DE1694796A1 - Fibrous molding compounds - Google Patents

Description

DR. ING. F. WUBSTHOFF DIPI-. UiG. G. PIJXS DH.E.T.PJBOHMAN; ii

PATENT LAWYERS

_ "DEBS

SCHWEIGEESTRASSE 22 06 01

ΡΒΟΙΙΟΤΡΙΤΪΪΪ Mt) IfCHIS

365

B e a ο h r e i b u η g to the patent application

Progil

77, Bue de Miromesnil - Paris ^(8e) Prankreioh

concerning - ■

Fibrous molding compounds

The present invention relates to molding compositions that made from textile fibers and sole waste as well as a process with the production of these molding compounds * '-

It is known that when using and the machining of foam plastics »imraei» Waste of various shapes and sizes, which represent a relatively high loss »

109847/1854

. - 2 - .lA-33 365

Attempts have already been made to utilize this waste profitably, e.g. by bringing it to a Solvent and by kneading with an elastomer, which causes the waste to stick together and to re-form of foamed foils *

A new possibility has now been found * to recycle such waste usefully by / they are used as the starting material for the manufacture of

.- ■■ -.- .. ■■. ■:. , ■ ■; ■ ",

^w masses are used that can be used in a wide variety of areas /

The present invention therefore relates to Formmas sen i consisting essentially of a mixture of comminuted to the desired size foam waste, textile fiber and a binder composed ^ that connects the first two components into a cohesive mass *

The foam waste _f / which are used to produce the molding composition according to the invention must be quite small so that the finished product has sufficient homogeneity. It has been shown that multicellular particles, the main dimensions of which are between 1 and 5 mm, correspond excellently to all uses according to the invention.

- ■ 3 109847/185 4

1,3- ■ 'iA-33 365 ¹ 694795

All common Schauni fabrics are suitable « An example are: foams on the base of polyolefins, vinyl polymers such as polyvinyl chloride, polystyrene, phenoplasts, aminoplasts, natural and synthetic rubbers, polyurethanes.

In general, all natural, artificial or synthetic textile fibers into the inventive Molding compounds are incorporated, e.g. cotton fibers, hemp or jute fibers, acrylic fibers, Polyamide fibers, polyvinyl fibers and more. With rayon, especially in the form of 10 to 30 mm long fibers of 15 to 50 denier will be excellent Get results.

The binder used according to the invention must be compatible with both the foam and the fibers. Its texture influences the quality of the finished product. In general, polymerization products are used, such as, for example, polymers or copolymers based on vinyl, acrylic or styrene, preferably in the form of their latices. Advantageously, latices of styrene-butadiene and acrylonitrile-sfcyrol-butadiene copolymers or latices of acrylonitrile-acrylic ester copolymers are used which give the molding compositions according to the invention a good bursting strength. 10 984 7/185 U

IA-33 &

The amount of binder to be added to the molding compositions is not critical. However, it has been found that in general a proportion of 8 to 15 % , based on the dry weight of the total mass of foam and fibers, is sufficient.

The proportion of the other ingredients can be fluctuate within wide limits. It must be chosen so that the end product is suitable for the drawn use has desirable physical properties.

So gives ζ »Β. A predominant proportion of foam waste (55 to 70 %) gives the finished molding compounds a higher elasticity. However, receives

he
, if one increases the proportion dei ¹ fibers, especially when incorporating a rigid and stronger material than fibers spun rayon. In addition, the bursting strength of the molding compositions according to the invention is increased if fibers with a higher denier are used »

Can continue to enforce according to a modification of the present Irfindung the basic masses even more certain substances to both their properties ale also their appearance. to enhance. These

109847/18 5 4

Additives are essentially resins, especially phenolic resins and amino resins, e.g. urea-formaldehyde resins, which the moisture-proof wedge; improve the end products, as well as paper waste or fibers. The latter generally accumulate on one surface of the mass, where does it go? Page a smooth, shiny and unity! Iohes' Appearance. ■ ·

Considering these variables cups see with the novel molding materials iaifc very diverse properties herBia !! "" * When making eg railways, stripes or bands, U & m their appearance all levels between a slightly en und.relativ flexible plate and a virtually accept rigid plate or foil * The thickness of such foils or plates can be 1 '' ■ · * 3 mm _; wear and their weight is between 200 and ¹ ^ Q g / a * Their advantage is that they are lei'Oht and at the same time have good tear resistance and good crush resistance Interest.

