Waterborne polyurethane thickener and application in alcohol-free fountain solution

A water-based polyurethane and water-based polyester technology, which is applied in the preparation and printing of printing surfaces, can solve the problems of insufficient water film thickness, poor water retention, and environmental pollution by alcohol and isopropanol, achieving good water retention, not easy to mold, The effect of meeting performance requirements

Active Publication Date: 2017-11-17
瑞安市隆联新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The invention provides a water-based polyurethane thickener and its application in alcohol-free fountain solution to solve the existing problems of insufficient water film thickness, poor water retention, and environmental pollution by using alcohol and isopropanol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] is obtained by the following steps:

[0032] (1) Preparation of sulfonic acid type water-based polyester polyol:

[0033] (1) Using a transesterification reactor: 30 parts by weight of 2-methyl-1,3-propanediol (MPO), 60 parts by weight of dimethyl isophthalate-5-sodium sulfonate (SIPM), 60 parts by weight of iso-titanate Add 0.5 parts by weight of octyl ester to the transesterification kettle, heat to 80°C, start stirring, and at the same time start injecting nitrogen, rapidly raise the temperature to 200°C, keep the temperature for 5 hours until the theoretical amount of methanol is exhausted, and set aside;

[0034] (2) Using an esterification reactor: add 50 parts by weight of adipic acid (AA) and 40 parts by weight of 1,4-butanediol (1,4-BDO) into the esterification reactor, and heat up to 80 ℃, start stirring, and continue to heat up to 150°C, keep the temperature for 2 hours, when no water flows out, continue to heat up to 180°C for 2 hours, check the acid value ...

Embodiment 2

[0043] is obtained by the following steps:

[0044] (1) Preparation of sulfonic acid type water-based polyester polyol:

[0045] (1) Using a transesterification reactor: 35 parts by weight of 2-methyl-1,3-propanediol (MPO), 65 parts by weight of dimethyl isophthalate-5-sodium sulfonate (SIPM), and iso-titanate Add 0.6 parts by weight of octyl ester to the transesterification kettle, heat to 80°C, start stirring, and start injecting nitrogen at the same time, quickly raise the temperature to 205°C, keep the temperature for 6 hours until the theoretical amount of methanol is exhausted, and set aside;

[0046] (2) Using an esterification reactor: 55 parts by weight of adipic acid (AA) and 45 parts by weight of 1,4-butanediol (1,4-BDO) were added to the esterification reactor, and the temperature was raised to 80 ℃, start stirring, and continue to heat up to 155°C, keep the temperature for 2 hours, when no water flows out, continue to heat up to 185°C for 2 hours, check the acid ...

Embodiment 3

[0055] is obtained by the following steps:

[0056] (1) Preparation of sulfonic acid type water-based polyester polyol:

[0057] (1) Using a transesterification reactor: 40 parts by weight of 2-methyl-1,3-propanediol (MPO), 70 parts by weight of dimethyl isophthalate-5-sodium sulfonate (SIPM), 70 parts by weight of iso-titanate Add 0.7 parts by weight of octyl ester to the transesterification kettle, heat to 80°C, start stirring, and start injecting nitrogen at the same time, quickly raise the temperature to 210°C, keep the temperature for 7 hours until the theoretical amount of methanol is exhausted, and set aside;

[0058] (2) Using an esterification reactor: add 60 parts by weight of adipic acid (AA) and 50 parts by weight of 1,4-butanediol (1,4-BDO) into the esterification reactor, and heat up to 80 ℃, start stirring, and continue to heat up to 160°C, after 2 hours of constant temperature, when no water flows out, continue to heat up to 190°C and constant temperature for ...

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PUM

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Abstract

The invention relates to a waterborne polyurethane thickener and an application in alcohol-free fountain solution and belongs to the waterborne polyurethane thickener. The waterborne polyurethane thickener is prepared by the following steps: firstly enabling waterborne polyester polyol and isocyanate to react to produce prepolymers, wherein the reaction of the waterborne polyester polyol is full due to far-excessive isocyanate in a prepolymer system at the moment; then carrying out chain expansion by utilizing a small-molecular chain expanding agent, calculating the feeding amount of the chain expanding agent before feeding, adding an end capping agent to carry out end capping when the amount of the isocyanate (NCO%) is reduced to a specified index so as to cause the oleophylic and hydrophilic ratio on the molecular chain to meet the requirements of a dispersing agent. The waterborne polyurethane thickener and the application have the advantages that three separated kettles are adopted for continuous production, so that the side reaction in the reaction process is reduced and the quality of the waterborne polyester polyol is guaranteed; the water-film thickness of the fountain solution is increased; the fountain solution is good in water-retaining property and is not easy to get mildew; and no alcohol or isopropanol is used in the fountain solution, so that the pollution is reduced, the safety is guaranteed, and simultaneously the requirements of offset print for the property of the fountain solution are met.

Description

technical field [0001] The invention relates to a water-based polyurethane thickener and its application in alcohol-free fountain solution. Background technique [0002] There are currently four common thickeners: [0003] (1) Inorganic thickeners, such as bentonite, are relatively cheap and have strong corrosion resistance. The disadvantages are poor leveling and poor compatibility; [0004] (2) Cellulose, such as carboxymethyl cellulose, this kind of thickener is easily degraded by bacterial corrosion and has poor corrosion resistance; [0005] (3) Polyacrylates, such thickeners are easily affected by pH and electrolytes, have poor thixotropy and poor hydrolysis resistance; [0006] (4) Water-based polyurethane, an environmentally friendly thickener with a special thickening mechanism, also known as the third-generation thickener. This type of thickener is generally polyethylene glycol as the soft segment, ethylene glycol as the chain extender, and hexaethylene diisocya...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G18/10C08G63/688C08G63/85B41N3/08
CPCB41N3/08C08G18/10C08G18/4211C08G18/6674C08G63/6886C08G63/85C08G18/3206
Inventor 任宝东任佳晁国库张权
Owner 瑞安市隆联新材料有限公司
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