DE102020105849A1 - Polymer composite and manufacturing process for it - Google Patents

Abstract

The invention relates to a polymer composite made from a matrix polymer and zinc oxide, the tetrapodal zinc oxide being contained in fragments and in a concentration between 0.03-0.5% by weight in the polymer composite polymer composites according to the invention.

Description

The invention relates to a polymer composite made from a matrix polymer and zinc oxide and to further polymer composite production processes, in particular for the production of a polymer composite according to the invention.

Thermoplastics are obtained through polymerization. During this process, monomers combine to form a macromolecule, the polymer. The polymerization is started by activating the monomer, for example by supplying heat or high-energy radiation, by increasing the pressure or by using catalysts.

Polymerization-induced phase separation due to different polarity between monomer and polymer systems is known. This effect is partly desirable for a controlled morphology. If this is not the case, antiseparation additives can be used. However, these often also take part in the reaction or influence the micro- and nanostructure of the polymers.

Subsequent addition of these antiseparation additives to fully reacted polymers such as thermoplastics such as polyethylene terephthalate can also lead to an improvement in the mechanical properties of the polymers such as tensile strength or even tack.

From the prior art, zinc oxide, in particular in tetrapodal form, is known as such as an additive for polymer improvement. Tetrapodal zinc oxide is usually added as an additive in the production of plastic and rubber and, thanks to its “crow's foot” shape, causes mechanical anchoring and more even force distribution in the composites.

Chinese universities and companies in particular have used tetrapodal zinc oxide in various composites in recent years.

In the pamphlet CN 104419198B A flame-retardant, antistatic, continuously long glass fiber-reinforced, high-temperature-resistant nylon composite material and a manufacturing process for it are described.

The pamphlet CN104592536A discloses a method of making a tetrapod-shaped zinc oxide whisker / natural latex composite latex film.

The pamphlet CN104725761A discloses a manufacturing method for a new ABS resin based material.

In the pamphlet CN104788780A a polyethylene tear film and a manufacturing method therefor are described.

The pamphlet CN105623248A discloses a polyamide composite and a manufacturing method therefor.

From the pamphlet CN107501700A a processing method for a motor vehicle soundproofing material is known.

The pamphlet CN109181085A discloses a reinforced plastic masterbatch for a low shrinkage thick walled polypropylene product and method of manufacture.

The pamphlet CN1927933A relates to a modified atactic polypropylene resin.

In all of the publications listed above, tetrapodal zinc oxide particles in the form of zinc oxide whiskers are used without further processing.

The pamphlet EP 0 325 797 A1 discloses, for example, zinc oxide whiskers, the crystal structure of which has a central body and four needle crystal projections extending radially from this central body.

The pamphlet EP 2 550 241 B1 however, describes cross-linked tetrapodal zinc oxide. Three-dimensional networks based on the interpenetration of crystalline tetrapod legs are formed.

The problems in the prior art are essentially that the classic plastic reinforcement is carried out purely mechanically in polymerization. A high degree of filling of complex geometries such as fibers is required. In addition, no additives can be added for the subsequent reaction of unused monomers.

So far, no inorganic emulsifiers are known for the chemical reaction during the polymerization of two or more liquids in food technology.

The present invention is based on the object of providing a polymer composite with which the mechanical properties of thermoplastics can be improved by adding an additive to the extrusion process can. In detail, a higher mechanical strength of the end product as well as reproducible properties should be achieved through the reaction of unreacted components, such as, for example, lower unwanted stickiness of the freshly extruded plastic.

In addition, in the chemical reaction during the polymerization of two or more liquids, the additive used as well as the emulsifier should achieve improved mixing, which in turn optimizes the reaction of two differently polar, immiscible liquids. In this way, the reactions should run much more reliably down to the micro level. The better mixing should also improve the material properties such as reduced stickiness, more consistent glass transition and higher tensile strength. The degree of additive filling should be kept as low as possible and the additive should not take part in the reaction.

This object is achieved with a polymer composite according to the main claim and a production method for it according to the independent claim.

The polymer composite is produced from a matrix polymer and zinc oxide, the tetrapodal zinc oxide being contained in fragments and in a concentration between 0.03-0.5% by weight in the polymer composite.

