JP3038536B2 - Stain remover composition by gas adhering to resin molding die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composition for removing stains on the inner surface of a mold for removing stains caused by gas adhering to the inner surface of the mold for resin molding and obtaining a resin molded product having a beautiful surface. About things.

[0002]

2. Description of the Related Art In general, a resin molding die is provided with a hole called a gas vent for discharging air to be replaced with resin pressed into a mold cavity and releasing gas generated from the resin. ing. The position of the gas vent hole in the mold is determined to be an optimal position individually according to the shape of the molded product or the like so as to facilitate gas venting. If the position of the gas vent hole is not appropriate, air and gas will stay between the mold and the molded product when the resin is injected, and a part of the gas component will adhere to the inner surface of the mold during cooling. Here, the gas is a common term in the industry, and is a general term for easily volatile components, tacky impurity components, or partially decomposed components of the resin. If such gas remains on the inner surface and the molding is continued while being fixed, an unnecessary streamline pattern appears on the surface of the molded product, defective products such as loss of gloss occur, and the commercial value of the product decreases. So
It is necessary to remove the gas stuck appropriately.

Conventionally, when removing stuck gas, a method of physically removing the gas using a grindstone, diamond dust, or the like has been performed. However, this method damages an expensive mold surface, Dimensions and shapes may change, which is not preferable and has a disadvantage that it takes time.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve these problems according to the above-mentioned prior art, and is intended to remove dirt caused by gas adhering to a resin molding die. It is an object of the present invention to provide another means which can be quickly, easily and economically removed without being damaged.

[0005]

SUMMARY OF THE INVENTION The above-mentioned problems are not caused by the conventional physical means, but by the penetration by a chemical agent,
It can be achieved by using chemical means such as swelling, dissolving, washing and the like. As a result of trial use and selection of various drugs, it was found that drug compositions in which methylene chloride, alcohols, paraffin wax, and methylcelluloses were combined and compounded had suitable properties. Further, as to the mixing ratio thereof, a more detailed test showed that methylene chloride 50%
As described above, alcohols 10 to 30 which are compatible with methylene chloride
%, Paraffin wax 0.5 melting point below 75 ⁰ C
It can be obtained by selecting a drug containing 5.0% and 0.1 to 2.0% of methylcelluloses as essential components and a compounding ratio. Furthermore, if necessary, higher fatty acids 0.5 to
It has been found that adding 5.0% or 1.0-20% of water to the above-mentioned base material improves the performance.

[0006] The remover composition of the present invention comprises 5 parts of methylene chloride.
It contains 0% or more, preferably 50 to 80%. Although the remover penetrates between the mold and the gaseous soil and swells to facilitate removal of the soil from the mold, this property of the remover is primarily due to the action of methylene chloride. Therefore, when the content of methylene chloride is less than 50%, the removing effect is not sufficient, which is not preferable. The alcohol used in the present invention does not decrease the above-mentioned permeability and swelling property of methylene chloride, and even if water is present, the alcohol absorbs the water and the remover easily penetrates the dirt with gas. In order to swell, it is necessary to have compatibility with methylene chloride. Alcohol also has the effect of increasing the solubility of the methyl celluloses described below and increasing the viscosity of the remover.

[0007] Such alcohols include, for example, aliphatic lower monovalent alcohols such as methanol, ethanol, isopropyl alcohol, and butanol, and aliphatic alcohols such as ethyl cellosolve and methyl carbitol. Polyvalent alcohol
Aliphatic polyhydric alcohols such as ter, ethylene glycol and propylene glycol are used. Particularly, methanol is preferably used. Since the boiling point of methanol is close to that of methylene chloride, when the removing agent evaporates, the two evaporate at substantially the same rate, so that a large change in the composition of the removing agent does not occur, and the removing performance is substantially constant. Because it can be kept at The alcohol content in the remover is 10 to
30%. If it exceeds 30%, the performance of the remover decreases, while if it is less than 10%, the required amount of methylcellulose in the remover is not easily dissolved, which is not preferable.

[0008] In the present invention, removing agent forms a 75 ⁰ C or less that is one of the features containing 0.5 to 5.0% paraffin wax mp. Melting point 75 ⁰ C or less paraffin wax, wherein the alcohol and methylene chloride - During removing agent composed mainly of Le not deposit its crystals, and uniformly dissolved, and moderate viscosity during application To prevent dripping, and after application, precipitate on the surface to form a thin film. Thus, paraffin wax, while effectively suppressing the evaporation of methylene chloride,
It has the effect of maintaining the removal performance of the remover for a long time.

When the content of the paraffin wax is less than 0.5%, the above effect is poor, and when it is more than 5.0%, the viscosity of the remover becomes too high, and the permeability thereof is undesirably reduced. As described later, it is desirable that the removing agent of the present invention has a certain viscosity.

