DE1989338U - ABRASIVE GRAIN FABRIC MADE OF REGENERATED CELLULOSE FIBERS. - Google Patents

Description

Patent attorney % k OKt. 196?

2 Hamburg 70

Schloßstraße 112 · Postfad! 10914 File: 21o2Gbm

Remote call: 66 / rl "'

Applicant: REICHHOLD CHEMIE AKTIENGESELLSCHAFT Hamburg 7o, Iversstr. 57

Inventors: Hermann Singer and Dietmar Wunderlich, both in Hamburg

Abrasive grain backing fabric made from regenerated cellulose fibers

For the production of high-quality abrasive fabrics that are used in Form of sanding belts for machine sanding in the metal and wood processing industry are used in a variety of ways, cotton fabrics are primarily used. A twill fabric (2: 1) is used as the fabric construction. in question with a thread count per cm of 3 ^ / 2o.5 made of cotton yarns with a thickness of 2o / 28 m / g $ the fabric weight of the

sized fabric is approx. 235 g / m. Such a fabric has a breaking load of approx. 23 kp / cm in the warp direction with an elongation at break of 17% , while the corresponding tensile strength values for the weft direction are at a breaking load of 10 kp / cm and an elongation at break of 8 % . (Strip tensile test on textile fabrics according to DIN 53-857, the result obtained was divided by 5 in order to convert the 5 cm wide test strip to 1 cm.)

Since abrasive cloth is made up as abrasive belts in their direction of use, that is the warp or lengthwise direction of the Fabric, may only have a very low elongation., otherwise there is a risk that the sanding belts will move under the influence of the

Extend the tensile stress excessively and away from the contact disc running down the grinding machine, it is necessary to remove such fabrics during the finishing process to be subjected to a stretching process in the wet state, which is achieved by incorporating finishing agents after the fabric has dried is fixed. A finished abrasive backing fabric based on the type of cotton fabric mentioned above E.g. the following properties: (for comparison, the corresponding raw fabric is listed again in the right column).

Finished raw fabric

Fabric (desized)

Average weight per unit area 315 g / m ² 236 g / m ² tear strength in the warp direction 40 kg / cm. 23 kgf / cm

Elongation at break 6.5 % 17 %

Tear strength in

. Weft direction 12.6 kp / cm Io kp / cm

Elongation at break 2o % 8 %

It can be seen that the greater elongation originally present in the warp direction compared to the weft direction during the tearing process considerably reduced by the stretching and finishing process Tv, while the stretch in the weft direction was significant has risen - in other words: It was due to the stretching and finishing process in the Existing stretch in the warp direction partially moved in the weft direction. Has a fiber material based on cotton ideal conditions for strongly advancing it in the warp direction when it is wet. For cotton fibers or fabrics

namely, the elongation at the beginning of the tearing process increases considerably even with a low force, and then increases much more the tensile stress hardly increases, i.e. it It is possible to use cotton fibers and, accordingly, cotton fabrics by means of a wet stretching process in the warp direction to a large extent to equip with low stretch.

The disadvantage of using raw abrasive fabrics based on cotton is that they are relatively complicated must be subjected to prepared dry and wet finishing processes before they are actually equipped, i.e. can be finished. The reason for this is that one for the production of abrasive cloth Highly absorbent carrier fabric is required, as only these meet the requirements for perfect adhesion of the finish and Have binders on the fabric.

But cotton contains growth accompanying substances of a waxy and fat-like nature, which significantly impair the wettability and induce absorbency of the fabric and only through intensive, expensive finishing pretreatments, such as Desizing, alkaline boiling and cupping - each in connection with numerous rinsing processes - can be removed can.

