阅读说明：本技术 一种高强度环保阻燃聚丙烯复合材料及其制备方法 (High-strength environment-friendly flame-retardant polypropylene composite material and preparation method thereof ) 是由 杨桂生 方永炜 姚晨光 邹冲 朱敏 项灵芝 于 2020-07-06 设计创作，主要内容包括：本发明公开了一种高强度环保阻燃聚丙烯复合材料,由下述组份按重量份制备而成：聚丙烯100份,氢氧化镁5-10份,多晶莫来石纤维5-10份,偶联剂KH550 1-2份,抗氧剂1098 0.3-0.5份,抗氧剂168 0.3-0.5份,润滑剂0.5-1份。本发明通过使用多晶莫来石纤维与氢氧化镁进行复配,来增加聚丙烯复合材料的阻燃性及力学性能,得到的复合材料具有优异的环保阻燃能力的同时,力学性能良好,具有较高的强度。本发明的另一个目的是提供上述高强度环保阻燃聚丙烯复合材料的制备方法。本发明采用分批混合的方法制备得到的高强度环保阻燃聚丙烯复合材料,综合性能优异。(The invention discloses a high-strength environment-friendly flame-retardant polypropylene composite material which is prepared from the following components in parts by weight: 100 parts of polypropylene, 5-10 parts of magnesium hydroxide, 5-10 parts of polycrystalline mullite fiber, 1-2 parts of coupling agent KH550, 10980.3-0.5 part of antioxidant, 1680.3-0.5 part of antioxidant and 0.5-1 part of lubricant. According to the invention, the flame retardance and the mechanical property of the polypropylene composite material are increased by compounding the polycrystalline mullite fiber and the magnesium hydroxide, and the obtained composite material has excellent environment-friendly flame retardant capability, good mechanical property and higher strength. The invention also aims to provide a preparation method of the high-strength environment-friendly flame-retardant polypropylene composite material. The high-strength environment-friendly flame-retardant polypropylene composite material prepared by the batch mixing method has excellent comprehensive performance.)

1. A high-strength environment-friendly flame-retardant polypropylene composite material is characterized in that: the paint is prepared from the following components in parts by weight:

2. the high-strength environment-friendly flame-retardant polypropylene composite material according to claim 1, wherein: the melt index of the polypropylene under the conditions of 230 ℃ and 2.16kg of load is 20-50g/10 min.

3. The high-strength environment-friendly flame-retardant polypropylene composite material according to claim 1, wherein: the purity of the magnesium hydroxide is more than 96 percent.

4. The high-strength environment-friendly flame-retardant polypropylene composite material according to claim 1, wherein: the average length of the polycrystalline mullite fiber is 5-50mm, and the average diameter of the polycrystalline mullite fiber is 2.8-3.3 mu m.

5. The high-strength environment-friendly flame-retardant polypropylene composite material according to claim 1, wherein: the lubricant is oleamide.

6. The method for preparing the high-strength environment-friendly flame-retardant polypropylene composite material as claimed in any one of claims 1 to 5, wherein: the method comprises the following steps:

(1) adding 5-10 parts of magnesium hydroxide, 5-10 parts of polycrystalline mullite fiber, 1-2 parts of coupling agent KH550 and 0.5-1 part of lubricating agent into a mixer, uniformly mixing, and cooling to normal temperature to obtain a mixture A;

(2) adding 100 parts of polypropylene, 0.3-0.5 part of antioxidant 1098 and 0.3-0.5 part of antioxidant 168 into the mixture A, and mixing at normal temperature for 1-2 minutes to obtain a mixture B; and adding the mixture B into a double-screw extruder, and extruding and granulating to obtain a target product.

7. The method of claim 6, wherein: in the step (1), the temperature of the mixer is 40-50 ℃, the rotating speed is 200-.

8. The method of claim 6, wherein: in the step (2), the temperature of the first zone of the twin-screw extruder is 150-.

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-strength environment-friendly flame-retardant polypropylene composite material and a preparation method thereof.

