JPS6039299B2 - Manufacturing method of phenolic resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] This invention belongs to the field of plastic manufacturing technology, particularly to the field of manufacturing technology of phenolic resin molding materials.

[Background technology]

Conventionally, when processing phenolic resin into materials, reinforcing materials, fillers, etc. were added.

Reinforcing materials include organic wood flour and pulp, and fillers include inorganic materials such as calcium carbonate and mica. Incidentally, in general, inorganic materials are mostly used as reinforcing materials and fillers in molding materials used in fields where heat resistance is required. For example, inorganic reinforcing materials include asbestos and glass fiber, and fillers include the aforementioned calcium carbonate, mica, talc, and silica. This is to improve heat resistance by minimizing the use of organic compounds. However, even if such an inorganic reinforcing material is used, sufficient heat resistance cannot be ensured, and it is only superior to the case where an organic filler such as wood flour is blended.

In particular, when ordinary inorganic fillers were blended, the appearance and heat resistance after heat treatment were insufficient. Hydroxides of alkali metals are used as inorganic fillers.

Among them, calcium hydroxide, magnesium hydroxide, barium hydroxide, etc. have been conventionally used as hardening aids. It is known that hydroxides of alkali metals have the effect of improving the appearance of molded articles after heat treatment. However, when these are used, during the process of kneading the raw material mixture using a kneader, etc., the raw material mixture adheres to the wing of the kneading device such as the kneader, the area around the kneader, etc., and this adhesion must be removed after each batch. However, in a continuous manufacturing process, the problem becomes even more complicated. As a measure to improve this, a method of mixing a relatively large amount of a solvent such as methanol into the mixture has been attempted, but this actually worsened the heat resistance of the molded product and the appearance after heat treatment. [Object of the Invention] An object of the present invention is to provide a manufacturing method for a phenol resin composition in which the raw material mixture does not adhere to the wall of the vessel during the kneading process using a kneader or the like and is easy to manufacture.

[Disclosure of the invention]

As a result of further consideration of the circumstances explained in the "Background Technology" section, the present inventors found that the above problem could be solved by incorporating zinc hydroxide in place of a part of the alkaline earth metal hydroxide. I learned that I can solve the problem.

Zinc carbonate may also be considered as a hydroxide compound, but this does not improve the performance of the molded product. Furthermore, although zinc oxide is less effective than zinc hydroxide, it can be used in combination with zinc hydroxide. In this invention, the amount of the alkali metal hydroxide blended into the composition is 10 to 2% by weight in the case of calcium hydroxide and magnesium hydroxide, and 15 to 2% by weight in the case of barium hydroxide, based on the phenol resin.
A weight percent of 3 is preferred.

If the amount used is less than each range, the appearance after heating and heat resistance will be poor, and if it exceeds each range, the fluidity during molding will be impaired. The amount of zinc oxide is preferably 0.3 to 0.8 mol per 1 mol of alkali metal hydroxide.

If it is less than 0.3 mol, the effect of reducing adhesion during the manufacturing process will not be sufficient, and if it exceeds 0.8 mol, the appearance and heat resistance of the molded product after heat treatment will not be sufficient.

In addition, in the method for manufacturing the phenolic resin composition for molding, "required manufacturing techniques and means other than those described above are based on known methods. In addition, in this invention, in addition to the inorganic reinforcing material, organic wood flour, It is free to use pulp or the like in combination as long as it does not impede the effects of the present invention.Examples and comparative examples will be described below.

Examples 1 to 7, Comparative Examples 1 to 6 Phenol resins were synthesized by a conventional method using phenol and formalin (37%).

The following formulation was used as a basic formulation, and the amounts of alkali metal hydroxide and zinc hydroxide shown in Table 1 were added to the basic formulation to prepare a raw material mixture. Phenolic resin 1
0 parts by weight Hexa 15 parts by weight Glass fiber 18 parts by weight Zinc stearate 2 parts by weight Methanol
2 parts by weight in boxes Next, the mixture was mixed in a kneader to produce a molding composition.

Note that the numerical values in Table 1 indicate parts by weight. The JIS heat resistance of all of the molded products of the examples is 220oo, and the comparative example is Comparative Example 1 (however, in this case, the amount of methanol used was 4
) has a JIS heat resistance of 21030,
All other comparative examples were 220 ○.

Table 1 In the table, 0 means good, Δ means slightly poor, and × means poor.

〔Effect of the invention〕

This invention involves mixing zinc hydroxide and one or more alkali metal hydroxides consisting of calcium hydroxide, barium hydroxide, and magnesium hydroxide into a raw material mixture, and The method for producing a phenolic resin composition includes a step of kneading a mixture, in which the amount of the alkali metal added to the phenol resin is 1.
0 to 30% by weight, and the amount of zinc hydroxide is 0.3 to 0.8 mol per 1 mol of the alkaline earth metal hydroxide. It has the effect of not adhering to equipment.

Claims (1)

[Claims] 1. In a manufacturing method that includes a step of kneading a raw material mixture of a phenolic resin composition for molding materials, any one of zinc hydroxide and an alkaline earth metal hydroxide consisting of calcium hydroxide, barium hydroxide, and magnesium hydroxide 1
A method for producing a phenolic resin composition comprising mixing a species or two or more species in a raw material mixture and kneading the mixture, wherein the amount of the alkaline earth metal is 10 to 30% based on the phenolic resin. % by weight, and the amount of zinc hydroxide is 0.3 to 0.8 mol per 1 mol of the alkaline earth metal hydroxide.