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Siloxane-modified thermoplastic material and preparation method thereof

A thermoplastic material and siloxane modification technology, which is applied in the field of cross-linked siloxane modified thermoplastic material and its preparation, can solve the problems of poor heat resistance and aging resistance, and achieve performance enhancement and bright surface , the effect of reducing the dispersion size

Active Publication Date: 2014-03-12
SHENZHEN CITY SQUARE SILICONE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a siloxane-modified thermoplastic material and its preparation method, thereby solving the problem of poor heat resistance and aging resistance of existing thermoplastic materials

Method used

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  • Siloxane-modified thermoplastic material and preparation method thereof
  • Siloxane-modified thermoplastic material and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0050] In order to promote the dispersion of siloxane, the preparation method of the present invention is divided into two steps, and the preparation method comprises the following steps:

[0051] Step 1, preparation of base material. Add a certain amount of thermoplastic material, high molecular weight siloxane, silicone resin, and compatibilizer into the high-speed mixer at the same time, and blend for 3 to 4 minutes, then add a crosslinking agent, and the catalyst reacts and blends for 3 to 5 minutes. Material is cooled to room temperature to obtain base material;

[0052] Step 2. Take 100 parts by mass of the base material in step 1 and mix them uniformly with 50-150 parts by mass of thermoplastic materials, and melt and blend them through an internal mixer or a twin-screw extruder to obtain the final product—siloxane-modified thermoplastic Material.

[0053] In the melt blending process of the second step, the high molecular weight organosiloxane reacts and cross-links ...

Embodiment 1～4

[0055] Examples 1 to 4: Add polysiloxane, silicone resin, polyisobutylene, and half of the amount of polypropylene (PP) to a mixer in the parts by weight listed in Table 1, and stir at high speed for 3 minutes, and add the mixture of these raw materials to the double Melting extrusion and granulation in the screw extruder, the extrusion process is: 170-180 in the first zone, 180-190 in the second zone, 190-200 in the third zone, 180-190 in the fourth zone, the screw speed is 400r / min, vacuum Degree -0.02~-0.04Mpa, to obtain high-concentration siloxane dispersion masterbatch in polypropylene. Melt the obtained dispersed masterbatch and the remaining polypropylene in a twin-screw extruder, extrude and granulate. The material ratio and properties are listed in Table 1. The comparison results show that adding a certain amount of polyisobutylene can effectively improve the properties of polysiloxane-modified polypropylene, especially the tensile strength.

[0056] Table 1

[005...

Embodiment 5～8

[0058] Embodiments 5-8: Add polysiloxane, silicone resin, polyisobutylene, and half of PP into a mixer and stir at high speed for 3 minutes in parts by weight, and add the mixture of the above-mentioned raw materials into a twin-screw extruder through melt extrusion, Granulation, the extrusion process is: 170-180 in the first zone, 180-190 in the second zone, 190-200 in the third zone, 180-190 in the fourth zone, the screw speed is 400r / min, the vacuum degree is -0.02~-0.04Mpa, and high Concentrated siloxane dispersion masterbatch in PP. Melt the obtained dispersion masterbatch and remaining PP in a twin-screw extruder, extrude and granulate. The material ratio and properties are listed in Table 2.

[0059] Table 2

[0060]

[0061] The cross-linked siloxane-modified thermoplastic material has the advantages of high heat resistance, excellent weather resistance, low coefficient of friction over time, bright surface, silky touch and the like.

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Abstract

The invention relates to a method for preparing siloxane-modified thermoplastic material, which comprises the following steps: adding 100 weight parts of thermoplastic resin, 40-80 parts of high molecular weight siloxane, 20-40 parts of silicon resin, and 5-10 parts of compatibilizer into a blender, blending for 3-4min, then adding 10-25 weight parts of cross-linking agent and 0.01 -0.5 parts of hydrosilation catalyst, reacting and blending for 3-5min, discharging, cooling to the room temperature and obtaining a base stock; taking 100 weight parts of the base stock in the step one and 50-150 weight parts of thermoplastic resin for mixing uniformly, blending through an internal mixer or a double screw extruder and obtaining the siloxane-modified thermoplastic material. The cross-linking siloxane-modified thermoplastic material made by the invention has the advantages of higher heat resistance, excellent weather resistance, lower friction factor changing along with time, smooth surface, silk touch feeling and the like.

Description

technical field [0001] The invention relates to a thermoplastic material and a preparation method thereof, in particular to a cross-linked siloxane-modified thermoplastic material and a preparation method thereof. Background technique [0002] The thermal processing of thermoplastic materials is a process of physical change. It becomes soft to flow when heated, and hardens when cooled. After repeated heating and cooling, its properties do not change and can be repeated many times. Therefore, thermoplastic materials can be plasticized and reprocessed, the processed scraps can be reused, and its plastic products can also be recycled repeatedly. The processed materials can be reused, which greatly reduces the material loss rate. This material is easy to process and shape, and can be blow molded, thermoformed and heat welded, and has good mechanical properties and wide applicability. [0003] Most of the materials used in daily life today are thermoplastic materials. Commonly u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/12C08L25/06C08L23/08C08L31/04C08L23/20C08L53/02C08L77/00C08L75/04C08L67/00C08L83/04C08L83/05C08J3/24
Inventor 李彦民
Owner SHENZHEN CITY SQUARE SILICONE MATERIALS
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