阅读说明：本技术 一种耐刮擦遮光高反射聚丙烯复合材料及其制备方法 (Scratch-resistant shading high-reflection polypropylene composite material and preparation method thereof ) 是由 梁伟成 陈晓东 娄小安 孟成铭 徐东东 王锡军 于 2019-12-13 设计创作，主要内容包括：本发明提供了一种耐刮擦遮光高反射聚丙烯复合材料,包括以下重量份含量的各组分：共聚聚丙烯100份,离聚物100份,云母粉20-50份,二氧化钛20-50份,玻璃微珠20-50份。其制备方法为：A、将玻璃微珠与二氧化钛放入高速搅拌处理；B、将聚丙烯树脂、离聚物,云母粉一同高速搅拌混合；C、将步骤A和步骤B获得的混合材料加入双螺杆挤出机中,其中步骤A获得的混合材料采用侧喂加入,挤出造粒,温度为210℃-220℃,转速为500-600r/min,即得所述复合材料。该复合材料遮光效果好,反射率高并且具有很好的耐刮擦性能。(The invention provides a scratch-resistant shading high-reflection polypropylene composite material which comprises the following components in parts by weight: 100 parts of polypropylene copolymer, 100 parts of ionomer, 20-50 parts of mica powder, 20-50 parts of titanium dioxide and 20-50 parts of glass beads. The preparation method comprises the following steps: A. putting the glass beads and titanium dioxide into a high-speed stirring treatment; B. stirring and mixing the polypropylene resin, the ionomer and the mica powder at a high speed; C. and (3) adding the mixed material obtained in the step (A) and the step (B) into a double-screw extruder, wherein the mixed material obtained in the step (A) is added by side feeding, and is extruded and granulated at the temperature of 210-220 ℃ and the rotating speed of 500-600r/min, so as to obtain the composite material. The composite material has good shading effect, high reflectivity and good scratch resistance.)

1. The scratch-resistant shading high-reflection polypropylene composite material is characterized by comprising the following components in parts by weight:

2. the polypropylene composite material as claimed in claim 1, wherein the polypropylene copolymer is EPR type polypropylene copolymer and has a melt index of 1-3g/10 min.

3. The polypropylene composite material as claimed in claim 1, wherein the ionomer is surlyn resin and has a melt index of 4-5g/10 min.

4. The polypropylene composite material as claimed in claim 1, wherein the titanium dioxide has a particle size of 5-10 μm.

5. The polypropylene composite material with scratch resistance, light shading and high reflection according to claim 1, wherein the glass beads are porous glass beads, and the pore diameter is 15-25 μm.

6. The polypropylene composite material with scratch resistance, light shading and high reflection according to claim 1, wherein the mica powder is auro mica powder with a particle size of 20-40 μm.

7. The preparation method of the scratch-resistant shading high-reflection polypropylene composite material according to claim 1, characterized by comprising the following steps:

A. putting the glass beads and titanium dioxide into a high-speed stirring treatment;

B. stirring and mixing the polypropylene resin, the ionomer and the mica powder at a high speed;

C. and (3) adding the mixed material obtained in the step (A) and the step (B) into a double-screw extruder, wherein the mixed material obtained in the step (A) is added by side feeding, and is extruded and granulated at the temperature of 210-220 ℃ and the rotating speed of 500-600r/min, so as to obtain the composite material.

8. The preparation method of the scratch-resistant shading high-reflection polypropylene composite material as claimed in claim 7, wherein in the step A, the high-speed stirring is carried out at a rotating speed of 65-75 revolutions per minute for 1 hour; in the step B, the high-speed stirring speed is 45-50 r/min, and the mixing time is 2-5 min.

Technical Field

The invention belongs to the technical field of polymer composite materials, and particularly relates to a scratch-resistant shading high-reflection polypropylene composite material and a preparation method thereof.

Background

The polypropylene material has the advantages of corrosion resistance, easy processing, low cost, recoverability, excellent mechanical property and the like, and is widely applied to the fields of automobile household appliances and the like.

With the wider application of the LED photoelectric technology, when designing a photoelectric product, light transmission is often required to be reduced or prevented, the use of a plastic which is light and easy to mold is the best choice, and China is both a large country for manufacturing lighting electrical products and a large country for consuming lighting electrical products, and has a perfect manufacturing chain of lighting electrical products, and products are sold in a plurality of countries and regions.