The removing agent of the present invention further contains 0.1 to 2.0% of methylcellulose. Methylcelluloses are uniformly dissolved in the removing agent mainly by the dissolving action of alcohols, and as described above, increase the viscosity of the removing agent and suppress the evaporation of methylene chloride. Further, the paraffin wax, particularly a synergistic effect with a melting point of 70 ⁰ C or less paraffin wax, penetration of the removal agent and increase its durability, even in a high temperature atmosphere, such as summer, a small amount of usage Demonstrates satisfactory dirt removal performance with gas.

When the content of the methylcellulose in the remover is more than 2.0%, the viscosity of the remover is too high, causing problems such as poor penetration of the drug.
When the amount is less than 1%, the effect of suppressing the evaporation of methylene chloride becomes small, and the viscosity of the remover becomes too low, so that a dripping phenomenon occurs. As methylcellulose, hydroxypropylmethylcellulose is particularly desirable. This has good compatibility with the remover mainly composed of methylene chloride and alcohol, and gives a large thickening effect to the remover even in a small amount, and further acts together with paraffin wax to remove the remover from the remover. This is because there is an effect of appropriately suppressing the evaporation of the low-boiling components.

According to the present invention, the viscosity of the remover is 10 to 1
The range of 000 cps is suitable, but especially 20 to 300 cps.
cps is preferred. When the viscosity is in this range, the remover has excellent permeability, and does not flow or drip when applied to gas stains.

The above-mentioned methylene chloride, alcohols, paraffin wax, and methylcellulose are essential and main components, and the effect is further increased if higher fatty acids or water are used in combination with these if necessary.

In the present invention, when a higher fatty acid such as stearic acid or palmitic acid is used as an optional component, a more preferable effect is exhibited. The melting point of 70 ⁰ C or less paraffin wax contained as a main component, when used in combination higher fatty as an optional component, also improve the removal effect by increasing the permeability of the removing agent added in a small amount by their synergistic effect. The content of the higher fatty acid in the remover is 0.5 to
5.0% (outside weight / weight relative to the main component drug) is appropriate.

In the case of using the removing agent according to the present invention, even when only the main component or a higher fatty acid is added, the stain can be removed usually within 10 minutes by applying to the soil by gas. When it is desired to maintain and maintain the removal performance for one hour or more, it can be achieved by adding water of 1.0 to 20%, preferably 5 to 10% (external amount / weight relative to the main component drug).

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The removing agent having the composition according to the present invention comprises:
It is applied to a dirt surface in a mold directly with a rag or brush, and is used after several minutes to wipe off the dirt, so that dirt can be easily removed in a short time. Furthermore, in order to further simplify and facilitate the use of the present removing agent, it is efficient to add a suitable propellant to the present composition and commercialize it into a spray can. The propellant (propellant) may be any of the above-mentioned main components or a mixed composition obtained by further adding higher fatty acids or water as an optional component, as long as it does not cause chemical deterioration. conventional propellants, for example chlorofluorocarbons, butane, but liquefied gas such as propane may also be used, Jimechirue - ether (boiling point; -25 ⁰ C) low-boiling organic compounds such as can be effectively used. Since the boiling point of dimethyl ether is very low, when it is sprayed on the inner surface of a dirty mold, it immediately volatilizes, and only the removing agent component is applied to the soil in the form of a mist, so that the removing agent does not flow or drip. Dimethyl ether used
The amount of tellur is suitably from 20 to 50% (outer number and weight) of the removing agent.

Hereinafter, a composition for removing stains due to gas adhering to a resin mold according to the present invention will be described.
This will be specifically described with reference to examples.

[0018]

Example 1 (Blended drug) (Blending amount / weight notation method) Methanol (commercially available reagent) 150 parts (15.4%) Methylcellulose (Shin-Etsu Chemical Metropolis SM) 6 parts (0.0%) After 6%) paraffin wax (Nippon Oil melting point 67 ⁰ C) 20 parts (2.1%) the above agents, at 80 ⁰ C, and stirred for 1 hour, methylene chloride (commercially available reagent) and 800 parts (81. 9%) added, at 60 to 70 ⁰ C, after a further stirring, and then cooled to room temperature. This liquid was colorless and transparent, and had a viscosity of 90 cps. The liquid was applied to a stain caused by gas adhering to the molding die of the ABS resin with a brush, and wiped with a rag after about 5 minutes. As a result, the stain could be easily and neatly removed.

