JPS6225015A - Mold for molding synthetic resin - Google Patents

Abstract

PURPOSE:To make parting synthetic resin molding product out of the mold easier and produce a molding product having a super mirror plane on its surface by means of providing a chemically bonded, uniform and smooth special silicon compound cover on the molding face. CONSTITUTION:Silicon compound cover as shown in the formula is chemically bonded on the molding surface. R1 means alkyl or fluoro alkyl radical having carbon numbers 1-6, or carbocyclic radical having carbon numbers 6-10. R2 and R3 are alkyl or fluoro alkyl radical having carbon numbers 1-6, or carbocyclic radical having carbon numbers 6-10, or either chroline atomic radical or bromine atomic radical. X means chroline atomic radical or bromine atomic radical. The injection molding product can easily be parted without damaging glass, and the mirror plane of glass is accurately printed on the surface of product free from such defects as blurs, clouds and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a mold for synthetic resin molding, more specifically, a resin molded product having excellent mold release properties and good specularity.
This invention relates to a synthetic resin molding die having a molding surface coated with a chemically bonded silicone compound.

Conventional technology Conventional 1 When removing a molded product from a mold in synthetic resin molding, resins that develop strong adhesive properties, such as phenol resins and epoxy resins, have poor releasability from the mold, so they are usually removed from the mold. A method of applying a silicone-based, fluorine-based, or wax-based mold release agent is used.

However, in this method of applying a mold release agent, the molded product often becomes cloudy due to the mold release agent, or a sufficient border cannot be obtained. In particular, when molding optical parts made of synthetic resin, a mold with a mirror surface, such as glass or metal, is generally used, and the specularity of this mold is transferred to the molded product. The above-mentioned method of applying a mold release agent is a problem in that the molded product is easily clouded by the mold release agent and uneven coating of the mold release agent occurs, making it impossible to obtain a satisfactory optical component. There is.

2. Problems to be Solved by the Invention The purpose of the present invention is to solve these problems, and to provide a synthetic resin molded product that can be easily released from a mold, is dust-free, and has an excellent mirror surface. An object of the present invention is to provide a mold for molding a synthetic resin that is moisturized.

Means to Solve the Problems The inventors of the present invention have conducted extensive research to achieve the above object, and have discovered that the molding surface fc of a synthetic resin molding die is coated with a specific silicone compound through chemical bonding. Than,
We have found a way to achieve this objective, and based on this knowledge, we have completed the present invention.

That is, the present invention provides a molding surface with a compound having the general formula 1% (in the formula, R, (is an alkyl ter having 1 to 6 carbon atoms, : is a fluoroargyl group or a carbocyclic group having 6 to 10 carbon atoms, R2 and R3 are an alkyl group having 1 to 6 carbon atoms or a fluoroalkyl group, a carbocyclic group having 6 to 10 carbon atoms, a chlorine atom or a bromine atom, and X is a chlorine atom or a bromine atom. The object of the present invention is to provide a synthetic resin molding mold characterized in that a silicon compound coating is chemically combined with the silicon compound coating.

The silicon compound used in the present invention has the general formula (
A compound having the chemical structure shown in 1), in which R1 is a methyl group such as methyl, ethyl, propyl, methyl, inbutyl group, cyclohex/
7-chloroalkyl group such as a phenyl group, tolyl group, benzyl group, 3,3.3-)lifluoropropyl group, 3,3°4,4,5,5
, 6, and 6.6-narafluorohexyl groups, and R2 and R3 are selected from these groups as well as chlorine atoms and bromine atoms. Therefore, specific examples of compounds of the general formula (+)f include methyltrichlorosilane, dimethylditalolonerane, 3,3.3
-trifluoropropyltrichlorosilane, propyltrichlorosilane, trimethylchloro1 coreane, trimethylbromosilane, isobutyltrichlorosilane, n-hexyltrichlorosilane, 3,3,4,4,”
5, 5, 6, 6, 6-narafluorohexyltrichlorosilane, phenyltrichlorosilane, cyclohexyltrichlorosilane, he/dyltrichloro/ran, p-tolyltrichloro/ran, diphenyldinolosilane.

Since these silicon compounds are decomposed by moisture in the air and generate hydrogen chloride or hydrogen bromide, it is preferable to handle them in dry gas, particularly dry air or nitrogen gas.

Methods for chemically bonding the silicon compound coating represented by the general formula (1) to the molding surface of a synthetic resin mold include a method in which the vapor of the compound is brought into contact with the molding surface of the mold; Methods such as immersing the mold in a solution of the compound dissolved in a suitable solvent or coating the molding surface of the mold with the solution are used.

