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Method for preparing high fluidity carbon black masterbatch by in situ degradation of polypropylene with peroxide

A fluid carbon black and peroxide technology, applied in the field of carbon black masterbatch and its preparation, can solve the problems of low flow rate, difficult dispersion, complicated preparation process and high production cost, and achieves good dispersibility and simple preparation process. , the effect of low cost

Active Publication Date: 2021-07-27
NANJING TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has certain shortcomings. For example, the melt extrusion-degradation method is first used to prepare the matrix resin with a melt flow rate of 1500-2000g / 10min. The granular resin obtained by this production process is not suitable for blending with carbon black to directly prepare color Masterbatch, but powdered resin needs to be made through a special mill before it can be used to prepare carbon black masterbatch
The preparation process is relatively complicated, and there are still disadvantages such as large energy consumption and high production cost
[0007] To sum up, in the process of preparing special masterbatches for non-woven fabrics and melt-blown fabrics, the products prepared by the existing technology have certain limitations, mainly color masterbatches, especially high carbon black content masterbatches The melt flow rate is low, it is difficult to disperse in the matrix resin (MFR=1500~2000g / 10min) for melt blown cloth, or there are disadvantages such as relatively complicated preparation process, large energy consumption and high production cost

Method used

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  • Method for preparing high fluidity carbon black masterbatch by in situ degradation of polypropylene with peroxide
  • Method for preparing high fluidity carbon black masterbatch by in situ degradation of polypropylene with peroxide
  • Method for preparing high fluidity carbon black masterbatch by in situ degradation of polypropylene with peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Raw material formula (mass ratio, part):

[0038] Homopolypropylene powder (load 2160g, MFR=400g / 10min at 230°C) 35,2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane 0.35, high structure carbon Black (15nm, specific surface area 100m 2 / g, oil absorption value 105mL / g, tinting strength 100) 60, binary liquid ethylene propylene rubber (number average molecular weight 35000) 3, liquid paraffin oil (100 ℃ kinematic viscosity 6 ~ 12mm 2 / s) 1~2, antioxidant B215 0.3.

[0039] Preparation Process:

[0040] High-speed mixing of powdered homopolypropylene resin and organic peroxide: in a high-speed mixer, stir the powdered homopolypropylene resin and organic peroxide in the formula raw materials at room temperature at a low speed of 500 rpm or less for 2 minutes and discharge to main silo.

[0041] Double-rotor continuous mixer blending: the integrated feeding system is turned on to transport the powdered homopolypropylene resin, organic peroxide mixture, and high-structure car...

Embodiment 2

[0046] Raw material formula (mass ratio, part):

[0047] Homopolypropylene powder (load 2160g, MFR=400g / 10min at 230°C) 50,2,5-Dimethyl-2,5-bis(t-butylperoxy)hexane 0.2,3,6, 9-triethyl-3,6,9-trimethyl-1,4,7-triperoxynonane 0.2, high structure carbon black (20nm, specific surface area 120m 2 / g, oil absorption value 125mL / g, tinting strength 105)50, ternary liquid ethylene propylene rubber (number average molecular weight is 40000)3, liquid paraffin oil (kinematic viscosity at 100°C is 10mm 2 / s) 1, antioxidant B225 0.5.

[0048] Preparation Process:

[0049] High-speed mixing of powdered homopolypropylene resin and organic peroxide: in a high-speed mixer, stir the powdered homopolypropylene resin and organic peroxide in the formula raw materials at room temperature at a low speed of 500 rpm or less for 2 minutes and discharge to main silo.

[0050] Double-rotor continuous mixer blending: the integrated feeding system is turned on to transport the powdered homopolypropylene...

Embodiment 3

[0055] Raw material formula (mass ratio, part):

[0056] Homopolypropylene powder (load 2160g, MFR=200g / 10min at 230°C) 40,2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane 0.2,3,6, 9-triethyl-3,6,9-trimethyl-1,4,7-triperoxynonane 0.2, di-tert-butyl peroxide 0.15, high structure carbon black (15nm, specific surface area 120m 2 / g, oil absorption value 110mL / g, tinting strength 105) 50, binary liquid ethylene propylene rubber (number average molecular weight 50000) 5, liquid paraffin oil (kinematic viscosity at 100°C is 12mm) 2 / s) 2, antioxidant B215 0.3, B225 0.3.

[0057] Preparation Process:

[0058] High-speed mixing of powdered homopolypropylene resin and organic peroxide: in a high-speed mixer, stir the powdered homopolypropylene resin and organic peroxide in the formula raw materials at room temperature at a low speed of 500 rpm or less for 2 minutes and discharge to main silo.

[0059] Double-rotor continuous mixer blending: the integrated feeding system is turned on to...

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Abstract

The invention discloses a method for preparing high-fluidity carbon black masterbatch by degrading polypropylene in situ with peroxide. The prepared high-fluidity masterbatch still has a high melt content when the carbon black mass content is as high as 50-60%. Flow rate, easy to disperse in low-viscosity polypropylene melt, especially suitable for the production needs of special products such as polypropylene melt-blown cloth and fiber. The method includes the following steps: uniformly mix the polypropylene resin and organic peroxide in the formula raw materials in a high-speed mixer; continuously and directly put the polypropylene resin, organic peroxide mixture and high-structure carbon black into the double Blending is carried out in a rotor continuous mixer; a single-screw extruder with a high aspect ratio is selected, and the high-fluidity PP / carbon black mixture and antioxidant are first added to the hopper of the single-screw extruder; then The mixture of liquid paraffin oil and liquid ethylene-propylene rubber is added to the middle section of the single-screw extruder and further mixed evenly; finally, the high-fluidity carbon black masterbatch is obtained by granulation.

Description

technical field [0001] The present invention relates to a kind of carbon black masterbatch and preparation method thereof, more specifically relate to a kind of peroxide in situ degradation polypropylene and prepare the method for high fluidity carbon black masterbatch. Background technique [0002] Among the protective masks, the "flat mask" with three-layer non-woven structure is the most common. The core technical component of this mask is the middle core layer-the filter layer, which is a special structure of melt-blown cloth. This kind of melt-blown fabric mainly uses polypropylene with high melt flow rate (MFR) as the main raw material to prepare non-woven fabrics with fiber diameters of 1-5 μm. This non-woven fabric with a special structure has many voids, fluffy structure, It has the characteristics of good anti-wrinkle ability, and at the same time, the microfiber with unique capillary structure increases the number and surface area of ​​fibers per unit area, so tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/22C08L23/12C08L23/16C08L91/06C08K3/04C08K5/134C08K5/526C08F8/50C08F110/06B29B9/06
CPCB29B9/065C08F8/50C08J3/226C08J2423/12C08J2423/16C08J2491/06C08K3/04C08K5/1345C08K5/526C08F110/06
Inventor 毛泽鹏张晗陈婷婷张军苏克顺周子晨杨念新杨气鹏高玉巧宋金萍杨正花戴庆
Owner NANJING TECH UNIV
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