WO2012101128A1 - Sulphur cement pre-composition and sulphur cement product - Google Patents

Sulphur cement pre-composition and sulphur cement product Download PDF

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Publication number
WO2012101128A1
WO2012101128A1 PCT/EP2012/051059 EP2012051059W WO2012101128A1 WO 2012101128 A1 WO2012101128 A1 WO 2012101128A1 EP 2012051059 W EP2012051059 W EP 2012051059W WO 2012101128 A1 WO2012101128 A1 WO 2012101128A1
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Prior art keywords
sulphur
formula
cement
composition
sulphur cement
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PCT/EP2012/051059
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French (fr)
Inventor
Paul De Boer
Jan KOLIJN
Catherine Frances Smura
Guy Lode Magda Maria Verbist
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Shell Internationale Research Maatschappij B.V.
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Priority to EP11151976 priority Critical
Priority to EP11151976.5 priority
Application filed by Shell Internationale Research Maatschappij B.V. filed Critical Shell Internationale Research Maatschappij B.V.
Publication of WO2012101128A1 publication Critical patent/WO2012101128A1/en

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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/36Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing sulfur, sulfides or selenium
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/40Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
    • C04B24/42Organo-silicon compounds
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients

Abstract

A sulphur cement pre-composition, a sulphur cement-product and a wax-based pre-composition, all comprising organosilane compounds, are disclosed.