[0019]

Example 2 (Blended drug) (Blended amount / weight indication) Methanol (commercially available reagent) 150 parts (15.4%) Hydroxypropyl * Metrolose 60 * * Methylcellulose (Shin-Etsu Chemical * SH4000) 3 parts (0.3%) paraffin wax Nippon Petroleum, melting point 67 ⁰ C) 20 parts (2.1%) After stirring the above agent at 80 ⁰ C for 1 hour, methylene chloride (commercially available reagent) It added 800 parts (82.2%), at 60 to 70 ⁰ C, after a further stirring, and then cooled to room temperature. This liquid was colorless and transparent, and had a viscosity of 120 cps. The liquid was applied to dirt caused by gas adhering to a molding die of ABS resin, and was wiped with a rag after about 3 minutes. As a result, the dirt could be easily removed.

[0020]

Examples 3 to 7 (Effects of Types and Mixing Amounts of Alcohols) Experiments were conducted with different types of alcohols and mixing ratios. The blending procedure and blending conditions are substantially the same as in Examples 1 and 2. The results are shown in Table 1 below. The alcohols tested were all effective, and methanol showed particularly good results.

[0021]

(Table 1) (Compounding ratio / numbers indicate parts by weight) (Combined drug) Example 3 Example 4 Example 5 Example 6 Example 7メ タ Methanol 150 100-250-Ethanol--150--Isopropyl alcohol----150 Hydroxypropyl-methylcellulose 3 3 3 3 3 Paraffin wax 20 20 20 20 20 Methylene chloride 750 800 750 650 750時間 Time (minutes) for removing dirt 3 3 4 5 5

[0022]

Examples 8 to 10 (Effects of Amount and Viscosity of Methyl Cellulose) The effects described above were examined using hydroxypropyl methyl cellulose. The drug compounding ratio is shown in Table 2 below, and the compounding procedure was the same as in Examples 1 and 2. As shown in Table 2, in each case, a good stain removing effect was recognized in a short time.

[0023]

(Compounding ratio / numbers indicate parts by weight) (Combined drug) Example 8 Example 9 Example 10 {Methanol 150 150 150 Paraffin wax 20 20 20 Hydroxypropyl-methylcellulose 1.5 5.0 10.0 Methylene chloride 750 750 750}時間 Time (minutes) for removing dirt 3 5 6

[0024]

Examples 11 to 14 (Types of paraffin wax,
Influence of amount and amount of stearic acid) Choose three types of paraffin wax,
When stearic acid was further used as a higher fatty acid in combination with one of them, the viscosities of these blended liquids and the performance when they were used as a remover were tested.
The compounding procedure is as shown in Examples 1 and 2 above. The test results are shown in Table 3 below. As is clear from the table, Example 12,
From the comparison of Example 13, it was found that the viscosity could be adjusted by the compounding wax, and from the comparison of Examples 11 and 14, it was found that the addition of higher fatty acids reduced the viscosity and improved the performance. Note: In the table, the type of wax component is indicated as [120 ⁰ F paraffin wax] by Nippon Oil Co., Ltd., and the temperature is indicated in the text and examples in [ ⁰ C].
Since confusing and the case of stocks displaying only omitted ^[0 F], simply displaying only [120 paraffin wax]. Other brands and the following Table 4 are similarly displayed.

[0025]

[Table 3] (Compounding ratio / numerical values are indicated by weight) (Combined drug) Example 11 Example 12 Example 13 Example 14メ タ Methanol 150 150 150 150 150 Hydroxypropyl-methylcellulose 33 33 33 120 Paraffin wax 10--20 135 Same as above-20--115 Same as above--20 − Methylene chloride 750 750 750 750 Stearic acid − − − 10 がRemoval time (minutes) 3 4 3 2

[0026]

[Examples 15, 16, 17] (Persistence of water addition and removal performance) Table 4 shows the results of tests on the presence or absence of addition of hydroxypropylmethylcellulose and the case where water was further used in combination. Is described. The compounding procedure of the drug and the like are as shown in Examples 1 and 2. As is clear from Table 4, the compounding of hydroxypropyl methylcellulose has the effect of delaying the volatilization of the drug component and prolonging the duration of the medicinal effect, and the addition of water synergistically increases the duration. We found that it was effective.

[0027]

[Table 4] (Compounding ratio / numbers indicate parts by weight) (Combined drug) Example 15 Example 16 Example 17 {Methanol 150 150 150 Hydroxypropyl-methylcellulose 0 33 120 Paraffin wax 20 20 20 Methylene chloride 750 750 750 Water 0 05}蒸 発 Evaporation time (min) 20 60 180

[0028]

Example 18 (Addition of a propellant) A remover composition A according to the present invention was prepared according to the following formulation. (Removing agent composition A) (Blending agent) (Blending amount) Methanol (commercially available reagent) 150 parts by weight Hydroxypropyl Metrol 60-Methylcellulose (-SH4000 manufactured by Shin-Etsu Chemical) 3 parts 120 Paraffin wax (Japan) the oil manufactured melting point 67 ⁰ C) 20 parts the above agents, at 80 ⁰ C, After stirring for 1 hour, methylene chloride (blended commercial reagents) 750 parts to prepare a composition a. (Removing agent composition B) The above composition A was taken as 100%, and dimethyl ether was blended with 50% by weight.
This composition B was filled in a spray container.

