Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Use of vegetative material as a filler in composite materials

a composite material and vegetative material technology, applied in wood treatment, wood treatment details, manufacturing tools, etc., can solve the problems of reducing conductivity, material processing difficulties, and high cost of known conductive fillers such as carbon black, aluminium, stainless steel and carbon fibres, etc., to achieve long cure time, reduce the effect of toxicity

Inactive Publication Date: 2005-07-28
CONTRACT RES & DEV M +1
View PDF9 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention relates to the use of carbonised vegetative-based filler to improve antistatic, flame retardant, accelerator, plasticizer, blowing and other physical or mechanical characteristics in composite materials. The carbonised vegetative-based filler, such as carbonised rice husk, is burnt at a high temperature for a short time to achieve improved properties. The invention also exhibits the use of fresh and carbonised rice as an accelerator when used in combination with recycled or virgin natural rubber, and makes ebonite a conductive product when carbonised rice husk is used. The invention also discusses the use of common inorganic fillers and carbon black in ebonite and their effects on the properties of the material."

Problems solved by technology

The presence of appreciable quantities of oxygen on the surface (called volatile content) acts as insulation and hence reduces conductivity.
The known conductive fillers such as carbon black, aluminium, stainless steel and carbon fibres are expensive and furthermore some of these materials have other processing difficulties, eg. aluminium fibres and stainless steel fibres settle in liquid environments due to their high density.
Further problems with known conductive fillers are that they often compromise other properties of composite plastics such as flame retardance and strength.
Static electrification of articles can lead to a number of undesirable effects including: Attraction of dust particles.
Risk of fire or explosion caused by sparking near inflammable liquids, gases, and explosive dusts, e.g. coal dust and flour.
Risk of shock to persons handling equipment.
For light coloured products certain grades of aluminium silicate may be used as antistatic fillers although these are usually less effective in reducing resistance than the super conductive furnace.
There are also other proprietary antistatic agents that are available, such as ethylene oxide, but still these agents are less effective then the super conductive furnace.
The presence of appreciable quantities of oxygen on the surface of carbonised rice husk acts as insulation for each aggregate, thereby reducing the conductivity and also reducing the flammability.

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

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0066] All chemicals used are taken by percentage of weight of rubber. The rubber and the chemicals are mixed in a Banbury, for 5 minutes. Recycled rubber (reclaim) (220 g) is first milled with zinc oxide (4.5%)—accelerator, which is followed with stearic acid (1.8%)—activator, Mercadibenzothiazole disulphide (MBTS)(0.5%), Tetramethylthiuram disulphide (TMTD)(0.2%)—accelerator, fresh rice husk (27%)—blowing agent and filler and sulphur (2.7%)—vulcanisate. Then the mixed compound is milled for five (5) minutes to form a sheet that is ready for curing. Then a piece of the sheet weighing about 32 g is placed in a mould that it is to be cured for two (2) minutes in a oven at 150° C. temperature. The conventional curing time is six (6) minutes at the same temperature of 150° C.

[0067] The rubber and the chemicals are mixed in a Banbury, for 5 minutes. The similar approach has been done for using SBR Rubber (100 g), silica (62 g), Peg 1500 (2.5 g), Paraffin oil (5 g), Zinc oxide (2.5 g), ...

example 3

[0071] All chemicals used are taken by percentage of weight of rubber. The rubber and the chemicals are mixed in a Banbury, for six (6) minutes. The recycle (devulcanised) rubber is first milled with magnesium oxide (2%)—accelerator, which is followed with Diphenylguanidine (2%)—accelerator, fresh rice husk (30%)—accelerator and filler and sulphur (30%)—vulcanisate. After the milling at the Banbury for ten (10) minutes, it is then milled into a sheet. The mould was heated in the oven press to 150° C. then the sheeted rubber is placed in the mould and it is cured for twelve (12) minutes. The conventional curing time is between eight to ten hours at the same temperature of 150° C.

[0072] A conventional formula for ebonite was selected to compare. The rubber and the chemicals are mixed in a Banbury, for 5 minutes. The similar mixing as above was followed, using SBR 5 Rubber (100 g), ebonite dust (100 g), China clay (50 g), Magnesium oxide (5 g), Diphenylguanidine (3 g), Linseed oil (5 ...

example 4

[0076] All chemicals used are taken by percentage of weight of natural rubber (NR). The natural rubber and the chemicals are mixed in an open mill or kinder, for six (6) minutes. Natural rubber is first milled with stearic acid (1%) and zinc oxide (5%) activator, which is followed with rice husk (blowing agent) (2.5-3.5%), calcium carbonate—(40%), promoter—urea based (2.5-3.5%), silica (10%), accelerator dibenzthiazyldisulphide (MBTS) (0.05%) and catalyst sulphur (1.5%). After the milling at the open mill or kinder for ten (10) minutes, it is then milled into a sheet. The mould was heated in the oven press to 160° C. then the sheeted natural rubber is placed in the mould and it is cured for twenty-two (22) minutes.

[0077] The temperature for curing could be from 145°-160° C. and the cure time may differ according to the mould size.

[0078] Cured Properties; Rice Husk Filled Blowed Mix—Micro-Cellular Cells.

1.HardnessAskar C352.Shrinkage% 53.Specific Gravityg / cc0.3-0.35

[0079] By usin...

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
inter-particle distanceaaaaaaaaaa
decomposition temperatureaaaaaaaaaa
temperaturesaaaaaaaaaa
Login to View More

Abstract

The present invention provides a filler for use in composite materials wherein said filler comprises a vegetative-based material and wherein said vegetative-based material can be fresh or carbonised. In one particularly preferred embodiment the present invention utilises carbonised rice husk. In a further aspect of the present invention there is provided a process for the production of a carbonised vegetative-based filler wherein said process comprises burning a fresh vegetative-based material at about 800° C. for about 4 seconds.

Description

RELATED APPLICATIONS [0001] This application is a continuation application of U.S. application Ser. No. 09 / 889,610, entitled “Use of Vegetative Material as a Filler in Composite Materials”, filed Jan. 8, 2002, which is a continuation application of PCT / AU00 / 00018, filed Jan. 17, 2000 which published as WO 00 / 42116, which claims priority to AU PP 8198 filed Jan. 18, 1999, all of which are incorporated herein by reference in their entirety.TECHNICAL FIELD [0002] This invention relates to the use of a filler derived from cereal husk, more particularly rice husk, in composite materials to enhance the flame retardant, antistatic, accelerator, plasticiser and blowing characteristics in various composite materials. The invention has particular but not exclusive application to the following families of composites: [0003] 1. Thermoplastic Resins [0004] 2. Thermoset Plastics [0005] 3. Rubbers and Elastomeric Materials [0006] 4. Conductive Coatings and Printing Inks [0007] 5. Bitumen [0008] 6....

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 Applications(United States)
IPC IPC(8): C08L97/02C08L101/00
CPCC04B35/62213C08L97/02C08L101/00C08L2666/02C08L2666/26
Inventor SIVASITHAMBARAM PILLAI, MAILVAGANAM THAVALINGAMAHMAD, KHALID HAJIARUNASALAM, ARULGNANAM VETTIVALOO
Owner CONTRACT RES & DEV M
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com