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Coatings and coatings based on bridging dianhydride and poss hybrid epoxy resin

A technology of epoxy resin and dianhydride, which is applied in the direction of epoxy resin coating, coating, fireproof coating, etc., can solve the problems of poor mutual solubility and high melting point, and achieve the effect of convenient use

Active Publication Date: 2022-04-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of existing small molecule acid anhydrides such as high melting point, mostly solid, and poor miscibility with epoxy resin at room temperature, and to improve the flexibility and other properties of epoxy resin coating, the present invention discloses a latent bridging based The preparation method of the coating and the coating constructed by dianhydride (CBA) curing agent and epoxy resin POSS hybridization etc.

Method used

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  • Coatings and coatings based on bridging dianhydride and poss hybrid epoxy resin
  • Coatings and coatings based on bridging dianhydride and poss hybrid epoxy resin
  • Coatings and coatings based on bridging dianhydride and poss hybrid epoxy resin

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preparation example Construction

[0026] Preparation of Latent Bridged Dicarboxylic Anhydride CBA Curing Agent

[0027] In a three-necked flask equipped with a thermometer, a reflux condenser, and an agitator, add 0.2-0.22mol pyromellitic anhydride (PMDA) and the DMF solvent of 100% (about 43.62-47.99g) in PMDA mass fractions successively , heated to 100°C until PMDA dissolves into a transparent state, stirred, and then added dropwise about 0.1mol hydroxyl-terminated polyether diol (PEDO) within 30 minutes, controlling the PMDA:PEDO molar ratio to about 2-2.2:1, and then Continuous stirring reaction 4-10h again, reaction finishes, obtains light yellow transparent liquid, promptly structure is as shown in formula (I), R is the bridging diacid anhydride (CBA) solidifying agent of polyether group, the synthesis of CBA in each embodiment See Table 1 for the relevant performance indicators of raw materials, dosages and targets.

[0028] Table 1 prepares the raw material of latent CBA solidifying agent and consumpt...

Embodiment 1

[0032] In parts by mass, weigh 100.0g of epoxy resin E-51 with an epoxy equivalent of about 0.51 and a viscosity of about 11000mPa.s, and 3.0g of epoxy resin E-51 whose structure is shown in formula (1a) Propoxypropyl) POSS, 10.0g butyl glycidyl ether, 1.0g BYK-ATU dispersant, 25.0g nano TiO 2 , after stirring and mixing, stir and disperse for 40min with a dispersing disc with a rotating speed of 1000r / min, and then press the epoxy group contained in the system: the molar ratio of (anhydride group+carboxyl group) contained in the latent CBA curing agent is 1:1 , then weighed 160.95g of tripropylene glycol bridged dianhydride (CBA-1) curing agent with a solid content of about 59.03%, an anhydride group content of about 0.3182%, and a carboxyl content of about 0.3182%, and stirred and mixed evenly. The resulting mixture is the coating prepared based on CBA-1 and POSS hybrid epoxy resin, etc., which is denoted as ECBA-1, diluted with BA to a solid content of about 60%, and set as...

Embodiment 2

[0035] By mass parts, take successively 166.67g epoxy equivalent to be about 0.20, solid content be 60% epoxy resin E-20 solution (containing solid resin 100.0g, Baotashan Paint Co., Ltd.), 5.0g structure such as formula ( 1a) cage-type octa(3,4-epoxycyclohexylethyl)POSS and 20.0g structure shown in formula (2a) cage-type mono(2,3-epoxypropoxypropyl)heptaisobutyl POSS, 20.0g C 12-14 Alkyl glycidyl ether AGE, 2.0g BYK-ATU dispersant, 50.0g nano CaCO 3 , stir and disperse for 60min with a dispersing disc with a rotating speed of 1000r / min, and then press the molar number of epoxy groups contained in the system: the molar number of (anhydride group+carboxyl) contained in the curing agent CBA is about 1:0.8. Weigh 69.11g of polyethylene glycol bridged dianhydride (CBA-2) curing agent with a solid content of about 65.20%, an anhydride group content of about 0.2564%, and a carboxyl content of about 0.2331%, stir and mix, and the resulting mixture is The coating prepared based on C...

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Abstract

The invention discloses a coating and a coating preparation method based on a bridging dianhydride curing agent and a POSS hybrid epoxy resin. The coating of the present invention consists of 100 parts of epoxy resin, 3-25 parts of epoxy-based POSS, 10-20 parts of active epoxy diluent ED, 0.5-2 parts of dispersant, 25-50 parts of nano pigment fillers and latent bridging Composed of dianhydride CBA curing agent; and the amount of latent bridging dianhydride CBA curing agent is controlled as the number of moles of epoxy groups contained in the system: contained in the bridging dianhydride curing agent (anhydride group+carboxyl) The number of moles is 1:1‑0.8. The present invention not only converts the solid acid anhydride that is difficult to dissolve in epoxy resin at room temperature into a liquid bridging dianhydride that is easy to use by reaction, and the acid anhydride is used in the epoxy resin coating system of the above-mentioned epoxy group POSS hybridization, and can also Realize thermal curing of epoxy resin coatings, and obtain coatings with good hardness, flexibility, heat resistance and flame retardancy.

Description

technical field [0001] The invention belongs to the field of coatings and coatings, in particular to an epoxy resin based on latent bridging diacid anhydride (CBA) curing agent and cage epoxy oligomeric silsesquioxane (E-POSS) hybridization, etc. Prepared coatings and methods of coating. Background technique [0002] Epoxy resin has good adhesion, strong adhesion, excellent chemical corrosion resistance and good electrical insulation. It is widely used in chemical anticorrosion and bonding, cable moisture resistance and circuit board packaging, electronic and electrical components potting and insulation, etc. application, and occupy a pivotal position. Modification of epoxy resin with POSS (inorganic framework composed of silicon-oxygen bonds in the core and organic groups in the top corners) can not only improve the hardness of the coating, but also endow the coating with properties such as low dielectric, heat resistance, and flame retardancy. Therefore, it has been a re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D163/02C09D5/18C09D7/61C09D7/65C08G59/42B05D3/02B05D7/24
CPCC09D163/00C09D5/18C09D7/61C09D7/65C08G59/4223C08G59/4269B05D7/24B05D3/0254C08K2201/011C08K2003/2241C08K2003/265C08K2003/2296C08K2003/2227C08L2201/02C08L2201/08C08L83/06C08K3/22C08K3/26C08K3/36
Inventor 安秋凤金晶杨博文史书源黄良仙薛朝华
Owner SHAANXI UNIV OF SCI & TECH
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