Self-crosslinked fluorosilicate acrylic resin and preparation method thereof

Abstract

The invention discloses self-crosslinked fluorosilicate acrylic resin and a preparation method thereof. The self-crosslinked fluorosilicate modified acrylic resin has the structural formula shown in the specifications, wherein n=4, 6 and 8, and the molecular weight is 60,000-80,000; X refers to a (meth)acryloxy functional group or an alkenyl-containing silane coupling agent; and X has the structural formula shown in the specifications, wherein R is -CH3 or -CH2CH3. The preparation method comprises the following steps of: adding a solvent into a reaction container, and heating to the temperature of between 90 and 100DEG C; uniformly mixing methyl methacrylate, acrylic acid, ethyl acrylate, hydroxyethyl acrylate, a silane coupling agent, perfluoroalkylethyl acrylate and tert-butyl hydroperoxide, and dripping for 2 to 3 hours; keeping the temperature for 3 to 4 hours; and reducing the temperature to 40-60DEG C and discharging. The prepared resin has high weatherability, high chemical resistance, high-temperature resistance, good mechanical properties and glossiness, and high insulativity; and the preparation method has simple process steps and is easy to implement.

Description

technical field [0001] The invention relates to a self-crosslinking fluorosilicon modified acrylic resin and a preparation method thereof. Background technique [0002] The rapid development of acrylic resin is due to its excellent comprehensive properties, such as durability, transparency, stability, gloss retention, and color retention, and also because it can be adjusted to obtain different hardness, flexibility, and compliance with requirements. However, its disadvantage is that its mechanical properties are poor. There are currently two types of improvement methods: one is to introduce a certain amount of fluorine-containing olefin in the synthesis process of acrylic resin to obtain a fluorine-containing resin. Due to the high electronegativity of the F atom, fluorine Carbon resin has excellent weather resistance, chemical resistance, and stain resistance; the other is to introduce a certain amount of silicone functional groups into acrylic resin to make acrylic silicon...

AI Technical Summary

Problems solved by technology

[0002] The rapid development of acrylic resin is due to its excellent comprehensive properties, such as durability, transparency, stability, gloss retention, and color retention, and also because it can be adjusted to obtain different hardness, flexibility, and compliance with requirements. However, its disadvantage is that its mechanical properties are poor. There are currently two types of improvement methods: one is to introduce a certain amount of fluorine-containing olefin in the synthesis process of acrylic resin to obtain a fluorine-containing resin. Due to the high electronegativity of the F atom, fluorine Carbon resin has excellent weather resistance, chemical resistance, and stain resistance; the other is to introduce a certain amount of silicone functional groups into acrylic resin to make acrylic silicone oligomer resin, so that the resin side chain or terminal Si-O bonds with higher dissociation energy improve the properties of the resin such as high temperature resistance, cold resistance, moisture resistance, weather resistance, stain resistance, chemical corrosion resistance, and electrical insulation

Although these two modification methods have outstanding advantages, they also have shortcomings in some aspects, such as the heat resistance of the former is not ideal; the film-forming performance of the latter is poor, the curing temperature is high, and the adhesion to the substrate is poor.

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