Background

Magnesium hydroxide and magnesium hydroxide are one of the most main varieties of the existing inorganic environment-friendly flame retardants, and the proportion of the magnesium hydroxide and the magnesium hydroxide in the total consumption of the flame retardants is always kept above 40%. They have three functions of flame retardance, smoke abatement and filling, are cheaper than halogen and phosphorus flame retardant systems, are nonvolatile, nontoxic and capable of generating synergistic environment-friendly flame retardant effect with various substances, and are praised as pollution-free inorganic environment-friendly flame retardants.

Polypropylene, as one of the longest common plastics used at present, has the advantages of light weight, excellent mechanical properties, better chemical resistance, weather resistance and the like, and is widely applied to the fields of industry, agriculture, automobile industry, household appliances, electronic appliances and the like. However, because the addition amount of the magnesium hydroxide is large, the addition amount of 30-60% of the UL94 standard V-0 grade is required, the influence on the mechanical property of the material is large, and the density and the cost are high.

Polycrystalline mullite fiber (Mg (OH)₂) It is a rare fibrous brucite at home and abroad, has the characteristics of white color, easy splitting, high down yield and the like, has unique and excellent performance and low price, and becomes the preferred natural substitute of asbestos at present.

Disclosure of Invention

The invention aims to provide a high-strength environment-friendly flame-retardant polypropylene composite material to solve the problems in the prior art.

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

the high-strength environment-friendly flame-retardant polypropylene composite material is prepared from the following components in parts by weight:

as a preferred technical scheme, the melt index of the polypropylene under the conditions of 230 ℃ and 2.16kg of load is 20-50g/10 min.

Preferably, the purity of the magnesium hydroxide is more than 96%, and the particle size is 3000 meshes.

According to a preferable technical scheme, the average length of the polycrystalline mullite fiber is 5-50mm, and the average diameter of the polycrystalline mullite fiber is 2.8-3.3 mu m.

As a preferred embodiment, the lubricant is oleamide.

The invention also aims to provide a preparation method of the high-strength environment-friendly flame-retardant polypropylene composite material, which comprises the following steps:

(1) adding 5-10 parts of magnesium hydroxide, 5-10 parts of polycrystalline mullite fiber, 1-2 parts of coupling agent KH550 and 0.5-1 part of lubricant into a mixer, uniformly mixing, and cooling to normal temperature to obtain a mixture A;

(2) adding 100 parts of polypropylene, 0.3-0.5 part of antioxidant 1098 and 0.3-0.5 part of antioxidant 168 into the mixture A, and mixing at normal temperature for 1-2 minutes to obtain a mixture B; and adding the mixture B into a double-screw extruder, and extruding and granulating to obtain a target product.

As a preferable technical scheme, in the step (1), the temperature of the mixer is 40-50 ℃, the rotating speed is 200-300 r/min, and the mixing time is 3-5 minutes.

As a preferable technical scheme, in the step (2), the temperature of the first zone of the double-screw extruder is 150-.

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

(1) according to the invention, the flame retardance and the mechanical property of the polypropylene composite material are increased by compounding the polycrystalline mullite fiber and the magnesium hydroxide, and the obtained composite material has excellent environment-friendly flame retardant capability, good mechanical property and higher strength. And the polycrystalline mullite fiber is low in price, and a product with excellent performance is obtained on the premise of less production cost, so that the economic benefit is good.

(2) The high-strength environment-friendly flame-retardant polypropylene composite material is prepared by a batch mixing method, namely, the magnesium hydroxide, the polycrystalline mullite fiber, the coupling agent KH550 and the lubricant are firstly mixed to obtain a mixture, and then the polypropylene, the antioxidant 1098 and the antioxidant 168 are added into the mixture, so that the prepared product has excellent comprehensive performance.

Detailed Description

The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The types and suppliers of the reagents used in the following examples and comparative examples are as follows:

the polypropylene is BX3800 of SK company in Korea, and the melt index is 30g/10 min;

magnesium hydroxide was purchased from Suzhou, Zeze, New magnesium materials science and technology, Inc., with a particle size of 3000 mesh.