The zinc oxide in fragments is particularly preferably tetrapodal and / or multipodal and / or needle-shaped and / or sail-shaped zinc oxide. It is very particularly preferably tetrapodal and / or multipodal zinc oxide, this being the easiest to break and forming corresponding fragments. In particular, the zinc oxide should be easy to break or break through.

In particular, the zinc oxide fragments are designed as zinc oxide microcrystals or in microcrystalline form.

The invention described here thus comprises a polymer composite with increased tensile strength and increased stress relaxation rate, which was produced by adding tetrapodal zinc oxide by a specific processing method.

Increased stress relaxation ability can in particular reduce the negative effect of crack nuclei and reduce the breakdown of local and temporal mechanical stress peaks in the composite.

Apart from this, in particular microcrystalline, tetrapodal and / or multipodal and / or needle-shaped and / or sail-shaped zinc oxide in fragments, no fillers are known which have a homogenizing effect when added so little.

As standard, glass fibers or carbon fibers are added to the polymer to increase the tensile strength, but this reduces the stress relaxation rate, making the material more brittle (cf. Obaid et al. 2017).

The correct addition of tetrapodal zinc oxide in concentrations between 0.03 - 0.5% by weight can increase the tensile strength and the rate of stress relaxation. This becomes visible during the tensile test in the polarization structure.

The reduction of crack tips and the reduction of stress relaxation at micro and macro cracks promotes the mechanical durability of the polymer under static and dynamic loads. For example, the effect of shear, shear and torsional forces is reduced during loading, which can considerably increase the service life of mechanical components.

Furthermore, at least one side of the tetrapodal zinc oxide present in fragments can or is preferably designed with at least one characteristic of a classic brittle fracture. These are in particular the formation of terraces and steps on the surface.

The zinc oxide fragments can also be designed in such a way that they have high-energy fracture facets and low-energy side surfaces.

In addition, the zinc oxide fragments can furthermore have a crystallinity which is higher than what is referred to in the prior art as microcrystalline and / or nanocrystalline, and / or / or the zinc oxide fragments can be in the form of monocrystalline fragments.

The zinc oxide fragments can in particular be present within a size distribution between 100 nm and 100 μm.

Furthermore, the zinc oxide fragments in particular can have an aspect ratio> 3.

• - erhöhte Spannungsrelaxationsrate im Vergleich zum ungefüllten oder mit klassischen Festkörperadditiven und/oder Glasfasern / Kohlefasern / Kohlenstoffnanoröhren;
• - mechanische Verstärkung im Vergleich zu ungefülltem Kunststoff oder mit Additiven gefüllten Kunststoffen;
• - homogenere Eigenschaften in Bezug auf Glastemperatur TG und/oder Streckgrenze und/oder Zugfestigkeit;
• - Reduktion der Klebrigkeit im Vergleich zu ungefülltem Kunststoff oder mit Additiven gefüllten Kunststoffen;
• - enge Abstandsverteilung der Partikel im Matrixmaterial, entgegen der zu erwartenden Normalverteilung.

In particular, the polymer composite has at least one of the following properties:

• - increased stress relaxation rate compared to the unfilled or with classic solid-state additives and / or glass fibers / carbon fibers / carbon nanotubes;
• - mechanical reinforcement compared to unfilled plastic or plastic filled with additives;
• - more homogeneous properties in terms of glass transition temperature TG and / or yield point and / or tensile strength;
• - Reduction in stickiness compared to unfilled plastic or plastic filled with additives;
• - Narrow distance distribution of the particles in the matrix material, contrary to the normal distribution to be expected.

• - thermoplastischer Kunststoff,
• - polarer Kunststoff
• - elastomerischer Kunststoff
• - duroplastischer Kunststoff.

The plastic of the polymer composite can in particular be selected from the following group:

• - thermoplastic plastic,
• - polar plastic
• - elastomeric plastic
• - thermosetting plastic.

The plastics can in particular be formed by polycondensation or polyaddition with at least one polar individual constituent before, during or after the polymerization, or they can have a polar group.

• - Herstellen eines Compounds zur weiteren Verarbeitung, wobei zu einem Polymer zwischen 0,03 - 0,5 gew.-% tetrapodales und/oder multipodales und/oder nadelförmiges und/oder segelförmiges Zinkoxid (allgemein Zinkoxid) in mikrokristalliner Form beigefügt wird und nach dem Beifügen ein mechanisches Zerkleinern erfolgt;
• - Weiterverarbeiten, auch zeitversetzt, des Compounds zu Polymerkompositprodukten.

