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Cross-linking agent as well as preparation method and application thereof

A cross-linking agent and reaction technology, applied in the field of cross-linking agent and its preparation, can solve the problems of printing force plate-making contrast, increase environmental protection pressure, low chemical development or on-machine development ability, etc., achieve strong hydrolysis resistance, improve Imaging ability, green development effect

Pending Publication Date: 2021-12-24
LUCKY HUAGUANG GRAPHICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The double-layer environment-friendly thermal plate is generally based on the double-bond free radical imaging mechanism. In order to reduce the effect of oxygen on the free radical reaction, the plate is equipped with an oxygen barrier protective layer. The advantage is that the plate has high printing resistance, but the disadvantage is that it needs Double-layer coating, high production process control requirements, low product yield, and the disposal of defective products generated in the production process will cause environmental pollution, which indirectly increases the pressure on environmental protection
[0015] The single-layer environment-friendly thermal plate is generally based on the non-oxygen inhibition polymerization imaging mechanism, and the plate does not need to be equipped with an oxygen barrier protective layer. Its advantages are single-layer coating, simple production process of the plate, high yield, and high printing durability. The disadvantages are The imaging capability of the imaging material is high, and the insufficient imaging capability of the imaging material often affects the environmental protection performance and printing force of the thermal plate
[0016] At present, the common problems of environmental-friendly thermal plates: 1. The problem of dot restoration accuracy; 2. The problem of low chemical development or on-machine developing ability; 3. The problem of uniformity of color reproduction; 4. The problem of printing durability; 5. plate making contrast problem

Method used

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  • Cross-linking agent as well as preparation method and application thereof
  • Cross-linking agent as well as preparation method and application thereof
  • Cross-linking agent as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0032] The raw materials for the preparation of the crosslinking agent include dicyclohexylmethane diisocyanate, dibutyltin dilaurate, ethyl-3-oxetanemethanol and ε-caprolactam. Since the synthesized cross-linking agent is a specific compound, it is enough to synthesize the specific compound according to the raw material, and the ratio of the raw material will only affect the yield of the product.

[0033]The preparation method of the cross-linking agent, the preparation method of the cross-linking agent, heating dicyclohexylmethane diisocyanate, dibutyltin dilaurate, and solvent to 35°C-80°C, adding ethyl-3-oxetane dropwise Cyclomethanol was reacted, and then ε-caprolactam was added to react until the peak at 2275 of the active isocyanate group detected by infrared spectroscopy disappeared, and a solution containing a crosslinking agent was obtained.

[0034] The preparation method of the crosslinking agent comprises heating dicyclohexylmethane diisocyanate, dibutyltin dilaur...

Embodiment 1

[0064] Example 1 (special thermosensitive resin L1)

[0065] Add 300g of dimethylacetamide, 80g (80% by weight) of methacrylamide, 10g (10% by weight) of hydroxyethyl acetamide to a 500ml four-necked flask equipped with temperature-controlled heating, mechanical stirring, reflux and nitrogen protection. Acrylamide, 10g (10% by weight) of 3,4-epoxycyclohexyl methacrylate, and 1g of azobisisobutyronitrile were stirred evenly, and reacted at 70°C for 8 hours, and the reaction was completed by cooling down, and the reaction stock solution could be used directly.

Embodiment 2

[0066] Example 2 (special thermosensitive resin L2)

[0067] Add 300g of dimethylacetamide, 70g (70% by weight) of methacrylamide, 20g (20% by weight) of hydroxyethyl methacrylamide to a 500ml four-necked flask with temperature-controlled heating, mechanical stirring, condensing reflux and nitrogen protection device Acrylamide, 10g (10% by weight) of 3,4-epoxycyclohexyl methacrylate, and 1g of azobisisobutyronitrile were stirred evenly, and reacted at 70°C for 8 hours, and the reaction was completed by cooling down, and the reaction stock solution could be used directly.

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Abstract

The invention provides a cross-linking agent and a preparation method and application thereof, the cross-linking agent contains a urethane bond structure, and a coating polymer after a cross-linking reaction has wear resistance of polyurethane resin; the cross-linking agent has an epoxy bond with a four-membered ring structure, and is high in activity and high in hydrolysis resistance; the cross-linking agent contains a caprolactam group, and the caprolactam group endows the cross-linking agent with certain hydrophilicity, so that a coating which is not thermally cross-linked is easier to be removed by water, and green and environment-friendly development is realized; and the cross-linking agent has the characteristic of releasing active isocyanate groups after being heated, and can be subjected to a cross-linking reaction with active hydrogen in the polymer, such as hydrogen in hydroxyl.

Description

technical field [0001] The invention belongs to the technical field of lithographic printing, and in particular relates to a crosslinking agent and its preparation method and application. Background technique [0002] For a long time, my country's printing industry, especially the packaging printing industry, has been developing extensively under high consumption and high pollution. However, with the fragility of the ecological system in which human beings live, the deterioration of the environment, and the high shortage of resources, both the stock of resources and the carrying capacity of the environment have been overwhelmed. Printing and post-press processing have pollution problems to the environment. For example, the developer used in pre-press platemaking contains toxic chemical components, and the ordinary ink used in printing, car wash water, etc. contain heavy metal elements such as lead, chromium, and mercury, which have caused certain harm to human health. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D405/12G03F7/004C09D7/63C09J11/06
CPCC07D405/12G03F7/004C09D7/63C09J11/06
Inventor 宋小伟齐海潮张伟张攀杨帅刘晓蕾
Owner LUCKY HUAGUANG GRAPHICS
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