Description

SULPHUR CEMENT PRE-COMPOSITION AND SULPHUR CEMENT PRODUCT
Field of the Invention
The present invention provides a sulphur cement pre- composition and a process for the preparation of a sulphur cement pre-composition . The invention further provides a sulphur cement product and a process for the preparation of a sulphur cement product.
Background of the Invention
Elemental sulphur or modified sulphur can be used to bind aggregate and filler, thereby providing sulphur cement products such as sulphur cement, sulphur mortar and sulphur concrete. Sulphur concrete can be used in a variety of pre-cast concrete applications such as marine defences, paving slabs, road barriers and retaining walls .
It is known to use organosilane compounds as a stabilising agent in sulphur cement products to improve water stability. In US 4,164,428 for example, a modified sulphur composition (often referred to a plasticized sulphur composition) comprising at least 50% by weight of sulphur, a sulphur modifier (often referred to a sulphur plasticizer) , a finely divided particulate mineral suspending agent, and an organosilane stabilising agent is disclosed. It is mentioned that suitable organosilanes have the general molecular formula R-Si(OR/ ) 3, wherein R' is a low molecular weight alkyl group and R is an organic radical having at least one functional group, usually bonded to the silicon atom by a short alkyl chain. Gamma- mercaptopropyltrimethoxysilane is mentioned as a
preferred organosilane. In WO 2007/65920, sulphur cement or a sulphur cement-aggregate composite is prepared by admixing an inorganic filler and a polysulphide-containing
organosilane, mixing with molten sulphur and solidifying the admixture. This process provides sulphur cement or a sulphur cement-aggregate composite with lower water uptake. A preferred polysulphide-containing organosilane is bis ( 3-triethyoxysilylpropyl ) tetrasulphide .
In WO 2008/148804, a sulphur cement pre-composition is prepared by mixing sulphur with a polysulphide- containing organosilane. The sulphur cement pre- composition can be mixed with particulate inorganic material to provide a sulphur cement product. The sulphur cement products have improved water uptake behaviour. A preferred polysulphide-containing organosilane is bis (3- triethyoxysilylpropyl ) tetrasulphide .
US 4,376,830 discusses the problem of preparing sulphur cement products using aggregates that are
contaminated with water-expandable clays. These clays can cause the sulphur mortar or concrete to disintegrate when exposed to water. It is possible to remove the clays by washing procedures, but this is uneconomical. The λ830 patent teaches that organosilanes having functional groups such as amino, epoxy and mercapto groups can be incorporated into sulphur mortar or concrete to reduce the water expandability of the water-expandable clay.
The present inventors have sought to find
alternative organosilane compounds that can
advantageously be incorporated into sulphur cement products. Summary of the Invention
Accordingly, the present invention provides a sulphur cement pre-composition, comprising sulphur and an organosilane com ound of formula (I) or formula (II) :
Figure imgf000004_0001
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo.
The inventors have found that the organosilane compounds of formula (I) or formula (II), which are secondary or tertiary amine compounds with at least two organosilane head groups, can be used to provide sulphur cement pre-compositions that can be used to make sulphur cement products. The organosilane compounds of formula
(I) and (II) have higher boiling points than some other organosilane compounds (e.g. 3- aminopropyltriethoxysilane ) and this can lead to less boil-off during sulphur cement product preparation such that less organosilane is needed to achieve the desired properties. Additionally, the organosilane compounds of formula (I) and (II) hydrolyse more slowly than some other organosilane compounds (e.g. 3- aminopropyltriethoxysilane ) , and this may lead to more controlled release of leaving groups as the compounds come into contact with filler and aggregate. The
organosilane compounds of formula (I) and (II) contain secondary or tertiary amino groups and the inventors have found that organosilane compounds having amino groups are particularly suitable for preparing sulphur cement products comprising porous sand with a high surface area.
In a further aspect, the invention provides a sulphur cement product, comprising sulphur, a particulate inorganic material and an organosilane compound of formula (I) or formula (II) :
Figure imgf000005_0001
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo.
In a yet further aspect, the invention provides a wax-based pre-composition comprising wax and an
organosilane com ound of formula (I) or formula (II) :
Figure imgf000005_0002
(I) (ID wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo.
In a yet further aspect, the invention provides a process for the preparation of a sulphur cement pre- composition, comprising admixing sulphur with an organosilane com ound of formula (I) or formula (II) :
Figure imgf000006_0001
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo.
In a yet further aspect, the invention provides a process for the preparation of a sulphur cement product comprising the steps of:
(a) admixing sulphur with a particulate inorganic material and an organosilane compound of formula (I) or formula (II) :
Figure imgf000007_0001
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo, and with a particulate inorganic material at a
temperature at which sulphur is molten to obtain a molten sulphur cement product; and
(b) solidifying the molten sulphur cement product.
