Emulsion coagulant, and flat tire repair kit using same

Abstract

An object of the present invention is to provide a novel emulsion coagulant having excellent coagulability used in a tire puncture sealing agent, and a tire puncture repair kit that uses the same. The present invention is an emulsion coagulant comprising magnesium oxide and a silane coupling agent and a cellulose and/or magnesium hydroxide, wherein a mass ratio of the magnesium oxide to the silane coupling agent is from 100:0.5 to 100:15; and a tire puncture repair kit that uses the same.

Claims

1. A tire puncture repair kit comprising an emulsion coagulant and a tire puncture sealing agent, the emulsion coagulant including magnesium oxide and a silane coupling agent, and at least one selected from the group consisting of a cellulose and magnesium hydroxide, a mass ratio of the magnesium oxide to the silane coupling agent being from 100:0.5 to 100:15.

2. An emulsion coagulant comprising magnesium oxide and a silane coupling agent and at least one selected from the group consisting of a cellulose and magnesium hydroxide, wherein the silane coupling agent is at least one type selected from the group consisting of a compound having a methacryloxy group and at least one type selected from the group consisting of a dimethoxysilyl group, a trimethoxysilyl group, a diethoxysilyl group, and a triethoxysilyl group, tetramethoxysilane, and tetraethoxysilane, a mass ratio of the magnesium oxide to the silane coupling agent being from 100:0.5 to 100:15, wherein a mass ratio of the magnesium oxide to the at least one selected from the group consisting of a cellulose and magnesium hydroxide is from 100:40 to 100:400.

3. The emulsion coagulant according to claim 2, wherein the magnesium oxide and the silane coupling agent and the at least one selected from the group consisting of a cellulose and magnesium hydroxide are packaged in a batch.

4. A tire puncture repair kit comprising the emulsion coagulant described in claim 2 and a tire puncture sealing agent.

Description

EXAMPLES

(1) The present invention is described below in detail using working examples. However, the present invention is not limited to such working examples.

(2) <Evaluation>

(3) The following evaluations were performed using the emulsion coagulants produced as follows. The results are shown in the tables. Note that the arrows in the evaluation result in the tables mean that the evaluation result of gelling time of that sample was the same as the result of sample 24.

(4) Gelling Time

(5) 10 g of the emulsion coagulant produced as follows was added to 100 g of puncture repair material (tire puncture sealing agent; puncture repair liquid in the tables), and after mixing, the time (unit: min) until the mixed solution gelled was measured.

(6) Storage Stability

(7) Emulsion coagulants produced as follows were put in containers, and after nitrogen gas replacement, the containers were sealed. After being stored for 6 months at 80° C., storage stability was evaluated. If an emulsion coagulant was in the powdered state and could be easily dispersed in the puncture repair material, it was judged “excellent.” If an emulsion coagulant was even partially solidified and did not disperse in the puncture repair material, it was judged “fail.”

(8) <Production of Emulsion Coagulants>

(9) Emulsion coagulants were produced by stirring and uniformly mixing the components shown in the tables below in the amounts (parts by mass) shown in the same tables. Note that the arrows in the components in the tables mean that in that sample, the component in that cell was used in the amount pointed to by the arrow.

(10) TABLE-US-00001 TABLE 1 Sample no. 1 2 3 4 5 6 7 8 Comparative Example Working Example Magnesium Reagent 100 ← ← ← ← ← ← ← oxide Silane Methacryloxypropyltrimethoxysilane 0 0.5 1 2 4 4.5 10 14 coupling agent Cellulose CM cellulose 100 ← ← ← ← ← ← ← Na (reagent) Time until −20° C. >60 60 30 25 25 40 45 45 gelling after  20° C. >30 25 15 15 10 15 30 30 10 g of  70° C. >30 25 10 10 5 10 20 15 emulsion coagulant was added to 100 g of puncture repair liquid (min) Storage  80° C., 6 months Fail Fail Excellent Excellent Excellent Excellent Excellent Excellent stability Sample no. 9 10 11 12 13 14 15 16 17 Comparative Comparative Example Working Example Example Magnesium Reagent 100 0 100 ← 100 100 100 100 100 oxide Silane Methacryloxypropyl- 20 2 4 5 3 3 1.43 1.25 1.00 coupling trimethoxysilane agent Cellulose CM cellulose 100 200 380 380 233 150 42.9 25 0 Na (reagent) Time until −20° C. >60 >60 30 45 30 25 20 45 >60 gelling after  20° C. >30 >30 15 30 15 15 15 30 >30 10 g of  70° C. >30 >30 15 20 10 10 5 30 >30 emulsion coagulant was added to 100 g of puncture repair liquid (min) Storage  80° C., 6 months Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent Excellent stability