The polymer composite production method according to the invention, in particular for producing a polymer composite according to the invention, has the steps:

• - Manufacture of a compound for further processing, with a polymer between 0.03-0.5 wt .-% tetrapodal and / or multipodal and / or needle-shaped and / or sail-shaped zinc oxide (generally zinc oxide) is added in microcrystalline form and after Mechanical crushing takes place;
• - Further processing, also with a time delay, of the compound into polymer composite products.

• Ausgangsstoffe für die Herstellung sind insbesondere entweder thermoplastische, polare Kunststoffe, oder elastomerische/duroplastische Kunststoffe, die durch Polyaddition oder Polykondensation vor, während oder nach der Reaktion eine polare Gruppe enthalten.

The process for producing such a polymer composite can in particular be as follows:

• Starting materials for the production are in particular either thermoplastic, polar plastics, or elastomeric / thermosetting plastics, which contain a polar group by polyaddition or polycondensation before, during or after the reaction.

Another starting material are the zinc oxide (ZnO) microcrystals in the form of tetrapods or multipods (tetrapodal), the individual arms of which have grown together with the body, i.e. have not yet broken off.

These microcrystals are added to the thermoplastic, polar or polar monomer / oligomer in the case of thermoset / elastomeric polymers in a concentration between 0.03 and 0.5% by weight and are comminuted by mechanical processing.

A standard screw extruder is sufficient for mixing thermoplastics; for multi-component systems, an ultrasonic rod should be used for at least 10 s in order to generate as many fragments as possible.

Thermoplastic compounds produced in this way can then be further processed as required. For thermoset and elastomeric composites, the necessary monomers should or must be brought to full reaction within 14 days.

The tetrapodal and / or multipodal and / or needle-shaped and / or sail-shaped zinc oxide is activated by grinding, that is, by breaking the tetrapods in the polymer. When the tetrapods break, highly reactive, polar planes are released in the c-axis of the wurtzite structure, which react with the polymer components. It is important that the additive according to the invention is broken down in the polymer in order to bring reactive planes into connection with polymer components. If the additive and thus also the tetrapods are broken outside the polymer, the reactive surfaces react with the air atmosphere and the additive can no longer work. The highly reactive levels are significantly more energetic than the intact side surfaces grown in the synthesis process for microcrystals. A more homogeneous reaction of the plastics is made possible. Because composites can be produced with at least one polar component before, during or after the polymerization by polycondensation or polyaddition, it is possible to obtain the properties described above. In particular, the additive should preferably be introduced into the hydroxyl group or a component equipped with this type of group and ground there, since the positive effect of the additive can then be fully exploited.

Due to the improvement of the mechanical properties and the more homogeneous reaction, it should be possible that some layer systems, such as films for the food industry, can be avoided. These layer systems are used for preservation by means of an oxygen barrier, for example Meat products are used and are not recyclable due to the layering of different polymers.

The corresponding zinc oxide-polymer composite additive according to the invention can be used as an additive to thermoplastics, and an improvement of up to 30 percent in the mechanical properties is achieved even with added amounts of less than 1 percent by weight. Since the principle of action is based on the small grinding or breaking of the microstructures, the additive can be introduced in any conventional extrusion process in order to develop its effect and to strengthen the end product. In this way, material can be saved in many applications such as film production. The films can be made thinner because less material reinforced by the extrusion additive has the same strength as thicker material without additive. Due to the small quantities and the classification of zinc oxide as a biomaterial, its use is not limited by the particular application of the plastic.

If the homogenization of the components in the production of 2-component polymers either with a standard ultrasonic rod with, for example, 100 watts effective power at 50 percent amplitude and a duration of 20 seconds or with a dissolver disc for dispersing micro and nanoparticles with at least 6000 Revolutions per minute takes place for at least 5 minutes, good, reproducible values with regard to the breaking of the tetrapods are achieved. This leads to the plastic composites being required to have a low degree of filling.

It is further advantageous that, when zinc oxide is processed in the polymers, the viscosity of the mixture of 2 or more liquids is reduced when it is introduced in accordance with the invention. As a result, the processing speed can be increased significantly and process costs can be saved. Furthermore, the better flowability reduces internal stresses which normally occur during extrusion and which can weaken the polymer.

