DE1940510B - Extruded moldings - Google Patents

Description

Ciruppen and formaldehyde. The 20% strength aqueous solutions of these resins have viscosities of 5 to 300 cP.

In addition, small amounts of an anion-active surfactant, i. H. 0.01 to 1 percent by weight, preferably 0.05 to 0.1 percent by weight, based on the binder used, for certain Bindemiltelmischungen are expediently used as additives. This increases the compressibility still improved without the strength values being significantly impaired. For the addition suitable anionic surfactants are the commercially available products, e.g. B. sodium salts of alkylarylsulfonic acids or sodium salts of a sulfated fatty acid condensation product.

Clinker (sintered raw material for cement production) and cements, calcium sulfate, Magnesite binder and lime into consideration.

Fillers that can be used are those customarily used in molded parts based on the abovementioned binders Substances are used, e.g. B. Gefteinsmehl, sand (maximum grain size 15 mm), vermiculite, Perlite, pozzolans, organic fiber «materials such as cellulose, as well as inorganic fiber-biological materials, such as asbestos, rock wool, etc.

When compressing anhydrite mixtures It is advisable to use small amounts of potassium sulphate as a known stimulator.

Under extruded molded parts within the meaning of the invention, for. B. ^ Prefabricated parts, such as plates, pipes. Road and V-components, window frames, window sills, beams, surrounds of swimming pools, Understood fire-resistant moldings, spacers, support ceilings and profiles of various types.

An important advantage of the moldings according to the invention is a particularly good early strength, you * for example in the case of anhydrite-bonded molded bodies. ίο the setting time is significantly reduced, for cement-bound Post-treatment in the autoclave is no longer necessary for moldings.

Another advantage is the good compressibility of the mixtures described, which among other things results in low power consumption.

example 1

24 parts by weight of sand (maximum grain size 5 mm), 2.4 parts by weight of rock flour and 8 parts by weight Portland cement 275 are premixed dry in a compulsory mixer, then water is added and Add the additives given below and continue mixing (see Table 1).

The mortar is extruded through a 4 χ 4 cm nozzle. 2 days after production, the pressed strands are cut and the bending tensile and compressive strength determined. The results are shown in Table 1.

table example

Additional means type

la

I a I methyl cellulose

I a 2 polyacrylamide

Ia3 carboxymethyl cellulose

I b 20% aminoplast resin solution with a viscosity of 10 cP

1 c 20 "ige aminoplast resin solution with a Viscosity of 300 cP

I d 98% of a 20% aminoplast resin solution with a viscosity of 10 cP + 2% surfactant ¹ )

I e 50% of a 20% aminoplast resin solution with a viscosity of 300 cP 4- 49% of a 20% aminoplast resin solution with a viscosity of 10 cP + 1% surfactant ')

') Na salts of alkyl aryl sulfonic acids.

crowd
Parts by weight

1.0

0.8
0.8

0.4
0.4

0.4

0.4

water
Parts by weight

3.4

7.6

7.8

16.3

2.55
2.8

2.53

2.5

Flexural tension pressure

strength after 2 days
kgf / cm ² kgf / cm ²

80
75
71
62

92
87

87

84

349
329
304

272

434
381

373

442

An aminostriazine resin containing acid groups was used as the aminoplast resin in this and in the following examples used.

Example 2

24 parts by weight of sand (maximum grain size 5 mm), 2.4 parts by weight of rock flour and 8.4 parts by weight of anhydrite binder (premixed from 8 parts by weight of anhydrite AB 200 [DIN 4208], 0.32 parts by weight of Portland cement 275, 0.08 parts by weight) are dried in a compulsory mixer Potassium sulphate), water and additives (see Table 2) are then added and mixed until a homogeneous mortar is obtained. The anhydrite mortar is extruded through a 4 χ ^ cni nozzle. 4 days after production, the pressed strands are cut. Flexural tensile strength and compressive strength are determined. The results are shown in Table 2.

table

/ iiMi / average

2b 20 ", an aminoplast resin solution with a

Viscosity of 10 cP

98% of a 20 "» aminoplast resin solution j with a viscosity of 10 eP I + 2% tensici ')

Table 1 footnote.

water
Weight parts l) ic (JC / uu- pressure lic'uitjhtsteile fesUgkc I after A days 3.55 kp cnr 2.42 30th 0.4 2.37 57 0.4 42.5 kp cm no 310 258

Example 3

The following mixture was produced in a compulsory mixer:

58 parts by weight Portland cement 375, 12 parts by weight asbestos mixture from types 5,6.7

according to the Quebec standard test, 20 parts by weight of water,
1 part by weight of additive A or B.

Z'isatzmittel A consists of

99.9 parts by weight of 20% aminoplast resin solution with a viscosity of 10 cP and 0.1 part by weight of surfactant ¹ )

Additive B consists of

49.95 parts by weight of 20% aminoplast resin solution with a viscosity from 10 cP,

50.0 parts by weight of 20% aminoplast resin solution with a viscosity of 300 cP and 0.05 parts by weight of surfactant ¹ ).

After vigorous mixing, the mixture was extruded through a 1.7 × 1.7 cm nozzle. the The results are shown in Table 3.

Table 3

Similar good results can also be achieved with finely ground quartz sand.

