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Polymer fluororubber as well as preparation method and application thereof

A fluororubber and reaction kettle technology, applied in the direction of coating, can solve the problems of difficult to meet the requirements of coating viscosity, low viscosity, etc., and achieve the effects of increasing molecular weight, good sag resistance, and high fluorine content

Active Publication Date: 2014-04-02
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing fluorine-containing rubber with a fluorine content greater than 40% generally has a weight-average molecular weight of 30,000 to 300,000 and an intrinsic viscosity of 0.7 to 2.5.
The molecular weight of the high-strength ternary fluorine rubber as described in CN101186667A is about 300,000, and its viscosity is too low, so it is difficult to reach the requirement that the coating thickener improves the viscosity of the coating

Method used

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  • Polymer fluororubber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 30L deionized water to a 50L horizontal reactor, evacuate until the oxygen content is less than 50ppm, add a mixed monomer of chlorotrifluoroethylene and vinylidene fluoride with a molar ratio of 1:1 until the pressure of the reactor is 2.5Mpa, and raise the temperature at the same time To 40°C, add 3g of potassium permanganate, 1g of potassium bromide, 15g of sodium hydroxide, and 50g of sodium perfluoropolyether carboxylate to start the reaction. During this period, add the mixed monomer in the above ratio to maintain the pressure of the reactor at 3.5Mpa. When the mixed monomer is fed to 10kg, add 1kg of perfluoromethyl vinyl ether, and continue to react until the mixed monomer is fed to 13kg, then stop. Recover the unreacted monomer to the monomer storage tank, evacuate, release the emulsion, add a small amount of MgCl 2 The target product was condensed, washed with deionized water, dried and sent for inspection. The results are shown in Table 1.

Embodiment 2

[0028] 50L horizontal reactor, add 30L deionized water, evacuate until the oxygen content is less than 50ppm, add the mixed monomer of perfluoropropylene and vinylidene fluoride with a molar ratio of 2:8 until the pressure of the reactor is 3.5Mpa, and at the same time Raise the temperature to 40°C, add 3g of potassium permanganate, 1g of potassium bromide, 15g of sodium hydroxide, and 50g of sodium perfluoropolyether carboxylate to start the reaction. During this period, add the mixed monomer in the above ratio to maintain the pressure of the reactor at 5.0Mpa. When the feed reaches 10kg, add 1kg of perfluoromethyl vinyl ether, and continue the reaction until the mixed monomer feeds to 13kg, then stop. Recover the unreacted monomer to the monomer storage tank, evacuate, release the emulsion, add a small amount of MgCl 2 The target product was condensed, washed with deionized water, dried and sent for inspection. The results are shown in Table 1.

Embodiment 3

[0034] This example is intended to illustrate the effect of the fluororubber of the present invention on improving the performance of coatings, but is not limited to the coatings described in Example 3.

[0035] This embodiment provides a coating containing fluorine rubber.

[0036] The fluororubber that embodiment 1 and 2, comparative example 1 obtains is dissolved in ethyl acetate, obtains the solution A, B, C that is swelling critical state of 30wt%, in 200g certain solvent type epoxy resin paint, Add 30g of the above-mentioned solutions A, B, and C, and disperse evenly to obtain coatings 1, 2, and 3; add 2.5g of fumed silica to 200g of the above-mentioned similar epoxy resin to obtain coating 4.

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PUM

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Abstract

The invention relates to a preparation method of fluororubber. The preparation method comprises the following steps: copolymerizing two or more main polymer monomers under high-pressure and low-temperature conditions by the combined effects of a redox initiation system and an emulsifier, introducing modified monomers, and polymerizing to obtain the fluororubber. According to the preparation method, polymerization reaction conditions are controlled and aids such as the redox initiation system and the emulsifier are optimized, so that the molecular weight of the fluororubber is effectively increased and the weight-average molecular weight reaches more than 800,000; the obtained fluororubber has the fluorine content more than 40% and the intrinsic viscosity more than 5.0; a dissolved high-viscosity solution has the characteristics of high fluorine content, ageing resistance, weather resistance and corrosion resistance, and can be used as a thickening agent with good settling resistance and sag resistance in paint.

Description

technical field [0001] The invention relates to a polymer fluorine-containing rubber, a preparation method and application thereof. It belongs to the field of polymer preparation. Background technique [0002] Generally speaking, the amount of additives used in coatings is very small (usually less than 5%), but they can often be used to solve many problems in production, and play a key role in improving and improving the performance of coatings and coating films. An essential ingredient in the production and construction of coatings. Asia is the region with the largest consumption of coating and ink additives, and China is showing a double-digit growth trend. [0003] Thickeners commonly used in solvent-based coatings include inorganic thickeners and organic thickeners; inorganic thickeners include organic expansive clay, fumed silica, hydrogenated castor oil, polyamide wax, etc. However, its compatibility with solvent-based coatings, dispersion, and sedimentation have alw...

Claims

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Application Information

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IPC IPC(8): C08F214/24C08F214/22C08F216/14C08F214/28C08F4/40C08F2/26C08F2/38C09D127/16C09D127/20
Inventor 张海波
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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