Chinese patent 201610682477.1 discloses a high opacity polypropylene composite material, which is prepared from the following components: polypropylene, polyolefin elastomer, titanium dioxide, mica powder, an antioxidant, a nucleating agent and a lubricant, wherein the mesh number of the titanium dioxide is 350-500 meshes, the particle size of the mica powder is 400-500 meshes, and the mass ratio of the mica powder to the titanium dioxide is 0.5-2.0: 1. however, this solution does not involve the field of reflection and the scratch resistance is poor due to the use of the PP matrix.

Therefore, the research on the scratch-resistant polypropylene composite material with good shading effect and high reflectivity is of great significance.

Disclosure of Invention

The invention aims to solve the problems of low light reflectivity and poor scratch resistance of a shading polypropylene material in the prior art, and provides a scratch-resistant shading high-reflection polypropylene composite material and a preparation method thereof.

The core of the invention is to improve the reflectivity and scratch resistance of the polypropylene material by utilizing the high gloss and high hardness of the surlyn resin, and provide the shading performance by utilizing the low light transmittance of the polypropylene copolymer and the mica. By utilizing the difference of melting point and fluidity between the surlyn resin and the polypropylene material, the surlyn resin can flow to the surface in the composite material more quickly to form a high-hardness high-reflection resin layer in the injection molding process, and the copolymerized polypropylene resin can play a role in shading light when being left inside, so that light rays entering the material due to refraction are shielded.

The purpose of the invention is realized by the following technical scheme:

the invention provides a scratch-resistant shading high-reflection polypropylene composite material which comprises the following components in parts by weight:

preferably, the scratch-resistant shading high-reflection polypropylene composite material comprises the following components in parts by weight: 100 parts of copolymerized polypropylene, 100 parts of surlyn resin, 30-35 parts of mica powder, 20-30 parts of porous glass beads and 20-30 parts of titanium dioxide.

Preferably, the scratch-resistant shading high-reflection polypropylene composite material comprises the following components in parts by weight: 100 parts of copolymerized polypropylene, 100 parts of surlyn resin, 20-30 parts of mica powder, 30-35 parts of porous glass beads and 30-35 parts of titanium dioxide.

Preferably, the scratch-resistant shading high-reflection polypropylene composite material comprises the following components in parts by weight: 100 parts of copolymerized polypropylene, 100 parts of surlyn resin, 35-50 parts of mica powder, 35-45 parts of porous glass beads and 35-40 parts of titanium dioxide.

Preferably, the polypropylene copolymer is EPR (ethylene propylene rubber) polypropylene copolymer, the melt index is 1-3g/10min (the test condition is 2.16KG 230 ℃), because the light shading effect of the polypropylene copolymer is the best, the polypropylene copolymer is used for shading light; the polypropylene containing EPR copolymer is adopted, but the polypropylene of common ethylene-propylene copolymer is adopted, because the surlyn is ethylene-acrylic resin, according to the principle of similar compatibility, the repulsive force between the EPR polypropylene and the surlyn resin is larger, the compatibility is poorer, so that the two resins can be better layered, the melt index is 1-3g/10min, so that more polypropylene resin is left in the inner layer of a workpiece during injection molding to form a light shielding layer, and the surlyn resin which is earlier melted and better in flowability flows to the outer layer of the workpiece to form a reflecting layer.

Preferably, the ionomer is a surlyn resin having a melt index of 4 to 10g/10min (test conditions of 2.16KG 190 ℃). The Surlyn resin plays a role in high reflection and scratch resistance, the ionomer Surlyn resin is lower in melting point and can melt before the copolymerization polypropylene at about 85 ℃, the Surlyn resin can form a viscous state earlier than the polypropylene during processing, and the fluidity is better, so that the Surlyn resin can be more quickly separated out of the surface of a workpiece to form a resin layer with scratch resistance and high reflection effects, the layering is not obvious due to too low melt index, the fluidity difference of the two resins is too large due to too high melt index, the interface bonding force after the two resins are layered is too poor, and the comprehensive performance of the material is not enough.

