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PPR/SiO2 nano composite material and preparation method thereof

A nanocomposite material and nanotechnology, applied in the field of PPR/SiO2 nanocomposite material and its preparation, can solve the problem that the organic combination of inorganic nanophase and PPR properties cannot be well realized, the structure of inorganic nanophase is unstable, and the difficulty of manufacturing process is increased. and other problems, to achieve the effect of solving distortion, improving crystallinity and mechanical properties, and improving processability

Inactive Publication Date: 2009-05-06
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain the effect of highly dispersed inorganic nanoparticles, it is usually necessary to use two melt blending, the first time to prepare the masterbatch, and the second time to melt blend, which makes the manufacturing process more difficult and the cost of raw materials increases
In addition, melt blending still has problems such as unstable inorganic nanophase structure and difficult dispersion, so the organic combination of inorganic nanophase and PPR properties cannot be well realized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation of embodiment 1 PPR

[0054] 1. Catalyst prepolymerization

[0055] A dry 250ml three-necked flask was heated and vacuumed for 2 hours, further dried and deaired, cooled to room temperature and replaced with purified nitrogen for 3 times, filled with nitrogen to a certain positive pressure, and added 100ml of n-heptane solvent, according to the molar ratio Al / Ti =2:1, add AlEt 3 , the main catalyst is 0.420g; the reaction propylene gas pressure is controlled to be less than 0.5atm, propylene is fed into at room temperature, stirring is started, and a prepolymerization reaction is carried out to obtain a prepolymerization catalyst.

[0056] Constantly adjust the inlet valve to adjust the pressure of propylene, and pre-polymerize for 4 hours.

[0057] 2. Preparation of PPR

[0058] First feed ethylene into the propylene metering tank, and the gas molar ratio of ethylene to propylene is 3:100 to obtain ethylene / propylene mixed gas;

[0059] Heat and vac...

Embodiment 2

[0060] Example 2 PPR / SiO 2 Nanocomposite

[0061] 1. Nano SiO 2 surface treatment

[0062] 2.5g nano-SiO 2 Put it into a single-necked flask, add 20.0ml of absolute ethanol as a dispersant, add 30.0ml of silane coupling agent and connect it to a reflux condenser, reflux for 4 hours under a nitrogen atmosphere, and then filter and drain under nitrogen protection.

[0063] 2. Prepolymerization of catalyst

[0064] A dry 250ml three-necked flask was heated and evacuated for 2 hours, further dried and deaired, cooled to room temperature and replaced with purified nitrogen for 3 times, filled with nitrogen to a certain positive pressure, and added 100ml of n-heptane solvent, according to the appropriate Al / Ti = 60, add 0.22mlAlEt 3 , adding 0.6g treated nano-SiO 2 and 0.070g of the main catalyst. The reaction propylene gas pressure is controlled to be less than 0.5 atm, propylene is introduced at normal temperature, stirring is started, and a prepolymerization reaction is ca...

Embodiment 3

[0070] Example 3 PPR / SiO 2 Nanocomposite

[0071] 1. Nano SiO 2 surface treatment

[0072] 5.37g nano-SiO 2 Put it into a single-necked flask, add 20.0ml of absolute ethanol as a dispersant, add 40.0ml of silane coupling agent and connect it to a reflux condenser, reflux for 5 hours under a nitrogen atmosphere, and then filter and drain under nitrogen protection.

[0073] 2. Prepolymerization of catalyst

[0074] A dry 250ml three-necked flask was heated and evacuated for 2 hours, further dried and deaired, cooled to room temperature and replaced with purified nitrogen for 3 times, filled with nitrogen to a certain positive pressure, and added 100ml of n-heptane solvent, according to 0.16mol AlEt 3 Process 0.6g nano-SiO 2 The treatment capacity, molar ratio Al / Ti=10:1, add 1.5ml AlEt 3 , then add the above-mentioned surface-treated nano-SiO 2 Add 5.37g and 0.642g of the main catalyst, add n-heptane to form a 200ml suspension; control the reaction propylene gas pressure ...

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Abstract

The invention discloses a PPR / SiO2 nanocomposite material and a preparation method thereof. The composite nanophase material is prepared by 95 to 100 portions of PPR substrates and 0.5 to 4 portions of nano SiO2. The preparation method adopts high-efficiency supported Ziegler-Natta catalyst, uniformly disperses SiO2 nano-particles into the PPR substrates during the process of propylene / ethylene copolymerization, and performs in situ composition to prepare the PPR / SiO2 nanocomposite material. The SiO2 nano-particles are uniformly dispersed into the PPR substrates, so that organic combination of the rigidity, the dimensional stability, the thermal stability and the toughness of the inorganic nano-particles and the toughness and the processability of polymers is well realized, and the low temperature resistance, the processability, the strength, the modulus, the heat resistance and the dynamic resistance of the PPR special composite are improved; and the preparation method can be applied to industrial production of the PPR / SiO2 nanocomposite material.

Description

technical field [0001] The invention belongs to the technical field of polypropylene nanocomposite materials, in particular to a PPR / SiO 2 Nanocomposites and methods for their preparation. Background technique [0002] Through propylene / ethylene coordination copolymerization, polyethylene sequences are randomly introduced into the molecular chain of isotactic polypropylene, and the mass content of ethylene units is controlled below 10%, so as to obtain PPR. This kind of material is non-toxic, light in weight, corrosion-resistant, and has good properties of low-temperature impact resistance, long-term heat-resistant and pressure-resistant, and low-temperature environmental stress crack resistance. , Hot water pipes are very good raw materials. [0003] The temperature resistance range of PPR pipe is -15℃~90℃, and the instantaneous temperature resistance can reach 120℃. It has good pressure resistance and acid and alkali resistance. It has been widely used in the world. 2 / 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08K9/06C08F210/16C08F2/44
CPCY02P20/582
Inventor 伍青祝方明柯灯明张玲高海洋李志云刘冉
Owner SUN YAT SEN UNIV
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