There has been no lack of attempts to create abrasive fabrics made from cellulose "i.e. to be produced on the basis of regenerated cellulose. As far as it is low-quality abrasive fabric sheets for manual grinding operations, this will be

Already practiced with success for years. But so far it has not yet succeeded perfectly: Cell wool tissue; for high-quality abrasive grain fabric webs that are used in the manufacture of _; of abrasive cloth belts for machine sanding are: to be used .. This is related to the "that. have .. Also, their source value - better .Wasserrückhaltevermögen - ^much: higher than .Baumwollfasern Des weiteren.ist ^{known; that:} largely teinwirkung proportionality between Eraf in viscose staple fiber types and kicking elongation-iDeSvteht it j l "st... , therefore not possible ₃ the Zellwollge during the wet finishing; -; fix tissue by mechanical stretching zn with little stretch .. - ^; , r; _;

The latest developments in the field of have- but rayon materials; _Ä out the look "in her ;; dry as in their Naßreißverhalten very; äem; cotton nähern..Man may even find that ₃ .dle - ^ rOCkenfestlgkeit. of such cellulose materials is significantly "above that of Bainnwoi - Ie, while - their elongation behavior during / the; Tear; ' Process In: dry as in: TiaBseh: state -measurably with .- _: corresponds to that of cotton fibers. At. This stage of development of pulp fibers is fibers; from ^rege-: nerierter cellulose ^ insbesondere- the Po lynöBic group. die- .. within the ZellwOll technology a specific term ;; represents. (Re: to prevent ^ that :: all possible fiber types' - ■; regenerated cellulose as .poTynosisch referred _w.er-:;.

ON 2102 -

den, the Association International Polynosic (AIP) has made certain demands of a technical nature, those of Polynosic Pasern must be met.) It would be of general advantage in the manufacture of abrasive cloth Cellulose fabric made from regenerated cellulose, especially from the Polynosic group, should be used as a raw abrasive fabric, as this Due to their natural cleanliness, wet equipment is much easier to handle than normal cotton fabrics.

The disadvantage is that the conventionally sized warp thread Abrasive carrier fabric, due to the conventional sizing, anti-adhesive character compared to the later to be applied have conventional finishing binders and therefore traditionally have to be desized, moreover have abrasive backing fabrics made from regenerated cellulose, especially the Polynosic group compared to desized ones Cotton fabrics have a much greater absorbency and thus take up significantly more finishing agent, which in turn causes the Finishing process is made more expensive.

Furthermore, the tear resistance of normally finished abrasive raw fabrics based on regenerated cellulose, in particular polynosic fibers _{3, is} greatly reduced.

It has now been found that one can avoid the disadvantages described above, if an abrasive grain carrier fabric web of regenerated cellulose fibers, in particular the type of polynosic fibers are used, the same is characterized xvobei ₉ that

a) the warp thread sized and finished and the size and finish is firmly bonded without a boundary layer and

b) the weft thread has a finish: -; .--> .- -; * ;; / λ-. ;;; ■; .-;> ~ " ^v ,

A special embodiment of the sole corrugated fabric »; Bahn is "characterized by the fact that the warp thread is rait. a core size yarsehen Pages -564 -577 and No ... 12 -.Seite- _6if - ^ in the article on "Sizing agents for the textile industry"; γ. Erich P. Frieser.) '.-. / ^; -Λ: ;; ; _: ':' ■. ■ ': ■■ ^; ': ■■;>;■>."^;'.',;;;; . ■ ΐ- ^

In a "- further execution: Forin; ^Is:; the Schleifkornträger-: V ;; fabric web-characterized gekennzelchnetj since ^{^;} the _..: on; .dem _warp, weft ;; and b efindli before \ finish; transit dressing - with / - ■: / "- a finishing agent; ₉ ^; where:% m iräS) 3risö VIFE ^ _^^: emulslör - r; ^ _7; tes :. organic / solvent -contains _a r ^: which; at tempe-λ :%} ^: temperatures from .15 - ii5 ° G ^: a swelling agent, and over 55 / · - 2oo G -; ; ^r -. a solution center! for at ■ "d ^ m: -Kettfaden located: Sciilleh te ISTJ has been placed _.:: ^-: -: ^{_v::;. ί} · ^I;: ^ V -. ;:";. -

A belt of abrasive grain backing fabric produced in this way has the great advantage that the abrasive tissue treatment is adhesive; with the; core sized warp thread-uhd dBitt weft thread; fixed-: ί; connected is. -. ■ ". ■.;" - "". _; - '. - ■ '; ■ ■'"-'''■i-.rP'-L)': - ■ ' ^: _ -) ^" ^

With the production of the present abrasive grain carrier fabrics: - :. ; :; . beb ahn. there is the advantage that \ the ;; Finishing :: none ;;;; - f. High amounts of finishing agent are applied; -Do;,;: da ^": ;;; -.-;: ;;; by the new ^arrangement: the abrasive grain carrier fabric web: V.-a ~;; ^ the warp already kerngeschliehtet is>: ■ In addition wirü. achieves high elasticity of these;> - ^_-;;.; \ - ■■ -.I ;; - ■ _"■■";. "r.

