CN109719862B - Environment-friendly film ink cleaning method - Google Patents
Environment-friendly film ink cleaning method Download PDFInfo
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- CN109719862B CN109719862B CN201910054346.2A CN201910054346A CN109719862B CN 109719862 B CN109719862 B CN 109719862B CN 201910054346 A CN201910054346 A CN 201910054346A CN 109719862 B CN109719862 B CN 109719862B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The invention relates to the technical field of cleaning of printing and packaging materials, in particular to an environment-friendly method for cleaning film printing ink. The environment-friendly film ink cleaning method comprises the following steps: (1) stretching the film by using a traction stretching device; (2) brushing the stretched film by using a rotating brush; (3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink. The environment-friendly film ink cleaning method disclosed by the invention realizes the separation of ink and materials under the action of external force, and can achieve the effect of removing the ink by more than 99%. In the whole process of removing the printing ink, the printing ink separation can be realized without using solvents and alkali, the separated printing ink mixed solution is precipitated and filtered by a sedimentation tank, the printing ink and the water are separated, the separated printing ink can still be used for printing ink production after being treated, the water can be repeatedly produced and used, and the environment can not be polluted.
Description
Technical Field
The invention belongs to the technical field of cleaning of printing packaging materials, and particularly relates to an environment-friendly method for cleaning film printing ink.
Background
With the continuous development of economy, the quality of life of people is improved, higher requirements are put forward on product packaging, and a large number of plastic films and exquisite printed patterns are adopted. Therefore, the used plastic film is difficult to clean printing ink in the recycling process, the conventional method adopts chemical ink dissolving, namely soaking the plastic film with chemical liquid medicine to dissolve or corrode the surface of the plastic film, and washing with clean water after full soaking, and the cleaned liquid medicine contains toxic and harmful substances such as alkali, active agents and the like, has great influence on the environment and operators, and is not beneficial to protecting the environment. Therefore, there is an urgent need to develop an environment-friendly method for cleaning thin film inks.
Disclosure of Invention
In order to solve the problems, the invention provides an environment-friendly film ink cleaning method, which comprises the following steps:
(1) stretching the film by using a traction stretching device;
(2) brushing the stretched film by using a rotating brush;
(3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink.
As a preferable technical scheme, the ratio of the linear speed of the stretching roller of the traction stretching equipment to the linear speed of the film feeding roller in the step (1) is 2-3.
As a preferred technical scheme, the environmental temperature in the step (1) is 10-30 ℃.
As a preferable technical scheme, the film material in the step (1) is a polymer which can generate a thin neck when being stretched.
As a preferred technical scheme, the film material in the step (1) is selected from one or more of ABS, polyethylene, nylon, polycarbonate, rigid polyvinyl chloride and polystyrene blend.
As a preferred technical scheme, the environmental temperature in the step (1) is 10-80 ℃.
As a preferred technical scheme, the film material in the step (1) is selected from one or more of polystyrene, polymethyl methacrylate, phenolic resin, polypropylene, rubber, ABS, polyethylene, nylon, polycarbonate, rigid polyvinyl chloride and polystyrene blend.
As a preferable technical scheme, the component A is added in the brushing process in the step (2).
As a preferred technical scheme, the component A comprises modified diatomite.
As a preferred technical scheme, the component A also comprises a cationic polymer.
Has the advantages that: by utilizing the environment-friendly film ink cleaning method, the ink and the material are separated under the action of external force, and the effect of removing the ink can reach more than 99 percent. In the whole process of removing the printing ink, the printing ink separation can be realized without using solvents and alkali, the separated printing ink mixed solution is precipitated and filtered by a sedimentation tank, the printing ink and the water are separated, the separated printing ink can still be used for printing ink production after being treated, the water can be repeatedly produced and used, and the environment can not be polluted.
Detailed Description
The technical features of the technical solutions provided by the present invention are further clearly and completely described below with reference to the specific embodiments, and the scope of protection is not limited thereto.
The words "preferred", "more preferred", and the like, in the present invention refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
In order to solve the problems, the invention provides an environment-friendly film ink cleaning method, which comprises the following steps:
(1) stretching the film by using a traction stretching device;
(2) brushing the stretched film by using a rotating brush;
(3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink.