As a method of bringing the vapor of the silicon compound into contact with the molding surface of the mold, for example, place the mold in a closed container, replace the inside of the closed container with dry gas, and then apply the general formula (+) under normal pressure or reduced pressure. A method of introducing vapor of the compound represented by formula (2), or a method of placing the mold and the compound represented by formula (2) in a dry gas atmosphere at normal pressure or reduced pressure simultaneously in a closed container can be used.

During this process, if hydrogen chloride or hydrogen bromide generated by the silicon compound has an adverse effect on the molded product, after performing the coating formation process, Residual hydrogen chloride or hydrogen bromide can be prevented by washing with a water bath solution such as an alkali metal carbonate or by heating the mold at a temperature of 100° C. for about 1 hour.

On the other hand, a method using a solvent in the silicon compound film forming process (7) includes a solvent and a hydrocarbon solvent such as n-hexane, benzene, l-luene, etc.

Using chlorine-based solvents such as chlorocoform, carbon tetrachloride, and dichloromethane, fluorocarbon-based solvents such as Freon 113, ether-based solvents such as diniter ether, dioxane, and tetrahydrofuran, and ketone-based solvents such as acetone and methyl ethyl ketone, A silicon compound represented by the general formula ([) is dissolved in a solvent of 0.0
A preferred method is to prepare a solution containing 1 to 10M and then immerse the mold in this solution, or to apply the solution to the molding surface of the yield and then dry it.

In this way (7), the general formula (I
) A homogeneous and smooth film of a silicon compound is formed by chemical bonding. This coated synthetic resin mold can be used in any molding method such as compression molding, transfer molding, injection molding, and casting.

Effects of the Invention Since the synthetic resin molding mold of the present invention has a homogeneous and smooth silicon compound coating chemically bonded to the molding surface, it is extremely easy to release the synthetic resin molded product from the yield, and there is no dust or dirt on the surface. A molded article with excellent specularity can be obtained. And the mold for molding of the present invention! It is suitable for molding Evogin resin, phenol resin, urethane resin, polyester resin, diaryl phthalate resin, etc., which have high adhesion to i and rj.

EXAMPLES Next, the present invention will be explained in further detail with reference to Examples, but the present invention is not limited to these Examples in any way.

Example 1 A reinforced glass plate (4
00 x 400

Between two glass plates treated in this way.

A polyvinyl chloride paso ring was sandwiched to form a casting mold, and into this was added too many parts by weight of AER331 (manufactured by Asahi Ciba Co., Ltd., Evogishi TL resin) and 80 parts by weight of hexahydrophthalic anhydride.
．． An epoxy resin composition consisting of 5 parts by weight and 9 parts by weight of benzylmethylamine was injected and heated at 90°C for 2 hours at 140°C.
It was cured for 2 hours.

When the cast product was taken out after slow cooling, the cast product (・
It can be easily released from the mold without damaging the glass.

The mirror surface of glass was accurately transferred to the surface, and no defects such as clouding were observed.

Comparative Example 1 An epoxy resin composition was cured in the same manner as in Example 1, except that a casting mold made of well-cleaned tempered glass was used.

It was difficult to release the cast product from the mold, and an attempt to forcefully release the mold caused the glass to break.

Examples 2-5 Dimethyl dichloro in Example 1 [instead of Conran,
Methyltrichlorane, trimethylchlorane,
Testing was carried out in exactly the same manner as in Example 1, except that 3,3.3-trifluoropropyltrichlorosilane and isobutyl trichloro (1 run each were used).
Results similar to those in Example 1 were obtained.

Examples 6-7 Same as Example 1, except that cyclohexyltrichloro7rane or diphenyldichlorosilane was used instead of dimethylcyclolonan in Example 1, and the pressure inside the sealed container 7B was reduced to about 5 Torr. A cast product was produced in the same manner. The cast product is easy to cast (2πf type and has an excellent surface with no defects such as cloudiness on the surface).

Implementation f! After purging a polyethylene airtight container of A18 80/, with dry air, 50 t of toluene and 0.52 t of dime-f-/resichlorosilane were placed in it, and a well-washed and dried glass plate was immersed in this solution. . The hind paw glass plate was pulled up for about 5 minutes, and the toluene was air-dried with dry air in a sealed container and then taken out.

Claims (1)

[Claims] 1. On the molding surface, there is a general formula ▲ mathematical formula, chemical formula, table, etc. ▼ (R_1 in the formula is an alkyl or fluoroalkyl group having 1 to 6 carbon atoms, or a carbocyclic group having 6 to 10 carbon atoms. Group, R_
2 and R_3 are an alkyl or fluoroalkyl group having 1 to 6 carbon atoms, a carbocyclic group having 6 to 10 carbon atoms, a chlorine atom or a bromine atom, and X is a chlorine atom or a bromine atom) A mold for synthetic resin molding characterized by chemically bonding.