Unlock instant, AI-driven research and patent intelligence for your innovation.

Composite powder of wollastonite and spherical sio2 and its application

A composite powder and wollastonite technology, applied in the field of inorganic non-metallic powder, can solve the problems of rising viscosity of the mixture, failing to achieve toughening and strengthening, affecting the use effect, etc. The effect of viscosity

Active Publication Date: 2018-03-23
ZHEJIANG HUAFEI ELECTRONICS BASE MATERIAL
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a filler, although it can be added to thermosetting resin or thermoplastic polymer to strengthen and improve the modulus, it will often be entangled with each other when added to the resin. Effect

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composite powder of wollastonite and spherical sio2 and its application
  • Composite powder of wollastonite and spherical sio2 and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The acicular wollastonite and spherical silica were mixed according to Table 1, and the comparative examples and the samples of each embodiment were obtained without silane coupling agent treatment. Each sample was mixed with liquid epoxy resin at 40% (mass percentage) and then degassed to measure its viscosity. The viscosity of the liquid mixture is related to the shear rate. The viscosity of 100% untreated wollastonite is very high at low shear and decreases with the increase of shear rate. For potting applications, low viscosity is preferred under low shear conditions for uniform filling and no porosity. In this example, no spherical SiO was added 2 The relative viscosity of wollastonite is 100 as a benchmark, and the addition amount of resin is fixed at 60% (mass), and the spherical SiO with 2% mass fraction 2 With or without the addition of a coupling agent, the relative viscosity drops to 25-37, that is, a drop of 15-63%.

[0018] Table 1

[0019]

[0020] ...

Embodiment 2

[0025] Mix acicular (or fibrous) wollastonite and spherical silica according to Table 2. The present invention is that embodiment 11-18 is 30%-27% wollastonite and spherical SiO by adding mass percent 2 After pre-mixing with polyethylene, heat and mix it with an extruder to obtain a polyethylene mixture. The present invention evaluates the powders of the examples with the plastic melt flow rate. Melt mass flow rate (Melt mass-flow rate, MFR for short) refers to the number of grams of melt that flows out of resin melt through a standard capillary tube within 10 minutes at a certain temperature and pressure in a standard melt indexer. Based on the MFR (thermoplastic melt flow rate) at 190° C. of 100% untreated wollastonite, the relative MFR of each embodiment was measured according to the following formula and listed in Table 2. Relative MFR=(MFR of the examples) / (MFR of 100% mixture of untreated wollastonite and polyethylene). It can be clearly seen from the results in Table...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
aspect ratioaaaaaaaaaa
Login to View More

Abstract

The invention relates to a composite powder of wollastonite and spherical SiO2 and its application, which is characterized in that the mass percentage content of the spherical SiO2 is 1-10, and the balance is wollastonite. The aspect ratio of the wollastonite is ≥5˜15, and the average particle size of spherical SiO2 is 0.1 μm˜10 μm. It is used in thermosetting resins or thermoplastic polymers to reduce their relative viscosity or increase the relative flow rate of thermoplastic melts; the thermosetting resin is a thermosetting resin composition represented by epoxy resin; the thermoplastic high The polymer is a thermoplastic polymer represented by a free radical polymerized polymer. The composite powder described above may need to be treated with one or more silane coupling agents. Using the composite powder provided by the present invention not only effectively overcomes the defect of entanglement added by a single wollastonite, but also can improve the MFR and / or reduce the relative viscosity.

Description

technical field [0001] The invention relates to a wollastonite and spherical SiO 2 The composite powder and its application belong to the field of inorganic non-metallic powder. Background technique [0002] Wollastonite is a chain silicate mineral with the chemical formula Ca 3 [SiO 3 o 9 ], belonging to the trigonal crystal system, is a fibrous aggregate with a Mohs hardness of 4.5-5.5 and a density of 2.75-3.10. It is a new type of insulating material and can be used as a substitute for asbestos. As a filler, although it can be added to thermosetting resin or thermoplastic polymer to strengthen and improve the modulus, it will often be entangled with each other when added to the resin. Effect. [0003] Considering spherical SiO 2 It has been widely used in the plastic packaging industry and has become an important material for plastic packaging compounds. Especially spherical SiO 2 It is already a high-end filler in plastic molding compound. According to reports,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/06C08K7/10C08K7/18C08L63/00C08L23/06
Inventor 李文
Owner ZHEJIANG HUAFEI ELECTRONICS BASE MATERIAL