AU441663B2 - Extruded shaped products - Google Patents

Description

18.532 17 The present invention is concerned with extruded shaped additives. products comprising inorganic binders, fillers and A method is known for manufacturing shaped asbestos cement products in which a hydromodifier is added during the forming 60% asbestos processes to a cement mixture consisting of 1.0 to of fibres, 10 to 85% cement and 14 to 50% water, for the purpose ensuring its plasticity and stability of shape (see Austrian Patent Specification No. 256,689). Conventional aggregates, such. process. as sand, may be added to the mixture before the shaping The hydromodifiers used may be organic substances having a molecular weight above 400, for example, methyl cellulose, ethylene oxide polymers, acrylic acid copolymers, polyvinyl alcohol and the like. German Patent Specification No. 814,421 discloses the compounds manufacture, by extrusion, of shaped components from containing anhydride, wherein small amounts of high molecular starch weight glue-like substances, such as cellulose ethers, or the like, are added to the mixing water used for the anhy- drite. These substances may also, if desired, be mixed with the anhydrite during grinding thereof. Austrian Patent Specification No. 205,400 describes a method of manufacturing building boards and insulating bricks made of medium-fine ground anhydrite binder, calcined gypsum saw- and water, optionally with the addition of fillers, such as dust, chaff, reeds, vermiculite and the like, the compositions apparatus. being mixed before extrusion and kneaded in a suitable Furthermore, German Patent Specification .No. 812,414 dis- closes a method of manufacturing building elements, such as roof tiles or the like, wherein natural or synthetic Anhydrite is formed into a paste with water, optionally after

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53 2 PO shaped in extruders ading filles, whereupon the coMposition is

or other conventional apparatus. difficulties In all the foregoing methods of manufacture, overcome attempts have been made to occur in the extruding and additives or by using these difficulties by using suitable the starting materials. Another determined grain sizes of that methods resides in the fact disadvantage of these knoIn 1 to 2 weeks until they the products must be stored for from for use. If it-is desired to obtain achieve adequate strength the products, with cement a stronger product more quickly, be after-treated in an autoclave; and/or lime as binder, must calcium sulphate as binder, in the case of products containing is not possible. however, this after-treatment invention to provide It is an object of the present based on inorganic hydraulic a composition for shaped bodies of which is not only capable binders, together with fillers,' within also attains great strength satisfactory extrusion but requiring auto-clave treatment. a short period of time, without invention, there is Thus, according to the present least body formed from resin, at provided an extruded shaped wherein, and at least one filler, one inorganic hydraulic binder containing at least one amino resin as resin, there is used at least an amino-s-triazine containing acid groups and hLsed on two NH2 groups. to the present invention, It surprising that, according is only to possible, with the aid of the resin additive, not it is of the but also high early strength achieve good extrudability extruded shaped Darts. are amino resin must contain The acid groups which the groups. preferably sulphonic acid

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1 532 p7 Even small additions of the.resin containing acid groups, i.e. from 0.1 to 5% by weight, preferably 0.5 to X* by weight, of solid resin, referred to the binders used, are adequate. The amino resins containing acid groups and based on an amino-s-triazine containing at least two NH2 groups which are used are preferably the liquid and solid types of resin conuercially available under the Registered Trade Mark "Melment". These are condensation products, containing sulphonic acid groups, of an amino-s-triazine containing at least two NH 2 groups and formaldehyde. 20% aqueous solutions of these resins have viscosities of from 3 to 500 cP. In addition, for.certain binder mixtures it is also convenient to add small amounts of an anionic surface active agent, i.e. 0.01 to 1% by weight, preferably 0.05 to 0.1% by weight, referred to the binders used. Extrudability is thereby further improved, without the strength values being substantially impaired. Anionic surface active agents which can be used for this purpose are commercially available products, for example, sodium salts of alkylaryl-sulphonic acids or sodium salts of a sulphonated fatty acid condensation product. Portland cement, calcium sulphate, magnesite binders and lime can be used as binders. The substances employed as fillers for shaped parts on the basis of the above-mentioned binders are for example, powdered minerals, sand (maximum grain size 15 vermiculite. perlite, puzzolana, organic fibre materials, such as cellulose, and also inorganic fibre materials, such as asbestos and rock wool.

