Plasterboard composition, preparation of this composition and manufacture of plasterboards

a technology of plasterboard and composition, which is applied in the field of plasterboard composition, can solve the problems of high cost, high temperature shrinkage, and difficult dispersion of silicon and aluminium oxide in dry powder form, and achieves the effects of improving fire resistance, reducing production costs, and improving fire resistan

Inactive Publication Date: 2003-07-24
LAFARGE PALTRES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In that patent, it is specified that silicon and aluminium oxides, in dry powder form, are difficult to disperse and also expensive.
The plasterboard according to that patent has a high-temperature shrinkage, which is quite low, but its fire resistance is limited.
Such a board therefore does not have the properties needed to constitute good fire protection.

Method used

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  • Plasterboard composition, preparation of this composition and manufacture of plasterboards
  • Plasterboard composition, preparation of this composition and manufacture of plasterboards
  • Plasterboard composition, preparation of this composition and manufacture of plasterboards

Examples

Experimental program
Comparison scheme
Effect test

example 2

[0112] The hot mechanical strength (also called the high-temperature core cohesion) of the control board and boards A, B, C and D prepared in Example 1 were measured.

[0113] The test used combined a thermal stress, exerted on both sides of the test sample by means of a Mecker burner delivering a flame having a constant temperature of 1020.degree. C., with a tensile mechanical stress of 0.2 kg / cm.sup.2.

[0114] The parameters recorded were the failure time and the final shrinkage.

[0115] The results are given in the following table:

2 Board Control A B C D Failure time (min) >100 >120 >120 109 93.5 Shrinkage (%) 4.4 2.1 2.95 1.5 1.3

[0116] It may be seen that failure of the control, A and B test specimens was reached after two hours of stressing. Moreover, all the formulations lasted at least 1 hour 30 minutes.

[0117] In the case of all the plasterboard test specimens according to the invention, it may be seen that the combination of micronized unexpanded vermiculite combined with clay allo...

example 3

[0119] The shrinkage behaviour of the control board and boards A, B, C and D prepared in Example 1 was measured.

[0120] The test involved consisted in simply exerting the same thermal stress as in Example 2, in the absence of any mechanical stress.

[0121] The recorded parameter was the shrinkage after 15, 30, 45 and 60 minutes.

[0122] The results are given in the following table:

3 Shrinkage of the boards in % Time (min) Control A B C D 15 3.0 1.3 1.4 0.3 0.9 30 3.0 1.4 1.1 0.5 1.2 45 3.2 1.6 1.7 0.8 1.1 60 3.6 1.5 2.5 1.2 0.7

[0123] FIG. 1 shows the variation in the shrinkage as a function of time for the control board and boards A and B.

[0124] FIG. 2 shows the change in shrinkage as a function of time for the control board and boards B, C and D, during another test.

[0125] The difference between the control and the test specimens according to the invention is very marked, particularly in the initial phase (up to 30 minutes. The micronized unexpanded vermiculite / clay pair reduces the shr...

example 4

[0127] The heat transfer of the control board and boards A, B, C and D prepared in Example 1 was measured.

[0128] The test consisted in exerting a thermal stress on one side of the by means of a Mecker burner delivering a flame with a constant temperature of 1020.degree. C.

[0129] The parameters recorded were the temperature of the unexposed test specimen, the time to reach values corresponding to the Fire Wall and insulation classification criterion according to the French Decree of August 1999 and the EN 1361-1 and EN 13 501-2 standards, in which dt=140.degree. C. on average or a maximum of 180.degree. C. at any point.

[0130] In addition, the time to reach a temperature of 400.degree. C. was also recorded, as this time is a significant measure of the heat transfer after dehydration.

[0131] The results are given in the following table:

4 Time(s) to reach temperature Boards Temperature Control A B C D 160.degree. C. 595 525 655 640 570 200.degree. C. 645 615 710 690 635 400.degree. C. 94...

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Abstract

A plasterboard composition includes from 55 to 92% of hydratable calcium sulphate; from 0.1 to 5% of mineral and/or refractory fibres; from 3 to 25% of a mineral additive; from 1 to 5% of unexpanded vermiculite; and from 3 to 15% of hydrated alumina.

Description

[0001] The present application is a continuation of PCT International Application No. PCT / FR01 / 02125, filed in France on Jul. 3, 2001, which claims the priority of French Patent Application No. 00 09 392, filed in France on Jul. 18, 2000, the entire contents of both applications are hereby incorporated herein by reference.BACKGROUND OF THE APPLICATION[0002] The present invention relates to a plasterboard composition, a method of preparing this composition and a process for manufacturing plasterboards having a greatly improved fire resistance.[0003] It is well known to use plasterboards for producing partitions, coverings of vertical or inclined elements, or for producing ceilings, whether suspended or not.[0004] These boards generally consist of a core, essentially made of plaster, covered on each of its sides with a sheet which serves both as reinforcement and as facing and which may be made of paperboard or of mats of mineral fibres.[0005] U.S. Pat. No. 3,616,173 describes a fire-...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B28B1/30C04B14/06C04B14/10C04B14/20C04B14/26C04B14/30C04B14/42C04B22/08C04B28/14C04B111/28
CPCC04B14/10C04B14/26C04B28/14C04B2111/0062C04B2111/10C04B2111/28C04B14/202C04B14/303C04B14/42C04B22/0013Y10T428/249924Y10T428/249946Y10T428/249925
Inventor LECLERCQ, CLAUDE
Owner LAFARGE PALTRES SA
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