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Fiber cement composition materials using cellulose fibers loaded with inorganic and/or organic substances

A cellulose fiber and fiber cement technology, used in fiber raw material processing, building materials, plant fibers, etc., can solve problems such as reducing freeze-thaw cycle resistance, increasing the rate and amount of water absorption into products, and improving mechanical and physical properties. properties, improved mechanical properties and usability, effect of high water absorption

Inactive Publication Date: 2004-02-04
JAMES HARDIE INT FINANCE BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem with this technology is that when wet it increases the rate and amount of water absorbed into the product and reduces resistance to freeze-thaw cycles

Method used

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  • Fiber cement composition materials using cellulose fibers loaded with inorganic and/or organic substances
  • Fiber cement composition materials using cellulose fibers loaded with inorganic and/or organic substances
  • Fiber cement composition materials using cellulose fibers loaded with inorganic and/or organic substances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] Unbleached kraft softwood pulp was pre-polished to 500 CSF before the treated and ground pulp was used in the sizing process. The sized fibers were prepared by treating the lapped fibers with an alkylsiloxane (ChemRex Enviroseal 100) at a pulp consistency of 4% for one hour. The dosage of sizing agent is 10% of the fiber mass, while the reaction temperature under atmospheric pressure is ambient temperature. Samples of fiber cement composites were formed using laboratory equipment. Samples A and B of the following examples, as well as C, D, E, F and G, had the same formulation of: 8% fiber (treated / sized fiber or generally untreated fiber), 35% % Portland cement and 57% ground silica. The samples were air cured at ambient temperature for 8 hours, followed by hot pressing at 180°C for 12 hours. The physical and mechanical properties of samples A and B are shown in Table 2.

[0168] physical properties

sample

A

B (control)

MOR(MPa) ...

Embodiment 2

[0174] Figure 5 Interpret the results of the water permeability test. Sample D was a control incorporating conventional unsized cellulose fibers, while sample C was prepared with a formulation containing treated cellulose fibers in a dosage of 5% acrylic latex (Valspar EPS2118) based on the fiber mass deal with. The sizing reaction was carried out at ambient temperature for 30 minutes. Samples C and D have an oven-dried density of about 1.3 grams per cubic centimeter.

[0175] The water permeability test involves attaching a tube to the sample material surface such that one end of the tube is configured adjacent to the material sample surface. The tube is made of acrylic material, about 125mm long and about 50mm internal diameter. After preconditioning the sample to 23±2°C and relative humidity equilibrated to 50±5%, the tube was filled with water while periodically recording the water level inside the tube. The drop in water level in the recording tube is recorded as wa...

Embodiment 3

[0179] Freeze-thaw resistance refers to the ability of a material to resist damage due to water and temperature effects when the material is exposed to repeated cycles of freezing and thawing. For concrete cementitious materials, the damage usually begins with exfoliation of the surface, and then gradually expands to the inside. Sometimes deep cracks may occur. Freezing-related damage usually does not occur unless a sufficient amount of water is stored in the cavity. It is known that freeze-thaw damage in concrete can be minimized when the concrete material has a low water to cement ratio and low permeability.

[0180] An advantage of the preferred embodiments is that the final product has improved freeze-thaw resistance, as shown in Figure 6 . Sample E contained cellulose fibers that were typically unsized and Sample F contained fibers that had been treated / sized with an emulsified silicone oil containing a number of compounds including n-octyltriethoxysilane, n-octyltrim...

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Abstract

This invention discloses a new technology related to cellulose fiber reinforced cement composite materials using cellulose fibers that are treated with inorganic and / or organic resins to make the fibers more hydrophobic, as well as other chemical treatments. This invention discloses four aspects of the technology: fiber treatment, formulations, methods and the final product. This technology advantageously provides fiber cement building materials with the desirable characteristics of reduced water absorption, reduced rate of water absorption, lower water migration, and lower water permeability. This invention also impart the final products improved freeze-thaw resistance, reduced efflorescence, and improved rot and UV resistances, compared to conventional fiber cement products. These improved attributes are gained without loss in dimensional stability, strength, strain or toughness. In some cases the physical and mechanical properties are improved. This invention also discloses the method of treating cellulose fibers with various chemicals to impart the fiber hydrophobicity for applications in the fiber reinforced cement composite materials.

Description

Technical field: [0001] This invention relates to the chemical treatment of cellulose fibers to render the fibers more hydrophobic and / or durable. More specifically, the present invention relates to cellulose fiber reinforced cementitious composites using sized cellulose fibers, including fiber treatment methods, formulations, manufacturing methods and end products with improved relative material properties relative to the same product. Background technique: [0002] In general, Portland cement is the basic raw material for many products such as buildings and structures, primary concrete and reinforced concrete. Compared to plaster, wood, particle board, fiberboard and other common materials used in building products, cement has a number of advantages such as being a hydraulically settable binder and being less affected by water after setting. That's not to say water won't affect cement. Some of the chemical components do dissolve when the cement is saturated with fresh wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C2/04C04B16/02C04B18/24C04B20/10C04B28/02C04B40/02C04B111/27D06M11/57D06M13/00D06M13/07D06M13/13D06M13/192D06M13/507D06M13/513D06M15/01D06M15/11D06M15/15D06M15/227D06M15/263D06M15/55D06M15/693D06M23/06D06M101/06D21H17/13D21H17/59D21H21/16
CPCC04B20/1051C04B28/02C04B20/107C04B2111/27D21H17/13C04B18/24C04B2111/2038C04B18/241C04B2103/65D21H17/59D21H21/16Y02W30/91C04B20/1022C04B20/1029C04B14/06C04B20/002C04B20/0052C04B40/02C04B40/024C04B16/06C04B14/043C04B14/062C04B14/08C04B14/106C04B14/16C04B14/185C04B14/20C04B14/204C04B14/28C04B14/303C04B16/08C04B18/08C04B18/101C04B18/141C04B18/146C04B22/04C04B22/06C04B24/26C04B24/42C04B2103/30C04B2103/408C04B2103/44C04B2103/54C04B2103/63
Inventor D·J·默克莱伊C·罗
Owner JAMES HARDIE INT FINANCE BV
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