Corrosion-resistant phenolic epoxy coating under insulation

A novolac epoxy and novolac epoxy resin technology, applied in epoxy resin coatings, anticorrosive coatings, polyamide coatings, etc. Long-term corrosion resistance, improved cracking resistance, easy preparation

Active Publication Date: 2017-08-25
SHANGHAI HILONG SHINE NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively high working temperature of thermal pipelines, the effect of ordinary coatings under the insulation layer is limited. This is due to: (1) ordinary coatings are not resistant to high temperatures, and they are prone to blistering and carbonization on the coating surface at high temperatures, resulting in excessive coatings. Early failure; (2) Some high-temperature-resistant coatings are relatively thin due to the construction coating, although they can withstand high temperatures, but the anti-corrosion effect is not ideal, and they are prone to corrosion after short-term use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) A corrosion-resistant phenolic epoxy coating under the insulation layer, comprising A component and B component, and the weight percentage of each raw material in the A component is:

[0029] Novolac epoxy resin 20%, should use novolac epoxy resin with epoxy equivalent of 176-181. The novolak epoxy resin of DEN 438 produced by Dow Company can be used in the implementation.

[0030] The solvent is 19%, which is xylene, and xylene with a specific gravity between 0.8 and 0.9 should be used. In the implementation, industrial-grade xylene produced by Guangdong Maoming Petrochemical Company can be used.

[0031] Thixotropic agent 0.6%, adopt ST type thixotropic agent produced by Hemings Company.

[0032] Defoamer 0.4%, using the BYK066N defoamer produced by BYK.

[0033] Flake iron oxide red 20%, adopt the flake iron oxide red produced by Spanish PROMINDSA company, the model is MICRONOX R02, and the specific gravity is between 3.5 and 4.3.

[0034] Hollow glass micros...

Embodiment 2

[0062] (1) A corrosion-resistant phenolic epoxy coating under the insulation layer, comprising A component and B component, and the weight percentage of each raw material in the A component is:

[0063] Novolak epoxy resin 30% (the raw material that adopts is the same as embodiment 1).

[0064] Solvent 18.4% (the raw material that adopts is with embodiment 1).

[0065] Thixotropic agent 0.5% (the raw material that adopts is the same as embodiment 1).

[0066] Defoamer 0.6% (the raw material that adopts is the same as embodiment 1).

[0067] Flake iron oxide red 15% (the raw materials used are the same as in Example 1).

[0068] Hollow glass microspheres 8% (the raw materials used are the same as in Example 1).

[0069] Barite 27% (the raw material that adopts is the same as embodiment 1).

[0070] Silane coupling agent 0.5% (the raw material that adopts is the same as embodiment 1).

[0071] Component B is 100% modified polyamide resin (the raw materials used are the same a...

Embodiment 3

[0076] (1) A corrosion-resistant phenolic epoxy coating under the insulation layer, comprising A component and B component, and the weight percentage of each raw material in the A component is:

[0077] Novolak epoxy resin 24% (the raw material that adopts is the same as embodiment 1).

[0078] The raw material that solvent 16% adopts is the same as embodiment 1).

[0079] Thixotropic agent 0.5% (the raw material that adopts is the same as embodiment 1).

[0080] Defoamer 0.5% (the raw material that adopts is the same as embodiment 1).

[0081] Flake iron oxide red 22% (the raw materials used are the same as in Example 1).

[0082] Hollow glass microspheres 6% (the raw materials used are the same as in Example 1).

[0083] Barite 30% (the raw material that adopts is the same as embodiment 1).

[0084] Silane coupling agent 1% (the raw materials used are the same as in Example 1).

[0085] Component B is 100% modified polyamide resin (the raw materials used are the same as...

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Abstract

The invention discloses a phenolic aldehyde epoxy coating with CUI (corrosion under insulation) resistance. The phenolic aldehyde epoxy coating comprises a component A and a component B, wherein the component A comprises raw materials in percentage by weight as follows: 20%-30% of phenolic aldehyde epoxy resin, 16%-19% of a solvent, 0.5%-0.6% of a thixotropic agent, 0.4%-0.6% of a defoaming agent, 15%-22% of flaky iron oxide red, 5%-8% of hollow glass microspheres, 27%-34% of barite and 0.5%-1% of a silane coupling agent; the component B is 100% modified polyamide resin; before coating, the component A and the component B are mixed in a weight ratio of A to B being (88-92): (8-12) for use. According to the phenolic aldehyde epoxy coating with CUI resistance, a high-temperature-resistant film can be combined with flaky iron oxide red and the hollow glass microspheres, and an acquired coating layer has good high-temperature resistance, high-temperature cracking resistance and good long-term corrosion resistance, and can effectively resist metal surface corrosion caused by rainwater, mist and electrolyte ion infiltration under insulation; the phenolic aldehyde epoxy coating is easy to prepare and simple, facilitates construction and can be widely applied to the fields of petrochemical industry and thermal pipeline application.

Description

technical field [0001] The invention relates to the technical field of paint research and preparation, and relates to the petrochemical industry and a protective paint for steel structures that has an anti-corrosion effect under the condition of heat preservation, specifically, a corrosion-resistant phenolic epoxy paint under the heat preservation layer. Background technique [0002] The worldwide energy crisis has promoted the research and development of energy-saving technology, and the energy-saving technology has promoted the general application of thermal insulation technology in the petrochemical industry and thermal pipelines. The function of the thermal pipeline insulation layer is to block the loss of heat flow, and most of the insulation materials used are processed by mineral calcination and then bonded. Because minerals contain a large amount of inorganic salts, thermal insulation materials made of minerals still contain a large amount of corrosive substances suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D177/00C09D163/00C09D5/08C09D7/12
CPCC08L2201/08C09D5/08C09D7/61C09D7/70C09D177/00C08L63/00C08K13/04C08K7/28C08K7/00C08K2003/2272C08K2003/3045
Inventor 刘强李明王自龙孙天顺
Owner SHANGHAI HILONG SHINE NEW MATERIAL
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