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Polypropylene material modified by magnesium hydroxide crystal whiskers and preparation method of polypropylene material

A technology of polypropylene material and magnesium hydroxide, which is applied in the field of composite materials, can solve the problems of material mechanical properties decline, poor compatibility, and different shape reinforcement effects, and achieve improved breaking strength and elongation at break, flame retardant The effect of excellent performance

Inactive Publication Date: 2016-02-17
JIANGSU DASHENG POLYMER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two main disadvantages when ordinary magnesium hydroxide products are added to polymers as a flame retardant: one is that in order to achieve a flame retardant effect, the addition of magnesium hydroxide needs to be very high to achieve a good flame retardant effect; Poor compatibility with polymer matrix
[0006] CN104987598A discloses a flame-retardant polypropylene modified plastic, which includes the following materials in parts by weight: 100-120 parts of polypropylene, 1-10 parts of calcium carbonate, 0.8-10 parts of glyceryl monostearate 3 parts, 1-3 parts of tributoxyethyl phosphate, 1-2 parts of nano-aluminum hydroxide, 1-5 parts of nano-magnesium hydroxide, 0.1-0.8 parts of polyethylene glycol; although the material is added with flame retardant The amount is small, but the compatibility between the added hydroxide and the matrix is ​​poor, resulting in a decline in the mechanical properties of the material
Ordinary magnesium hydroxide is a hexagonal flaky crystal, and the crystal grains tend to be secondary agglomerated. It is a strong polar compound with hydrophilic and oil-repellent properties, and has poor compatibility with polymer molecules.
When magnesium hydroxide is added to polymer materials, voids will be generated at the material interface, resulting in a decrease in the mechanical properties of the material (mainly tensile strength and elongation at break)
Magnesium hydroxide crystals with special morphology have a good reinforcing effect on the mechanical properties of the matrix material, but the reinforcing effect is different with different shapes

Method used

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  • Polypropylene material modified by magnesium hydroxide crystal whiskers and preparation method of polypropylene material
  • Polypropylene material modified by magnesium hydroxide crystal whiskers and preparation method of polypropylene material
  • Polypropylene material modified by magnesium hydroxide crystal whiskers and preparation method of polypropylene material

Examples

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Effect test

Embodiment 1

[0070] Embodiment 1: Preparation of a polypropylene material modified by magnesium hydroxide whiskers

[0071] (1) The banburying temperature of setting rheometer is 170 ℃, banburying time is 15min, and rotor speed is 30r / min, take by weighing 100 parts of polypropylene resin, 30 parts of magnesium hydroxide whiskers (its diameter 0.1-0.3μm, length-to-diameter ratio of 80-90), 1 part of stearic acid and 1 part of calcium stearate were poured into the Haake torque rheometer, mixed evenly, then extruded, and cooled to room temperature;

[0072] (2) Pre-press the plate vulcanizing machine first, set the pre-pressing temperature to 170°C, and the pre-pressing time to 30 minutes. After pre-pressing, adjust the temperature control knob to set the hydraulic temperature to 180°C. After the plate temperature is stable, Put the sample obtained in step (1) on the flat plate, start the hydraulic button, press the flat plate well, pressurize to 5-10MPa, keep the pressure for 1h, then stop ...

Embodiment 2

[0074] Embodiment 2: Preparation of a polypropylene material modified by magnesium hydroxide whiskers

[0075] (1) The banburying temperature of setting rheometer is 160 ℃, the banburying time is 20min, the rotor speed is 40r / min, take by weighing 100 parts of polypropylene resin, 10 parts of magnesium hydroxide whiskers (its diameter 2.5~3μm, length-to-diameter ratio of 90~100), 2 parts of ethylene bisstearamide and 2 parts of zinc stearate were poured into the Haake torque rheometer, mixed evenly, then extruded and cooled to room temperature ;

[0076] (2) Pre-press the plate vulcanizing machine first, set the pre-pressing temperature to 160°C, and the pre-pressing time to 40 minutes. After pre-pressing, adjust the temperature control knob and set the hydraulic temperature to 170°C. After the plate temperature is stable, Put the sample obtained in step (1) on the flat plate, start the hydraulic button, press the flat plate well, pressurize to 10-15MPa, keep the pressure for...

Embodiment 3

[0078] Embodiment 3: Preparation of a polypropylene material modified by magnesium hydroxide whiskers

[0079] In addition to setting the banburying temperature of the rheometer to 180°C in step (1), the banburying time to 10min, and the rotor speed to 20r / min, weigh 100 parts of polypropylene resin and 20 parts of magnesium hydroxide whiskers according to the formula (its diameter is 1.5~2.0μm, length-to-diameter ratio is 85~90), 3 parts of polyethylene wax and 3 parts of magnesium stearate; in step (2), the pre-pressing temperature is 180°C, the pre-pressing time is 20min, hydraulic pressure The temperature was 190° C., and the pressure was maintained for 0.5 h. Other steps were the same as in Example 1 to obtain the desired product.

[0080] The resulting product was subjected to a mechanical property (tensile strength and elongation at break) test and an oxygen index test, and the test results are listed in Table 1.

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Abstract

The invention provides a polypropylene material modified by magnesium hydroxide crystal whiskers and a preparation method of the polypropylene material. The material is mainly prepared from the following components in parts by weight: 100 parts of polypropylene resin, 0 to 40 parts (not including 0) of the magnesium hydroxide crystal whiskers, 0 to 3 parts (not including 0) of a lubricant and 0 to 3 parts (not including 0) of a stabilizer. The polypropylene material provided by the invention takes the polypropylene resin as a base material and takes the magnesium hydroxide crystal whiskers as a modifying agent; under specific technological conditions, the base material, the modifying agent and additives are mixed to prepare the polypropylene material modified by the magnesium hydroxide crystal whiskers; compared with a composite material prepared from common magnesium hydroxide and polypropylene, the breaking strength and elongation at break of the material are remarkably improved, and the flame retardant property of the material is better than that of the composite material prepared from the common magnesium hydroxide and the polypropylene.

Description

technical field [0001] The invention belongs to the application of composite materials, and relates to a polypropylene material and a preparation method thereof, in particular to a magnesium hydroxide whisker-modified polypropylene material and a preparation method thereof. Background technique [0002] Polypropylene (PP) is one of the five general-purpose plastics. It has many excellent properties, such as high melting point (167°C), heat resistance, products can be sterilized by steam, and a density of 0.90g / cm 3 It is the lightest general-purpose plastic; its corrosion resistance, strength, rigidity and transparency are better than polyethylene. Due to its low production cost and good comprehensive mechanical properties, polypropylene is widely used in the fields of chemical industry, chemical fiber, construction, light industry and packaging. However, the oxygen index of polypropylene is between 16 and 19, the melting zone is narrow, and molten droplets are produced in ...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08K13/04C08K7/08C08K5/09C08K5/098B29C47/92B29C43/58B29C48/92
CPCC08K13/04B29C43/58B29C48/92B29C2043/5808B29C2043/5816B29C2948/92704C08K5/09C08K5/098C08K7/08C08K2201/003C08K2201/006C08K2201/016C08L2201/02C08L23/12
Inventor 范魏魏范伟伟罗顺
Owner JIANGSU DASHENG POLYMER
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