The average length of the polycrystalline mullite fiber is 10mm, the average diameter of the fiber is 3 mu m, and the manufacturer is Zhejiang Delqing Lanya crystal fiber Co., Ltd, and the brand is LY-1260;

the manufacturer of the coupling agent KH550, Zhengzhou Mitsui Chemicals, Inc.

The lubricant is oleamide purchased from Haimen Hualong oil and fat auxiliary agent factory, white powder, melting point 72-82 deg.C, and amide content greater than 99.9%.

The reagents are provided only for illustrating the sources and components of the reagents used in the experiments of the present invention, so as to be fully disclosed, and do not indicate that the present invention cannot be realized by using other reagents of the same type or other reagents supplied by other suppliers.

The present invention will be further described below by way of specific embodiments, in which the test methods for the respective properties are as follows: tensile Properties were measured according to ASTM D638 (tensile Rate 5mm/min), tensile bars (dumbbell type) 170 mm. times.13 mm. times.3.2 mm; flexural Properties were measured according to ASTM D790 (bending speed 1.25mm/min), bending specimen 127 mm. times.13 mm. times.3.2 mm; the notched impact performance of the cantilever beam is tested according to ASTM D256, the notched impact spline is 127mm multiplied by 13mm multiplied by 3.2mm, the notch depth is 1/5; the environmental protection flame retardant property is tested according to UL-94 standard, and the thickness of a sample strip is 1.6 mm.

Example 1

5 parts of magnesium hydroxide, 5 parts of polycrystalline mullite fiber, 1 part of coupling agent KH550 and 0.5 part of lubricating agent are added into a mixer, the temperature is set to be 40 ℃, the rotating speed is 200 r/min, and the mixture is mixed for 3 minutes. After the temperature is reduced to the normal temperature, 100 parts of polypropylene, 0.3 part of antioxidant 1098, 0.3 part of antioxidant 168 are added, the mixture is mixed at the normal temperature for 1 minute at 100 revolutions per minute.

And adding the mixed materials from a feed inlet of a double-screw extruder, extruding and granulating. The first zone temperature of the twin-screw extruder is 150 ℃, the second zone temperature is 160 ℃, the third zone temperature is 180 ℃, the fourth zone temperature is 200 ℃, the fifth zone temperature is 200 ℃ and the sixth zone temperature is 210 ℃.

Example 2

10 parts of magnesium hydroxide, 10 parts of polycrystalline mullite fiber, 2 parts of coupling agent KH550 and 1 part of lubricating agent are added into a mixer, the temperature is set to be 50 ℃, the rotating speed is 300 r/min, and the mixture is mixed for 5 minutes. After the temperature is reduced to the normal temperature, 100 parts of polypropylene, 0.5 part of antioxidant 1098, 0.5 part of antioxidant 168 are added, 200 r/min and mixed for 2 minutes at the normal temperature.

And adding the mixed materials from a feed inlet of a double-screw extruder, extruding and granulating. The first zone temperature of the twin-screw extruder is 160 ℃, the second zone temperature is 180 ℃, the third zone temperature is 200 ℃, the fourth zone temperature is 210 ℃, the fifth zone temperature is 210 ℃ and the sixth zone temperature is 215 ℃.

Example 3

Adding 8 parts of magnesium hydroxide, 8 parts of polycrystalline mullite fiber, 2 parts of coupling agent KH550 and 1 part of lubricating agent into a mixer, setting the temperature at 45 ℃, and mixing for 3 minutes at the rotating speed of 250 revolutions per minute. After the temperature is reduced to the normal temperature, 100 parts of polypropylene, 0.5 part of antioxidant 1098, 0.5 part of antioxidant 168 are added, 200 r/min and mixed for 2 minutes at the normal temperature.