As size for the warp threads, or ν preferred, core size: ^, ^:; -is for example usablei-degraded- starch and: starch-: __; _; . ;; ; ^: . derlvate _s synthetic resins based; of isocyanates ;, homo-: and /; ; ; or copolymeric acrylic compounds {butyl · ^ methyl acrylate:) ^ " _: 7 polyvinyl alcohol j polyvinylacetate, a'cryl-nit ^ l ^ butadiene-- -: '■', _. styrene mix-polyroerisate in the form of solutions or disper . ..: y emissions and appropriate wetting agent such as _9-;. Jiapiithalin y _'V; sulfonate, Äcrylderivate oder.'IthQxyaddukte ,;'. "- ~~ _{_:} :: -_ ■ ...; ■; ....--. : ■■; -. y / ']

Preferred Kernschllciiten _are: Polymepe, "based on acrylated" -. "■:; laten and their _derivatives: and: säureäbgebaute ^{StÄrkeprodÄik-":} _-'--: ~ \ te and Pettsäurekondensatlonsäthoxyaä;-products. _: - As; ■ finishing-; for v; : come the warp thread and for the weft thread; for example "- ^ _-;; ^..; _ infrnge: -tierischer":;: ;;; und'nicht: ■; hide glue and / or reaktlve. ': reactive copolymers ^ acrylate solutionsQde ^ aqueous ^ dispersers ^
nen ,, polyisocyanates, ^ polystyrene- ,; ^:]% Me.thylol -% rbIndünge; n _^of: ■ "■ _ _\:; urea derivatives and .seiner ;, ^aldehydes; and its --Derivate ^: - ;;;; ■ Sulf on _a nnectivity Phenol-Formal dehy d-Re so! Resins ₃ ^ polyvinyl - ;;:;: f ■ "." Alcohol j ^; -acetate and -chloride- In ^ - Föriai of dispersions; and: ^ ;; _- ;. solutions , epoxy and polyester resins and starch · ^ Stärkede -; ■ ■ ;;: / :; rlvate and Äthoxiaddukte _s which in - aqueous medium :. '- "_, ^v: y _\:. Emulsified organic solvents en thal part j soft spray · - ^: - -. - '■■ --_ - ■ Temperatures of 15 -: 45 ⁰ C a swelling agent · and above ^ 65 ^ - 2p: o-: C _: λ a solvent for "which is feBfindllchevSchlich-; ■ te on the warp thread" .% emulsifiable Suitable organic Xösungsmlttel ^{are:; λ;} : for example toluene, xylene, ethyl acetate,; ■■ ^ es ^ eö ^ », - * *! ^ -.-; -;]: ^^ chlorethylene,: perchlorethylene: ^ ^ Preferred ^ -finishing agents; . ^ ^; '' .- ■ '[ "are - self-crosslinking: copolymeric Aoryiatdlspersion ^ nj» -ins- -; ■ _: - - ■■:

special copolymers based on butyl and ethyl acrylate as well as methyl methacrylate in dispersion or solvent-based form.

By using the preferred finishing agents, the following special advantages are achieved, since the crosslinking acrylate dispersions also have good adhesive properties as a finish to the phenolic base resins to be applied later this prevents the tissue from becoming brittle. In addition, the web of abrasive grain carrier fabric can be provided with the same finish as on both sides of the web this is achieved by a dipping process or a double-sided coating process.