(11) TABLE-US-00002 TABLE 2 Sample no. 4 18 19 20 21 22 23 Working Example Magnesium oxide Reagent 100.0 ← ← ← ← ← ← Silane coupling agent Methacryloxypropyltrimethoxysilane 2.0 Methacryloxypropyldimethoxysilane 2.0 Methacryloxypropyltriethoxysilane 2.0 Methacryloxypropyldiethoxysilane 2.0 Methacryloxypropyldipropoxysilane 2.0 Tetramethoxysilane 2.0 Tetraethoxysilane 2.0 Alumina Reagent Magnesium hydroxide Reagent Cellulose CM cellulose Na (reagent) 100.0 ← ← ← ← ← ← Time until gelling −20° C. 25 20 25 20 45 20 20 after 10 g of  20° C. 15 15 15 10 30 10 10 emulsion coagulant  70° C. 10 5 15 5 20 5 5 was added to 100 g of puncture repair liquid (min) Storage stability  80° C., 6 months Excellent Excellent Excellent Excellent Excellent Excellent Excellent Sample no. 24 25 26 27 28 29 30 Comparative Example Magnesium oxide Reagent Silane coupling agent Methacryloxypropyltrimethoxysilane 2 Methacryloxypropyldimethoxysilane 2.0 Methacryloxypropyltriethoxysilane 2.0 Methacryloxypropyldiethoxysilane 2.0 Methacryloxypropyldipropoxysilane 2.0 Tetramethoxysilane 2.0 Tetraethoxysilane 2.0 Alumina Reagent 100.0 ← ← ← ← ← ← Magnesium hydroxide Reagent Cellulose CM cellulose Na (reagent) 100.0 ← ← ← ← ← ← Time until gelling −20° C. >60 ← ← ← ← ← ← after 10 g of  20° C. >30 ← ← ← ← ← ← emulsion coagulant  70° C. >30 ← ← ← ← ← ← was added to 100 g of puncture repair liquid (min) Storage stability  80° C., 6 months Excellent Excellent Excellent Excellent Excellent Excellent Excellent

(12) TABLE-US-00003 TABLE 3 Sample no. 31 32 33 34 35 36 37 Working Example Magnesium oxide Reagent 100 ← ← ← ← ← ← Silane coupling agent Methacryloxypropyltrimethoxysilane 2 Methacryloxypropyldimethoxysilane 2.0 Methacryloxypropyltriethoxysilane 2.0 Methacryloxypropyldiethoxysilane 2.0 Methacryloxypropyldipropoxysilane 2.0 Tetramethoxysilane 2.0 Tetraethoxysilane 2.0 Alumina Reagent Magnesium hydroxide Reagent 100.0 ← ← ← ← ← ← Cellulose CM cellulose Na (reagent) Time until gelling after −20° C. 20 25 20 25 45 20 25 10 g of emulsion  20° C. 15 15 15 15 30 10 10 coagulant was added to  70° C. 15 15 10 10 30 10 10 100 g of puncture repair liquid (min) Storage stability 80° C., 6 months Fail Fail Fail Fail Fail Fail Fail

(13) TABLE-US-00004 TABLE 4 Sample no. 19 38 39 40 41 Working Example Magnesium oxide Reagent 100 ← ← ← 100 Silane coupling Methacryloxypropyltriethoxysilane 2 ← ← ← ← agent Cellulose CM cellulose Na (reagent) 100 CM cellulose NH4 (reagent) 100 Cellulose fiber (reagent) 100 Waste paper cellulose 100 380 (manufactured by Sankyo Seifun) Time until −20° C. 25 20 20 20 25 gelling after 10 g  20° C. 15 15 10 10 20 of emulsion  70° C. 15 10 10 5 10 coagulant was added to 100 g of puncture repair liquid (min) Storage stability 80° C., 6 months Excellent Excellent Excellent Excellent Excellent Sample no. 42 43 44 45 Working Example Magnesium oxide Reagent 100 ← ← ← Silane coupling Methacryloxypropyltriethoxysilane 2 ← ← ← agent Cellulose CM cellulose Na (reagent) CM cellulose NH4 (reagent) Cellulose fiber (reagent) Waste paper cellulose (manufactured by 430 150 42 35 Sankyo Seifun) Time until −20° C. 40 20 20 45 gelling after 10 g  20° C. 30 10 10 30 of emulsion  70° C. 30 5 5 25 coagulant was added to 100 g of puncture repair liquid (min) Storage stability 80° C., 6 months Excellent Excellent Excellent Excellent