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1 ,532 7o Potassium sulphate is advantageously added in small

amounts, as a known accelerator, in the extrusion of anhydrite

mixtures.

The term "extruded shaped parts" used herein is intended

to comprise, for example finished parts, such as boards, pipes,

street and road building parts, window frames, window boards,

beams, swimming pool surrounds, fireproof shaped bodies, spacers, bearer ceilings, and profiled bodies of various types.

An important advantage of the shaped bodies according to

the present invention is, in particular, their good early

strength which, for example, in the case of anhydrite bound

shapedbodies substantially shortens thehardening time and, ih

the case of cement-bound shaped bodies, renders an autoclave

after-treatment unnecessary.

SAnother advantage is the good extrudability of the mix- tures described which, amongst other things, results in low

current consumption.

The following Examples are given for the purpose of

illustrating the present invention:-

EXAMPLE 1 24 parts by weight of sand (maximum grain size 5 mm.),

2.4 parts by weight of ground mineral and 8 parts by weight of

Portland cement 2.75 are premixed dry in a forced circulation

mixer, whereupon water and the additives indicated in Table 1

are added and mixing is continued. The mortar obtained is extruded through a 4 x 4 cm. nozzle.

Two days after production, the extruded products are cut and

their -tensile bending and compressive strengths determined.

The results are shown in Table 1.

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1 ,532 P TABLE 1

Example Additive Type Amount Water Tensile Compressive No. Parts Parts bending 'strength by by strength after2 2 days weight weight after 2 kp/c days 2 kp/cm

la 3.4 80 349

lb Melment L 10 0.4 2.55 92 434

lc Melment L 300 0.4 2.8 87 381

Id 98% Melment L 10 (1) 2% Surface active agent 0.4 2.53 87 373

le 50% Melment L 300 (1) 49% Melment L 10 (1) 1% Surface active agent 0.4 2.5 84 442

Melment R L 10 and L 300 are 20% solutions of an amino-s-

triazine resin containing acid groups.

Sodium salts.of alkylaryl-sulphonic acids. EXAMPLE 2

24 parts by weight of sand (maximum grain size 5 mm), 2.4

parts by weight of ground mineral and 8.4 parts by weight of

anhydrite binder (premixed from 8 parts by weight of anhydrite

AB 200 (German Industrial Standard No. 4208), 0.32 parts by

weight of Portland cement 275 and 0.08 parts by weight of

potassium sulphate) are dry mixed in a forced circulation mixer, whereupon water and additives (see Table 2) are added

and mixing is continued until a homogereous mortar is obtained.

The anhydrite mortar is extruded through a 4 x 4 cm. nozzle,

Four days after production, the extruded products are cut

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I ,532 RO and the tensile bending and compressive strengths are determined. The results are shown in Table 2. -TABLE- 2

Example Additive Type Amount 'Water Tensile Compressive No. Parts Parts bending strength by by strength after2 4 days weight weight after 4 kp/cm days 2 kp/cm

.2a 3.55 30 110

2b Melment L 0.4 2.42 57 310

2c 98% Melment L 10 (1) 2% Surface active agent 0 0.4 2.37 42.5 258

See footnote to Table 1. Examole 3 The following mixture was produced in a forced circulation mixer: .58 parts by weight of Portland cement 375 12 parts by weight of asbestos mixture of types 5,6,7 according to the Quebec Standard Test parts by weight of water 1 part by weight of additive A or B. L Additive A consists of 99.9 parts by weight of Melment and 0.1 part by weight of surface active agent Additive B consists of 49.95 parts by weight of Melment L 50.0 parts by weight of Melment L 300 and 0.05

parts by weight of a surface-active agent See footnote to Table 1. a After intensive mixing,the mixture was extruded through