109847/1854

- 6- 1A-33 365

The erf indungsgemässen molding compounds can be applied to many different ways ■. Ale example is the use of scaled-aJLsWan &

dung »floor coverings, molded packaging material _# accessories for interior fittings in power products * sound-absorbing ceilings etc.
Textile fibers and optionally

proved zweekmässig (they are iil rope -.% indicated "in relation to AEEN solid under Äusschiu8 the binder> i

Wall cladding! Polyurethane 25 %

j Viscose wool with a low denieri 35 ! ■■ "paper fibers (new or old paper)

■■ · ■■ "■

^w flooring polyurethane $ 50 to $ 60

High denier rayon 30 to 40 % paper fibers $ 0 to $ 20

Shaped packaging material (e.g. for eggs) Polyurethane 50 to fO%

High denier rayon 20 bis

Paper fibers 0 to 30 %

109847/1854

- 7 -; .- ■ 'lA-33 365

Automotive industry

(Car accessories) Polyurethane 30 to 50 % '

Rayon ftilt low denier ko to paper fibers O bit to%

Snap-on or

sound absorbing _ '

Ceilings polyurethane 60 to 70 %

High denier 30 to 40 # linseed yarn

For this latter use one can use a Make material that weighs 500 g / m2 and is through Bonding of two panels Ä E50 g / m is obtained *

As already mentioned, a resin, in particular a urea-formaldehyde resin, can be added to all of these molding compounds in a quantity of % - ip % , based on the iron-weighted foamed material fibers and paper fibers, in order to increase the moisture resistance.

In addition, the sheets or foils, which contain paper fibers and therefore have a smooth surface, can be provided with various coatings, c _# Bi po ^ iri? Inyitihläi * id.

-8th "

10S84T / 18S4

: ■ ... "■. - 8 1. U-33- 365 \

These molding compositions are produced in accordance with a method which is also within the scope of the present invention.

This process consists in that separately from one another an aqueous suspension of textile fibers and produces an aqueous suspension of foam waste particles, optionally with the addition of paper fibers, these two suspensions mixed together, the Mixture then adds the binder and optionally the resin and then the binder on the fibers and the foam tissue with the help of a suitable agent precipitates * The mixture produced in this way only needs to be evacuated in a manner known per se, e.g. by any paper machine, molding press or the like to be led *, Jv.

In practice, the suspension of the textile fibers is prepared by dispersing the fibers in water with agitation to eleventh suspension of 5 - 10 wt -. To get $ of fibers.

The Susjjensiöii of the foam particles can e.g. * in one Dutch made flocks. The visual foam waste of any dimensions and shapes are thus placed in the water. filled Dutchman | that the proportion of foam - i - 3 Gew »« |! which makes sneering. You let the Dutchman work,; The visual foam waste becomes particles of the

^{; ;} 109847 / 18B4

- 9 _Γ .: '.'-. LA-33 365

desired size are shredded »Then, if necessary, paper fibers are added; According to; In a modification, the foam waste can first be shredded in a tiOOkenem way up to the size of cm and then further in a Seheibenstofffflühle (raffineur a disques) "

The two suspensions are then processed in a paper machine of a known type "z * B" in a Misohq country mixed with the thickening agent while stirring. This is then with the help of an agent such as aluminum sulfate, illuininiunichlorid, etc. *

When you get ribbons _for webs or gels. one lets the mixture through a Lanjgsiebisasciiine _ _ψ "or through a 2ylinderiaatoMne ibwfesa * The irersohiedenen:

- '■■ - ■. - ■■ {■ - "■ - - ■" - '"- ■ -" ■ - ■ Rollers of the machine are on vtisöiltedenön; tempered: those from the first to the last falae suiiehmen, ζ. B * rise from 80 to IHO ⁰ O, with the roller on the VulkanisatidnstSOTpe ^ atui? which is heated, '*

The invention is explained in more detail with the aid of the following examples. / ^: ι * ^ *. - ^v :

-. 10 *

LA-33 365

example 1

A Dutchman filled with water was gradually filled with foam waste in such an amount over the course of 20 minutes that the finished suspension contained 2% by weight of foam. The Dutchman was then allowed to run for about 20 minutes in order to tear the polyurethane foam into pieces about 1 mm in size, each containing 15-20 cells.

