JPS5953247B2 - Kasozaiyou Alcohol - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention limits the carbon number and linear chain ratio of higher alcohol, which is a raw material for phthalate plasticizers commonly used for soft vinyl chloride resin, to within a certain range. The present invention relates to a raw alcohol composition that forms a plasticizer that exhibits superior performance to conventional general-purpose plasticizers.

In general, as alcohols used in phthalate yarn and molding agents for soft vinyl chloride resins, alcohols of approximately constant composition have conventionally been used depending on the use of these plasticizers.

That is, 2-ethylhexanol, which has 8 carbon atoms, is used as a raw material alcohol for plasticizers (general-purpose plasticizers) used for general purposes, and is produced in large quantities as a plasticizer. As mentioned above, 2-ethylhexanol has excellent properties on average as a raw material alcohol used for general-purpose plasticizers, and it is said that there are no particular drawbacks, and it is thought that there is no alcohol that is better than 2-ethylhexanol. However, no research and development has been conducted on alcohol compositions that can replace this.

However, rather than using a single component of alcohol as a raw material, if you try to use it as a mixture with other types of alcohol,
It may be able to exhibit better performance than 2-ethylhexanol. What is possible from a practical commercial perspective is an alcohol composition having an average carbon number of 7 to 8 and an average linearity within a certain range. Such alcohol compositions can also be obtained from oxo alcohols made from olefins having different carbon numbers and linear chain ratios. Performance required for a general-purpose plasticizer includes 3) tensile strength, elongation, 2) 100% modulus, 3) loss on heating, 4) cold resistance, and others, but in reality, loss on heating and cold resistance are particularly important as requirements for a general-purpose plasticizer. It has excellent performance.

In recent years, with the trend toward higher quality plastics, improvements in the performance of general-purpose plasticizers are desired. The present inventors have discovered that by mixing alcohols having 7 to 8 carbon atoms,
The present invention was completed by studying ways to further improve the performance of a general-purpose plasticizer obtained from -ethylhexanol.

As a result of examining the alcohol composition, heating loss, and cold resistance as a raw material for a general-purpose plasticizer, we found that a certain relational expression was formed between the carbon number and linear chain ratio of the raw alcohol, the amount of heating loss per q when used as a plasticizer, and the cold resistance. ) I found that it stands.

Based on this relational expression, the present invention proposes that a plasticizer with superior performance in terms of heat loss and cold resistance compared to commercially available general-purpose agents (for example, DOP) is a mixed alcohol having 7 to 8 carbon atoms. ) provides a synthesis method. The measurement results are shown in Table 1.

In the table, Tf indicates 1 coldness measured by the Kratschberg method.

However, the temperature is such that the rigidity G=3.17×103/Cd. Heating loss refers to the rate of weight loss when a sample is left at 100° C. for 120 hours.

As shown in Table 1, looking at the effect of the linear chain ratio on Tf, when the linear chain ratio increases from 0 to 1.0 for both C7 alcohol and C8 alcohol, Tf decreases by about 10°C.

On the other hand, looking at the effect of the number of carbon atoms at the same linear chain ratio, when the number of carbons increases by one, Tf decreases by about 1.0°C, X = 8, Y
When =0, Tf is -22.1°C, so assuming a linear relationship between Tf, the number of carbon atoms, and the straight chain ratio.

However, X: Number of carbon atoms in the alcohol composition 7x8 (average carbon number in the case of mixed alcohol) Y: Linear chain ratio (weight fraction) of the alcohol composition (average linear chain ratio in the case of mixed alcohol) 0 On the other hand, regarding the heating loss v, the following formula was assumed.

TOgv:Li:Ax+B2a, b are each a function of linear chain rate, and are set as 3=PY+Q8b:UY+V4.

Regarding n-hebutanol Y:1.0 Therefore, formula 3 is a:p-F-Q 4 formula is b:U+V becomes.

Substituting this into equation 2: TOg=-(p+q)X+(u+v) Here, substituting =5.8X=7: TOg5.8=-7P-7q+U+V5 Similarly, for branched heptanol, Y=0 ，
= 12.7, X = 7, so TOgl2.7 = -7q
+V6 In normal octanol, Y=1, V=2.1, is X
=8 and TOg2. For l=-8P-8q+U+V72-ethylhexanol, X=8, Y=0, V=5.
9, we get TOg5.9=-8q+V8.

Below are formulas 5 to 8! ) When P, q, u, v are found, P=0
．． 1083, q=0.3329,=3.434, u=0
．． 4178), equation 2 is TOgV=(0.4178-
0.1083X)Y-0.3329X+3.4349.

EXAMPLE Typical performance was measured for phthalate plasticizers synthesized from various alcohol compositions under exactly the same measurement conditions as shown in Table 1 above.

The obtained measurement results and calculation results using equations 1 and 9 are shown in Table 2, and they were in good agreement. From this example, it can be seen that the formulas 1 and 9, which were established based on several assumptions, are sufficiently practical for plasticizers with various alcohol compositions.

Here, the plasticizer with excellent heating loss like DOP is 9
Any mixed alcohol that satisfies the following inequality by substituting V=5.9 in the formula may be used. To make this relationship clearer, if you draw a range on a graph, it will look like Figure 1.

If the alcohol has the average linear chain ratio and average carbon number in the shaded area in Figure 1, a plasticizer can be obtained that has better heat loss and cold resistance than DOP.

[Brief explanation of drawings]

FIG. 1 shows the area of the alcohol composition according to the invention.

Claims (1)

[Scope of Claims] 1. An alcohol composition in which alcohol as a raw material for a phthalate plasticizer for soft vinyl chloride resin is within a range that satisfies the following formula. (0.1083Y+0.3329)X-0.4178Y
>2.6632 However, X: number of carbon atoms in alcohol 7<X<
8 (Average carbon number in case of mixed alcohol) Y: Straight chain ratio of alcohol (weight fraction) 0<Y<1