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Polyethylene glycol modified melamine resin and preparation method thereof

A technology of polyethylene glycol modification and melamine resin, which is applied in the field of polymer materials, can solve the problems of water absorption and heat resistance, and achieve the effects of improving water solubility, improving comprehensive performance, and improving brittle defects

Active Publication Date: 2022-03-22
江门建滔电子发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the modification of melamine resin with polyethylene glycol can improve the brittleness and reduce the content of free formaldehyde to a certain extent, but because the long-chain polyethylene glycol has strong hydrophilicity and molecular flexibility, it will affect the water absorption of the product. rate and thermal resistance are adversely affected

Method used

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  • Polyethylene glycol modified melamine resin and preparation method thereof
  • Polyethylene glycol modified melamine resin and preparation method thereof
  • Polyethylene glycol modified melamine resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of preparation method of polyethylene glycol modified melamine resin of the present embodiment, comprises following preparation steps:

[0044] (1) According to the material names and feed amounts (parts by weight) shown in Table 1, add materials 1 to 6 into the reactor and stir and mix evenly, then stir and heat up to about 90°C within 30 minutes and keep the temperature for 1.5 hours. Infrared spectrum Monitor the disappearance of the hydroxyl absorption peak to obtain a prepolymer.

[0045] (2) Add material 7 to the prepolymer in step (1) to adjust the pH to 7.5, then cool down to 60°C, add materials 8-11, heat up to about 95°C for 1 hour and complete the reaction.

[0046] (3) Add materials 12-13 into the reactor and stir to obtain polyethylene glycol-modified melamine resin.

[0047] Table 1. Material code and proportion

[0048]

[0049] In this example, the average molecular weight of polyether-terminated polysiloxane is 800, which is prepared by the ...

Embodiment 2

[0052] A kind of preparation method of polyethylene glycol modified melamine resin of the present embodiment, comprises following preparation steps:

[0053] (1) According to the material names and feed amounts (parts by weight) shown in Table 2, add materials 1 to 6 into the reactor, stir and mix evenly, then stir and heat up to about 90°C within 30 minutes and keep the temperature for 2 hours. Monitor by infrared spectrum The hydroxyl absorption peak disappeared, and a prepolymer was obtained.

[0054] (2) Add material 7 to the prepolymer in step (1) to adjust the pH to 7.5, then cool down to 70°C, add materials 8-11, heat up to about 95°C for 1 hour and complete the reaction.

[0055] (3) Add materials 12-13 into the reactor and stir to obtain polyethylene glycol-modified melamine resin.

[0056] Table 2. Material code and proportion

[0057]

[0058] In this example, the average molecular weight of polyether-terminated polysiloxane is 1200, which is prepared by the foll...

Embodiment 3

[0061] A kind of preparation method of polyethylene glycol modified melamine resin of the present embodiment, comprises following preparation steps:

[0062] (1) According to the material names and feed amounts (parts by weight) shown in Table 3, add materials 1 to 6 into the reactor, stir and mix evenly, then stir and heat up to about 90°C within 30 minutes and keep the temperature for 3 hours. Monitor by infrared spectrum The hydroxyl absorption peak disappeared, and a prepolymer was obtained.

[0063] (2) Add material 7 to the prepolymer in step (1) to adjust the pH to 7.5, then cool down to 65°C, add materials 8-11, heat up to about 95°C for 2 hours and complete the reaction.

[0064] (3) Add materials 12-13 into the reactor and stir to obtain polyethylene glycol-modified melamine resin.

[0065] Table 3. Material code and proportion

[0066]

[0067] In this example, the average molecular weight of polyether-terminated polysiloxane is 1600, which is prepared by the f...

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Abstract

The invention belongs to the technical field of polymer materials, and discloses polyethylene glycol modified melamine resin and a preparation method thereof. The preparation method comprises the following steps: adding polyethylene glycol, polyether-terminated polysiloxane, hydroquinone, melamine, water and an acidic catalyst into a reactor, uniformly stirring and mixing, then heating to 85-95 DEG C, and carrying out heat preservation reaction to obtain a prepolymer; adding a pH regulator to regulate the pH value to 7-9, cooling to 80 DEG C or below, adding hydroquinone, melamine, formaldehyde and a basic catalyst, heating to 90-100 DEG C, and carrying out heat preservation reaction; and after the reaction is completed, adding water and methanol for dilution to obtain the polyethylene glycol modified melamine resin. According to the preparation method disclosed by the invention, the molecular flexibility is improved and the moisture absorption rate is reduced by introducing long-chain polyethylene glycol and polysiloxane structures, the heat resistance of a system is improved by introducing a benzene ring structure, and the finally obtained melamine resin simultaneously has the comprehensive properties of high strength, high heat resistance and low moisture absorption rate.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyethylene glycol-modified melamine resin and a preparation method thereof. Background technique [0002] Melamine resin, also known as melamine formaldehyde resin or melamine formaldehyde resin, is a polymer obtained by the reaction of melamine and formaldehyde. Often used as adhesives, laminated materials, coatings, resins for molding compounds, and as treatment agents for fabrics, paper, leather, etc. [0003] The traditional preparation method of melamine resin is that under certain temperature and pH value conditions, melamine and solid paraformaldehyde undergo methylolation reaction under the condition of water as a solvent to generate polyhydroxy melamine. Most of the resins at this stage are oligomers. The viscosity is also smaller. Then carry out acid polycondensation reaction: polyhydroxy melamine slowly undergoes a three-dimensional network ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/40
CPCC08G12/40
Inventor 周培峰
Owner 江门建滔电子发展有限公司
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