In a preferred embodiment, the ratio of the linear speed of the stretching roller to the linear speed of the film feeding roller of the traction stretching device in the step (1) is 2-3.
In a preferred embodiment, the ambient temperature in step (1) is from 10 to 30 ℃.
In a preferred embodiment, the film material in step (1) is a polymer capable of producing a narrow neck upon stretching.
The thin neck refers to the phenomenon that the material is locally thinned after the material is stressed and yields.
In some embodiments, the film material in step (1) is selected from one or more of polystyrene, polymethyl methacrylate, phenolic resin, polypropylene, rubber, ABS, polyethylene, nylon, polycarbonate, rigid polyvinyl chloride, and polystyrene blend.
In a preferred embodiment, the film material in step (1) is selected from one or more of ABS, polyethylene, nylon, polycarbonate, rigid polyvinyl chloride and polystyrene blend.
In a preferred embodiment, the method for cleaning the environment-friendly thin film ink comprises the following steps:
(1) stretching the film by using a traction stretching device, wherein the ratio of the linear speed of a stretching roller of the traction stretching device to the linear speed of a film feeding roller is 2-3;
(2) brushing the stretched film by using a rotating brush;
(3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink.
The ABS is a terpolymer of acrylonitrile (A), butadiene (B) and styrene (S); the polyethylene (PE for short) is a thermoplastic resin obtained by polymerizing ethylene, and industrially, also includes a copolymer of ethylene and a small amount of α -olefin; the nylon, namely polyamide (PA for short), is a general name of thermoplastic resin containing a repeated amide group- (NHCO-) on a molecular main chain, and comprises aliphatic PA, aliphatic-aromatic PA and aromatic PA; the polycarbonate (PC for short) is a high molecular polymer containing carbonate groups in molecular chains, and can be divided into various types such as aliphatic, aromatic, aliphatic-aromatic and the like according to the structure of the ester groups; the rigid polyvinyl chloride is prepared by adding certain additives (such as a stabilizer, a lubricant, a filler and the like) into amorphous thermoplastic resin prepared by polymerization of vinyl chloride monomers; the polystyrene (PS for short) refers to a polymer synthesized by styrene monomer through free radical addition polymerization.
The inventor of the application finds that the difficulty degree of ink removal can be changed to a certain extent at different temperatures, surface molecules of the material are rearranged under an external force condition in the stretching process to generate a large amount of heat energy, when the external environment temperature is 10-30 ℃, the surface temperature of the material does not reach the softening temperature, the surface is still in a solid state, the ink is separated from the surface of the material, and the ink is still separated from the material after cooling, and at the moment, the ink is easy to remove.
The inventor considers that under the condition, the surface of a film material generates certain deformation to the extent, when the material reaches a yield point, the material rapidly generates plastic deformation, internal molecules are arranged to perform longitudinal orientation, and a large amount of heat is generated, at the moment, the stretching temperature generated by the material is below the glass transition temperature of the material, the surface of the material cannot generate a softened state, the ink and connecting resin are still in a solid state, and the ink and the surface of the material generate relative displacement, so that the ink is separated from the surface of the material.
In a preferred embodiment, the ambient temperature in step (1) is from 10 to 80 ℃.
In a preferred embodiment, the film material in step (1) is selected from one or more of polystyrene, polymethyl methacrylate, phenolic resin, polypropylene, rubber, ABS, polyethylene, nylon, polycarbonate, rigid polyvinyl chloride and polystyrene blend.
The inventor of the present application found in the research process that when the ambient temperature is greater than 30 ℃, the ink cannot be completely removed from the surface of the film material under the same conditions, and the analysis principle is that the surface molecules of the material are rearranged under the external force condition during the stretching process to generate a large amount of heat energy, when the external ambient temperature is increased, the surface temperature of the material reaches the softening temperature, the surface is in a fluid viscous state, the ink still adheres to the surface of the material, and the ink still adheres to the material after cooling, so that the ink cannot be removed, so the inventor further optimizes the method.