Reference herein to a sulphur cement pre-composition is to a composition, which after addition of at least one of sulphur or a particulate inorganic material forms a sulphur cement product, e.g. a sulphur cement, a sulphur mortar, sulphur concrete or sulphur-extended asphalt.
Sulphur cement products produced according to the invention can be used in a variety of applications.
Sulphur concrete may be used in pre-cast concrete
applications such as marine defences, paving slabs, road barriers and retaining walls.
Detailed Description of the Invention
The sulphur cement pre-composition according to the invention comprises sulphur and an organosilane compound of formula (I) or formula (II) :
Figure imgf000008_0001
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo.
Preferably X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are C1-C6 alkoxy, more preferably methoxy or ethoxy.
Preferably Y1, Y2, Y3, Y4 and Y5 are C1-C6 alkoxy, more preferably methoxy or ethoxy. Preferably R3 is H.
A preferred compound of formula (I) is bis (3- triethoxysilylpropyl ) amine.
Preferably, the sulphur cement pre-composition comprises at least 0.01 wt% of the organosilane compounds of formula (I) and/or (II) based on the weight of the total composition. More preferably, the sulphur cement pre-composition comprises in the range of from 0.01 to 40wt%, yet more preferably from 0.01 to 20 wt%, even more preferably from 0.01 to 10wt% and most preferably 0.01 to 1 wt% of the organosilane compounds of formula (I) and/or (II) based on the weight of the total composition. The preferred amount of organosilane compounds of formula (I) and/or (II) is largely determined by the intended use of the sulphur cement pre-composition. For example, if the sulphur cement pre-composition is combined with filler and with further sulphur to form a sulphur cement, then the weight percentage of organosilane compounds of formula (I) and/or (II) is likely to be high, e.g. from 0.1 to 40wt%, because the sulphur cement pre-composition is effectively a concentrate of the sulphur plus coupling agent. Conversely, if the sulphur cement pre-composition is combined with filler only to form a sulphur cement, then the weight percentage of organosilane compounds of formula (I) and/or (II) is likely to be lower, e.g. from 0.01 to lwt%.
In addition, the sulphur cement pre-composition may comprise a sulphur modifier. Typically, the sulphur cement pre-composition may comprise sulphur modifiers in an amount in the range of from 0.1 to 10 wt% based on the weight of sulphur. Such modifiers are known in the art. Examples of such modifiers are aliphatic or aromatic polysulphides or compounds that form polysulphides upon reaction with sulphur. Examples of compounds that form polysulphides are naphthalene or olefinic compounds such as 5 ethylidene-2-norbornene (ENB) or 5 vinyl-2- norbornene (VNB) , dicyclopentadiene, limonene or styrene.
The sulphur cement pre-compositions according to the invention may be advantageously produced off-site and used on-site in small volumes. The sulphur cement pre- composition may contain a concentration of organosilane compounds of formula (I) and/or (II), which is higher than the concentration typically used in a process for preparing a sulphur cement product. When used on-site to prepare for instance a sulphur cement product, such a sulphur cement pre-composition may suitably be added in such amounts to an inorganic material that the need for stabilising agent is satisfied. The sulphur cement product may be completed by adding additional sulphur and other ingredients if not sufficiently present in the sulphur cement pre-composition .
The invention further provides a sulphur cement product, comprising sulphur, a particulate inorganic material and an organosilane compound of formula (I) or formula (II) .
A sulphur cement refers to a composition comprising sulphur or modified sulphur and a filler. Usual sulphur cement fillers are particulate inorganic materials with an average particle size in the range of from 0.1 μπι to
0.1 mm. The filler content of sulphur cement may vary widely, but is preferably in the range of from 1 to 50 wt%, based on the total weight of the sulphur cement.
A sulphur mortar comprises fine aggregate, typically with particles having an average diameter between 0.1 and
5 mm, for example sand and does not comprise coarse aggregate .
Sulphur concrete comprises coarse aggregate,
typically with particles having an average diameter between 5 and 40 mm, and optionally comprises fine aggregate .
Sulphur-extended asphalt comprises aggregate and a binder that contains filler and a residual hydrocarbon fraction, wherein part of the binder has been replaced by sulphur, usually modified sulphur.
Preferably, the particulate inorganic material in the sulphur cement product has oxide or hydroxyl groups on its surface. Examples of suitable particulate
inorganic materials are silica, fly ash, limestone, quartz, iron oxide, alumina, titania, carbon black, gypsum, talc or mica, sand, gravel, rock or metal- silicates. Such metal silicates are for example formed upon heating heavy metal containing sludge in order to immobilise the metals. More preferably the particulate inorganic material is a silica or a silicate. Examples of such silica or silicates are quartz, sand, metal- silicates (e.g. mica) .
The organosilane compounds of formula (I) and (II) are particularly appropriate for use in sulphur cement products comprising porous sand having a surface area of greater than 0.5m2/g, preferably greater than 1.5m2/g. The surface area of the sand is measured according to the BET technique using nitrogen, following the procedure as set forth in Example 1.
The sulphur cement product preferably comprises the organosilane compounds of formula (I) and/or (II) in the range of from 0.001 to 2wt%, more preferably of from 0.01 to lwt%, and most preferably of from 0.02 to 0.5wt%, based on the weight of the sulphur cement product.
