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A kind of preparation method of corrosion-resistant polyurethane press roll

A press roll, polyurethane technology, applied in the press part, other household utensils, papermaking, etc., can solve the problems of destroying the strength and surface finish of the press roll, affecting the dehydration efficiency of the press roll, corrosion, etc., to achieve good strength and solvent resistance, Enhanced strength and simple process steps

Active Publication Date: 2019-09-27
东莞理文造纸厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing polyurethane has good strength, however, the polyurethane currently used for press rolls is mainly made of raw materials containing isocyanate, which is easy to react with compounds of active hydrogen atoms, such as amines, water, alcohols, acids, and alkalis. The paper is made of chemical agents such as bleaching agent, hardener, toughening agent, regulator, sodium ethylene sulfonate and fiber pulp. These chemical agents are corrosive to a certain extent. When rolling paper, its polyurethane will be corroded by chemical agents, which will destroy the strength of the press roll and the smoothness of its surface, so as to affect the dehydration efficiency of the press roll

Method used

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  • A kind of preparation method of corrosion-resistant polyurethane press roll
  • A kind of preparation method of corrosion-resistant polyurethane press roll

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a corrosion-resistant polyurethane press roll in this embodiment comprises the following steps:

[0029] Step 1: Prepare Modified Polyurethane Resin

[0030] (1) Weigh the following raw materials in percentage by weight: 15% diisocyanate, 15% polypropylene carbonate diol, 20% tetrafluoroethylene, 19.84% phenolic resin, 30% ethyl acetate, 0.04% azo initiator , Inorganic peroxygen initiator 0.02%, crosslinking agent 0.1%.

[0031] (2) Vacuum dehydrate the polypropylene carbonate diol of formula quantity at 80 DEG C for 30 minutes, after dehydration, cool it down to normal temperature, then add the azo initiator of formula quantity, heat up to 70 DEG C while stirring, then Add the formulated amount of diisocyanate, and continue to stir and react at 70°C for 4 hours to obtain the first mixture; wherein, the azo initiator is a mixture of azobisisobutyronitrile and azobisisoheptanonitrile.

[0032] (3) Mix the tetrafluoroethylene with the formula quan...

Embodiment 2

[0041] A method for preparing a corrosion-resistant polyurethane press roll in this embodiment comprises the following steps:

[0042] Step 1: Prepare Modified Polyurethane Resin

[0043] (1) Weigh the following raw materials in percentage by weight: 30% diisocyanate, 15% polypropylene carbonate diol, 10% tetrafluoroethylene, 10% phenolic resin, 34.36% ethyl acetate, 0.08% azo initiator , Inorganic peroxygen initiator 0.06%, crosslinking agent 0.5%;

[0044] (2) Vacuum dehydrate the polypropylene carbonate diol of formula quantity at 120 DEG C for 40 minutes, after dehydration, cool it down to normal temperature, then add the azo initiator of formula quantity, heat up to 80 DEG C while stirring, then Adding a formulated amount of diisocyanate, continuing to stir and react at 80°C for 5 hours to obtain the first mixture; wherein, the azo initiator is one of azobisisoheptanonitrile and dimethyl azobisisobutyrate or a mixture of two or more.

[0045] (3) Mix the tetrafluoroeth...

Embodiment 3

[0054] A method for preparing a corrosion-resistant polyurethane press roll in this embodiment comprises the following steps:

[0055] Step 1: Prepare Modified Polyurethane Resin

[0056] (1) Weigh the following raw materials in percentage by weight: 17% of diisocyanate, 17% of polypropylene carbonate diol, 15% of tetrafluoroethylene, 15% of phenolic resin, 35.71% of ethyl acetate, 0.06% of azo initiator , Inorganic peroxygen initiator 0.03%, crosslinking agent 0.2%.

[0057] (2) Vacuum dehydrate the polypropylene carbonate diol of formula quantity at 100 DEG C for 35 minutes, cool it to normal temperature after dehydration, then add the azo initiator of formula quantity, heat up to 75 DEG C while stirring, then Add the formulated amount of diisocyanate, and continue to stir and react at 75° C. for 4.5 hours to obtain the first mixture; wherein, the azo initiator is azobisisobutyric acid.

[0058] (3) Mix the tetrafluoroethylene with the formulated amount of the inorganic pe...

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Abstract

The invention relates to the technical field of press rolls, and particularly relates to a preparation method of a corrosion-resistant polyurethane press roll. The preparation method comprises the following steps: preparing modified polyurethane resin by using raw materials of formula ratios, and then carrying out laminating coating on the modified polyurethane resin with a steel material, so as to obtain the chemical agent corrosion-resistant press roll. The preparation method has a simple process and is suitable for large-scale production and application.

Description

technical field [0001] The invention relates to the technical field of press rolls, in particular to a method for preparing a corrosion-resistant polyurethane press roll. Background technique [0002] In industrial papermaking, it is necessary to use press rolls to remove moisture from the paper, and the paper that has been pressed by the press rolls has a higher bulk, so that paper with higher stiffness can be obtained. Because polyurethane has high strength, high elasticity, mechanical strength, wear resistance, and high surface finish, and its adhesion to metal roll cores is also higher than that of ordinary rubber, therefore, the existing paper machine press rolls have been widely used. layer so that the press roll can run better at a certain line speed and high pressure. Although the existing polyurethane has good strength, however, the polyurethane currently used for press rolls is mainly made of raw materials containing isocyanate, which is easy to react with compoun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F3/08B29D99/00C08F283/00C08F214/26C08G18/44C08G18/54
Inventor 李文斌
Owner 东莞理文造纸厂有限公司
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