In a preferred embodiment, the component A is added during the brushing in step (2).
In a preferred embodiment, the a component comprises modified diatomaceous earth.
The chemical components of the diatomite of the invention are mainly SiO2Containing a small amount of Al2O3、Fe2O3CaO, MgO, etc., and organic matter.
In a preferred embodiment, the modified diatomaceous earth is quaternary ammonium salt modified diatomaceous earth; preferably, the quaternary ammonium salt is alkyl dimethyl benzyl quaternary ammonium salt; more preferably, the alkyl number of the alkyl dimethyl benzyl quaternary ammonium salt is 10 to 16;
wherein the alkyl number of the alkyl group is 10-16 alkyl dimethyl benzyl quaternary ammonium salt includes but is not limited to: dodecyl dimethyl benzyl ammonium chloride, dodecyl dimethyl benzyl ammonium bromide, tetradecyl dimethyl benzyl ammonium chloride and tetradecyl dimethyl benzyl ammonium bromide.
In a preferred embodiment, the modified diatomite is diatomite modified by dodecyl dimethyl benzyl ammonium chloride, and can be prepared by the following method: firstly, roasting natural diatomite in a muffle furnace at 450 ℃ for 2 hours, grinding, and sieving with a 65-mesh sieve to remove organic impurities; then adding alkyl dimethyl benzyl quaternary ammonium salt and distilled water into the roasted diatomite, adjusting the pH value of the system to 8, and heating for 20min at 60 ℃ under the stirring condition; then precipitating, cooling, carrying out suction filtration by using a vacuum suction filter, drying a filter cake at 100 ℃, and grinding to obtain modified diatomite; wherein the adding amount of the distilled water is that 1g of quaternary ammonium salt is added into 100mL of distilled water; the weight ratio of the diatomite to the dodecyl dimethyl benzyl quaternary ammonium salt is 1: 0.4.
In order to remove the ink at a higher temperature, the diatomite is added in the brushing process in the step (2), the diatomite is light and porous, has a large specific surface area, can adsorb various compounds, is insoluble in water, can be removed by precipitation, does not pollute water, and is relatively environment-friendly, but because the diatomite is negatively charged, the ink contains negatively charged substances, and cannot effectively adsorb the ink, so that in the research process, the diatomite is modified by the inventor, and the diatomite modified by alkyl dimethyl benzyl ammonium chloride has a better removal rate on the ink.
In a preferred embodiment, the a component further comprises a cationic polymer; the addition amount of the component A is 0.2-0.5 wt% of the film material.
The cationic polymers of the present invention are generic terms for reactions that produce polymerization by cationic initiation.
In a preferred embodiment, the cationic polymer is selected from one or more of acrylamidopropyltrimethylammonium chloride/acrylamide copolymers, starch hydroxypropyltrimethylammonium chloride, polyquaternium-74.
In a preferred embodiment, the cationic polymer is an acrylamidopropyl trimethyl ammonium chloride/acrylamide copolymer.
In a preferred embodiment, the weight ratio of the modified diatomite to the acrylamido propyl trimethyl ammonium chloride/acrylamide copolymer is 1 (0.5-1.5).
The inventor of the present application finds in the process of research that when a certain amount of the cationic polymer is mixed in the modified diatomite, the removal rate of the ink on the surface of the film material can reach more than 99%, and the inventor thinks that the surface of the material forms tiny ink anchor points after corona treatment, when the temperature is higher, the channels are easy to adhere, and the modified diatomite and the cationic polymer are mutually crosslinked, so that the viscosity is increased, the pseudo-dilatant behavior is generated, and the removal of the ink anchor points is positively influenced.
In a preferred embodiment, the B component is added during the brushing process of the step (3); the weight ratio of the component A to the component B is 1: 1.5-3.
In a preferred embodiment, the B component is modified mesoporous silica.
The silicon dioxide is solid at normal temperature and has a chemical formula of SiO2The silica sol is insoluble in water and acid, but soluble in hydrofluoric acid and hot concentrated phosphoric acid, can react with molten alkali, and has two types of crystalline silica and amorphous silica in nature.
