Method for prolonging storage time of residual ink
By adding specific additives to the polyurethane ink with curing agent and stirring and filtration, the problem of ink curing in a short time is solved, extending the storage time of the ink, allowing it to meet printing needs within 10 days, and reducing printing costs .
Patent Information
- Application Number
- CN202411415737.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-02-14
AI Technical Summary
In the prior art, polyurethane inks with added curing agents cure in a short time, resulting in the unusable use of the remaining ink, causing waste and burden.
By adding a specific additive to the polyurethane ink with a curing agent and filtration, the obtained product is stored at an environment of 0-4°C to extend the storage time of the ink. The additives are homopolymers of n-propyl ester, ethyl acetate, 1,3-diisocyanate toluene and 1,6-diisocyanate hexane.
This method greatly improves the performance retention time of ink in low temperature environments, extends the time when the remaining ink can meet the printing usage requirements to 10 days, and can be mixed with new inks, reducing printing costs and waste.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of ink, in particular to a method for prolonging the storage time of residual ink. Background Art
[0002] Ink curing agents are widely used in the printing field. They can increase the curing speed of inks and enhance the durability and quality of printed products. By using inks with added curing agents, printed products can have better wear resistance, chemical resistance and light resistance, thus meeting the requirements of printed product quality in different fields. However, inks with added curing agents have a short shelf life. Usually, the ink will solidify 6-8 hours after adding the curing agent.
[0003] During the printing process, barreled polyurethane ink often cannot be used up after adding curing agent, and the remaining ink will solidify in a short time and cannot be used, causing a great burden and waste. Currently, the industry lacks a method that can effectively increase the shelf life of the remaining ink.
[0004] Therefore, the above defects are problems that need to be solved urgently by those skilled in the art. Summary of the invention
[0005] In order to overcome the shortcomings of the background technology, the present invention discloses a method for prolonging the storage time of residual ink.
[0006] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: A method for extending the storage time of residual ink, characterized in that: an auxiliary agent is added to the polyurethane ink according to 2-5% of the mass of the polyurethane ink to which a curing agent has been added, and the mixture is stirred and filtered to obtain a product, and the product is stored in an environment of 0-4°C; the auxiliary agent is composed of 6-8 parts of n-propyl ester and 2-3 parts of ethyl acetate in parts by weight, and the additive is 0.2-0.3 parts of 1,3-diisocyanatotoluene and 0.005-0.01 parts of a homopolymer of 1,6-diisocyanatohexane.
[0007] Preferably, the stirring filtration is performed so that the fineness of the mixture is ≤25 um.
[0008] Preferably, the mesh size of the filter used in the stirring filtration is ≤500 meshes.
[0009] Preferably, the polyurethane ink to which a curing agent is added can be selected from polyurethane ink to which a curing agent is added for no more than 8 hours without agglomeration or polyurethane ink to which a curing agent is added and stored at 0-4° C. for no more than 3 days without agglomeration.
[0010] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects: The present invention uses a specific treatment method and a unique auxiliary agent composition to greatly improve the retention time of various properties of polyurethane ink with added curing agent in a low temperature environment, and can extend the time that the remaining ink meets the printing requirements to 10 days, and can be mixed with new ink for color matching.
[0011] The process of the invention is simple, and the invention can be directly applied to the polyurethane ink to which the curing agent is added and which is left over during printing, thereby reducing the printing cost and the waste during printing. DETAILED DESCRIPTION Example 1
[0012] A method for extending the storage time of residual ink, comprising adding an auxiliary agent having a weight ratio of 100:4, which is composed of 7 parts of n-propyl ester and 2 parts of ethyl acetate, and an additive of 0.28 parts of 1,3-diisocyanatotoluene and 0.008 parts of a homopolymer of 1,6-diisocyanatohexane, to a polyurethane ink that has been added with a curing agent and stored at 4°C for 2 days, stirring and filtering to obtain a product, and storing the product in an environment at 4°C; Example 2
[0013] A method for extending the storage time of residual ink, comprising adding an auxiliary agent having a weight ratio of 100:2 and a composition of 8 parts of n-propyl ester and 3 parts of ethyl acetate, and an additive of 0.3 parts of 1,3-diisocyanatotoluene and 0.01 parts of a homopolymer of 1,6-diisocyanatohexane to a polyurethane ink to which a curing agent has been added and stored at 0°C for one day, stirring and filtering to obtain a product, and storing the product in an environment of 2°C. Example 3
[0014] A method for extending the storage time of residual ink, comprising adding an auxiliary agent having a weight ratio of 100:5 and a composition of 7.5 parts of n-propyl ester and 2.5 parts of ethyl acetate, and an additive of 0.2 parts of 1,3-diisocyanatotoluene and 0.005 parts of a homopolymer of 1,6-diisocyanatohexane to a polyurethane ink added with a curing agent and stored at 2°C for 3 days, stirring and filtering to obtain a product, and storing it in an environment of 3°C.
[0015] Comparative Example 1 The polyurethane ink with newly added curing agent should be stored in a normal environment of 22±2℃.
[0016] The performance of Example 1 and Comparative Example 1 were compared at the same storage time. The tinting strength and hue were compared with the initial state of Comparative Example 1 as the benchmark 1, the fluidity was measured by the viscosity in seconds using a 3# Zahn cup as the result, the saturation was compared with the initial state of Comparative Example 1 as the benchmark 100%, the fineness was based on the industry standard, and the tinting strength was based on the printing industry standard as the benchmark 1, to obtain the data in Table 1.
[0017] Table 1 Ink performance comparison table
[0018] It can be seen from Table 1 that the ink treated by the technical solution of the present invention can still meet the printing requirements when stored for 10 days, and can have the performance for a longer storage time. However, the performance of Comparative Example 1 can no longer meet the printing requirements after being stored for 1 day.
[0019] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.
Claims
1. A method for extending the storage time of residual ink, characterized in that: Add an auxiliary agent to the polyurethane ink according to 2-5% of the mass of the polyurethane ink to which the curing agent has been added, stir and filter, obtain a product and store it in an environment of 0-4°C; the auxiliary agent is composed of 6-8 parts of n-propyl ester and 2-3 parts of ethyl acetate in parts by weight, and the additive is 0.2-0.3 parts of 1,3-diisocyanatotoluene and 0.005-0.01 parts of a homopolymer of 1,6-diisocyanatohexane.
2. The method for extending the storage time of residual ink as claimed in claim 1, characterized in that: The stirring filtration is to make the mixture fineness ≤25um.
3. The method for extending the storage time of residual ink as claimed in claim 1, characterized in that: The mesh number of the filter used in the stirring filtration is ≤500 meshes.
4. The method for extending the storage time of residual ink as claimed in claim 1, characterized in that: The polyurethane ink with added curing agent can be selected from polyurethane ink with added curing agent for no more than 8 hours without agglomeration or polyurethane ink with added curing agent stored at 0-4° C. for no more than 3 days without agglomeration.