JPS5949253B2 - Phenol - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a phenolic resin molding material,
The objective is to provide a technology for efficiently producing a phenolic resin molding material that has extremely excellent fluidity and moldability and has little variation.

Conventionally, various liquid plasticizers have been used in the production of phenolic resin molding materials in order to achieve sufficient kneading effects and to obtain good fluidity.

In this case, it is important to uniformly disperse the plasticizer in the raw material in advance and add a predetermined amount to the raw material, and various methods of adding the plasticizer have been conventionally used. for example,
The most commonly used method for adding liquid plasticizers is to put the specified solvent into a raw material mixing blender and mix thoroughly before roll kneading. It was a method.

In this case, although the amount to be added can be accurately measured, it is difficult to sufficiently disperse it. The main reason is that when adding a liquid plasticizer, if it is added in the form of a spray,
This is because during mixing, the resins fuse and form a lump. Further, when a liquid plasticizer is put into a mixing blender, the plasticizer adheres to the inner wall of the blender and equipment that comes into contact with the material, significantly impairing workability. The raw materials obtained by this method were kneaded in batches using hot rolls to produce phenolic resin molding materials. However, manufacturing conditions must be varied for each rod to obtain a constant flow.

Naturally, there will be differences in quality between rods. In addition, even if the amount of plasticizer added is accurate, dispersion is insufficient and there are local variations. The result was a mixture of products, and the quality was inferior.

In order to improve these drawbacks, a manufacturing method in which liquid additives are added to the phenolic resin molding material already kneaded with hot rolls (Japanese Patent Publication No. 48-34831) and a manufacturing method in which a solid oily substance is added (Japanese Patent Publication No. 34831) No. 46-32503) is known. In either case, the additive is simply added to the molding material and mixed, and then adsorbed or attached to the particles of the material. The purpose of this is disclosed in Japanese Patent Publication No. 48-34831, for example, to prevent fine powder from scattering, and the effect of improving fluidity is also described, which is a natural reason for a plasticizer, and it is not necessary to add or mix it. As mentioned above, it is difficult to always maintain stable fluidity with only the above-mentioned methods. The method disclosed in Japanese Patent Publication No. 46-32503 is intended to improve moldability using an injection molding machine, and cannot be expected to have any effect of imparting fluidity when kneaded into a molding material. In order to solve the above-mentioned problems, the present inventors took advantage of the quality and productivity of continuous rolls, and in order to improve fluidity and reduce variation, the raw materials on continuous rolls (for example, 1, 0001<g
/Hr) and a liquid plasticizer (for example, 51/Hr) at a fixed ratio.
) is a method for manufacturing phenolic resin molding materials using a new continuous automated roll system that supplies a fixed amount of phenolic resin.

It has been discovered that by supplying a fixed amount of liquid plasticizer on a continuous automated roll in this way, stable kneading can be performed and quality can be improved by providing a certain fluidity. In the conventional batch method, the fluidity varies widely within the rod or between rods, causing problems in moldability. The molding material produced by the present invention has significantly less variation within and between rods, always has stable fluidity and flow stability, and has excellent moldability in molding such as injection molding. . In addition, the obtained molded products also have the advantage of less variation in appearance and other properties. As mentioned above, there is no known method to continuously add a fixed amount of liquid plasticizer to raw materials on a continuous automated roll, and there is no method known to continuously add a fixed amount of liquid plasticizer on a roll. As a result, we have found a method for producing a material with improved kneading properties and excellent fluidity with little variation, but such effects were not known in the past. Liquid plasticizers that can be used in the present invention include styrene,
These include furfural, glycerin, alcohols such as methanol, aniline, water, etc.

The amount added is within the most effective range for fluidity and moldability, but it is usually 0.1 to 5.
Add 0 parts and mix. The method for producing a phenolic resin molding material according to the present invention will be explained in detail.

First, a raw material mixing blender (for example, a lipon blender,
The raw materials for the molding material are homogeneously mixed using a pen shell mixer, kneader 1, etc., and are continuously weighed and given in a fixed amount onto a kneading roll using a separate raw material supply device (e.g. rotary feeder 1, screw feeder 1, etc.). supply to

Depending on the speed of this raw material supply (e.g. 1,000k
g/Hr), a liquid plasticizer (for example, 52/Hr) is added continuously using an interlocked metering pump. In this way, by adjusting the amount of plasticizer added to correspond to the amount of raw materials supplied, homogeneous heating and kneading can be achieved and constant fluidity and flow processability can be imparted. Further, as an addition method, a method can also be adopted in which a liquid plasticizer is uniformly sprayed onto the raw material using a solvent addition nozzle. Next, variations in fluidity, moldability, etc. were investigated for the molding materials obtained by the production method of the present invention and the conventional method by adding furfural as a liquid plasticizer at a ratio of 511 to 1000 kg of raw materials. The results are shown in Table 1.

As shown in the table, the phenolic resin molding material produced by the method of the present invention has little variation in fluidity and has extremely excellent moldability.

In addition, by adopting the method of adding on rolls, production workability became better.

Claims (1)

[Claims] 1. A method for producing a phenolic resin molding material, characterized by continuously adding a liquid plasticizer at a fixed ratio to raw materials on a continuous automated kneading roll.