In a preferred embodiment, the modified mesoporous silica is alkylbenzenesulfonic acid modified mesoporous silica; preferably, the alkylbenzene sulfonic acid is dodecylbenzene sulfonic acid.
In a preferred embodiment, the dodecylbenzene sulfonic acid modified mesoporous silica is prepared by the following method: dissolving alkyl benzene sulfonic acid in a sodium fluoride/hydrochloric acid solution, stirring at 35 ℃ until the solution is clear and transparent, then dropwise adding TEOS into the solution under the condition of high-speed stirring, continuously stirring for 2h, transferring the reaction solution into a reaction kettle with a tetrafluoroethylene lining, standing for 24h at a constant temperature of 100 ℃, taking out, naturally cooling, washing, drying for later use, and calcining for 5h at 600 ℃ to obtain the catalyst. The molar ratio of the dodecylbenzene sulfonic acid to the TEOS to the sodium fluoride/hydrochloric acid solution is 1:7:1120, the molar ratio of the sodium fluoride to the hydrochloric acid is 5:7, and the TEOS is tetraethoxysilane.
The inventor of the application finds that the modified mesoporous silica is added in the brushing process in the step (3), so that the separated ink mixed solution is precipitated and filtered in a precipitation tank, and then the ink and the water can be separated, the process is simple and environment-friendly, on one hand, due to the existence of the component B, the component B interacts with the component A, the ink washed by the brushing can be removed by standing and precipitating, the post-treatment process of water is omitted, and the separated water can be used for repeated production, so that the resources are effectively saved; on the other hand, the component B and the component A can be in full contact, so that ink molecules can be quickly separated from the surface of the material, hydrophobic micro-regions are formed in a water phase and are mutually aggregated, the component A cannot be remained on a film material, and the environment is very environment-friendly.
The present invention will be described in detail with reference to examples, and in addition, if not otherwise stated, the raw materials used are commercially available, wherein the width of the film material sample is 25mm, the length is 150mm, the thickness is 0.15mm, the ink adhesion is strong, the material surface is corona-treated, and the ink cannot be removed by using a box sealing tape.
Examples
Example 1
Embodiment 1 provides an environment-friendly method for cleaning thin-film ink, comprising the following steps:
(1) stretching the film by using a traction stretching device, wherein the ratio of the linear speed of a stretching roller of the traction stretching device to the linear speed of a film feeding roller is 2;
(2) brushing the stretched film by using a rotating brush;
(3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink.
Wherein the film material is ABS, model number Enlish ABS 308, purchased from Enlish ABS corporation.
Example 2
Embodiment 2 provides an environment-friendly method for cleaning thin-film ink, comprising the following steps:
(1) stretching the film by using a traction stretching device, wherein the ratio of the linear speed of a stretching roller of the traction stretching device to the linear speed of a film feeding roller is 3;
(2) brushing the stretched film by using a rotating brush;
(3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink.
Wherein the film material is polycarbonate, the type is DuPont Dow 301EP-30, and is purchased from DuPont Dow company.
Example 3
Embodiment 3 provides an environment-friendly method for cleaning thin film ink, comprising the following steps:
(1) stretching the film by using a traction stretching device, wherein the ratio of the linear speed of a stretching roller of the traction stretching device to the linear speed of a film feeding roller is 2;
(2) brushing the stretched film by using a rotating brush;
(3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink.
Wherein the film material is polyethylene, and the model is DuPont Dow 4201, which is purchased from DuPont Dow company.
Example 4
Example 4 provides an environment-friendly method for cleaning thin film ink, which is the same as example 1 except that: the film material is a mixture of polyethylene and nylon, and the weight ratio of the polyethylene to the nylon is 6: 1; the polyethylene, model number Dow DuPont 4201, was purchased from Dow DuPont; the nylon, model is ba ling petrochemical YH3200, purchased from ba ling petrochemical llc, a petrochemical group of china.
Example 5
Embodiment 5 provides an environment-friendly method for cleaning thin film ink, comprising the following steps:
(1) stretching the film by using a traction stretching device, wherein the ratio of the linear speed of a stretching roller of the traction stretching device to the linear speed of a film feeding roller is 2;
(2) brushing the stretched film by using a rotating brush;
(3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink.
