaction kettle, and then sequentially adding the raw materials, wherein the adding method comprises the following steps: and after the former raw material is completely dissolved, adding the latter raw material, and stirring to obtain the water quality stabilizer.
The third aspect of the present invention provides a method for using the water quality stabilizer of the first aspect, comprising the steps of: diluting the water quality stabilizer in the first aspect by adding water with the mass times of 45-100 times to obtain a directly used stabilizer aqueous solution, and adding the stabilizer aqueous solution into a water tank of a printing machine to normally start up the printing.
The water quality stabilizer of the invention has the following functions and principles:
the plate cleaning reinforcing agent can reduce the surface tension of water, so that a water film can quickly cover a blank part, the blank part can be well covered during high-speed printing, and the blank part is prevented from being dirty. Meanwhile, the water quality stabilizer is fast to spread on the blank part and has good wetting effect. The plate cleaning reinforcing agent selects a low-foam product, and can prevent the problem of excessive foam. When the blank part of the printing machine is inked by dragging the plate or other reasons, the ink layer on the blank part can be quickly removed, so that the printing can be smoothly carried out without manually scrubbing the plate surface.
The buffer in the fountain solution functions to maintain the pH in a stable range. Conventionally, a buffer system composed of phosphoric acid and phosphate has been used in many fountain solutions.
In the process of implementing the invention, the inventor finds that the blank oxidation film layer is abraded under the high-speed friction of the printing plate, if the blank oxidation film layer is not repaired in time, the thickness of the water film and the hydrophilicity of the blank oxidation film layer are greatly influenced, and the printing plate is easy to be dirty and is not beneficial to normal printing. The invention uses the buffer containing citric acid, sodium citrate and EDTA-2Na in the fountain solution for the first time, and the citric acid and the sodium citrate form a group of buffer pairs, so that the pH value can be kept in a stable range. In addition to the conventional action of buffers, the following unexpected technical effects are also achieved: 1. the cleaning capability of the plate cleaning is enhanced, a citrate layer can be quickly supplemented to the worn bare blank part of the printing plate, and the water absorption and hydrophilic oil repellent capability are enhanced; 2. because the printing equipment is made of steel, the buffering agent has the effects of corrosion inhibition and rust prevention on mechanical steel parts; 3. EDTA-2Na has complexation effect on calcium and magnesium ions in water and prevents the calcium and magnesium ions from calcification on the water roller or the ink roller to influence the transfer of water or ink. Therefore, the buffer agent of the invention can not only ensure stable pH value, but also quickly repair abraded oxide film layer, so that the tap water offset printing can adapt to tap water quality with different hardness, pH value and solid content in various places.
The buffering agent of the invention can rapidly supplement a citrate layer at the blank part of a worn bare printing plate, and the principle is as follows: the base material of the printing plate is aluminum, the surface oxidation film is an aluminum oxide layer, the citrate belongs to organic salt, and the carboxyl of the citrate is easy to form a stable citrate layer through a complex reaction with the aluminum oxide on the surface of the printing plate. In the existing phosphate buffer system, phosphoric acid belongs to inorganic salt, and only weak ionic bond interaction exists between the phosphoric acid and alumina, so that a stable wet surface layer cannot be formed.
The main functions of the printing plate protective agent are to enhance the hydrophilicity of blank parts, enable water films to be easily covered, correspondingly weaken the abrasion of the blank parts and quickly reach the balance function again even after the machine is stopped; and secondly, the viscosity of the stabilizer can be improved, the water feeding function is improved, and the use is more convenient.
Effect of wetting enhancer: in the conventional alcohol-containing fountain solution, the alcohol forms a relatively firm wetting layer with water through a relatively strong hydrogen bond, and thus a wetting enhancer is not required. In the tap water offset printing system of the present invention, alcohol fountain is no longer added for environmental reasons, so that a stable fountain layer based on hydrogen bonding is lacking and a wetting enhancer needs to be added. Effect of wetting enhancer: can increase the thickness of the water film, ensure that the water film is not easy to break, and enhance the applicability and the production stability of the stabilizer.
In conclusion, all the formulas of the water quality stabilizer disclosed by the invention can be developed around the purpose of quickly achieving ink and water balance in the using process of a zero-alcohol lithographic printing system. On the basis of the implementation of the patent ZL201510662688.4, the standardized tap water quality stabilizer is designed based on different tap water standards, hardness and softness, pH value, water quality, total solid content and the like in various places, the standardized tap water meeting the requirement of tap water offset printing is provided, and a water quality stabilizer material with better plate wetting and cleaning functions is selected by accident, so that the whole zero-alcohol lithographic printing system is further perfected, the production stabilizer and the printing quality are improved, and the printing cost is reduced.