As a result of the effect shown above and the increased rate of stress relaxation, a finished, cast component has significantly fewer internal stresses than a similar component made without ZnO. This becomes visible in polarization microscopy, in which it can be seen that above all interfaces (inclusions such as air bubbles, microcracks, etc.) and the surfaces of the cast part are affected. Since the formation of cracks originates from the surface of the component and from the inner boundary surfaces during deformation, it is important to avoid pre-tensioning at these points in particular.

The addition of tetrapodal zinc oxide ultimately creates a component that does not rotate polarized light compared to pure matrix polymer. Ultimately, this allows you to determine the level of internal tension due to a significantly higher polarization of unfilled components. Even when scratches are generated on the surface, when the PTU is unfilled, these show a significant concentration of stress, which will inevitably weaken the polymer. In comparison, the stresses around a scratch are completely relieved when the plastic is filled.

In particular, in the case of two-component plastics, the zinc oxide is introduced into the polar component of the 2K plastic for processing and broken there. This is unusual, but leads to the advantages of the novel plastic components described above.

An exemplary but non-limiting production example and two exemplary but non-limiting application examples of the invention are given below, these being intended to explain the invention and not to be regarded as limiting:

Production example additive:

For a zinc oxide briquette with a density of 1.3 grams per cubic centimeter, a mold with a volume of 10 cubic centimeters is used. A mixture of 2 grams of polyvinyl butyral as micropowder (particle size> 10 micrometers) and 13 grams of uncomminuted tetrapodal zinc oxide with a size between 100 nanometers and 100 micrometers is used. The powders are carefully mixed by hand until a homogeneous mixture is obtained. The entire 15 grams of the resulting powder are placed in the mold and the volume is pressed to 10 cubic centimeters. The mold and its contents are stored at 80 ° C. for one hour so that the polyvinyl butyral melts and the remaining powder sticks together. This allows the pressed mass to be removed from the mold and then baked in a high-temperature oven at 900 - 1100 ° C for 3-5 hours. After cooling, the zinc oxide briquette can be vacuum packed.

Application example 1 - additive in thermoplastic:

When processing polar, thermoplastic plastics (polyamide, polyethylene terephthalate, polylactic acid, etc.), a weight percentage of less than 0.5% and 0.03% can be used, depending on the capacity of the extruder that is used for plastics processing. Zinc oxide briquette can be added. The briquette with the corresponding weight is placed in the plastic dispenser given. Normal operation of the screw extruder grinds the briquette into its individual functional components. To do this, it is necessary to let the extruder mix for a certain period of time. The exact time for a homogeneous mixing depends on the respective polymer and the processing temperature and corresponds to the time required to mix in other substances (dyes and fillers). Subsequently, pellets or granules can be produced from the polymer with the addition of additives, which can then be further processed. When processed correctly, the plastics with additives have one or more of the following properties: higher tensile strength, reduced stickiness, more uniform glass temperature when comparing several batches.

Application example 2 - additive in 2-component polymer:

When processing 2-component polymers with at least one polar component (epoxy resins, polyurethanes, etc.), the zinc oxide briquette is added to the polar component. Less than 0.5 to 0.03% by weight of zinc oxide briquette, based on the weight of the finished polymer, is added. With the help of a mechanical mixing unit (disperser, ultrasonic rod), this mixture is homogenized until all arms / spines have broken. When using a commercially available ultrasonic rod, this corresponds to about 10 to 20 seconds at 50% amplitude. After homogenization, the two components of the 2-component polymer are mixed in the correct mixing ratio within a period of up to 2 weeks after the zinc oxide briquette has been mixed in, and polymerized according to the manufacturer's instructions. In contrast to plastic without additives, the finished polymer has one or more of the following properties: higher tensile strength, reduced tack, more homogeneous glass transition temperature.

• Das Zinkoxid-Polymer-Additiv umfasst bindungsmittelfreies tetrapodales Zinkoxid, wobei mindestens 90 Gewichtsprozent des Additivs aus tetrapodalem Zinkoxid bestehen und das Additiv in brikettierter Form mit einer Dichte zwischen 1,0 und 1,5 Gramm pro Kubikzentimeter vorliegt. Tetrapodales Zinkoxid besteht per Definition aus unzerbrochenen Tetrapoden.