The invention further provides a process for the preparation of a sulphur cement pre-composition,
comprising admixing sulphur with an organosilane compound of formula (I) or formula (II) . The organosilane
compounds of formula (I) or formula (II) may be admixed with the sulphur by any means known in the art. The organosilane compounds of formula (I) or formula (II) may first be dissolved in a small amount of solvent, for example an alcohol or a hydrocarbon, in order to
facilitate the admixing with the sulphur. The solvent preferably has a boiling point such that it evaporates during the admixing step.
Preferably, the sulphur and organosilane compound of formula (I) or formula (II) are admixed at a temperature at which sulphur is molten. The temperature at which sulphur is molten is typically above 120°C, preferably in the range of from 120 to 150°C, more preferably in the range of from 125 to 140°C. Mixing at temperatures at which the sulphur is molten may provide a homogeneous distribution of the organosilane compound of formula (I) or formula (II) in the sulphur. Preferably the obtained sulphur cement pre-composition is cooled to a temperature at which the sulphur solidifies. The solid sulphur cement pre-composition can be easily stored or transported. It is thought that the sulphur cement pre-compositions of the invention may have better storage stability than sulphur cement pre-compositions comprising other
organosilanes (e.g. 3-aminopropyltriethoxysilane ) because hydrolysis of the organosilanes of formula (I) and/or formula (II) is slower.
In a further aspect the present invention provides a wax-based pre-composition comprising an organosilane compound of formula (I) or formula (II) . The wax
functions primarily as a carrier material. The wax-based pre-composition preferably comprises less than lwt% aggregate; and most preferably comprises no aggregate. Preferably the wax-based pre-composition additionally comprises a filler or mineral adsorbate, e.g. calcium silicate, carbon black or calcium carbonate. The wax- based pre-composition preferably comprise up to 70wt% wax, up to 20wt% mineral adsorbate and greater than 10wt% of organosilane compound of formula (I) and/or formula
(II), where weight percentages are based upon the weight of the wax-based pre-composition. In addition to wax, the wax-based pre-composition may also comprise polymer and/or sulphur. Preferably the wax-based pre-composition comprises less than 10wt% sulphur.
The invention yet further provides a process for the preparation of sulphur cement product, comprising the steps of: (a) admixing sulphur with an organosilane compound of formula (I) or formula (II), and with a particulate inorganic material at a temperature at which sulphur is molten to obtain a molten sulphur cement product; and (b) solidifying the molten sulphur cement product.
In one embodiment of the process, a sulphur cement product is prepared by admixing in step (a) a sulphur cement pre-composition according to the invention and a particulate inorganic material at a temperature at which sulphur is molten to obtain a molten sulphur cement product. In another embodiment of the process, a sulphur cement product is prepared by admixing in step (a) , elemental or modified sulphur, an organosilane compound of formula (I) or formula (II), and a particulate
inorganic material, i.e. the sulphur and organosilane compound are used as individual components rather than as a sulphur cement pre-composition. In yet another
embodiment of the process, a sulphur cement product is prepared by admixing in step (a) a wax-based pre- composition according to the invention, elemental or modified sulphur and a particulate inorganic material at a temperature at which sulphur is molten to obtain a molten sulphur cement product.
In one embodiment of the process, in step (a) the organosilane compound of formula (I) or formula (II) may first be admixed with the particulate inorganic material in a pre-treatment step, and then subsequently the treated particulate inorganic material is admixed with sulphur. The organosilane compound of formula (I) or formula (II) is preferably admixed with the particulate inorganic material by dissolving the organosilane
compound in a small amount of solvent, for example an alcohol or a hydrocarbon, and admixing with the particulate inorganic material. The solvent preferably has a boiling point such it evaporates during the
admixing step.
Step (a) is carried out at a temperature at which sulphur is molten, i.e. typically above 120°C, preferably in the range of from 120 to 150°C, more preferably in the range of from 125 to 140 C.
Optionally further ingredients such as sulphur modifiers may be admixed during step (a) . Preferably, all ingredients of the sulphur cement product are admixed at a temperature at which sulphur is liquid.
In step (b) the molten sulphur cement product is solidified by cooling the product to a temperature at which the sulphur solidifies.
Examples
The invention is further illustrated my means of the following non-limiting examples.
Example 1
Samples consisting of 25wt% sulphur, 24wt% quartz and 51wt% washed high-surface area sand with a surface area of greater than 2m2/g (determined using the BET surface area technique with nitrogen according to the procedure set out below) were prepared using the method set out below.
The BET surface area of the washed high-surface sand was measured using TriStar II 3020 apparatus
(Micromeritics Instrument Corporation) . A sample of 5.5866 g of (high surface area) sand from Qatar (washed, pre-sieved to below 2.36 mm particles size) was
transferred to a 20 ml vial and dried in an oven at 125-
