JPS6218216A - Cylindrical body - Google Patents

Abstract

PURPOSE:To supply fibers with less unevenness and mix them with a resin liquid to uniformize the mixture, by making supplied fibers containing styrene to a cylindrical body and supplying it at an appropriate distance over the width of the apparatus. CONSTITUTION:A cylindrical body for sheet molding compound whose apparent specific gravity is 0.1-3.0 is prepared by fixing fibers whose filament thickness is 0.1-1,000 denier and filament length is 0.1-50mm with 0.1-40wt% of styrene soluble resin as a binder. The fibers are one or a combination of more than two of natural, semisynthetic, synthetic, carbon, metal fibers and whiskers and styrene soluble resins used as the binder are styrene-containing latex, polystyrene resin and vinyl chloride/vinyl acetate copolymer. The cylindrical body thus prepared can be easily separated into small agglomerates of fibers by only supplying them into a chopper for glass robing. The fibers in the agglomerates are then uniformly dispersed because the resin fixing fibers become soluble in styrene in SMC to improve greatly the characteristics of SMC.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet molding compound (hereinafter referred to as 8M
It is abbreviated as O. )1- Concerning reinforcing fiber supply form for improvement.

As is well known, 8MO is made by combining unsaturated polyester resin with fillers, colorants, internal mold release agents, hardening agents, thickeners, etc. with glass fibers, covering both sides with a film such as polyethylene, and then coating the film with a film such as polyethylene. It is obtained by applying pressure to impregnate glass m fibers with the mixture, defoaming them, winding them up to a predetermined length, storing them at an appropriate temperature, and aging them.

Glass Ji here! M is used as a reinforcing material, but its fluid dispersibility and impact resistance of molded products are not always satisfactory, and improvements in these points have been desired.

SMO manufacturing equipment is equipped with a zipper that cuts the glass roving, and these generally have rubber rollers and cutter rollers that sandwich the glass to cut it and drop it into an unsaturated polyester resin liquid. By the way, polypropylene fibers, vinylon fibers, aramid fibers, carbon fibers, gold-X fibers, etc. cannot be cut as easily as glass fibers, and even if they can be cut, they are more rigid than glass, which can lead to faster wear of equipment and lower productivity. decrease. For this reason, a dedicated and low-cost cutting device is required, and it is generally difficult to accept the use of such a cutting device. Therefore, it would be a good idea to cut the fibers in advance and supply them to the 8MC manufacturing equipment well in advance, but this would create fiber balls or generate static electricity, causing uneven supply.
There is a danger that the toluene may ignite due to static electricity generation, or that it may become impossible to supply the toluene and cause an explosion.

In view of these points, the present inventors focused on the fact that the crosslinking agent of the unsaturated polyester resin constituting SMO is styrene [7]. In other words, if the binder used to bind the fibers is soluble in styrene, when combined with the resin mixture, the binder will be dissolved by the styrene in the resin mixture, and a''m will be unbound and separated into individual fibers. In addition, although there are various widths of 8MC manufacturing equipment, most equipment is approximately 1rrL wide.It is important to supply fibers in a constant quantity with less unevenness to such wide equipment from the viewpoint of SMO production efficiency. This is extremely important from the viewpoint of product quality control.If a method that takes advantage of the glass roving supply method is adopted, it would be advantageous in terms of cost.From this point of view, the supplied styrene-containing fibers are made into columns, and the equipment If the fibers are placed in the container at appropriate intervals, the fibers can be supplied with little irregularity, and by mixing with the resin liquid, the fibers can be made uniform.

In the present invention, fibers having a fineness of 0.1 to 1000 deniers and a fiber length of 0.1 to 120 Wn are used with a styrene-soluble resin.
．． The appearance of a continuous columnar material for SMC with a ratio of 71jo and x~3.0 is fixed using 1 to 20% by weight as a binder.

The fibers are polypropylene fibers and polyethylene fibers.

Synthetic fibers such as vinylon a fiber, acrylic fiber, polyester fiber, polyamide fiber, kynor fiber, carbon m fiber, semi-synthetic fibers such as rayon, polynosic, acetate, natural fibers such as cotton, linen, wool, aluminum, iron, Brass, copper, gold fibers such as stainless steel, whiskers such as silicon nitride, boron carbide, alumina, ceramics,
Examples include glass and mineral laminated fibers such as rock wool.

A typical example of the shape of a continuous columnar object is shown in FIG. The cross-sectional shape may be circular, rectangular, or other irregular shape, and the center may be hollow. The point is that a shape that can be stably supplied and has few irregularities in supply should be determined in accordance with the actual situation of the 8MC manufacturing apparatus. The continuous columnar material is pulverized and cut into a predetermined size by a cutter of 8M (after being fed to three cutters in succession), and its thickness depends on the ratio of reinforcing fibers added to the unsaturated polyester resin. Alternatively, it is determined by the number of pieces to be prepared.Also, when manufacturing continuous columnar objects, the apparent appearance can be changed depending on how the binder is used, such as whether latex or resin is used, or the rate of styrene dissolution is fully accelerated by adding a foaming agent and foaming. It is inevitable that the specific gravity will change significantly.

