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High-strength high-toughness unsaturated polyester resin for sheet molding compounds and preparation method of

A technology of sheet molding compound and polyester resin, which is applied in the field of polymer compound preparation, can solve the problems of hysteresis SMC material development and deep application, insufficient water resistance, weather resistance, and affecting the aesthetic effect of products, and achieve excellent thickening ability , Improving the water resistance and excellent yellowing resistance of the resin

Pending Publication Date: 2019-05-31
CHANGZHOU TIANMA GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the application of high-end sanitary products, SMC materials have insufficient water resistance and weather resistance. The main manifestations are that SMC sanitary products have obvious watermark lines and accompanying obvious yellowing phenomenon after years of use, which seriously affects the aesthetic effect of products. Development and deep application of hysteresis SMC materials in the sanitary industry

Method used

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  • High-strength high-toughness unsaturated polyester resin for sheet molding compounds and preparation method of

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preparation example Construction

[0022] The preparation method of the high-strength and high-toughness unsaturated polyester resin for sheet molding compound described in this embodiment, its steps are as follows:

[0023] 1. Under the condition of nitrogen flow rate of 2-6m3 / h, add isophthalic acid, tetrahydrophthalic anhydride, 2-methyl 1,3 propanediol and neopentyl glycol into the reactor, and raise the temperature to 180-210°C. React until the acid value reaches 8-12mgKOH / g;

[0024] 2. Cool the material to 140-150°C, add fumaric acid and methyl hydroquinone, raise the temperature to 190-210°C, react until the acid value reaches 60-65 mgKOH / g, increase the nitrogen flow rate to 30 -40m3 / h, continue to react to 30-35 mgKOH / g; turn off nitrogen, vacuumize the reactor for 30-40min, stop vacuuming, continue to feed nitrogen, keep nitrogen flow 36-40m3 / h, react to acid value Reach 20-24mgKOH / g, cool down to 160-180°C to obtain unsaturated polyester;

[0025] 3. Add the unsaturated polyester prepared above to...

Embodiment 2

[0027] The high-strength and high-toughness unsaturated polyester resin for sheet molding compound described in this embodiment is composed of the following components in parts by weight: 225 parts of tetrahydrophthalic anhydride, 525 parts of isophthalic acid, 4750 parts of fumaric acid Parts, 800 parts of 2-methyl-1,3-propanediol, 3800 parts of neopentyl glycol, 800 parts of styrene, 4100 parts of isobutyl methacrylate, 3 parts of hydroquinone, 4 parts of methyl hydroquinone, 2, 5 parts of 6-di-tert-butyl-p-cresol; its preparation method is the same as that of Example 1.

Embodiment 3

[0029] The high-strength and high-toughness unsaturated polyester resin for sheet molding compound described in this embodiment is composed of the following components in parts by weight: 225 parts of tetrahydrophthalic anhydride, 525 parts of isophthalic acid, 4850 parts of fumaric acid Parts, 850 parts of 2-methyl-1,3-propanediol, 3750 parts of neopentyl glycol, 800 parts of styrene, 4100 parts of isobutyl methacrylate, 3 parts of hydroquinone, 4 parts of methyl hydroquinone, 2, 5 parts of 6-di-tert-butyl-p-cresol; its preparation method is the same as that of Example 1.

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Abstract

The invention relates to the technical field of preparation of macromolecular compounds, in particular to a high-strength high-toughness unsaturated polyester resin for sheet molding compounds and a preparation method thereof. The high-strength high-toughness unsaturated polyester resin comprises, by weight, 200-250 parts of tetrahydrophthalic anhydride, 500-550 parts of isophthalic acid, 4750-4950 parts of fumaric acid, 750-850 parts of 2-methyl-1,3-propanediol, 3750-3850 parts of neopentyl glycol, 700-900 parts of styrene, 4000-4200 parts of isobutyl methacrylate, 2-5 parts of hydroquinone,2-5 parts of methylhydroquinone, and 2-6 parts of 2,6-di-tert-butyl-4-methylphenol. The prepared unsaturated polyester resin herein imparts good yellowing resistance and water resistance to SMC (sheetmolding compound) products, has high activity and has thermal deformation temperature of 100 DEG C and above.

Description

technical field [0001] The invention relates to the technical field of polymer compound preparation, in particular to a high-strength and high-toughness unsaturated polyester resin for sheet molding materials and a preparation method thereof. Background technique [0002] The unsaturated polyester resin for sheet molding compound SMC (Sheet molding compound) is a mixture solution obtained by dissolving a multifunctional polymer compound in an active monomer. The unsaturated polyester main chain in the solution is distributed with unsaturated Double bonds, carboxyl or hydroxyl groups are also distributed at the chain ends of the unsaturated polyester main chain. Unsaturated polyester resin is used to produce sheet molding compound SMC materials, and the SMC products obtained by hot pressing have excellent engineering mechanical properties, electrical insulation properties, thermal stability, and corrosion resistance. SMC products have a wide range of applications, mainly in ...

Claims

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Application Information

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IPC IPC(8): C08F283/01C08F220/18C08F212/08C08G63/553C08G63/78
Inventor 孔德轮宣维栋蒋明伟金湘玉
Owner CHANGZHOU TIANMA GROUP CO LTD
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