150°C for 2 days. The sample was transferred to the sample holder of the set-up and measurements were done using nitrogen adsorption at temperature of 77K. The relative pressure (p/po) was varied from 0.02 to 0.3 and in that interval 8 measurements points were collected for the adsorbed amount of nitrogen, obtaining in this way an isotherm plot. The data were processed according to the BET adsorption model using the set-up software. From the linear fit of the BET surface area plot, the BET specific surface area was calculated.
The method for preparing the sample was as follows. All components were pre-heated and weighed into mixing vessel; bis ( 3-triethoxysilylpropyl ) amine was then added. The bis ( 3-triethoxysilylpropyl ) amine was diluted in ethanol, at a concentration of 10 %. The contents of the vessel were heated to 140°C and mixed for approximately 1 hour to give a homogeneous consistency. The mix was then placed into a pre-heated 4xlxlcm3 silicone mould. The prism was submerged under water and mass increase was followed as a function of time. The strength of the samples both dry and wet were measured, using a 3-point bending test. The strength retention values were
calculated from the wet strength divided by the initial, dry strength.
Table 1 shows water uptake values and strength retention values for a range of concentrations of bis (3- triethoxysilylpropyl ) amine (given as weight percentages, based upon the weight of the sulphur mortar) :
Table 1
Concentration of Water Uptake % Strength organosilane (wt%) retention
0.0426 2.827 24.62
0.1065 1.915 38.50
0.1706 1.774 43.15
0.2345 1.001 50.52
0.3199 0.527 79.71
0.4264 0.435 104.10 0.4267 0.452 129.92
0.6398 0.676 77.50
0.8531 0.703 102.80
The lowest water uptake and greatest strength retention are provided by the sulphur mortars having approximately 0.4wt% bis ( 3-triethoxysilylpropyl ) amine . Example 2
Approximately 200g of sulphur mortar was prepared using 25% (by mass of the total composite) sulphur, 28% quartz filler and 47% of the high surface area sand
(which was sieved to remove particles with diameter greater than 2.36 mm, having a surface area of greater than 2m2/g; determined in the way set out in Example 1) . All ingredients were placed in a heated mantle at a temperature of 140°C and mixed manually. Once the sulphur was molten and the mix was fully homogeneous
(approximately 30 minutes), bis (3- triethoxysilylpropyl ) amine was added using a syringe. After further mixing (15 minutes), the final mix was placed into a pre-heated silicone mould of dimensions 4x4x16cm3 and tapped to ensure a smooth surface and to eliminate trapped air. Once cooled, the mortar prisms were removed from the moulds and broken into two pieces that were left for at least 3 days before being submerged under water. Water uptake was monitored by following the mass increase of the samples at regular intervals of time. Table 2 shows the water uptake after 7 days for a range of concentrations of bis (3- triethoxysilylpropyl ) amine, given as a weight percentage, based upon the weight of the sulphur mortar. Table 2
Figure imgf000017_0001
The lowest water uptake is provided by the sulphur mortars having between 0.05 and 0.2wt% bis (3- triethoxysilylpropyl ) amine.
Example 3 and Comparative Examples
For each sample, lOOg of sulphur mortar was prepared using 25% (by mass of the total composite) sulphur, 28% quartz filler and 47% of norm sand. All ingredients (together with an organosilane which was diluted to 10% in ethanol) were dosed into a glass vessel at ambient temperature. The organosilanes were added in amounts of between 0.04 and 0.1 % by mass of the total composite, with the actual mass being calculated to give an
equimolar amount of Si in each case. The vessel and content were subsequently heated at a temperature of approximately 140°C, and rotated at an inclination (to initiate mixing) for approximately 1 hour. After a fully homogeneous mix was achieved, it was placed into pre¬ heated silicone moulds of dimension 1x1x4cm3 and tapped to ensure a smooth surface and to eliminate trapped air. Once cooled, the mortar prisms were removed from the moulds and left for at least 2 days before being
submerged under water. Water uptake was monitored by following the mass increase of the samples at regular intervals of time. The flexural strength of the samples was measured both before and after water uptake. The water uptake after four weeks and the strength retention are reported in Table 3:
Table 3
Water
uptake
after 4 Strength
Organosilane weeks, % retention
Comparative
Example 1 None 1.21 61.3
Comparative
Example 2 Benzyl triethoxysilane 0.61 121.5
Comparative (Cyclohexylaminomethyl )
Example 3 triethoxysilane 1.25 73.9
Comparative 5, 6 epoxyhexyl
Example 4 triethoxysilane 0.82 70.4
Comparative S-octanoyl
Example 5 mercaptopropyl
triethoxysilane 0.58 90.2
Comparative
Example 6 Triethoxysilylundecanal 0.49 89.6
Comparative Chloromethyl
Example 7 triethoxysilane 0.55 63.8
Comparative
Example 8 n-Hexyltriethoxysilane 0.34 144.2
Example 3 Bis [3-
( triethoxysilyl ) propyl ]
amine 0.30 114.1
Comparative 1 , 2-Bis (triethoxysilyl )
Example 9 ethane 1.03 69.2
Comparative
Example 10 Allyl triethoxysilane 0.57 67.6
Comparative Triethoxysilylpropyl
Example 11 ethylcarbamate 0.63 78.5
Comparative
Example 12 n-octyltriethoxysilane 0.16 88.6
Comparative 2- Example 13 (diphenylphosphino) ethy
1triethoxysilane 0.25 84.5
Comparative 3-isocyanatoproply
Example 14 triethoxysilane 0.63 100.3
Comparative Isobutyl
Example 15 triethoxysilane 0.45 78.1
Comparative Aminopropyltriethoxy 0.15 87.7 Water
uptake
after 4 Strength
Organosilane weeks, % retention
Example 16 silane
Comparative Chloropropyltriethoxy
Example 17 silane 0.86 70.3
Comparative bis-
Example 18 triethoxysilylpropyl
tetrasulfide 0.25 85.2
Of 18 different organosilanes tested in this way, bis ( 3-triethoxysilylpropyl ) amine (example 3) was found be one of the most effective in terms of strength
retention after water uptake.

