Method of measuring mass content of binder in items made of composite material

FIELD: weighing equipment; chemical mechanical engineering.

SUBSTANCE: method can be used for measuring content of binder in reel-up composite material produced by preliminary soaked thread. Method is based upon weighing. The constant values are determined according to the method as length of thread for specific type of items and value of linear density averaged for any reel before and after soaking by binder and reeling it up onto frame. Weighing is performed for item before reeling it up with soaked thread and after reeling-up and final polymerization of composite material to determine mass of composite. Basing upon the data received, content of thread is determined which value is subsequently used for finding mass content of binder in composite from relation of C=(M-LxT/M)x100%, where C is content of binder in composite, in mass percent; M is mass of composite, g; L is length of thread consumed for item, km; T is average arithmetic meaning of values of linear density of thread and its rests at any reel before and after impregnation, g/km.

EFFECT: higher stability of performance measures.

1 ex

 

The invention relates to the production of a composite material such as fiberglass, by winding the pre-impregnated filaments, in particular to methods for determining the content of the binder, and can be used in chemical engineering and other industries where required to ensure the stability of indicators of the quality of impregnation and technologically controlled by this parameter.

There is a method in which the weight of the binder is determined as the difference between the plastic mass determined by weighing the product before and after winding and curing, and the weight of the yarn (glass, aramid, Armos, coal and the like), the flow rate of which is determined as the difference of the masses of bobbins before and after winding. This method is used, for example, in cases of winding yarn by passing it from the reel through a connector directly on the product, e.g., hardening, or removed after curing of the shaping mandrel [1].

However, it does not apply when the product is to improve the properties of plastic, defined as impregnation, is made by winding a pre-impregnated with a binder thread with technological mandrels with subsequent final polymerization. In this case, the production mandrel is wound is certainly more than is required at IU the e on one product, filaments with a binder, and cannot accurately take into account either the quantity of binder or thread.

In such cases used, for example, fiberglass-known method of burning [2, 3]. This destructive way of controlling the content of the binder in plastic, in which different parts of the finished product take samples of plastic in the form of buttons. The sample is weighed, then burned in a muffle furnace at a specified temperature for a specified time, again weighed and the average value of the decrease of the mass is taken for the content of the binder. This part of the searched value is the error in the form of sizing yarns, also burning when burning. For example, for glass yarns number of sizing can be...1,6 0,7% (determined according to GOST 6943.8-79). As you can see, deciding on the content of the binder in the plastic in this way requires considerable expenses for sample preparation, special equipment and very time-consuming insufficient degree of accuracy.

To determine the content of the binder in the fiberglass non-destructive method can be used beta-radioactivity [3, str]. The method is based on the phenomenon of backward scattering (reflection) of electrons from the material with higher density (average atomic number of the glass is higher than that of the binder). However, the sensitivity of the method of radicina relatively thin structures, allowing radiation to penetrate only 0.5 mm. Technique measurements using fast electrons taking into account the cost and size of equipment is a big problem for practical application in production. In addition, the accuracy of determination of technological parameters of this method (±2%) lower than it would be necessary.

Thus, the current level of technology determination of the content of the binder in composite materials obtained by winding pre-impregnated with a binder thread, the most acceptable for practical use and close to proposed solution is a well-known method, for example, burning [2].

The technical result of the present invention is the provision of opportunities available non-destructive method of monitoring the content of the binder in the composite, obtained by winding a thread, pre-impregnated with a binder, followed by a final polymerization. In comparison with the prototype method (burning) decrease the cost, duration and complexity and at the same time increases the accuracy of determining the mass content of the binder in the composite material.

The invention consists in the fact that in the proposed method of determining the content of the binder in the product of the composite material obtained is m-wound thread, pre-impregnated with a binder, followed by a final polymerization, including weighting, for each type of product determines the calculated or experimentally as the initial constant value of the consumable product length of thread, determine the linear density of the samples thread and its residues on each reel, taken respectively before and after impregnation with the binder and the coiling process the mandrel, the weighting is carried out for the product to winding the impregnated thread and after winding and a final polymerization of the composite material, determining the weight of the composite, while the content of the binder is determined by the formula

where C is the content of the binder in the composite wt.%;

M is the mass of the composite, g;

L is the length spent on the product thread, km,

- the arithmetic average of the specific values of the linear density of the yarn and its residues on each reel before and after impregnation and winding, Tex (g/km).