The remover compositions A and B were tested for their effects on mold stains by the former method by the coating method and the latter by the spray method. The removal time is 3 for the removal agent.
And 2.5 minutes for the remover B. In both cases, a good stain removing effect was obtained, but in particular, the spraying method showed better results. This is interpreted as that the drug was applied in the form of a mist, finely and evenly throughout. In addition, since the spray can be sprayed with the hand extended, the workability was better.

[0030]

In the remover composition of the present invention, methylene chloride and alcohol are mainly effective in preventing contamination from gas from the mold, and paraffin wax and methylcellulose are used to increase the viscosity of the remover and reduce the viscosity. It is effective in suppressing evaporation of boiling components. When these are used as main components and higher fatty acids and water are optionally used in combination, there is an effect of synergistically improving the removal performance. When this remover is filled into a spray can together with a propellant and sprayed, the use is simplified, the uniform application of the remover is improved, and the permeability and the removal effect are further enhanced.

As described above, the gas-based soil remover composition of the present invention is excellent in the permeability of the chemical between the gas-based soil and the mold surface and the swelling property of the soil itself.
Dirt can be easily removed by applying a remover or wiping it several minutes after spraying. In addition, since the viscosity and the volatility are appropriately adjusted at the time of application, they do not flow or droop from the application site. Furthermore, even if left after coating, the evaporation of the low-boiling components is suppressed, so that the removal performance does not decrease. The effect can be maintained for a long time. Since no corrosive chemical is used as the chemical, it does not have any corrosive action on the mold, and conversely, it can be used safely without rust due to the effect of the residual wax.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ identification code FI C11D 7:30) (56) References JP-A-5-104539 (JP, A) JP-A-1-216809 (JP, A) JP-A-1-204999 (JP, A) JP-A-62-184060 (JP, A) JP-A-61-235500 (JP, A) JP-A-61-159499 (JP, A) JP-A-58-119828 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 33/72

Claims (11)

(57) [Claims] 1. A composition for removing dirt due to gas adhering to a resin molding die, comprising, as main components, methylene chloride, methylcellulose, an alcohol compatible with methylene chloride, and paraffin wax. 2. The resin according to claim 1, comprising methylene chloride, methylcellulose, an alcohol compatible with methylene chloride, and paraffin wax as a main component, and blending a higher fatty acid or water as required. A composition for removing dirt due to gas adhering to a molding die. 3. Methylene chloride 50% by weight (hereinafter referred to as% by weight)% or more, methylcellulose 0.1 to 2.0%, alcohol 10 to 30% compatible with methylene chloride, melting point
75 ° C. 0.5 to 5.0% or less of the paraffin wax, and is characterized by containing a higher fatty acid 0.5 to 5.0%, adhesion to the resin mold according to claim 1 or 2 A composition for removing stains caused by a gas. 4. A methyl cellulose ethers is characterized in that it is a hydroxypropylmethylcellulose, claim
Attached to the resin molding die according to any one of 1, 2, and 3
A composition for removing stains caused by deposited gas. 5. The method according to claim 1, wherein the alcohol is methanol, ethanol,
Select from the group consisting of isopropyl alcohol and butanol
Characterized in that it is intended to be-option, according to claim 1,
Adhering to the resin molding die according to any of 3 or 4
A composition for removing dirt caused by gas . 6. A paraffin wax is characterized in that it is a less paraffin wax mp 70 ° C., according to claim 1
The gas adhering to the resin molding die according to any one of (1) to (5),
Remover composition. 7. Methylene chloride 50 weight (hereinafter referred to as weight)
% Or more, 0.1-2.0% of methylcellulose, 10-30% of alcohol compatible with methylene chloride, melting point of 75 %
° C. 0.5 to 5.0% or less of the paraffin wax, and is characterized in that it contains 1-20% water, according to claim 1 or
3. A composition for removing stains caused by gas adhering to a resin molding die as described in the item 2. 8. methylcellulose such removal compositions of contamination with gas adhering to the resin molding mold according to claim 7, characterized in that the hydroxypropylmethylcellulose. 9. The alcohol is methanol, ethanol,
Select from the group consisting of isopropyl alcohol and butanol
9. The method according to claim 7, wherein
8. A composition for removing stains caused by gas adhering to the resin molding die according to 8. 10. Paraffin waxes are characterized by a melting point of 70 ° C. or less paraffin wax, claim
Attaching to the resin molding die according to any one of 7, 8, and 9
A composition for removing stains caused by deposited gas . 11. The method according to claim 1, wherein the remover composition further comprises 20 to 50% of dimethyl ether.
And adhering to the resin molding die according to any one of claims 10 to 10.
A composition for removing dirt caused by gas.