For the sake of completeness, an example is given below for the production of corresponding zinc oxide briquettes which are suitable for a corresponding addition of the tetrapodal zinc oxide. However, this form should not be considered restrictive, since the zinc oxide in tetrapodal form can also be pre-produced and provided in various other manufacturing processes:

• The zinc oxide polymer additive comprises binder-free tetrapodal zinc oxide, wherein at least 90 percent by weight of the additive consists of tetrapodal zinc oxide and the additive is in briquette form with a density between 1.0 and 1.5 grams per cubic centimeter. Tetrapodal zinc oxide is, by definition, made up of unbroken tetrapods.

Because the briquetted form can have predetermined breaking points for portioning, simple portioning of the additive is possible depending on the required amount and intended use.

If the individual tetrapodal zinc oxide particles have a diameter from the interval 100 nanometers to 100 micrometers, the zinc oxide structure has a morphology that allows the structure to be broken across the reactive plane. The tetrapodal zinc oxide particles should not be less than 100 nanometers in size, since otherwise enough shear forces can no longer be applied to break off zinc oxide structures from the tetrapodal zinc oxide particles. The zinc oxide particle size should be less than 100 micrometers so that it can be used in small and / or thin components such as foils. Since larger particles can more easily lead to crack nuclei in the polymer, smaller particles in the range of 100 nanometers should preferably be used. The aspect ratio of the tetrapodal zinc oxide particles should be greater than 3. At least individual particles, but preferably a network of particles, should be used in order to obtain, among other things, good processability and low dust generation.

1. a. Vermischen von in Pulverform und / oder in vernetzter Form vorliegendem tetrapodalem Zinkoxid mit einem Binderpolymer und Zinkmetall-Pulver, wobei die Gewichtsanteile von Binderpolymer und tetrapodalem Zinkoxid in einem vorbestimmten Verhältnis zwischen 1 : 2 und 1 : 7 eingerichtet werden und dem Gemisch aus tetrapodalem Zinkoxid und Binderpolymer bis zu 10 Gewichtsprozent Zinkmetall-Pulver beigemischt werden und für eine Änderung der Dichte der Anteil Binderpolymer zu tetrapodalem Zinkoxid in den zuvor genannten Verhältnissen variiert werden kann;
2. b. Einfügen / Einfüllen / Geben des homogenisierten Gemisches in eine Brikettier-Pressform;
3. c. Wärmebehandeln des Gemisches in der Pressform für wenigstens eine Stunde bei einer Temperatur wenigstens 10 °C oberhalb der Bindetemperatur des Schmelzpolymers;
4. d. Abkühlen auf eine Temperatur wenigstens 20 °C unterhalb der Schmelztemperatur des Binderpolymers;
5. e. Entnehmen des Inhalts der Pressform als formbeständiger Grünling;
6. f. Sintern des Grünlings bei Temperaturen zwischen 900 °C und 1100 °C für 3 bis 5 Stunden unter Verbrennen des Binderpolymers;
7. g. Abkühlen lassen des Zinkoxid-Briketts.

The zinc oxide polymer additive manufacturing process can be carried out using the following steps as an example:

1. a. Mixing of tetrapodal zinc oxide present in powder form and / or in crosslinked form with a binder polymer and zinc metal powder, the weight proportions of binder polymer and tetrapodal zinc oxide being set up in a predetermined ratio between 1: 2 and 1: 7 and the mixture of tetrapodal zinc oxide and Binder polymer up to 10 percent by weight of zinc metal powder can be admixed and the proportion of binder polymer to tetrapodal zinc oxide can be varied in the aforementioned proportions to change the density;
2. b. Inserting / filling / giving the homogenized mixture in a briquetting press mold;
3. c. Heat treating the mixture in the mold for at least one hour at a temperature at least 10 ° C. above the bonding temperature of the melt polymer;
4. d. Cooling to a temperature at least 20 ° C. below the melting temperature of the binder polymer;
5. e. Removing the contents of the mold as a shape-retaining green compact;
6. f. sintering the green compact at temperatures between 900 ° C. and 1100 ° C. for 3 to 5 hours while burning the binder polymer;
7. G. Let the zinc oxide briquette cool down.

Both polyvinyl butyrals, polycaprolactams, polyethylene glycols or waxes can be used as binder polymer in the process. The binder polymer can preferably be selected from the polymers mentioned.