The component A is added in the brushing process in the step (2), and the addition amount of the component A is 0.2 wt% of the film material; the component A comprises modified diatomite and acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer; the weight ratio of the modified diatomite to the acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer is 1: 0.5.
The modified diatomite is diatomite modified by dodecyl dimethyl benzyl ammonium chloride and can be prepared by the following method: firstly, roasting natural diatomite in a muffle furnace at 450 ℃ for 2 hours, grinding, and sieving with a 65-mesh sieve to remove organic impurities; then adding alkyl dimethyl benzyl quaternary ammonium salt and distilled water into the roasted diatomite, adjusting the pH value of the system to 8, and heating for 20min at 60 ℃ under the stirring condition; then precipitating, cooling, carrying out suction filtration by using a vacuum suction filter, drying a filter cake at 100 ℃, and grinding to obtain modified diatomite; wherein the adding amount of the distilled water is that 1g of quaternary ammonium salt is added into 100mL of distilled water; the weight ratio of the diatomite to the dodecyl dimethyl benzyl quaternary ammonium salt is 1: 0.4.
The acrylamidopropyltrimethylammonium chloride/acrylamide copolymers are purchased from Shanghai Shuzo industries, Inc.
Adding a component B in the brushing process in the step (3), wherein the weight ratio of the component A to the component B is 1: 2; the component B is modified mesoporous silicon dioxide; the modified mesoporous silica is dodecyl benzene sulfonic acid modified mesoporous silica.
The dodecyl benzene sulfonic acid modified mesoporous silica is prepared by the following method: dissolving alkyl benzene sulfonic acid in a sodium fluoride/hydrochloric acid solution, stirring at 35 ℃ until the solution is clear and transparent, then dropwise adding TEOS into the solution under the condition of high-speed stirring, continuously stirring for 2h, transferring the reaction solution into a reaction kettle with a tetrafluoroethylene lining, standing for 24h at a constant temperature of 100 ℃, taking out, naturally cooling, washing, drying for later use, and calcining for 5h at 600 ℃ to obtain the catalyst. The molar ratio of the dodecylbenzene sulfonic acid to the TEOS to the sodium fluoride/hydrochloric acid solution is 1:7:1120, the molar ratio of the sodium fluoride to the hydrochloric acid is 5:7, and the TEOS is tetraethoxysilane.
Wherein the thin film material is polystyrene, model LG chemical 50ISI, purchased from LG chemical company, Korea.
Example 6
Embodiment 6 provides an environment-friendly method for cleaning thin film ink, comprising the following steps:
(1) stretching the film by using a traction stretching device, wherein the ratio of the linear speed of a stretching roller of the traction stretching device to the linear speed of a film feeding roller is 2;
(2) brushing the stretched film by using a rotating brush;
(3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink.
The component A is added in the brushing process in the step (2), and the addition amount of the component A is 0.2 wt% of the film material; the component A comprises modified diatomite and acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer; the weight ratio of the modified diatomite to the acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer is 1: 1.2.
The modified diatomite is diatomite modified by dodecyl dimethyl benzyl ammonium chloride, and the preparation steps are the same as those of the example 5; the acrylamidopropyltrimethylammonium chloride/acrylamide copolymers are purchased from Shanghai Shuzo industries, Inc.
Adding a component B in the brushing process in the step (3), wherein the weight ratio of the component A to the component B is 1: 2; the component B is modified mesoporous silicon dioxide; the modified mesoporous silica is dodecyl benzene sulfonic acid modified mesoporous silica.
The preparation steps of the dodecylbenzene sulfonic acid modified mesoporous silica are the same as those of example 5.
Wherein the film material is rubber, the model is Coxiella 359X, and the film material is purchased from Coxiella Polymer (China) Co.
Example 7
Embodiment 7 provides an environment-friendly method for cleaning thin film ink, comprising the following steps:
(1) stretching the film by using a traction stretching device, wherein the ratio of the linear speed of a stretching roller of the traction stretching device to the linear speed of a film feeding roller is 2;
(2) brushing the stretched film by using a rotating brush;
(3) and washing the surface of the brushed film by using an efficient water squeezing device to remove the ink.