The water quality stabilizer provided by the invention has the following advantages:
1. the conventional fountain solution contains volatile components such as ethanol, isopropanol, ethylene glycol, propanol and the like, and the concentration of the volatile components is gradually reduced due to volatilization in the printing process, so that the color difference of a printed product is caused, and the printing stability is influenced.
The water quality stabilizer does not contain volatile components, so that the concentration of each component in the printing process is stable, the color difference of a printed product is small, and the printing stability is good after starting up.
2. The water quality stabilizer has the advantages of thin water film, strong hydrophilicity, no rubber cloth stacking, no easy deformation of paper, and accurate registration of the front side and the back side. Furthermore, the thin water film also has the following advantages: the ink and water balance can be achieved more quickly by using a thinner water film, the operation is easy, no special requirements are required for users, the use habit is not changed, and the adaptability is wide; the thinner water film does not dilute the ink excessively, so that the original ink film is brighter and full, the color can be reduced by using less ink, and the quality of the printed matter is improved.
4. The water quality stabilizer has no flash point, is not flammable and is safe to transport and store.
5. The water quality stabilizer of the invention is prepared from natural environment-friendly components, has no pollution to the environment, guarantees the health of printing workers, and is greatly helpful for improving the air quality of the printing production environment.
6. The water quality stabilizer is suitable for various machine types and/or users, and the cost of comprehensive consumables can be greatly reduced by more than 90%.
7. The stabilizer is suitable for tap water with different hardness, and can achieve good printing effect only by adding the stabilizer.
Drawings
None.
Detailed Description
The present invention is further illustrated by the following examples, but is not limited to these examples. The experimental methods not specified in the examples are generally commercially available according to the conventional conditions and the conditions described in the manual, or according to the general-purpose equipment, materials, reagents and the like used under the conditions recommended by the manufacturer, unless otherwise specified. The starting materials required in the following examples and comparative examples are all commercially available.
Example 1
A tap water offset printing water quality stabilizer comprises the following components (by weight portion):
1 part of citric acid, 8 parts of sodium citrate, 1 part of EDTA-2Na, 1 part of CMC, 50 parts of white granulated sugar, 5 parts of Chinese honeylocust fruit powder, 1 part of kasong, 1 part of defoaming agent (conventional commercial product) and 33 parts of water (urban tap meeting the national standard GB5749-2006 of drinking water).
Weighing the raw materials in proportion, adding water into a reaction kettle, and then sequentially adding the solid raw materials, wherein the adding method comprises the following steps: and adding the latter raw material after the former raw material is completely dissolved. Then, the liquid raw materials were sequentially added by the same addition method, and after all the raw materials were added, the mixture was stirred for 1 hour to obtain the water quality stabilizer. The water quality stabilizer belongs to a concentrated solution composition, and when the water quality stabilizer is used, water with the mass being 45-100 times that of the water is added to dilute the water solution to form a directly used stabilizer, and the directly used stabilizer is added into a water tank of a printing machine, so that the machine can be started to print normally.
Example 2:
a tap water offset printing water quality stabilizer comprises the following components (by weight portion):
6 parts of citric acid, 3 parts of sodium citrate, 3 parts of EDTA-2Na, 10 parts of gum arabic, 5 parts of xylitol, 30 parts of tea saponin, 5 parts of sodium hypochlorite, 5 parts of a defoaming agent (a conventional commercial product) and 33 parts of water (urban tap water meeting the national standard GB5749-2006 for drinking water).
Weighing the raw materials in proportion, adding water into a reaction kettle, and then sequentially adding the solid raw materials, wherein the adding method comprises the following steps: and adding the latter raw material after the former raw material is completely dissolved. Then, the liquid raw materials were sequentially added by the same addition method, and after all the raw materials were added, the mixture was stirred for 1.5 hours to obtain the water quality stabilizer.
Example 3:
a tap water offset printing water quality stabilizer comprises the following components (by weight portion):
3 parts of citric acid, 6 parts of sodium citrate, 2 parts of EDTA-2Na, 5 parts of CMC, 20 parts of beta-cyclodextrin, 10 parts of stearic acid, 3 parts of Kathon, 3 parts of a defoaming agent (a conventional commercial product) and 47 parts of water (urban tap water meeting the national standard GB5749-2006 for drinking water).