Example 1

A warp yarn of strength Nm 28 / 3o made from regenerated cellulose fiber (Polynosic type) is made in a sizing trough with a recipe consisting of

8o parts by weight more unlocked by acid degradation

strength
3 parts by weight of ethoxy adduct

917 parts by weight of water

core-sized and dried on a cylinder drying machine and then woven into a raw abrasive fabric. The abrasive raw material produced in this way is made without desizing with a finish consisting of

5o parts by weight of animal hide glue (3oo leaf size, loo mp) 100 parts by weight of a copolymeric acrylate dispersion 50 parts by weight of kaolin

3 parts by weight of naphthalene sulfonate 797 parts by weight of water

impregnated and with simultaneous stretching: with one side. borrowed spring-in of approx * H ₅ 5 $ dried .andwfixed.

A warp yarn made of regenerated Zellulo.sefaserri - (Polynosic type) of Nm 26 is placed in a sizing trough with a ^ liquor _s consisting of _ _: _: "..--. ^{R J}

12o parts by weight of reactive copolymeric "acrylate" dis- ^; ^.

5 parts by weight of water-soluble copolymer

. "'" - 3o % acrylic acid ₉ Jo% .butyl acrylate. .

875 parts by weight of water - "- '"' -.-. '. ; - ") ::

finishing and. then in the. Air duct at l4o: ^o C- '.;"■ dried and fixed. After weaving, the" raw abrasive fabric is immediately treated with a finishing solution consisting of -: - ^: -; .; -; . '. - ■■ - '■ "■' -. _Y __ _-: -_ -'-: / -

"12o parts by weight of reactive copolymeric acrylate dispersant,;.

. ■ 5 parts by weight of a copolymer from 3o - '%. Acrylic-. ... ■■ ;. acid andjo % : butyl acrylate ■ "-""■": ■. ν 2o wt *; - parts ■ toluene.;. ■■ -.- ■ -.-:. .- _v : ■ ". :. ■■ - '":." - ■

.-. 6o parts by weight of kaolin. .; ■ ";"".." - ■ "':: '-'_._.'_." ■ "." 2o parts by weight of dimethyloldihydroxyäthyl.enurstoff. - .; '".. 2 parts by weight of fagnesium chloride;. _: . _: ;.

773 ■ parts by weight, parts of water "." ■ "■". /. ■ ". '",., -. -: ■ '_ ~ - ^: ' - "'_ ---- impregnated and dried with stretching at IUo ⁰ G - the fabric jumps around in width ^: H ₅ 5.; ^ Eln _P and fixed.

As proof of technical progress, the after. Example 1 and 2 treated webs as follows :; - ■■ ;. ? A final line is then carried out on the punch side by means of. . Starch and crosslinking acrylate dispersion based on methyl-3-Ä'tiiyl ~ _s butyl-, methacrylate --- ₉ ", acr-y-ln.iti ⁾ ll-Bü1; aä , i "en ~ _i

Styrene and a spread on the grain side consisting of -..- a ca-./ polymeric acrylate dispersion and its derivatives and epoxy resin. A phenolic resin base coat is applied to the abrasive backing fabric prepared in this way, followed by ^: the abrasive grain and the phenolic resin top coat applied., .- "The abrasive belt obtained has an excellent bond between the basic impregnation and the finish."Λ; -.-. ".: /. ' ^:

The further treatment takes place / as indicated in Example 1. ; ' The abrasive fabric tape obtained shows a good one. Composite ,; "".,. good flexibility, high wet strength and good adhesion of the _; . Finishing on the unsized fabric. ^: ; _: ; -.

The inventive finished abrasive carrier fabric: ...; -... / is after impregnation according to the use ;:
purpose in the conventional way - - further treated in terms of finishing> eg "stamped and grain side coated ^ dried; and Aa - '■ .-;

To test the adhesive effect achieved, the -prepared-.; .. ■ te abrasive backing cloth with phenolic resin; primed ;; and then, electrostatically, abrasives ·; :.

(Electro corundum ... or silicon carbide) grain size 'No ;, ^ o.aufgeb: ...; brought and in the Hahg _: pre-dried or .. - ^ pre-hardened. Thereafter . ^: -; was with a plienol resin binder! · with corresponding -; -V-; Filler and dye additivesodi © second top binder- .- -telayer applied and the entire system- again '.- im- · "-" -..- "., ■;"', 'Hang .dry and then hardened ¹ . ^ After the hardening process. the abrasive medium carrier fabric was used as a.