The component A is added in the brushing process in the step (2), and the addition amount of the component A is 0.2 wt% of the film material; the component A comprises modified diatomite and acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer; the weight ratio of the modified diatomite to the acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer is 1: 1.5.
The modified diatomite is diatomite modified by dodecyl dimethyl benzyl ammonium chloride, and the preparation steps are the same as those of the example 5; the acrylamidopropyltrimethylammonium chloride/acrylamide copolymers are purchased from Shanghai Shuzo industries, Inc.
Adding a component B in the brushing process in the step (3), wherein the weight ratio of the component A to the component B is 1: 2; the component B is modified mesoporous silicon dioxide; the modified mesoporous silica is dodecyl benzene sulfonic acid modified mesoporous silica.
The preparation steps of the dodecylbenzene sulfonic acid modified mesoporous silica are the same as those of example 5.
Wherein the thin film material is polystyrene, model LG chemical 50ISI, purchased from LG chemical company, Korea.
Comparative example 1
Comparative example 1 provides an environment-friendly method for cleaning a thin film ink, which is the same as example 1 except that: the ratio of the linear speed of the stretching roller of the traction stretching equipment to the linear speed of the film feeding roller is 0.2.
Wherein the film material is ABS, model number Enlish ABS 308, purchased from Enlish ABS corporation.
Comparative example 2
Comparative example 2 provides an environment-friendly method for cleaning a thin film ink, which is the same as example 1 except that: the ratio of the linear speed of the stretching roller of the traction stretching equipment to the linear speed of the film feeding roller is 15.
Wherein the film material is ABS, model number Enlish ABS 308, purchased from Enlish ABS corporation.
Comparative example 3
Comparative example 3 provides an environment-friendly method for cleaning a thin film ink, which is the same as example 1 except that: the film material was rubber, model number was kesichu 359X, purchased from kesichu polymer (china) ltd.
Comparative example 4
Comparative example 4 provides an environment-friendly method for cleaning a thin film ink, which is the same as example 5 except that: the ratio of the linear speed of the stretching roller of the traction stretching equipment to the linear speed of the film feeding roller is 0.2.
Comparative example 5
Comparative example 5 provides an environment-friendly method for cleaning a thin film ink, which is the same as example 5 except that: the ratio of the linear speed of the stretching roller of the traction stretching equipment to the linear speed of the film feeding roller is 15.
Comparative example 6
Comparative example 6 provides an environment-friendly method for cleaning a thin film ink, which is the same as example 5 except that: the addition amount of the component A is 0 wt% of the film material.
Comparative example 7
Comparative example 7 provides an environment-friendly method for cleaning a thin film ink, which is the same as example 5 except that: the weight ratio of the component A to the component B is 1: 0.01.
Comparative example 8
Comparative example 8 provides an environmentally friendly method of cleaning thin film ink, which is the same as example 5 except that: the weight ratio of the modified diatomite to the acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer is 1: 0.01.
Comparative example 9
Comparative example 9 provides an environmentally friendly method of cleaning thin film ink, which is the same as example 5 except that: the weight ratio of the modified diatomite to the acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer is 1: 15.
Evaluation of Performance
1. Evaluation of ink removing effect: the cleaning methods of examples and comparative examples were repeated six times at ambient temperatures of 10 c, 30 c, 50 c, and 80 c, respectively, and the areas of the ink unremoved areas were recorded, and the results were averaged.