Weighing the raw materials in proportion, adding water into a reaction kettle, and then sequentially adding the solid raw materials, wherein the adding method comprises the following steps: and adding the latter raw material after the former raw material is completely dissolved. Then the liquid raw materials are added in turn by the same adding method, and after all the raw materials are added, the mixture is stirred for 2 hours to prepare the finished product water quality stabilizer.
Example 4:
a tap water offset printing water quality stabilizer comprises the following components (by weight portion):
1 part of citric acid, 8 parts of sodium citrate, 3 parts of EDTA-2Na, 1 part of gum arabic, 30 parts of maltose syrup, 6 parts of sitosterol, 0.5 part of kasong, 0.5 part of defoaming agent and 50 parts of water (urban tap water meeting the national standard of drinking water GB 5749-2006).
Weighing the raw materials in proportion, adding water into a reaction kettle, and then sequentially adding the solid raw materials, wherein the adding method comprises the following steps: and adding the latter raw material after the former raw material is completely dissolved. Then the liquid raw materials are added in turn by the same adding method, and after all the raw materials are added, the mixture is stirred for 2 hours to prepare the water quality stabilizer.
Example 5:
a concentrated solution composition of a tap water offset water quality stabilizer comprises the following components (by weight portion):
3 parts of citric acid, 5 parts of sodium citrate, 3 parts of EDTA-2Na, 10 parts of CMC, 20 parts of arabinose, 15 parts of oleic acid, 2 parts of sodium hypochlorite, 2 parts of a defoaming agent and 40 parts of water (urban tap water meeting the national standard GB5749-2006 for drinking water).
Weighing the raw materials in proportion, adding water into a reaction kettle, and then sequentially adding the solid raw materials, wherein the adding method comprises the following steps: and adding the latter raw material after the former raw material is completely dissolved. Then the liquid raw materials are added in turn by the same adding method, and after all the raw materials are added, the mixture is stirred for 2 hours to prepare the water quality stabilizer.
Example 6:
a tap water offset printing water quality stabilizer comprises the following components (by weight portion):
2 parts of citric acid, 4 parts of sodium citrate, 2 parts of EDTA-2Na, 3 parts of CMC, 10 parts of xylitol, 5 parts of arabinose, 12 parts of sterol, 2 parts of Kathon, 1 part of defoaming agent and 59 parts of water (urban tap water meeting the national standard GB5749-2006 for drinking water).
Weighing the raw materials in proportion, adding water into a reaction kettle, and then sequentially adding the solid raw materials, wherein the adding method comprises the following steps: and adding the latter raw material after the former raw material is completely dissolved. Then the liquid raw materials are added in turn by the same adding method, and after all the raw materials are added, the mixture is stirred for 2 hours to prepare the water quality stabilizer.
Comparative example 1
The effect of the water quality stability of the present invention was verified by using two comparative samples in comparison with the water quality stabilizer of the present invention.
The water quality stabilizer of example 1 was used as test sample 1.
The water quality stabilizer of example 2 was used as experimental sample 2.
The water quality stabilizer of example 3 was used as experimental sample 3.
The water quality stabilizer of example 4 was used as test sample 4.
The water quality stabilizer of example 5 was used as test sample 5.
The water quality stabilizer of example 6 was used as test sample 6.
City tap water meeting the national standard for drinking water GB5749-2006 was used directly as control a.
Comparative sample B was prepared using the method of example 1, except that the wetting enhancer white sugar was removed from the components.
Comparative sample C was prepared using the method of example 1, except that citric acid, sodium citrate, EDTA-2Na in the components were replaced with phosphate buffer, specifically: 2 parts of phosphoric acid and 8 parts of phosphate.
Alcohol was used as control D.
A commercially available brand of alcohol-free fountain solution was used as control E.
When the 11 samples are used, water with the mass being 49 times that of the samples is added to dilute the samples into 2 wt% aqueous solution, the aqueous solution is directly added into a water tank of a 45A newspaper rotary press of northern people, the normal starting printing is carried out, and parameters such as the number of printed sheets (printed sheets) from the starting to the stable printing state, the water amount (%) entering the stable printing state, the color difference of the printed matter, the residual VOCs of water in the water tank and the like are recorded. (the water used in each wetting mode is the same water, and meets the national standard for drinking water GB 5749-2006. the printing process, the type of the printing machine, the printing material, the printing operation and the like are the same.) in the printing process, the parameter indexes for representing the printing performance are obtained through measurement and observation, and are shown in the following table 1.