In the present invention, the styrene-soluble resin that serves as a binder when making continuous columnar objects is polystyrene latex,
-Latices such as styrene-acrylate copolymer latex, styrene-butadiene copolymer latex, -Polystyrene pellets for film forming (e.g. Idemitsu Styrol HF-10, NF-20, E'L'-60, L'
l'-70) and blowing agents that foam styrene pellets used to speed up styrene dissolution. The point is that when supplied to the 8MC manufacturing equipment, it is a continuous columnar object,
It is important that the styrene-soluble resin is crushed and cut without cutting the fibers with the glass chopper, and it is better to avoid polystyrene resin that has too high impact resistance and latex that has a strong film that is difficult to crush and cut. preferable. However, impact-resistant resin can also be foamed with a foaming agent to enclose the &I fibers in the expanded styrene resin, increasing the surface area, making it easier to cut the resin part, and increasing the styrene solubility. If it is a resin, there are no restrictions on its shape, properties, manufacturer, etc. In addition, this resin can be selected depending on the hardness of the m-fiber continuous columnar material and the passage distance during molding of the 8MO sheet, but in the 8MO manufacturing process, from the viewpoint of dispersibility, it is recommended to use latex or pellets with a high styrene content. preferable. In addition, the amount of this resin in the fibrous columnar material is strong enough to stably supply the fibrous columnar material, crushing and cutting ability with a cutter, and 8MC.
It must be decided based on a comprehensive consideration of dispersion miscibility into the sheet, SMC quality, etc., but in general it is 0.1~
It is preferable to combine vinegar so that the fiber content is 80 to 99.9 weight percent.

The thickness of the fibers can be from 0.1 to 1000 deniers, but preferably from 1 to 50 deniers.

If the diameter is too thin, dispersion tends to be poor, and if it is too thick, it will be difficult to obtain a continuous columnar structure unless it is made into a columnar structure with many holes.

The fiber length varies depending on the thickness of the fiber, but is 0.1 to 120 na, more preferably 2 to 50 na. Shorter fiber lengths provide better dispersion but reduce the reinforcing effect of the product.

Furthermore, as the fiber length increases, the reinforcing effect increases, but the fibers become entangled with each other, resulting in decreased fluidity and poor fiber dispersion.

A method for producing a fibrous columnar material is to put fiber IOt latex or polystyrene chips cut into predetermined lengths into a kneader or extruder, extrude through the gou at the tip, dry and solidify to obtain a fibrous columnar material. At this time, if the material is wound around a bobbin, the Fa fibrous material can be easily supplied in a constant quantity during the production of 8Mc.

When winding up a bobbin, the first end of the bobbin is stretched out by approximately 10 to 4 degrees Crn and tied to the end of the surface layer of the next bobbin to be connected, so that the fiber columnar material can be continuously fed and efficiency decreases. production can continue without any problems.

The columnar article of the present invention is made by molding fibers capable of exhibiting characteristic performance in the S-C into a column shape using a styrene-soluble resin that is quantitatively supplied into the S-C. Such columnar objects are
Just by feeding it to the chopper for glass roving in regular SMC production equipment, it is crushed into small fiber aggregates and SMC
evenly distributed. In the aggregate, the resin that binds the fibers is dissolved by the styrene in the SMC, and the fibers are uniformly dispersed within the SMC, greatly improving the performance of the SMC. In addition, this method can be implemented without major modification of conventional SMC manufacturing equipment, and its practical effects are significant.

Example 1 Using vinylon fiber with a single yarn denier of 6.0 denier (product name 1239 1200d/200f manufactured by Kuraray),
Styrene latex with a solid content of 10% (manufactured by Nippon Zeon ■, product name N1pol) was cut into fibers with a length of 24 m+.
LX415A) solution. The dispersion liquid is fed into a kneader having a circular nozzle with a diameter of 10 mm at the tip and capable of feeding liquid. The vinylon fiber latex liquid discharged from the nozzle is received by a wire mesh that moves at the same speed as the discharge speed, and after being gently drained with a liquid squeezing roller, the liquid is heated to 125 to 150°C.
After drying in a hot air dryer, continuous elliptical vinylon fiber columns were obtained.The shapes of the nine fiber columns varied considerably, but in general, the maximum diameter was 1.48mm and the minimum diameter was 0.41rr.
! M, the average denier of the pillars was 1800 denier, and the apparent specific gravity was 0.28.

The latex content of the fibrous columns was determined to be 2.37% by an extraction method.

