DE1769048A1 - Process for the production of microporous thermoplastics - Google Patents

Description

inventor

Waldfried Schubert _{Ir7cnn / O}

Walter Schumann I / Ό α U η ο

Process for the production of microporous thermoplaa * iaohan

Synthetic materials

The: ürfindung relates to a method for the production of microporous plastics, especially those that are used as coatings in the manufacture of synthetic leather materials You can use exchange material under To » Help from nanipu = common in the synthetic leather industry lations with the production of leather exchange material high water vapor permeability ,, good mechanical properties = switch and despite the wacser repellent effect »

The creation of microporous art t; to: £ be stratifications Much has been made in patents for replacement purposes and publications I use the best technologies brocaener coatings. The film is interrupted either afterwards through perforation or already during the coating through application of structured ßchiohtträger, which only coated in the recess are achieved »This also confirms procedures where the Bes stratification In Vupferfora not in closed Gliche or = episode. Numerous other procedures give dj3 application of Blowing agents to create pores during film formation an · UIe previously mentioned Biethoden aim at with using the simplest possible technologies,

Another method is based on the admission of in the Besciierungsmasde insoluble salts, which, however, after the Filmoildung must be removed · Uaoh t.the same Principle can auoh löelioh · fibers in the Bosch direction a ^ embedded and also subsequently removed. Bs are still trying to ciikroporöüe Kun; .tovoffe through ßintirn von Pulve?: n or vob Di.por ^ ionon after dt, a drying heart is ollen · The transfer of these technologies to However, ticcie disc replacement materials came across as a result

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f, end © »θch.'aulache Föstigkeiton on vnia ^ n All procedures mentioned so far ίϋ'ατο «<* u / krt'viöni not; ao fine porosity that trot-s good 'tfa ^ avrdampj

also a® su stroking © W'asasrrlichiilr; \: s3t gowühi?. ''..> ·: ', Ut ^ is. · The per on are Iw Gtogeatoll ao coarse »da £''' uaasr easily produced by dia so Products durated _: In Ic fixed time were Vsrfahreo. known, iwuih dexwm microporous layers are produced by coagulating Kuiiat-8t · i. '£ solutions - for the 53e kind; before · procedure ei * w3st Polyurethaa as ßohstcff baaondsra Οι »coagulate? jor! In the separate arbelta ^ ang, according to mnuisteii Er · * ^ kenRt.nis ^: m, unigohen, Indians. ' dan an or KiU '. ^'; ntof i'löaung »

al * Gia relatively easily flawedea l -:>'oungamitt.al © nthkit, ο in OJi achwer fugige N ichtlöaor aafiigjt «Io ■■! i ^ s ^ iu''cVll muss ■aliani'dinga dai * liic ^ tlösor in οΐ ,: \ οια we j tor -s "work processes eg by washing up" / iatfarnt w * vuim ... üi "au 1 ^ t at ^ e nan nt" n procedural stirring zn ftraeu & niciäaü lai "guton Wuoufc-rc-anjpfdurclivlassic-iföit -JXi as a result of gleicbrr-iu.lftav and fine porü: ni '-. Ät ₀ where.'. »Jl ^ iciiJisltig sufficient nuvchanlsciiD ^ © .i'U- and sufficient- · - do Waeaardhaftigkeit eraialt; -y ^ rdar. ■ iäin m \ ta chi; id end ar HachtoU. In the case of dlesöfli procedures, however, the use of solvents “which are generally flammable and physiologically effective. Because of the high expenditure required as a result, the products are expensive

The purpose of the present invention is "a alsT ^ derauetauech"

material to produce usable liraeugnia _β «ι» '.choa which b «i the bieharipen process does not have the disadvantages shown _v; λ TechnoJ.ocie du.i'ch the non-use of solution .veaentlJcb is pre-simplified and still a good i.-üp.t ^p throughl; "josigla> 1 i; and high meclianiaoho value" are found Ea WU vd-.v _and that are thought to plastics to sow "β köirtdu, welciie at b-astJmmten ßed.lngungou hoioo ^ s e.inmiecheu? .οβοοη _β ^ whether Uiich t he-Somponenton il-ouch atm unvortr-UK-HCl fffn- 1 Hv int boiepialawdise polyvinyl chloride (PVC) with

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Glycerine just as incompatible as dloctyl phthalate with? Glycerine Idese TJuveyfcraglicb.ksii; has inevitably led to In previous experiments, glycerine was at most in Very small proportions of up to 10%, based on PVC, are recommended in order to ensure that the inherent hydrophilic properties are retained to improve hydrophobic PVC-

It has surprisingly been found that, under certain conditions, temporary compatibility can be achieved between the incompatible components. For this purpose, the plastic intended for porosity is mixed with one of the respective chemical compositions of the water-soluble substance to be described and brought to a certain temperature , the water-soluble substance is intended to be a low volatility _s d _e h ~ to the boiling point over the m

Processing temperature of the plastic. He should continue Liquid at processing temperature of the plastic and, as already mentioned, under normal conditions with dec plastic incompatible components. Suitable substances of this Type are glycols such as ethylene glycol, butylene glycol, octanediol, polyglycols and glycerine and hexanetriol u ^ a-.