Claims

C L A I M S
1. A sulphur cement pre-composition, comprising sulphur and an organosilane compound of formula (I) or formula (ID :
Figure imgf000020_0001
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo.
2. A sulphur cement product, comprising sulphur, a particulate inorganic material and an organosilane compound of formula (I) or formula (II) :
Figure imgf000020_0002
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo.
3. A wax-based pre-composition comprising wax and an organosilane com ound of formula (I) or formula (II) :
Figure imgf000021_0001
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo.
4. A process for the preparation of a sulphur cement pre-composition, comprising admixing sulphur with an organosilane com ound of formula (I) or formula (II) :
Figure imgf000021_0002
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo.
5. A process for the preparation of a sulphur cement product comprising the steps of:
(a) admixing sulphur with a particulate inorganic material and an organosilane compound of formula (I) or formula (II :
Figure imgf000022_0001
(I) (ID
wherein R1, R2, R4, R5 and R6 are independently chosen from Ci-Ce alkyl; R3 is H or Ci-C6 alkyl; X1, X2, X3, X4, X5, X6, X7, X8, X9 and X10 are independently chosen from alkoxy, hydroxy, halo or alkyl; and Y1, Y2, Y3, Y4 and Y5 are independently chosen from alkoxy, hydroxy or halo, and with a particulate inorganic material at a
temperature at which sulphur is molten to obtain a molten sulphur cement product; and
(b) solidifying the molten sulphur cement product.
PCT/EP2012/051059 2011-01-25 2012-01-24 Sulphur cement pre-composition and sulphur cement product WO2012101128A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164428A (en) 1978-03-02 1979-08-14 Chevron Research Company Plasticized sulfur composition
US4376830A (en) 1981-08-10 1983-03-15 Chevron Research Company Sulfur cement-aggregate-organosilane compositions and methods for preparing
WO2007065920A2 (en) 2005-12-09 2007-06-14 Shell Internationale Research Maatschappij B.V. Process for the preparation of sulphur cement or a sulphur cement-aggregate composite
WO2008148804A1 (en) 2007-06-07 2008-12-11 Shell Internationale Research Maatschappij B.V. Sulphur cement pre-composition and process for preparing such sulphur cement pre-composition
WO2011000837A1 (en) * 2009-07-01 2011-01-06 Shell Internationale Research Maatschappij B.V. Sulphur cement pre-composition and sulphur cement product

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4164428A (en) 1978-03-02 1979-08-14 Chevron Research Company Plasticized sulfur composition
US4376830A (en) 1981-08-10 1983-03-15 Chevron Research Company Sulfur cement-aggregate-organosilane compositions and methods for preparing
WO2007065920A2 (en) 2005-12-09 2007-06-14 Shell Internationale Research Maatschappij B.V. Process for the preparation of sulphur cement or a sulphur cement-aggregate composite
WO2008148804A1 (en) 2007-06-07 2008-12-11 Shell Internationale Research Maatschappij B.V. Sulphur cement pre-composition and process for preparing such sulphur cement pre-composition
WO2011000837A1 (en) * 2009-07-01 2011-01-06 Shell Internationale Research Maatschappij B.V. Sulphur cement pre-composition and sulphur cement product

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