Method for preventing vinyl monomer from being polymerized in storage tank

A vinyl monomer and storage tank technology is used in the field of preventing the polymerization of monomers in storage tanks, which can solve the problems of low addition amount of polymerization inhibitor, and achieve the effects of improving adhesion, simple and easy process, and uniform distribution.

Active Publication Date: 2014-01-15
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts the method of layered brushing to paint the polymerization inhibitor coating on the inner wall of the storage tank. The polymerization inhibitor can be released from the solidified coating to prevent the polymerization of the monomer condensate on the top of the tank. This patent does not involve The way of adding the polymerization inhibitor, and the addition of the polymerization inhibitor is relatively low

Method used

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  • Method for preventing vinyl monomer from being polymerized in storage tank
  • Method for preventing vinyl monomer from being polymerized in storage tank
  • Method for preventing vinyl monomer from being polymerized in storage tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Apply epoxy resin paint on a standard tinplate plate (50×100×0.2~0.3mm), the amount of polymerization inhibitor p-tert-butyl catechol accounted for 3% of the base material (mass fraction, the same below), first put the Dissolve tert-butyl catechol with ethylbenzene, then add the ethylbenzene solution of p-tert-butyl catechol to the epoxy paint base and stir evenly, then add curing agent thick paste amine adduct to cure for 0.5 hours, and then paint . A three-layer overcoating method is adopted, in which the thickness of the bottom layer is about 30 μm, the middle layer is about 80 μm, and the surface layer is about 110 μm. After the coating was dry, the adhesion was tested, and then the coated panel was placed in a 5L styrene storage tank and soaked at 30°C for 3 months. The results are shown in Table 1.

[0027] Table 1: Variation of coating adhesion with different brushing methods

[0028]

[0029] It can be seen from Table 1 that the compatibility between the po...

Embodiment 2～10

[0031] On the tinplate plate described in Example 1, different coatings and polymerization inhibitor addition methods and three-layer overcoating methods were used to paint, wherein the polymerization inhibitor p-tert-butylcatechol in Examples 2 to 4 Add-on accounts for 10% of base material, and in embodiment 5~7, the add-on of polymerization inhibitor p-tert-butylcatechol accounts for 15% of base material, and in embodiment 8~10, add-on of inhibitor p-tert-butylcatechol 25% of base material. The changes in coating adhesion are shown in Table 2.

[0032] Table 2: Changes in adhesion of different coatings

[0033]

[0034] It can be seen from Table 2 that no matter what kind of coating, which solvent is used, the appropriate addition method of polymerization inhibitor should be added to the base material. After the above-mentioned coated boards were soaked in styrene for a period of time, the coatings of Examples 4, 7, and 10 were intact without peeling; the coatings of Ex...

Embodiment 11～13

[0036] Brush epoxy resin paint on the inner wall of the 5L styrene storage tank tank roof, wherein the polymerization inhibitor is selected from the compound of p-tert-butylcatechol and 2-sec-butyl-4,6-dinitrophenol, two The mass ratio of the former is 2:3, and the amount added accounts for 20% of the base material. First, dissolve the polymerization inhibitor with styrene, and then add the styrene solution in which the polymerization inhibitor is dissolved to the epoxy paint base material and stir evenly. After mixing evenly with the auxiliary material curing agent, use the method of three-layer overcoating, and paint according to different surface thicknesses. The thickness of the bottom layer is 40 μm, and the thickness of the middle layer is 60 μm. Under the storage temperature of 40°C, the styrene condensate was collected regularly, and the content of polymerization inhibitor was analyzed. The results are shown in Table 3.

[0037] Table 3: Changes in the content of poly...

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Abstract

The invention relates to a method for preventing a monomer from being polymerized in a storage tank, and particularly relates to a method for preventing a vinyl monomer from being polymerized in the storage tank. The method comprises the following step of brushing a coating on the inner wall of the vinyl monomer storage tank, wherein the coating comprises a bottom layer, an intermediate layer and a surface layer, the bottom layer and the surface layer are coatings which contain no polymerization inhibitor, the intermediate layer is a coating which contains the polymerization inhibitor, and the intermediate layer is prepared according to the following steps of (1) adding the polymerization inhibitor to a solvent for dissolution; (2) adding a solution obtained from the step (1) to the base material of a coating material, and stirring for mixing; (3) adding an auxiliary material solidifying agent to the base material which contains the polymerization inhibitor, stirring for mixing, and then brushing. The method disclosed by the invention solves the problem that the coating is reduced in adhesive force and short in polymerization inhibition period after the polymerization inhibitor is added in the prior art by changing the addition method of the polymerization inhibitor, effectively prevents the vinyl monomer from being polymerized in the storage tank and prolongs the tank cleaning period of the storage tank.

Description

technical field [0001] The invention relates to a method for preventing polymerization of monomers in storage tanks, in particular to a method for preventing polymerization of vinyl monomers in storage tanks. Background technique [0002] Vinyl monomers are chemically active. For example, styrene is an important polymerizable monomer. It can be polymerized by itself or with other monomers. It is widely used in the fields of synthetic polymer materials, coatings, and medicine. Styrene undergoes slow thermally activated polymerization at ambient temperature. Therefore, when the vinyl monomer is transported or stored, a polymerization inhibitor must be added to ensure product quality. [0003] Commonly used storage inhibitors are tert-butylcatechol (TBC), 2,5-di-t-pentylhydroquinone, benzoquinone, hydroquinone, p-hydroxyanisole, etc., which are crystalline at room temperature substance. During storage, at a certain temperature, part of the vinyl monomer in the storage tank w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/20C07C15/46C07C15/44C07C11/08C07C11/09C07C17/42C07C25/28C09D163/00C09D1/00C09D7/12
Inventor 菅秀君王申军潘清
Owner CHINA PETROLEUM & CHEM CORP
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