TABLE 1 measurement results of print Performance index
Note: 1. when the printing is stable, the printing water amount (%) is inversely proportional to the stability of the water film on the surface of the printing plate, and the more stable the water film is, the lower the printing water amount is; 2. VOCs are detected by a portable non-methane total hydrocarbon detector.
From table 1 the following conclusions can be drawn:
1. compared with a comparison sample A (city tap water), the experimental sample 1 has the advantages that the water film of the printing plate is remarkably stable, the printing water quantity is remarkably reduced, and the start-up waste newspaper is reduced by more than 80%.
2. The experimental sample 1 showed a 30% reduction in the amount of printing water as compared with the comparative sample B, and thus demonstrated that the wetting enhancer of the present invention has the effect of stabilizing the water film on the surface of the printing plate.
3. Compared with the comparative sample C, the experimental sample 1 has the advantages that the printing water amount is reduced by 40%, and the startup waste newspaper is reduced by 60-70%, so that the buffering agent disclosed by the invention can ensure the stable pH value of a wetting system, and also has the effects of cleaning and stabilizing printing.
4. Compared with a comparison sample D and a comparison sample E, the comprehensive experiment samples 1-6 have the advantages that the printing water amount is close, the starting waste is close, but the VOCs residues of the printed matter, the VOCs residues of the water tank water and the color difference of the printed matter are obviously reduced, and the technical effects of environmental protection, color difference reduction, hue stability improvement and printed matter quality improvement are achieved.
Claims (9)
1. The tap water offset printing water quality stabilizer is characterized by comprising the following components in 100 parts by weight: 5-17 parts of a buffering agent, 1-10 parts of a printing plate protective agent, 5-50 parts of a wetting reinforcing agent, 5-30 parts of a plate cleaning reinforcing agent, 0.5-5 parts of a bactericide, 0.5-5 parts of a defoaming agent and the balance of water; the moistening enhancer is one or more selected from maltose, glucose syrup, white sugar, maltose syrup, fructose-glucose syrup, arabinose, xylitol and cyclodextrin.
2. The water quality stabilizer according to claim 1, wherein the buffer comprises: citric acid, sodium citrate, EDTA-2Na, citric acid: sodium citrate: the weight ratio of EDTA-2Na is (1-6) to (3-8): (1-3).
3. A water quality stabilizer according to claim 1 or 2, wherein the plate cleaning enhancer is one or more selected from saponin extract, stearic acid, tea saponin, oleic acid, inferior sterol, sitosterol, SDS, SAS, and atlas.
4. A water quality stabilizer according to claim 1 or 2, wherein the plate cleaning enhancer is one or more selected from saponin extract, stearic acid, theasaponin, oleic acid, sulfinol and sitosterol.
5. The water quality stabilizer according to claim 1, wherein the printing plate protective agent is one or more selected from the group consisting of gum arabic, CMC, starch and polyacrylamide.
6. The water quality stabilizer according to claim 1, wherein the bactericide is one or more selected from the group consisting of cason, sodium hypochlorite, hydrogen peroxide and ozone.
7. The preparation method of the tap water offset printing water quality stabilizer is characterized in that the water quality stabilizer comprises the following raw materials in 100 parts by weight: 5-17 parts of a buffering agent, 1-10 parts of a printing plate protective agent, 5-50 parts of a wetting reinforcing agent, 5-30 parts of a plate cleaning reinforcing agent, 0.5-5 parts of a bactericide, 0.5-5 parts of a defoaming agent and the balance of water; the moistening enhancer is one or more selected from maltose, glucose syrup, white sugar, maltose syrup, fructose-glucose syrup, arabinose, xylitol and cyclodextrin;
the preparation method comprises the following steps:
weighing the raw materials in proportion, adding water into a reaction kettle, and then sequentially adding the raw materials, wherein the adding method comprises the following steps: and after the former raw material is completely dissolved, adding the latter raw material, and stirring to obtain the water quality stabilizer.
8. The method of using the water quality stabilizer according to claim 1, comprising the steps of: diluting the water quality stabilizer of claim 1 by adding water with the mass times of 45-100 times to obtain a stabilizer aqueous solution which is directly used, and adding the stabilizer aqueous solution into a water tank of a printing machine to normally start up the printing.
9. Use of the water quality stabilizer according to claim 1 or 2 for reducing color difference of printed matter, improving color stability, and improving quality of printed matter.
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