■.: '■.: ■■■' ■ ■ "■■ '." ■■■ ■■ "': '■' ■ - Il - ■ '■■'. - ■■■" .. ': ■ '- r .'- ■■ ^-';: - ^-:

V; ': ■■ ".... '. ■ - ': _ - /. ^ .-- H- / - _; V .: - \ ν-χ ■ /. V; 3 ;;. ^; : ; /; 3 ^.: 3 Establishing its .hygroscopic equilibrium; in humid - // X / ■ air, atmospheric air conditioning and then. Rolled up *. 3 <-. // ~ 3: J / -; ■. ■: / Then the "abrasive fabric produced in this way - a mecha- {_. _; -niche breaking process - in -der TechnOlogle; the abrasive cloth- "production is called" plexen ". - subjected - and processed to - ^: ;; _ / ' abrasive cloth tapes» These were on a- -Band-: - ^; - ■; -'"" grinding machine au T ^ i .. stretched and tested in ^{Prüfsclileifvorgang;;} ^ in this test _schlei: f'Vorgang was a "-erfindungsgemäß her-r _^.::::" "posed Shabu with einem.herkömmlich ^{geschiiehteten:} - then not entschliehteten and then lierköinmlich appre Abrasive backing fabric test abrasive technical comparison., With constant pressure load, the abrasion was made of .a-:: ~; / K defined iron tube. carried out-. -Furthermore, the "surface ;; 'v of the abrasive fabric after the test grinding process. - with regard to: -:':": / _; ; Abrasion "and grain breakage visually" appraised , - As ^: value measure -; . ¹ ^: .- _"-): In each case the rod-e ^obtained: - grinding time for -biis ^: yölligen; ^;>-:;. .Ausbrechen of the abrasive grain, ■ ^ Furthermore Wurd; e: the adhesive strength; .: -; the Schleifgewebeappretur dHrch applying a phenolic ^resins;;>: -> intermediate layer and this -LAMINATING ^; sample: by: _les:: ':':::; ~ i same phenol resin tested for sheet - the Prbbevwurd e:., - -: - ^;;: r cured, and after; completion .Klimatisierung were; dle -, - ■. .-, -: -: -: [; peel strength as well as: point of Ab peeling, determined =: _\: ■■■: [ ^'-: - ■...'■; - 'Bandschleifma ^~.:

.schine. Kornaus ~.
break of tissue
after: / ■■>'.;; ^: -. .;

; Peeling ^Λ Peeling attempt: % done /:

Conventionally closed: te Schleif'gewetoe / not desized and conventional / conventionally impregnated

According to the innovation, arbitrated Abrasive cloth with er. arbitration according to the invention and finish impregnated., ..

Minute ^:

kg: / ..: between - ': ■; ^: ' ■ ' [: ■ - .... - ^; Schlichta _: / and .--

'· -: ■■: - / ■ -, "" ■ - / finish ⁵ . V / ^; .

12 minutes /. 15 kg

between; ^; /-.'.- ./ / phenolic resin and /. Finish '/, / ^ /

The tests show, that the abrasive grain carrier fabric according to the present innovation in several respects are surprisingly improved. The abrasive grain carrier fabric web according to the innovation is illustrated by the drawing.

Figure 1 shows: under A the core sized and finished Warp thread A without boundary layer and the finished weft thread B.

Claims (3)

2102 Gbm 24, Octm? ^ Protection claims ιΪΑ. G 1 (J ί 7fJ * 25 ff? F7 1. Abrasive grain backing fabric made from regenerated cellulose fibers, in particular of the polynosic fiber type, characterized in that a) the warp thread sized and finished and the size and finish bonded firmly without a boundary layer is b) the weft thread has a finish, '- ~ - 2. Abrasive grain backing fabric web according to claim 1, characterized in that the warp thread is provided with a core size. 3. abrasive grain carrier fabric web according to claim i or 2, characterized in that the padding located on the warp and the weft contains by padding with a 'finishing agent, which emulsified in the aqueous medium organic solvent which comprises at temperatures from 15 to 45 ⁰ C, a swelling agent and above 65 - 2oo ° C for the size on the warp thread has been arranged.