(14) The details of each of the components shown in Tables 1 to 4 are as follows. Magnesium oxide: reagent Methacryloxypropyltrimethoxysilane: trade name KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd. Methacryloxypropyldimethoxysilane: trade name KBM-502, manufactured by Shin-Etsu Chemical Co., Ltd. Methacryloxypropyltriethoxysilane: trade name KBE-503, manufactured by Shin-Etsu Chemical Co., Ltd. Methacryloxypropyldiethoxysilane: trade name KBE-502, manufactured by Shin-Etsu Chemical Co., Ltd. Methacryloxypropyldipropoxysilane: reagent, manufactured by Wako Pure Chemical Industries, Ltd. Tetramethoxysilane: reagent, manufactured by Wako Pure Chemical Industries, Ltd. Tetraethoxysilane: reagent, manufactured by Wako Pure Chemical Industries, Ltd. CM cellulose Na: carboxymethylcellulose sodium salt, reagent, weight average molecular weight 500,000 CM cellulose NH.sub.4: carboxymethylcellulose ammonium salt, reagent, weight average molecular weight 500,000 Cellulose fiber: trade name Super Jet Fiber, manufactured by Nippon Paper Lumber Co., Ltd. Waste paper cellulose: trade name RNP2, manufactured by Sankyo Seifun Co., Ltd. Alumina: aluminum oxide, reagent Magnesium hydroxide: reagent Tire puncture repair liquid: Contained a synthetic resin emulsion as an emulsion and an antifreeze agent (propylene glycol). The solid content of the emulsion was 25 mass % in the tire puncture repair liquid. The amount of antifreeze agent was prepared at 200 mass % of the solid content of the emulsion.

(15) As is clear from the results shown in Tables 1 to 4, in sample 1, which did not contain a silane coupling agent, sample 9, in which the amount of silane coupling agent exceeded 15 parts by mass per 100 parts by mass of magnesium oxide, samples 10 and 24 to 30, which did not contain magnesium oxide, and sample 17, which did not contain a cellulose, coagulability was low because coagulation took more time than the predetermined time or because it did not coagulate.

(16) In contrast, samples 2 to 8, 11 to 16, 18 to 23, and 31 to 45 had excellent coagulability. Furthermore, these samples had excellent coagulability even when used in a puncture repair liquid containing an antifreeze agent. Therefore, they are thought to exhibit excellent coagulability on puncture repair liquids not containing antifreeze agents as well.

(17) Among them, samples 3 to 5, 11, and 13 to 16, in which the mass ratio of magnesium oxide to silane coupling agent was from 100:1 to 100:4, had better coagulability than samples 2, 6 to 8, and 12.

(18) Furthermore, samples 4, 18 to 20, 22, and 23, in which the silane coupling agent was at least one type selected from the group consisting of a compound having a dimethoxysilyl group, a trimethoxysilyl group, a diethoxysilyl group, a triethoxysilyl group, and a methacryloxy group, tetramethoxysilane, and tetraethoxysilane, had better coagulability than sample 21. The results were the same for samples 31 to 34, 36, and 37 compared to sample 35.

(19) Samples 2 to 8 and 11 to 15, in which the mass ratio of magnesium oxide to cellulose or magnesium hydroxide was from 100:40 to 100:400, had better coagulability than sample 16.

(20) Emulsion coagulability containing a cellulose and having a mass ratio of silane coupling agent to magnesium oxide not less than 1 silane coupling agent to 100 magnesium oxide (samples 3 to 8, 11 to 16, 18 to 23, 38 to 45) had better storage stability than emulsion coagulability containing magnesium hydroxide (samples 31 to 37) and emulsion coagulability having a mass ratio of silane coupling agent to magnesium oxide less than 1 silane coupling agent to 100 magnesium oxide (sample 2).