CZ23865U1 - Composite with synthetic polymeric matrix and cellulose in the form of natural fiber fillers - Google Patents

Description

Composite with synthetic polymer matrix and pulp in the form of natural fiber fillers

Technical field

The technical solution relates to the composition of a polymer composite with natural fiber-based pulp fillers for the production of plastic parts with higher performance properties.

BACKGROUND OF THE INVENTION

Polymeric materials and their composites are among the most progressively developing materials, because polymeric materials represent the most important segment of production and consumption by volume among all technical materials and there is no doubt that they are key to a modern technical society. The current development of polymer materials and their processing technologies will continue to grow in volume, and the success of individual materials developed by basic and applied research will be influenced to a large extent by the price / utility value of the material. This area of research also includes the replacement of glass fibers with natural fibers, which are of environmental interest from polymer processors. Application with natural fibers is an important material change that traditionally goes not only to the automotive industry, but also to the areas of consumer industry, medical applications, etc. The advantage of natural fibers, compared to other fibrous materials (used in the production of composites), is their low weight , low abrasion (preventing wear of processing machines), combustibility, nontoxicity, biodegradability and above all low price, independent of oil price.

Natural fibers are now used in industry as reinforcement of shaped large-area parts, eg wood sawdust, containing cellulose fibers and polypropylene non-woven linen materials. It should be pointed out, however, that these are practically only injection molded products, not injection molding, where high demands are placed on the quality, dimensional and shape accuracy of manufactured parts. Injection of synthetic composites with natural fillers is a very poorly explored area with great potential and potential and a prerequisite for a significant increase, and this proposed technical solution is also directed to this area.

Historically, the application of composites dates back to 1908, when it was first used composite material based on phenolic resin reinforced with wood flour (L.

Baekeland). Owens-Wincis Glass Co. developed glass fibers (1933), the first applications of so-called fiberglass, ie polymer composites with glass fibers, such as aircraft radar covers (1942) or body parts of passenger cars (1956, by Citroen), are gradually emerging. The hidden reality of today is the use of natural fibers for the production of polymer composites used for the production of large-area parts of inner padding and outer parts of car bodies and other transport technologies. The share of biocomposites is growing every year, but there are still few technical solutions and possibilities. The most used natural fibers are mainly hemp, jute, flax, cotton, sisal and wood. Well-known applications are parts in Mercedes C-Class, Daimler AG. (eg door panels and sound insulation), the rear engine cover made of natural fiber mats, etc.

The proposed technical solution responds to the increasing demand and requirements for these materials, which, however, have not been widely used in the Czech Republic. The pressure on the application of such materials is constantly increasing, not only because of the economic situation (the price of oil is not only constantly changing but also increasing), not only due to the possibility of influencing the final and utility properties of products, from synthetic plastics, combustion of synthetic plastics, landfilling).

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The essence of the technical solution

The aim of the technical solution is to create a composite with a targeted composition of matrix, additive and filler based on natural materials for improving the final and utility properties of plastic parts with higher added value and ecologically much lower loadability compared to 100% synthetic products, ie environmental benefits. The principle of the invention consists in that the composite contains from 58.5 to 88.5% by weight of polypropylene, 10 to 40% by weight of natural pulp fibers (fiber length from 0.2 to 2 mm) and from 1 to 1.5% by weight of an additive based on silicone and 0.1 to 0.5% by weight of an additive based on peroxidic dialkyls which act as a chemical catalyst.

The obtained composite is supplied as granules as a standard and is intended for a wide range of plastics processing technologies, eg injection molding.

Examples of technical solution

The polymeric composite with natural fiber-based pulp fillers is described in the following examples, including a suitable application, wherein component A is formed of polypropylene, component B is natural pulp fibers (fiber length from 0.2 to 2 mm), component C is a silicone additive, component D is a peroxide dialkyl additive.

Option 1:

Component A: 88.5 wt% polypropylene Component B: 9.8 wt% natural pulp fibers

Component C: 1.5% by weight silicone-based additive

Component D: 0.2 wt% peroxide dialkyl additive.

Option 2:

Component A: 78.5 wt% polypropylene

Component B: 19.8 wt% natural pulp fibers

Component C: 1.5% by weight silicone-based additive

Component D: 0.2 wt% peroxide dialkyl additive.

Option 3:

Component A: 68.5 wt% polypropylene

Component B; 29.8% by weight of natural pulp fibers

Component C: 1.5% by weight silicone-based additive

Component D: 0.2 wt% peroxide dialkyl additive.

Option 4:

Component A: 58.5 wt% polypropylene

Component B: 39.8 wt% natural pulp fibers

Component C: 1.5% by weight silicone-based additive

Component D: 0.2 wt% peroxide dialkyl additive.

Polymer composites with natural fiber-based cellulosic fillers can be advantageously used for the production of plastic parts by different technological processes which are characterized by better performance and end properties, eg mechanical properties, dimensional stability, etc., economical savings, shortening of production cycles, environmental aspects , etc.

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Industrial applicability

The polymer composite with natural fibrous fillers based on pulp according to the present invention is suitable for the production of plastic parts by different technological processes.

Claims (1)

PROTECTION REQUIREMENTS 1. Polymeric composite with natural fibrous fillers based on pulp for the manufacture of plastic parts, characterized in that the composite contains from 58.5 to 88.5% by weight of polypropylene, 10 to 40% by weight of natural pulp fibers with a fiber length of 0, 2 to 2 mm and 1 to 1.5% by weight of a silicone-based additive and from 0.1 to 0.5% by weight of a peroxide-dialkyl-based additive.