TABLE 1
| Examples | 10 ℃ removal Effect/%) | 30 ℃ removal Effect/% | 50 ℃ removal Effect/%) | 80 ℃ removal Effect/% |
| Example 1 | 0.5 | 0.7 | 10.3 | 15.6 |
| Example 2 | 0.4 | 0.4 | 8.2 | 13.7 |
| Example 3 | 0.5 | 0.5 | 9.2 | 15.5 |
| Example 4 | 0.4 | 0.6 | 7.8 | 18.3 |
| Example 5 | 0.3 | 0.3 | 0.5 | 0.7 |
| Example 6 | 0.2 | 0.4 | 0.6 | 0.8 |
| Example 7 | 0 | 0.2 | 0.4 | 0.7 |
| Comparative example 1 | 5.5 | 6.6 | 9.2 | 16.5 |
| Comparative example 2 | 8.8 | 10.1 | 12.8 | 18.3 |
| Comparative example 3 | 7.3 | 8.2 | 11.7 | 14.9 |
| Comparative example 4 | 5.7 | 6.2 | 10.1 | 17.4 |
| Comparative example 5 | 7.6 | 8.7 | 10.4 | 18.9 |
| Comparative example 6 | 10.2 | 13.3 | 18.5 | 27.8 |
| Comparative example 7 | 4.1 | 7.7 | 11.6 | 20.2 |
| Comparative example 8 | 4.8 | 7.1 | 10.8 | 18.6 |
| Comparative example 9 | 3.2 | 5.7 | 9.2 | 15.4 |
Claims (1)
1. An environment-friendly film ink cleaning method is characterized by comprising the following steps:
(1) stretching the film by using a traction stretching device, wherein the ratio of the linear speed of a stretching roller of the traction stretching device to the linear speed of a film feeding roller is 2;
(2) brushing the stretched film by using a rotating brush;
(3) flushing the surface of the brushed film by using an efficient water squeezing device to remove ink;
the environmental temperature in the step (1) is 10-80 ℃;
the component A is added in the brushing process in the step (2), and the addition amount of the component A is 0.2 wt% of the film material; the component A comprises modified diatomite and acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer; the weight ratio of the modified diatomite to the acrylamide propyl trimethyl ammonium chloride/acrylamide copolymer is 1: 1.5;
the modified diatomite is diatomite modified by dodecyl dimethyl benzyl ammonium chloride and can be prepared by the following method: firstly, roasting natural diatomite in a muffle furnace at 450 ℃ for 2 hours, grinding, and sieving with a 65-mesh sieve to remove organic impurities; then adding alkyl dimethyl benzyl quaternary ammonium salt and distilled water into the roasted diatomite, adjusting the pH value of the system to 8, and heating for 20min at 60 ℃ under the stirring condition; then precipitating, cooling, carrying out suction filtration by using a vacuum suction filter, drying a filter cake at 100 ℃, and grinding to obtain modified diatomite; wherein the adding amount of the distilled water is that 1g of quaternary ammonium salt is added into 100mL of distilled water; the weight ratio of the diatomite to the dodecyl dimethyl benzyl quaternary ammonium salt is 1: 0.4;
adding a component B in the washing process in the step (3), wherein the weight ratio of the component A to the component B is 1: 2; the component B is modified mesoporous silicon dioxide; the modified mesoporous silica is dodecyl benzene sulfonic acid modified mesoporous silica;
the dodecyl benzene sulfonic acid modified mesoporous silica is prepared by the following method: dissolving alkyl benzene sulfonic acid in a sodium fluoride/hydrochloric acid solution, stirring at 35 ℃ until the solution is clear and transparent, then dropwise adding TEOS into the solution under the condition of high-speed stirring, continuously stirring for 2 hours, transferring the reaction solution into a reaction kettle with a tetrafluoroethylene liner, standing for 24 hours at a constant temperature of 100 ℃, taking out, naturally cooling, washing, drying for later use, and calcining for 5 hours at 600 ℃ to obtain the product; the molar ratio of the dodecylbenzene sulfonic acid to the TEOS to the sodium fluoride/hydrochloric acid solution is 1:7:1120, the molar ratio of the sodium fluoride to the hydrochloric acid is 5:7, and the TEOS is tetraethoxysilane;
the film material is polystyrene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910054346.2A CN109719862B (en) | 2019-01-21 | 2019-01-21 | Environment-friendly film ink cleaning method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910054346.2A CN109719862B (en) | 2019-01-21 | 2019-01-21 | Environment-friendly film ink cleaning method |
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| Publication Number | Publication Date |
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| CN109719862A CN109719862A (en) | 2019-05-07 |
| CN109719862B true CN109719862B (en) | 2022-02-08 |
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