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Silicone master batch with long-lasting scratch resistance, and preparation method thereof

A silicone and scratch-resistant technology, which is applied in the field of plastic modification additives, can solve the problems of unstable scratch resistance, affecting the mechanical properties of the substrate, and the decline of scratch resistance, so as to improve the plastic processing performance and durable Effective scratch resistance and increased stability

Active Publication Date: 2019-10-22
CHENGDU GUIBAO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the application process, it was found that the compatibility between ordinary silicone and polypropylene resin is not good, which easily leads to unstable scratch resistance and poor durability of polypropylene composite materials, especially after long-term use, the scratch resistance performance is significantly reduced, and at the same time Accompanied by stress whitening, surface stickiness, affecting the mechanical properties of the substrate, etc.
CN105037955A discloses a scratch-resistant, stress-whitening-resistant polypropylene composition and its preparation method. The patent significantly improves the polypropylene composition's resistance Scratch performance while addressing the high stress whitening associated with the addition of common polyorganosiloxanes
However, the grafted part of the grafted modified silicone in the patent is polypropylene, which does not contain active functional groups, and will not chemically interact with inorganic fillers when added to the composite material. At the same time, the patent contains low molecular weight grafted polysiloxane Alkanes, easy to migrate, still have scratch resistance durability issues

Method used

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  • Silicone master batch with long-lasting scratch resistance, and preparation method thereof
  • Silicone master batch with long-lasting scratch resistance, and preparation method thereof
  • Silicone master batch with long-lasting scratch resistance, and preparation method thereof

Examples

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preparation example Construction

[0031] Preparation Examples and Comparative Examples of Durable Scratch-resistant Silicone Masterbatch

[0032] See Table 1 for the silicone masterbatch components and the mass parts of the components in the examples and comparative examples of the present invention.

[0033] Table 1 Silicone Masterbatch Components and Component Mass Parts

[0034]

[0035] In the above examples and comparative examples, common silicone refers to methyl vinyl silicone rubber.

[0036] The polypropylene used is a homopolypropylene with a melt flow rate of 25g / 10min; the reinforcing agent used is fumed silica with an average particle size of 20nm; The deodorant is a commercially available product.

Embodiment 1

[0037] The modified silicones used in Examples 1-5 are modified polysiloxane alkyl groups with side long chains of different structures, and the molecular chain structure and anchoring mechanism of the modified silicones are shown in figure 2 As shown; the common silicone used in the comparative example is methyl vinyl silicone rubber, and the average molecular weight is similar to that of the modified silicone used in Example 1.

[0038] The organosilicon masterbatch preparation process route in each above-mentioned embodiment and comparative example sees figure 1 : Add the measured polypropylene, modified silicone, reinforcing agent, anti-aging agent and deodorant to a pressurized internal mixer for melt mixing. The temperature of the internal mixer is 210°C, and the internal mixer is mixed for 15 minutes; mixing The good material is transported to the twin-screw extruder equipped with forced feeding device for extrusion and granulation. The screw feeding section of the ext...

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Abstract

The invention discloses a silicone master batch with long-lasting scratch resistance, and a preparation method thereof. The raw materials of the master batch contain modified silicone, the modified silicone is an active group-containing long side chain-grafted high molecular weight polysiloxane, and the raw materials also contain polypropylene, a reinforcing agent, an anti-aging agent and other assistants. The raw materials are internally mixed at 200-220 DEG C, and then are extruded and granulated under certain conditions by a twin-screw extruder to obtain the silicone master batch with long-lasting scratch resistance. The silicone master batch prepared by the invention contains the active group-containing long side chain-grafted high molecular weight polysiloxane, so the problems of unabiding scratch resistance and stress whitening of common silicone are well solved, the plastic processing performance is improved, and the device wearing is reduced. The preparation method of the invention has the advantages of simple process, environmental protection, safety, good repeatability, and easiness in industrialization. The silicone masterbatch prepared in the invention is mainly used for preparing a scratch-resistant automotive interior polypropylene composite material.

Description

technical field [0001] The invention relates to the field of plastic modification additives, in particular to a silicone masterbatch with durable and stable scratch resistance, stress whitening resistance and processing lubrication and a preparation method thereof. Background technique [0002] Polypropylene materials for automotive interiors are relatively low in hardness. During use, the surface is easily scratched, which not only affects the appearance, but also shortens the service life of the material. Silicone has a very low surface tension and is easy to accumulate on the surface of the material to form a thin lubricating layer, which can reduce the friction coefficient of the material surface, thereby improving the scratch resistance of the material surface. [0003] Patent CN104987724A discloses a scratch-resistant masterbatch with high silicone content, the scratch-resistant active ingredient is high molecular weight silicone oil or silicone rubber, including methy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L23/12C08K3/36C08J3/22
CPCC08J3/226C08J2483/04C08J2423/12C08J2323/14C08K3/36
Inventor 漆刚桑威纳王天强黄强李步春傅强
Owner CHENGDU GUIBAO SCI & TECH
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