Abstract: A The four-wheel steering control system includes a front drive axle, a front drive cylinder, a rear drive axle, a rear drive cylinder, a first reversing valve, a second reversing valve, and a switch valve. The front drive cylinder is drivingly connected to the front drive axle, and the rear drive cylinder is drivingly connected to the rear drive axle. A first working oil port of the first reversing valve communicates with one oil chamber of the front drive cylinder. A second working oil port of the first reversing valve communicates with an oil inlet of the second reversing valve. An oil return port of the second reversing valve communicates with another oil chamber of the front drive cylinder. Two working oil ports of the second reversing valve communicate with two oil chambers of the rear drive cylinder one to one.

Abstract: The present invention relates to a class of magenta dyes, their preparation methods and applications. The magenta dyes include the compounds which simultaneously contain carboxyl group, sulfonic acid group and the carbonyl propyl sulfurylsulfonic acid on the anthrapyridone skeleton, showing in the form of general formula (I) or their mixtures. In the general formula (I): A may be cation M4, or substituted or unsubstituted benzyl group, or substituted or unsubstituted naphthyl methyl; M1, M2, M3 are respectively cation or cationic groups; Sulfonic acid group (SO3M2)m may located any position of the benzene ring, of which m is an integer of 0-2. As containing carboxyl (or carboxylic benzyl ester or naphthoate), sulfonic acid groups and carbonyl propyl sulfuryl simultaneously, the magenta dyes of the present invention feature outstanding tone, brightness, light resistance, water resistance, ozone resistance as well as solubility and solution stability, etc.

Abstract: The present invention relates to a class of compounds of general formula (I) or their salts of general formula (II): In formula (I)-(II), the substituents (A)p and (SO3H)n on the benzene ring are at the ortho, meta or para position, n is 0-2, and p is 0-3; M is selected from Li+, Na+, K+, NH4+ or organic ammonium salt N+R1R2R3R4, where R1, R2, R3, R4 are the same or different H, C1-18 alkyl groups, cyclohexyl groups, CH2CH2OH, CH(CH3)CH2OH or benzyl groups; where p>0, A stands for the same or different groups selected from: H, CN, NO2, NH2, F, Cl, Br, C1-18 alkyl group, cyclohexyl group, phenyl group, benzyl group, phenoxy group, C1-18 alkoxy group, C1-18 alkylthio group, SO2CH?CH2, SO2CH2CH2A1, NR6COR5 or NR6SO2R5.

Abstract: The present invention relates to a class of magenta dyes, their preparation methods and applications. The magenta dyes include the compounds which simultaneously contain carboxyl group, sulfonic acid group and the carbonyl propyl sulfurylsulfonic acid on the anthrapyridone skeleton, showing in the form of general formula (I) or their mixtures. In the general formula (I): A may be cation M4, or substituted or unsubstituted benzyl group, or substituted or unsubstituted naphthyl methyl; M1, M2, M3 are respectively cation or cationic groups; Sulfonic acid group (SO3M2)m may located any position of the benzene ring, of which m is an integer of 0-2. As containing carboxyl (or carboxylic benzyl ester or naphthoate), sulfonic acid groups and carbonyl propyl sulfuryl simultaneously, the magenta dyes of the present invention feature outstanding tone, brightness, light resistance, water resistance, ozone resistance as well as solubility and solution stability, etc.

Abstract: The present invention relates to compounds shown in the general formula (I) or (III), the salts thereof or their mixtures, as well as their preparation method and application. In the general formula (I), X1 is H or CO2H; X2 is OH or phenyl group with 0-2 sulfonic acid substituents, and the sulfonic acid substituents are located at random positions of a benzene ring; when X2 is OH, X1 is H; when X2 is phenyl group with 0-2 sulfonic acid substituents, X1 is H or CO2H; n is an integer of 0-2; and in the general formula (III), n and m are respectively an integer of 0-2. The compounds and the mixtures not only have improved light resistance, ozone resistance and water resistance, but also have excellent water solubility and long-term stability in ink-jet ink.

Abstract: The present invention relates to a class of compounds of general formula (I) or their salts of general formula (II): In formula (I)-(II), the substituents (A)p and (SO3H)n on the benzene ring are at the ortho, meta or para position, n is 0-2, and p is 0-3; M is selected from Li+, Na+, K+, NH4+ or organic ammonium salt N+R1R2R3R4, where R1, R2, R3, R4 are the same or different H, C1-18 alkyl groups, cyclohexyl groups, CH2CH2OH, CH(CH3)CH2OH or benzyl groups; where p>0, A stands for the same or different groups selected from: H, CN, NO2, NH2, F, Cl, Br, C1-18 alkyl group, cyclohexyl group, phenyl group, benzyl group, phenoxy group, C1-18 alkoxy group, C1-18 alkylthio group, SO2CH?CH2, SO2CH2CH2A1, NR6COR5 or NR6SO2R5.

Abstract: The present invention relates to compounds shown in the general formula (I) or (III), the salts thereof or their mixtures, as well as their preparation method and application. In the general formula (I), X1 is H or CO2H; X2 is OH or phenyl group with 0-2 sulfonic acid substituents, and the sulfonic acid substituents are located at random positions of a benzene ring; when X2 is OH, X1 is H; when X2 is phenyl group with 0-2 sulfonic acid substituents, X1 is H or CO2H; n is an integer of 0-2; and in the general formula (III), n and m are respectively an integer of 0-2. The compounds and the mixtures not only have improved light resistance, ozone resistance and water resistance, but also have excellent water solubility and long-term stability in ink-jet ink.