Separately herev «» · were in a turba dissolver (hydra-pulper) an aqueous Eellwoli suspension with 6 wt% dry matter manufactured!" The rayon consisted of equal parts of 15 mm long F & serji 15 den and 20 mm long fibers 40 den.

Then the two suspensions were prepared in an amount equivalent to 4 wt - $ dry matter introduced into a mixing Dutch · *.

The various components of the mixture distributed as i

Polyurethane particles 6ο | ί rayon 15 denier, 15 mm
Zollwoli © 40 den., 20 mm

- it - ^1A " ³³

Thereupon 10% by weight, based on the dry weight of fibers and foam, of a latex of a styrene-butadiene-C © polymer and 5% by weight, based on the dry weight of fibers and foam, were added to the slurry insulation. Urea farmaldehyde resin added. The mixture was stirred for about 5 minutes and a small amount of aluminum sulfate was added to the mixture, which deposited the latex on the fibers and the foam particles. The mixture was then run through a Fourdrinier machine, the 6 rollers of which were heated to 8O ⁰ G, or 80 ° C, 90 ⁰ C, or 95 ° C, or 10 ^ 5 ⁰ G and 110 ⁰ G, the Vulcanization of the latex takes place on the last roller.

A fibrous molding composition was obtained, as follows Features like:

Weight 260 g / m ²

Thickness; 1.2 mm

Tear length: lengthways 2600 m

Cross direction I300 mm Burst index envelopes * 12

- This molding compound is quite elastic and suitable excellent as a flooring material.

109847/185

16947JS

_ ₁₂ _ LA-33 365

Example 2

The same procedure and the same conditions were used as in Example 1 and a suspension with ^ fo solid was prepared, which was composed of:

Foam particles. 50 wt -.%

Fibers of the Saillat pine 20 wt. Spun rayon 40 denier, 20 mm 30 wt. 4

Then, the mixture of foam and fibers were based on the dry weight of 10 wt. ~% Latex of a styrene-butadiene copolymer is added and precipitated with the aid of aluminum sulphate "

The molding compound had the following physical properties

Weight: 350 g / m ²

Thickness: 1.38mm

Tear length: lengthways 2100 m
Cross direction 1100 m
Burst index Mullen: 9

The material is excellent for making molded packaging or flooring be ο

108847/1854

"""," Claims / 22353: - ""

Claims (1)

SSB 2 XEI-EJi ¹ ON 22 OU OX TULEOHAtlJIADHESSE: ΡΒΟΙΕΟΤΡΑΤΕΚΙ MtKOKEJf LA-33 305 / 3 Claims 1. Fibrous molding compounds, g e k e η η - drawn by a mixture of heavily crushed Foam waste, textile fibers and a binder. 2. Molding compositions according to claim 1, characterized by a content of polyurethane foam waste. - ■■ 3 · Molding compositions according to claims 1 and 2, g e mark chnet by a content of zel • wool fibers. U molding compounds according to Claims 1 to 3, characterized by a latex as binder, preferential prices by a latex of a styrene-butadiene copolymer. 109847/1854 1694736 - ? - IA-33 3 ° 5 5. Molding compositions according to claim 1 to 4, characterized by the addition of Paper fibers. 6. Molding compositions according to claim 1 to 5, g e indicates by adding urea-formaldehyde resin. ?. A process for preparing the molding composition according to claim 1 to 6, gekennzeichn characterized et y that an aqueous suspension of textile fibers with an aqueous suspension of comminuted foam waste, mixed together optionally with the addition of paper fibers, followed by adding to the mixture of the binder and optionally the resin , the binder precipitates and the mixture obtained is formed in a manner known per se. 109847/1854