Preferably, the titanium dioxide has a particle size of 5 to 10 μm. The titanium dioxide is used for shading, the titanium dioxide with the particle size of 5-10 mu m is adopted, on one hand, the titanium dioxide with the lower particle size can ensure that the titanium dioxide has good shading effect, on the other hand, the titanium dioxide can enter the gap of the porous glass beads to form an independent structural unit wrapping the titanium dioxide in the glass beads, and the independent structural unit utilizes the titanium dioxide to complete shading while utilizing the reflection of the glass beads.

Preferably, the glass beads are porous glass beads, and the pore diameter is 15-25 μm. The glass beads are used for playing a role in reflection, the glass beads with the aperture of 15-25 mu m are adopted, the aperture is larger than that of titanium dioxide on one hand, the titanium dioxide can enter gaps in pretreatment, but the aperture cannot be too large, so that excessive titanium dioxide can enter the gaps of the glass beads, the titanium dioxide is agglomerated, the particle size of the titanium dioxide is increased, and the inherent light shielding performance of the titanium dioxide is reduced.

Preferably, the mica powder is auro mica powder with the particle size of 20-40 μm. The mica powder is used for shading, the mica is of a sheet structure and can form a more compact and complete shading structure with titanium dioxide of a granular structure, and pores generated when granular fillers are stacked in resin are filled. The phlogopite is adopted because the phlogopite contains metal elements such as magnesium, iron, aluminum and the like, metal ions such as zinc, magnesium, aluminum and the like are introduced into a main chain of the surlyn resin during polymerization to serve as a catalyst for forming cross-linking bonds, the cross-linking bonds are dissociated during processing of the surlyn resin, and the cross-linking bonds of the surlyn resin are formed again after the surlyn resin passes through a double-screw extruder. The metal elements in the phlogopite and the metal elements of the cross-linking bonds have larger attraction, so that the phlogopite powder can be better inserted into a cross-linking network structure formed by surlyn, and a more reasonable shading and reflecting system is formed.

The invention also provides a preparation method of the scratch-resistant shading high-reflection polypropylene composite material, which comprises the following steps:

A. putting the glass beads and titanium dioxide into a high-speed stirring treatment;

B. stirring and mixing the polypropylene resin, the ionomer and the mica powder at a high speed;

C. and (3) adding the mixed material obtained in the step (A) and the step (B) into a double-screw extruder, wherein the mixed material obtained in the step (A) is added by side feeding, and is extruded and granulated at the temperature of 210-220 ℃ and the rotating speed of 500-600r/min, so as to obtain the composite material.

Preferably, in the step A, the rotation speed of the high-speed stirring is 65-75 r/min, and the treatment time is 1 hour; in the step B, the high-speed stirring speed is 45-50 r/min, and the mixing time is 2-5 min.

Compared with the prior art, the invention has the following beneficial effects:

(1) the invention adopts the high-melting-index surlyn resin and the low-melting-index copolymerized polypropylene resin, utilizes the difference of fluidity, melting point and compatibility to enable the surlyn resin layer to finish the first reflection of light, and the polypropylene resin shades light, so that the surface of the composite material is resistant to scratch and high reflection, and the internal shading effect of the material is good, thereby realizing that the composite material has the properties of shading, high reflection and scraping resistance at the same time.

(2) According to the invention, titanium dioxide and porous glass beads with appropriate particle sizes are adopted, and the titanium dioxide is wrapped by the appropriate glass beads to form independent structural units meeting requirements of shading and high reflection, so that shading and reflection effects are greatly improved.

(3) The invention selects the phlogopite as the shading material, can form a better interpenetrating network with the surlyn resin in the processing process, enhances the binding force between the filler and the resin, and improves the shading and reflecting effects.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

The copolymerized polypropylene used in examples 1 to 10 below was an EPR rubber block-copolymerized polypropylene, EPR60 produced by Basel corporation, and had a melt index of 3g/10min at 2.16KG at 230 ℃; the ionomer used was surlyn resin, 8945 from dupont, usa, with a melt index of 4.5g/10min at 2.16KG × 190 ℃; the mica powder is auro mica powder with the particle size of 20-40 mu m; the adopted titanium dioxide has the particle size of 5-10 mu m; the aperture of the adopted porous glass bead is 15-25 μm.