Extrudable cementatious material

A technology of cementitious materials and materials, applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve problems such as limitations, achieve the effect of improving extrusion performance and reducing costs

Inactive Publication Date: 2002-10-23
JAMES HARDIE INT FINANCE BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this phenomenon may be useful in some applications, it is limiting in others

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A composition was prepared according to the materials and proportions shown in Table 1, the solids components were mixed in a high speed Eirich mixer and then kneaded with water in a Hobart mixer. The resulting paste was then extruded into 50 mm wide and 10 mm thick plates using a Handle laboratory extruder with a 75 mm extrusion barrel. For each tackifier, experiments were repeated with different additive amounts to determine the minimum amount required for good extrusion, surface finish, and shape retention. Table 2 details the tackifiers and dispersants tested with respect to their origin, chemical composition and cost. Table 3 lists the addition amount of tackifier and the combination of tackifier and dispersant with the same performance in the extrusion molding process, and can compare the effect of dispersant.

[0056] material

[0057] Types of

[0058] Requirements without DA1

Embodiment 2

[0060] A composition was prepared according to the materials and proportions shown in Table 4, the solids components were mixed in a high speed Eirich mixer and then mixed with the water / VEA solution in a Hobart mixer. The resulting paste was then extruded into 50 mm wide and 10 mm thick plates using a Handle laboratory extruder with a 75 mm extrusion barrel. For each tackifier, experiments were repeated with different additive amounts to determine the minimum amount required for good extrusion, surface finish, and shape retention. Table 6 represents the amount of tackifier required for using the new invention and without the new invention

[0061] material

[0062] Requirements without DA1

Embodiment 3

[0064] Two compositions were prepared according to the materials and ratios shown in Table 6, one containing VEA3 (Mixture 1) and the other containing VEA4 / DA1 (Mixture 2). VEA3 is a high grade HPMC and VEA4 is an inexpensive HEC compound. For each composition, all of its solid ingredients were mixed in a high speed Eirich mixer. The dry solids were then mixed with water in a Hobart mixer until a homogeneous mass was formed. The resulting paste was then extruded into 50 mm wide and 10 mm thick plates using a Handle laboratory extruder with a 75 mm extrusion barrel. Half of the samples were precured for 8 hours at ambient conditions and the other half were precured for 36 hours at ambient conditions. The tapes were then autoclaved at a saturated vapor pressure of 177°C for 8 hours to cure. The mechanical properties of the two compositions were tested and Figure 1 shows the results. It can be seen that there are no significant differences in the measured mechanical propertie...

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Abstract

A method and treatment agent for treating gelled material for extrusion, comprising adding a tackifier and a dispersant in an amount sufficient to enhance the effect of the tackifier to the gelled material. By increasing the effectiveness of the tackifier, extrudability can be maintained with less tackifier or lower grade (cheaper) tackifier than conventionally used, or for the same amount of tackifier as compared to conventional agent to improve extrusion performance.

Description

technical field [0001] The present invention relates to building products, in particular fiber reinforced cement building products. Background of the invention [0002] Fiber-reinforced cementitious material panels and other fiber-reinforced products are widely used as walls, ceilings, roofs, floors, etc. of buildings and in place of wooden door and window veneers, frames, and the like. [0003] There are many methods of forming and shaping such FRC products, including Hatschek plate making, Mazza pipe making, Magnani plate making, injection molding, hand laying method, casting method, filter press method, roll forming method, etc. [0004] Extrusion of fibrous cementitious articles has been done on a limited basis, but it has had some difficulties that reduce its commercial viability. During extrusion, a cementitious slurry or slurry is forced through a die, which may be subjected to relatively high pressures. For this it is important that the slurry or sludge has good f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B3/20C04B22/06C04B24/22C04B24/26C04B24/30C04B28/00C04B28/02C04B24/38
CPCC04B28/02C04B2111/00129C04B2103/408C04B2103/44C04B24/223C04B24/383C04B24/226C04B24/2641C04B14/10C04B24/32C04B24/38
Inventor P·C·古德温B·D·波特N·S·格林治江崇军
Owner JAMES HARDIE INT FINANCE BV
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