And adding the mixed materials from a feed inlet of a double-screw extruder, extruding and granulating. The first zone temperature of the twin-screw extruder is 160 ℃, the second zone temperature is 170 ℃, the third zone temperature is 190 ℃, the fourth zone temperature is 200 ℃, the fifth zone temperature is 210 ℃ and the sixth zone temperature is 215 ℃.

Comparative example 1

16 parts of magnesium hydroxide, 2 parts of coupling agent KH550 and 1 part of lubricating agent are added into a mixer, the temperature is set to 45 ℃, the rotating speed is 250 r/min, and the mixture is mixed for 3 minutes. After the temperature is reduced to the normal temperature, 100 parts of polypropylene, 0.5 part of antioxidant 1098, 0.5 part of antioxidant 168 are added, 200 r/min and mixed for 2 minutes at the normal temperature.

And adding the mixed materials from a feed inlet of a double-screw extruder, extruding and granulating. The first zone temperature of the twin-screw extruder is 160 ℃, the second zone temperature is 170 ℃, the third zone temperature is 190 ℃, the fourth zone temperature is 200 ℃, the fifth zone temperature is 210 ℃ and the sixth zone temperature is 215 ℃.

Comparative example 2

16 parts of polycrystalline mullite fiber, 2 parts of coupling agent KH550 and 1 part of lubricating agent are added into a mixer, the temperature is set to 45 ℃, the rotating speed is 250 revolutions per minute, and the mixture is mixed for 3 minutes. After the temperature is reduced to the normal temperature, 100 parts of polypropylene, 0.5 part of antioxidant 1098, 0.5 part of antioxidant 168 are added, 200 r/min and mixed for 2 minutes at the normal temperature.

And adding the mixed materials from a feed inlet of a double-screw extruder, extruding and granulating. The first zone temperature of the twin-screw extruder is 160 ℃, the second zone temperature is 170 ℃, the third zone temperature is 190 ℃, the fourth zone temperature is 200 ℃, the fifth zone temperature is 210 ℃ and the sixth zone temperature is 215 ℃.

Comparative example 3

Mixing 8 parts of magnesium hydroxide, 8 parts of polycrystalline mullite fiber, 2 parts of coupling agent KH550,1 part of lubricant, 100 parts of polypropylene, 0.5 part of antioxidant 1098, 0.5 part of antioxidant 168 at normal temperature for 2 minutes.

And adding the mixed materials from a feed inlet of a double-screw extruder, extruding and granulating. The first zone temperature of the twin-screw extruder is 160 ℃, the second zone temperature is 170 ℃, the third zone temperature is 190 ℃, the fourth zone temperature is 200 ℃, the fifth zone temperature is 210 ℃ and the sixth zone temperature is 215 ℃.

Comparative example 4

In the comparative example, the polypropylene producer Yanshan petrochemical has a designation K1008 and a melt index of 10g/10 min.

Mixing 8 parts of magnesium hydroxide, 8 parts of polycrystalline mullite fiber, 2 parts of coupling agent KH550,1 part of lubricant, 100 parts of polypropylene, 0.5 part of antioxidant 1098, 0.5 part of antioxidant 168 at normal temperature for 2 minutes.

And adding the mixed materials from a feed inlet of a double-screw extruder, extruding and granulating. The first zone temperature of the twin-screw extruder is 160 ℃, the second zone temperature is 170 ℃, the third zone temperature is 190 ℃, the fourth zone temperature is 200 ℃, the fifth zone temperature is 210 ℃ and the sixth zone temperature is 215 ℃.

The performance of each example and comparative example was tested as follows:

TABLE 1 Performance data

As shown in Table 1, by comparing comparative examples 1-2 with examples 1-3, the flame retardance and mechanical properties of the polypropylene composite material are improved by compounding the polycrystalline mullite fiber and the magnesium hydroxide, and the obtained composite material has excellent environment-friendly flame retardant capability and mechanical properties; as can be seen from comparative example 3, the product obtained by the present invention is more excellent in properties by employing the batch mixing preparation method.