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1 ,532 T shown in Table 3. 1.7 x 1.7 cm. nozzle. The results are TABLE 3

2 Strengths in kp/cm

After 1 day After 3 days

Tensile Tensile s bending Compressive bending compressive Example strength strength strength No. Additive strength

52 165 83 289 3a A 220 89 291 3b B 64

by using finely Similarly good results are also achieved ground quartz sand. cannot be extruded. Without additive A or B, the mixture EXAMPLE 4 grain size 5 mm.), 24 parts by weight of sand -(maximum and 8.4 parts by weight 2.4 parts by weight of ground mineral of 8 parts by weight of an- of anhydrite binder (consisting Standard No. 4208), 0.32 hydrite AB 200 (German Industrial and 0.08 parts by weight parts by weight of calcium hydroxide mixed in a forced circulation of potassium sulphate) are dry and 0.4 parts by weight mixer; 2.42 parts by weight of water until of Melment L 10 are then added. Mixing is continued This anhydrite mortar is a homogeneous mortar is obtained. The results are shown extruded through a 4 x 4 cm. nozzle. in Table 4.

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1, 53 2 PO TABLE 4

Strength after 4.days

Tensile: bending Compressive strength strength kp/cm 2 kp/cm2

Without Melment L 10(1) 28 102 With 0.4 parts by weight of Melment L 10(1) 50 285

See footnote to Table 1. In Specification No. 1,169,582, there is described and claimed a building material, consisting of a resin, an inorganic binder and possibly a filler wherein said material contains from 0.01 to 30o by weight, referred to the inorganic binders, of a resin modified with a sulphite, with a sulphonic acid or with rongalite, said resin being a reaction product of an amino-s-triazine containing at least two NH2 groups with formaldehyde.

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Claims (1)

18,532 170 The claims defining the invention are as follows:- 1. Xn extruded shaped body formed from resin, at least one hydraulic inorganic binder and at least one filler, wherein, as resin, there is used at least one amino resin containing acid groups and based on an amino-s-triazine containing at 2 groups. least two NIH 2. An extruded shaped body according to claim 1, wherein the amino resin contains sulphonic acid groups. 3. An extruded shaped body according to claim 1 or 2, compr- isingO.1 to 5% by weight of the amino resin, calculated as solid material and referred to the binders used. 4. An extruded shaped body according to claim 3, comprising to Vi by weight of the amino resin. An extruded shaped body according to any of the preceding claims, which additionally contains 0.01 to 1% by weight of an anionic surface-active agent, referred to the binders used. 6. An extruded shaped body according to claim 5, which contains 0.05 to 0.1% by weight of an anionic surface-active agent. 7. An extruded shaped body according to any of the preceding claims, wherein the binder used is Portland cement, calcium

sulphate, magnesite or lime. 8. An extruded shaped body according to any of the preceding claims, wherein the filler used is a ground mineral, sand, or an organic or inorganic fib'rous material. 9. An extruded shaped body according to any of claims 2-8, wherein the amino resin used is a condensation product, contain- ing sulphonic acid groups, of an amino-s-triazine containing at least two NI 2 groups and formalde-hydej said condensation

product having viscosity of between 3 and 500 cP in a 20% by wleight aqueoris solution.

1 .53 2 o An extruded shaped body according to any of the preceding claims, wherein, in the case of anhydrite, potassium sulphate has been used as accelerator in the production thereof. 11. An extruded shaped body according to-Claim 1, substan- tially as hereinbefore described and exemplified. DATED this 9th day of October 1973

SUDDEUTSCHE KALKSTICKSTOFFWERKE AG. -and- HIFRA LE LOCLE S.a.r.l. Patent Attorneys for the Applicant:

F.B. RICE CO.

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