[0298]
[0299] In the same manner as in Example 1, a mixture containing (A) a radically reactive resin and (B) a radically polymerizable unsaturated monomer in the ratio shown in Table 2 was obtained.
[0300] [Table 2]
[0301]
[0302] In the styrene column in Table 2, each (A) radical reactive resin of (A1-1) (A1-2) (A4-1) above and (B) radical polymerizable unsaturated monomer The styrene content previously contained in the mixture of and the styrene content as the (B) radically polymerizable unsaturated monomer added as necessary are summed and described.
[0303] In addition, in the column of (A) radical reactive resin in Table 2, only (A) in the mixture calculated from the addition amount of the raw materials used in the production of the mixture of (A) component and (B) component is described. The content of free radical reactive resin. (A) The content of the radical-reactive resin is calculated by considering that 100% of the raw materials used in the production of the mixture are reacted. In addition, in the column of (B) radically polymerizable unsaturated monomers in Table 2, only one of the mixtures calculated from the addition amount of the raw materials used in the production of the mixture of (A) component and (B) component (B) The content of radically polymerizable unsaturated monomers. (B) The content of the radically polymerizable unsaturated monomer is calculated by considering that 100% of the raw materials used in the production of the mixture are reacted.
[0304] Next, (C) a mercapto group-containing compound, (D) an imidazole compound, and (E) an organic peroxide based on a total of 100 parts by mass of (A) radically reactive resin and (B) radically polymerizable unsaturated monomer The materials were sequentially added in the ratio shown in Table 2 and stirred to obtain a resin composition (carbon fiber-reinforced resin composition) not containing (F) carbon fibers.
[0305] For each carbon fiber-reinforced resin composition obtained in this way, the gelation time, curing time, and curing temperature were measured in the same manner as in Example 1, and the curability was evaluated in an environment of 80°C. The results are shown in Table 2. In addition, in Table 2, the evaluation of the curability of Example 1 is also shown together.
[0306] As shown in Table 2, it can be seen that the gelation time and curing time of the resin compositions of Examples 8 to 9 are short, and can be cured efficiently even at a low curing temperature.
[0307] In contrast, the resin composition of Comparative Example 2 using biimidazole as the (D) imidazole compound has a longer gelation time and curing time than the resin compositions of Examples 1, 8, and 9.
[0308]
[0309] In an environment of 25°C, with respect to 100 parts by mass of the mixture of (A) radically reactive resin and (B) radically polymerizable unsaturated monomer shown in Table 2, the (D) imidazole compound is as shown in Table 2 Add in the proportion to stir. Furthermore, the aforementioned (D) component was added to the mixture of the aforementioned (A) component and the aforementioned (B) component, and 2 minutes after the start of stirring, the state of the resin composition was visually observed, and the aforementioned (D) was evaluated by the following criteria: ) The solubility (compatibility) of the ingredients. The results are shown in Table 2.
[0310] "Solubility Evaluation Criteria"
[0311] ○: Dissolved.
[0312] △: Transparent, and some crystals remaining after being dissolved are suspended.
[0313] ×: The component (D) is not dissolved, and the crystals are suspended and turbid.
[0314] The resin composition in which the said (D) component was added to the mixture of the said (A) component and the said (B) component in a 25 degreeC environment, and it stirred for 2 minutes was made into a test body. For each test body, according to JIS K 7361 and K 7136, the transmittance was measured using a haze meter HM-150 manufactured by Murakami Color Research Institute, and a haze test was performed. The thickness of the cell at the time of measurement was 1 cm. About the transmittance and the haze, each test body was measured 3 times, and the average value of the obtained result was used for the evaluation shown in Table 2.
[0315] As shown in Table 2, the resin composition of Example 1 using 2-ethyl-4-methylimidazole as (D) imidazole compound, and 1-benzyl-2-methylimidazole as (D) imidazole The resin composition of Example 8 of the compound and the resin composition of Example 9 using 2-methylimidazole as the (D) imidazole compound were evaluated for solubility of ○ or △, and were transparent. In addition, as shown in Table 2, the resin compositions of Example 1, Example 8, and Example 9 have high transmittance and low haze.
[0316] Therefore, it can be seen that the (D) imidazole compound having only one imidazole ring used in Examples 1, 8, and 9 is compatible with (A) radically reactive resin and (B) radically polymerizable unsaturated monomer. Excellent capacitance.
[0317] In particular, as the (D) imidazole compound, the resin composition of Example 1 using 2-ethyl-4-methylimidazole and the resin composition of Example 8 using 1-benzyl-2-methylimidazole Suspended crystals were not confirmed in the composition, and the solubility evaluation was good.
[0318] In contrast, the resin composition of Comparative Example 2 using biimidazole having two imidazole rings as the (D) imidazole compound has low transmittance and high haze compared to the resin compositions of Examples 1, 8, and 9 .