When mixing in large amounts of the incompatible water-soluble Components step into the plastic base mix according to the experiences made, there were difficulties to reach the temperature range in which unstable compatibility exists, homogenization does not take place *

It turned out, however, that when using soft PVC as {

Plastic the water-soluble substance! Easily in the PVC paste can be distributed in emulsion form «The emulsion form remains up to the homogenization temperature and after heating the PVC paste, which contains a hydrophilic substance, what remains is a homogeneous body in an unstable equilibrium * high before the substance is released because of it the presence of the unstable equilibrium is exuded cooled down and then immediately washed out with water. In order to accelerate the washing out, it is advisable to err with increased Temperature or in a boiling water

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All general guidelines for carrying out the procedure when using soft PVC, the following information can be viewed be a

An FVC paste is produced in a known manner by homogenizing and ripening, the limits of the PVO 2SU plasticizer ratio and the type of plasticizer not being decisive for the process, 30 that they can be varied according to the required properties o After the pasta has been prepared the water-soluble, non-volatile and at least at processing temperature liquid, PVC-incompatible substance is added. This substance is distributed by vigorous stirring, as is known in the manufacture of emulsions. ₉ Di amount of hydrophilic agent that should zwactenäßigerweise be liquid at room temperature is, after each. Formulation of the paste and, depending on the desired degree of porosity, 50 to 200 parts and more to 100 parts PVC,

The resulting coating slip can be applied in the usual way to the substrate or, if the reverse method is used, to release paper and the like. After the film at 150-200 ⁰ C, the material may be directly embossed or smooth, has been provided ηloht embossed release paper used or the like. The material is then washed out immediately.

The following application examples are intended to enhance the performance of the described Procedure are explained without restricting the further options available to pronounce "-

example 1

100 parts by weight of PVC with a K value of 70, a Λ-.ulga-

A gate content of approx. 1.5 % and an average grain size of 3 - 5 are used with 70 parts by weight of dioctyl phthalate

pasted. 100 parts by weight are added to this paste with stirring Glycerine mixed in. This mixture is made with a doctor blade

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Applied to a fabric in a thickness of 0.5 µm and then treated at 170 ° for 5 minutes in still air. The material is then washed out for about 15 minutes in boiling water with constant movement and then dried in air at 100 °. The film formed has good microporosity and good mechanical strength. The water vapor permeability is approx. ₀ 500 mg in

Hours, based on a test area of 10 cm “Bai of the test the material is on fatigue strength in the Bally flexometer still flawless after 50,000 bends *

Example 2

100 parts by weight of PYC with a K-tfart of 66, one in Sinulga-

gate content of approx * 3.5% and a middle ^

leren core size of 50 u are used with 80 parts by weight of dioctyl adipate

pissed off and stained with 5 parts by weight of egg oxide brown. 125 parts by weight of glycerine are mixed with this mixture while stirring. This paste is applied to a siliconized fabric with a squeegee, then heated at 170 ° for 1 min using the nozzle η air. After leaving the vulture channel, the coating is separated from the follower and washed out in boiling water ₃

The film obtained shows the following values) Dicket 0.4 am * WaiaerdeuBpf read through activity 530 mg in 24 hours, based on

a test area of 10 square centimeters. I.

When testing for flexural fatigue strength in the Bally- ^ lexometer The material still iates perfectly after 50,000 bends.

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Claims (1)

17690 ^ 8 Patent to speak 1 «Process for the production of microporous thermoplastics, especially films for synthetic Leather from dewing materials, characterized in that to the Kunststoffanaatz an addition of water-soluble, non-volatile and under normal conditions with the approach incompatible substances made wild, which after temporarily a labile, but stable mixture during the Processing period had formed, are subsequently washed out c 2 »Method according to claim 1, characterized in that the addition of water-soluble, non-volatile and incompatible substances under Hornal conditions in a mixture φ colloidal torrn occurs as it occurs in plastisols and enml- _ sions is present and the deformation is carried out in this form will. 3. The method according to claim 1 and 2, characterized in that the addition of the water-soluble, non-volatile and Substances that are incompatible under normal conditions are made into PVC paste, which is further processed in a known manner and then subjected to a washout process., 4. The method according to claim 1 to 3, characterized in that that as additives in water-soluble, flower volatile and Glycerine, an incompatible substance under normal conditions, is used "3 · Method ornoh claim 1, characterized in that the plastic content with the addition of water-soluble, Heavily cursed and, under normal conditions, incompatible material thermoplastically veifomed and then is washed. 009 * 36/21 * 7