The binder polymer can preferably have a melting point below 100.degree. If plastic molds are used to press the zinc oxide briquettes, this is necessary. When using molds made of metal, other polymers with higher melting points can also be used.

The grain size of the zinc metal powder should not be larger than the diameter of the individual tetrapodal zinc oxide particles. Standard spherical microparticles and nanoparticles can be used. The reason for adding zinc metal powder is to increase the strength of the zinc oxide briquette through the formation of crystal penetrations.

Since the tetrapodal zinc oxide can be mixed with the binder polymer with a mechanical stirrer at 100 revolutions per minute, for example, the process is carried out as gently as possible, since the tetrapodal zinc oxide is not broken during the mixing process.

Zinc oxide additive use of the tetrapodal zinc oxide briquette is, for example, the portioned addition of the additive to a masterbatch or a prepolymer component before polymer extrusion and the grinding of the additive by an extruder. In the production of 2-component polymers, the zinc oxide to be added can also be used in a corresponding dosage form. It is added in portions to a component as an emulsifier and homogenized with the help of a mechanical mixing unit. In both cases, the use of the additive improves the product.

The dosage form of the tetrapodal zinc oxide in the form of a zinc oxide briquette has various advantages. The zinc oxide briquette can be transported without the tetrapodal zinc oxide breaking and dusting of the tetrapodal zinc oxide during transport can also be avoided. The additive in the form of a zinc oxide briquette is easy to use and can be added reliably. Breaking points for separation and portioning further simplify handling.

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• CN 104419198 B [0007]
• CN 104592536 A [0008]
• CN 104725761 A [0009]
• CN 104788780 A [0010]
• CN 105623248 A [0011]
• CN 107501700 A [0012]
• CN 109181085 A [0013]
• CN 1927933 A [0014]
• EP 0325797 A1 [0016]
• EP 2550241 B1 [0017]

Claims (11)

Polymer composite of a matrix polymer and zinc oxide, the zinc oxide being contained in fragments and in a concentration between 0.03-0.5% by weight in the polymer composite. Polymer composite according to Claim 1 , characterized in that the zinc oxide in fragments is tetrapodal and / or multipodal and / or needle-shaped and / or sail-shaped zinc oxide. Polymer composite according to Claim 1 or 2 , characterized in that the zinc oxide fragments are present as zinc oxide microcrystals or in microcrystalline form. Polymer composite according to Claim 1 , 2 or 3 , characterized in that at least one side of the tetrapodal zinc oxide present in fragments is formed with at least one characteristic of a classic brittle fracture (terrace and step formation of the surface). Polymer composite according to one of the preceding claims, characterized in that the zinc oxide fragments have high-energy fracture facets and low-energy side surfaces. Polymer composite according to one of the preceding claims, characterized in that the zinc oxide fragments have a crystallinity that is higher than what is referred to in the prior art as microcrystalline and / or nanocrystalline, and / or the zinc oxide fragments are in the form of single crystalline fragments . Polymer composite according to one of the preceding claims, characterized in that the zinc oxide fragments are present within a size distribution between 100 nm and 100 µm. Polymer composite according to one of the preceding claims, characterized in that the zinc oxide fragments have an aspect ratio> 3. Polymer composite according to one of the preceding claims, characterized in that the polymer composite has at least one of the following properties: - increased stress relaxation rate compared to the unfilled or with classic solid additives and / or glass fibers / carbon fibers / carbon nanotubes; - mechanical reinforcement compared to unfilled plastic or plastic filled with additives; - more homogeneous properties with regard to glass transition temperature T _G and / or yield point and / or tensile strength; - Reduction in stickiness compared to unfilled plastic or plastic filled with additives; - Narrow distance distribution of the particles in the matrix material, contrary to the normal distribution to be expected. Polymer composite according to one of the preceding claims, characterized in that the plastic of the polymer composite is selected from: thermoplastic, polar or elastomeric / thermosetting plastic, these being formed by polycondensation or polyaddition with at least one polar individual component before, during or after the polymerization or a have polar group. Polymer composite production method, in particular for the production of a polymer composite according to one of the preceding claims, comprising the steps: - Production of a compound for further processing, with between 0.03-0.5% by weight of zinc oxide in microcrystalline form being added to a polymer and mechanical comminution taking place after the addition; - Further processing, also with a time delay, of the compound into polymer composite products.