The vinylon fiber pillars thus obtained were cut into about 25 pieces and impregnated with an unsaturated polyester resin containing 7% styrene, and when slightly combed, the latex as a binder component was dissolved and the fibers were dispersed in the resin liquid.

Example 2 A vinylon fiber with a single yarn denier of 6 dr was cut into a fiber length of 3 m. - Prepare 10,000 styrene pellets (manufactured by Idemitsu Petrochemical Co., Ltd., NF-20, particle size 3.0mφ x 3.0 order), with a diameter of 21/2 inches, L/D = 16.6, and a compression ratio of 4.0. Mix polystyrene and vinylon fibers in a ratio of 30:70 in an extruder, and set the extruder tip temperature to 220°C.
The polystyrene was melted and the vinylon fibers were extruded in an unmolten state and cooled in air. The nozzle of the extrusion die was made of stainless steel and had a diameter of 1.0 mm.

The obtained fibrous pillars were cylindrical, had a diameter of approximately x, an apparent specific gravity of 0.68, and a denier of 6900 deniers.

The vinylon fiber pillars thus obtained are relatively easily cut with a chopper, impregnated with 7% styrene-containing unsaturated polyester resin at room temperature, and mixed for 10 minutes.
The polystyrene as a binder component was dissolved in seconds to 5 minutes, and the Fa fibers were dispersed in the resin liquid.

Vinylon fiber cut length total 3m, 6 lengths, 12 lengths.

When changing to 24m and 50m to make a fiber columnar material with an extruder, up to V&Waicho 127MI could be fed to the extruder,
24th, 50rE! n could not be fed from the hopper. However, it is thought that this can be improved by changing the size of the extruder and the shape of the hopper.

Example 3 Using vinylon wood and fiber with a single yarn denier of 6d, the fiber length was 3++
It was cut into m. Styrene pellets (NF-20 manufactured by Idemitsu Petrochemical Co., Ltd., particle size 30 mmφX 30 rran) and foaming agent azodicarbonamide (Celmic C manufactured by Otsuka Chemical
) fe prepared, diameter 21/2 inches, I, /D = 1
6.6, in an extruder with a compression ratio of 40 (vinylon fiber) = (
Styrene pellets): (Blowing agent) = 92 near, 5:0
．． The mixture was foamed and extruded at a temperature of 200°C at the tip of an extruder, and cooled in air. The extrusion die nozzle is 5rr
An φ made of stainless steel was used.

The obtained fiber columnar material was cylindrical and had a structure similar to that of fibers floating in styrofoam, with a diameter of approximately 5.4 mm, an apparent specific gravity of 0.14, a columnar denier of 28,900 deniers, and a traverse width of 1. Finch, bobbin diameter 143Tg
It was wound up using an nφ winding machine.

The thus obtained vinylon fiber columnar material was much easier to cut than that of Example 2, and when impregnated with 7% styrene-containing unsaturated polyester resin at room temperature, volumetric shrinkage occurred instantly, and the mixing time was reduced. Within 2 minutes, the binder component polystyrene was dissolved and the a-fibers were dispersed in the resin liquid.

Example 4 Brass 50 micron x 3 m (manufactured by Kobe Cast Iron Works Co., Ltd.) was made of metal fiber with a blending ratio of polystyrene and a foaming agent Q 80:
They were mixed at a ratio of 19.5:0.5, foamed and extruded at an extruder tip temperature of 200°C, and air-cooled to obtain a metal fiber column. The nozzle hole diameter of the extrusion die is φ.

The obtained columnar material had a diameter of about 3.8 mm and an apparent specific gravity of 2.3, and was wound up using a winding machine with a traverse width of 1 inch.

When the metal m-male substance thus obtained was impregnated and mixed in an unsaturated polyester resin containing 7%, the polystyrene as a binder component was dissolved and the fibers were dispersed in the resin liquid within a mixing time of 10 seconds to 5 minutes.

[Brief explanation of drawings]

An example of the columnar object of the present invention is shown in FIGS. 1 and 2. In the figure, 1 indicates the fiber, 2 the binder, and 3 the binder paper metal.

Claims (3)

[Claims] (1) Fineness is 0.1 to 1000 denier, fiber length is 0.
Fibers with a diameter of 1 to 50 mm are coated with a styrene-soluble resin of 0.0 mm.
A columnar material for a sheet molding compound having an apparent specific gravity of 0.1 to 3.0 fixed using 1 to 40% by weight as a binder. (2) The columnar article according to claim 1, wherein the fibers are made of any one or a combination of two or more of natural fibers, semi-synthetic fibers, synthetic fibers, carbon fibers, metal fibers, and whiskers. (3) The styrene-soluble resin used as a binder for the columnar material may be styrene-containing latex, polystyrene resin,
The columnar material according to claims 1 and 2, which is a vinyl chloride-vinyl acetate copolymer.