Without additives A or B, the specified one is Niche not extruded a

Example 4

In a compulsory mixer, 24 parts by weight of sand (maximum grain size 5 mm), 2.4 parts by weight of rock flour and 8.4 parts by weight of anhydrite binder (consisting of 8 parts by weight of anhydrite AB 200 [DIN 4208], 0.32 parts by weight of calcium hydroxide and 0.08 parts by weight of potassium sulfate) dry mixed; 2.42 parts by weight of water and 0.4 parts by weight of Melment * L 10 ¹ ) are then added. Mixing is continued until a homogeneous mortar results. This anhydrite mortar is extruded through a 4x4 cm nozzle. The results are shown in Table 4.

Table 4

Additive-
millcl after
Bicycles
fcsligkcil Strengths in kp cm ² Days
pressure
strength at
game A. 52 I day
pressure
strength after 1
Bicycles
strength 289 3a B. 64 165 83 291 3 b 220 89

Without aminoplast resin

-

¹ I = S. Footnote to Table I.

With 0.4 parts by weight
20% aminoplast resin solution with a viscosity
by lOcP

') = see footnote to Table 1.

Strengths after 4 days

Flexural

strength

kp cm ²

28

50

Compressive strength kp-cnr

102

285

Claims (6)

Starch or the like can be added. These substances can be added to the anhydrite during grinding, if necessary. 1. Extruded molded body based on organic binders. The Austrian patent 205 400. Fillers and Amino- 5 describes a process for the production of lightweight plastic resins, characterized by building boards and insulating bricks made of a medium-fine anhydrite binder with a content of sulfonic acid groups. Brandy gypsum and water, an aminoplastic resin based on an amino, if necessary with the addition of fillers such as saw triazines with at least two NH ₂ groups. Sawdust .. chaff, reed, vermiculite etc .. as an additive as well as possibly further io whereby the mass is mixed with additives before the extrusion. and kneaded in a suitable device 2. Extruded molded body according to An must. claim 1. characterized by a content of further is in the German patent 812 414 0.1 to 5 percent by weight, preferably 0.5 to a method for producing components. 1 percent by weight of the aminoplast resin, such as roof tiles or the like, described in which net as a solid, based on the binding agent used - natural or synthetic anhydrite, possibly medium. made into a paste with water after adding fillers 3. Extruded molded body after a, whereupon the mass on extrusion or other of claims 1 and 2, characterized is deformed by conventional tools. a content of 0.01 to 1 percent by weight, 20 occur in all of the manufacturing processes mentioned preferably 0.05 to 0.1 percent by weight, one of the difficulties encountered when pressing anion-active surfactant, based on suitable additives used or certain grain sizes Binder, as a further additive. the starting materials are attempted to be countered. 4. Extruded molding according to a Another disadvantage of this process is that of Claims 1 to 3, characterized in that the products are sufficiently wet to obtain one he one or more binders from which the strength must be stored for 1 to 2 weeks. Group clinkers and cements, calcium sulphate, if you want to achieve high strength more quickly. Sorel cement and lime contains so the products with cement and / or lime must 5. Extruded moldings are aftertreated as a binding agent in the autoclave; Claim 1 to 3, characterized in that it is 30 for products with calcium sulfate as a binder Such an aftertreatment is also not possible for one or more fillers from the group. Rock flour. Sand, organic and inorganic The aim of the invention is to provide a fiber material contains. composition for moldings based on other 6. Extruded molded body according to an organic binder and fillers to entder claims 2 to 5, characterized. 35 coils, which are extruded well so that it can contain sulfonic acid groups as an aminoplast resin and also achieve a high strength-containing condensation product of an amino within a short time without the need to autoclave s-triazine with at least two NH ₂ groups. and formaldehyde, which is in 20 weight percent compositions, which have a content of min- tiger aqueous solution has a viscosity between 40 at least one acid group-containing amiiio- 3 and 50OcP contains. Plasma resin based on an amino-s-triazine with at least two NH ₂ groups as additives meet the required conditions. The invention relates to an extruded one 45 moldings based on inorganic binders. Fillers and aminoplasmic resins. The cr- The invention relates to extruded moldings, moldings according to the invention are characterized by ■ of inorganic binders. Fillers and a content of a sulfonic acid group. Additives. the aminoplast resin based on a ^ s amino-s-triazine It is already a process for producing 5 ° with at least two NH ₂ groups as additives formed asbestos cement products, according to which, as well as possibly other additives, a cement mix consisting of 1.0 to 60% L ^; > Is surprising that according to the invention by Asbestos fibers. 10 to 85% cement and 14 to 50% some additive both a good grouting V / asscr to ensure its plasticity and availability by extrusion as well as high Correctness during the molding process 55 Achieved early strength of the extruded molded parts «In hydromodifying agent is added (can be. Reichischc patent specification 256 689). Even small additions of the acid groups can contain the usual aggregate resin prior to the molding process, ie 0.1 to 5 percent by weight. like sand, to be added. As hydro- preferably only 0.5 to 1 percent by weight, modifying agents are organic substances with f * added to the agents used, range as a molecular weight above A (H). / B. Methylsatzmiltel from. wjbei the figures are on cellulose. Aluminum oxide polymer. Refer to Acrylamide-Acryl-Festhart. Acid copolymes containing acid groups. Polyvinyl alcohol can be used, among other things. Aminoplast resins based on an amino-s-triazine From German patent 814 421 is known from the German patent specification 814 421 that with at least two NH ₂ groups are preferential production by extrusion molded components fts wise commercially available liquid and solid resin from anhydrite-containing masses, the type used. This is sulfone mixing water of anhydrite small amounts of condensation products of molecular, glue-like substances containing high acid groups, e.g. B. cellulose ethers. of an amino-s-triazine with at least two NH ₂ -