The mass content of the binder in the composite material is the difference between the masses of the composite (M) and the thread (m). Determination of the mass of the yarn in accordance with the proposed method has not been used previously in the manufacture of products by winding with technological mandrels pre-impregnated thread. However, comprises the acts, the solution is quite simple. For a specific type of product length (L, km) spent on it the thread is a constant value which is easy without any cost to determine with the required accuracy (e.g., for tubular products in the field of tolerance on the length of the product it changes to ±0,08%) or by calculation based on the configuration items and settings winding or experimentally. When calculating the mass (m, g) by the formulaspent on the product thread use the average value (, Tex) with a linear density of samples thread and its residues, taken from each bobbin, respectively, before and after impregnation and winding on a technological frame. Calculating a linear density of (T, Tex) samples of yarn produced well-known by known and sufficiently high accuracy (for example, for glass yarns with a precision of 0.01% by GOST 6943.1-79). The proposed method is declared in an indissoluble combination of features enables nondestructive detection with higher accuracy by eliminating the influence of the magnitude of the lubricant, binder content, and therefore provides the possibility of non-destructive quality control of manufacturing products made of composite material pre-impregnated winding thread, no special equipment is required, thus Nigam costs.

Example. You want to produce products with a shell made of fiberglass. For each piece of the product, different in configuration from the other, calculated accurate to one meter with regard to its geometrical dimensions and parameters of the winding flow of glass yarns. Summing these values, get the contents of the glass yarns (L, km) GRP - value constant for a particular model - 4,227 km

Determined according to GOST 6943.1-79 linear density (T, Tex) glass yarns on each of the two bobbins before impregnation binder and wound on a technological frame. After impregnation on reels leave the yarn in a quantity sufficient to determine the linear density, and define it. Accordingly, the linear density on the first reel - to 58.2 Tex and 58.9 Tex, on the second reel - 56.0 Tex and 55.8 Tex. Calculate the arithmetic mean linear density ():=(58,2+58,9+56,0+55,8):4=57,22 (Tex).

On the basis of the so determined values of L and T, calculate the mass of glass yarns (m) GRP:

m=L·=4,227-57,22=241,87 (g). (Note. For a comparative evaluation of the values obtained by the proposed method, the product was wound the yarn without a binder, and determined its mass as the difference of the mass of the products after winding and before. The difference in against the Sri 0,1...0,2%, i.e., obtained a fairly high compliance values).

Weigh the product to wound him with the technological frame of fiberglass (yarn, impregnated with binder) - 2129,82 g and after winding and curing the binder - 2434,28, Calculate the mass of fiberglass (M): M=2438,28-2129,82=304,46 (g).

Calculate the content of the binder in the fiberglass (wt.%):

C=[(M-m)/M]·100%=[(304,46-241,87)/304,46]·100%=20.6 per cent.

Implementation of the invention allows to:

- save articles from the wound with pre-impregnated filament composite, destructible with the existing well-known methods of determining binding;

- reduce the complexity of the method, since the cooking process of hanging the composite is longer and more difficult than getting a few skeins of yarn from the bobbins;

to reduce the duration of the determination of the binder content: when the known method it is measured in hours, offer - minute;

to reduce costs, because it eliminates the need for equipment for cooking and burning portions of the composite, as well as energy consumption.

Sources of information

1. Gedansky. High-strength oriented fiberglass. M.: Nauka, 1966, s.285-289.

2. Composite materials. The Handbook. Under the General Ed. VLV, Hummersforsale, M.: engineering, 1990, s-231.

3. Handbook of composite materials. In two books, the second Book. Edited Glubina, Translations from English., M: mechanical engineering, 1988, s-457, s.

The method of determining the mass content of the binder in the product of the composite material obtained by winding filaments pre-impregnated with a binder, followed by a final polymerization, including weighing, characterized in that for each type of product determines the calculated or experimentally as the initial constant value of the consumable product length of thread, determine the linear density of the samples thread and its residues, taken from each bobbin, respectively, before and after impregnation with the binder and the coiling process the mandrel, the weighting is carried out for the product to winding the impregnated thread and after winding and a final polymerization of the composite material, determining the weight of the composite, while the content of the binder is determined by the formula

where C is the content of the binder in the composite wt.%;

M is the mass of the composite, g;

L is the length spent on the product thread, km;

- the arithmetic average of the specific values of the linear density of the yarn and its residues on each reel before and after impregnation and winding, Tex (g/km).



 

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