A kind of synthetic fatliquoring agent and preparation method thereof

Abstract

The invention belongs to the technical field of the leather chemical industry, and discloses composite fatliquor and a preparation method thereof. Long carbon alkane, maleic anhydride, high-carbon alcohol and fatty alcohol-polyoxyethylene ether serve as raw materials. Firstly, the long carbon alkane and maleic anhydride are subjected to a grafting reaction; then, the high-carbon alcohol and the fatty alcohol-polyoxyethylene ether are subjected to an esterification reaction with the excessive maleic anhydride; and finally, the composite fatliquor is obtained by sulfonating sodium sulfite and adjusting pH and solid contents. According to the preparation method of the composite fatliquor, the self-emulsifying performance of the long carbon alkane is improved through graft modification, and the application of the raw materials in the leather fatliquor is widened significantly. The composite fatliquor is good in dielectric resistance; after fatliquoring, leather is light, puffy, soft and free of peculiar smell and has a certain waterproof effect.

Description

technical field

[0001] The invention relates to a synthetic fatliquoring agent and a preparation method thereof, belonging to the technical field of leather chemical industry. Background technique

[0002] Natural oil-based fatliquor using natural oil and its chemically modified derivatives occupies a very important position and a large proportion in leather fatliquor, among which sulfated fatliquor, oxidized sulfited fatliquo There are three main types of chemical fatliquor. However, there are unstable inherent defects in the structure of natural oils: rich in unsaturated double bond fatty acids and easy to oxidize and rancid, resulting in peculiar smell of leather. For example, leather that is fatliquored with lard raw material fatliquor is prone to produce a "harsh smell" due to oxidative rancidity of lard. Leather fatliquored with fish oil fatliquor tends to develop a "fishy smell". In addition, studies have shown that fatliquors containing one or more unsaturated dou...

Examples

Embodiment 1

[0039] First, 100g of vaseline and 98g of maleic anhydride are added in proportion to the reactor, protected by nitrogen gas, and the dibenzoyl peroxide initiator whose total consumption accounts for 5g of long-carbon paraffins is added in equal amounts in 6 times, with an interval of 20 minutes each time. , Reaction at 80°C for 2h. Then add 58g of C12-C14 mixed alcohol (hydroxyl value 290) and keep warm at 100°C for 1 hour; add 270g Pingpingjia O-3 (hydroxyl number 145) and continue the heat preservation reaction for 1 hour. Then add a saturated solution containing 126g of sodium sulfite and react at 85°C for 3h. Finally, the pH was adjusted to 6.5 with 25% liquid caustic soda, and the solid content was adjusted to 50% to obtain Synthetic Fatliquoring Agent 1.

Embodiment 2

[0041] First, 100g of vaseline and 98g of maleic anhydride are added in proportion to the reactor, protected by nitrogen gas, and the dibenzoyl peroxide initiator whose total consumption accounts for 4g of long-carbon paraffins is added in equal amounts in 6 times, with an interval of 20 minutes each time. , Reaction at 80°C for 2h. Then add 96.5g of C12-C14 mixed alcohol (hydroxyl value 290) and keep warm at 100°C for 1 hour; add 193.4g Pingpingjia O-3 (hydroxyl number 145) and continue to keep warm for 1 hour. Then add a saturated solution containing 110 g of sodium sulfite and react at 85° C. for 3 h. Finally, adjust the pH to 6.5 with 25% liquid caustic soda, and adjust the solid content to 50% to obtain the synthetic fatliquoring agent 2.

Embodiment 3

[0043] First 100g of solid paraffin and 98g of maleic anhydride are added in the reactor in proportion, and nitrogen protection is added, and the azobisisobutyronitrile initiator that the total consumption accounts for 5g of the long-carbon chain alkane consumption is added in equal amounts in 6 times, and each interval is 20 Minutes, react at 80°C for 2h. Then add 78.3g of C16-C18 mixed alcohol (hydroxyl value 215) and keep warm at 100°C for 1 hour; add 270g Pingpingjia O-3 (hydroxyl number 145) and continue to keep warm for 1 hour. Then add a saturated solution containing 115g of sodium sulfite and react at 85°C for 3h. Finally, the pH was adjusted to 7.0 with 25% liquid caustic soda, and the solid content was adjusted to 50% to obtain synthetic fatliquoring agent 3.

technical field

[0001] The invention relates to a synthetic fatliquoring agent and a preparation method thereof, belonging to the technical field of leather chemical industry. Background technique

[0002] Natural oil-based fatliquor using natural oil and its chemically modified derivatives occupies a very important position and a large proportion in leather fatliquor, among which sulfated fatliquor, oxidized sulfited fatliquo There are three main types of chemical fatliquor. However, there are unstable inherent defects in the structure of natural oils: rich in unsaturated double bond fatty acids and easy to oxidize and rancid, resulting in peculiar smell of leather. For example, leather that is fatliquored with lard raw material fatliquor is prone to produce a "harsh smell" due to oxidative rancidity of lard. Leather fatliquored with fish oil fatliquor tends to develop a "fishy smell". In addition, studies have shown that fatliquors containing one or more unsaturated dou...

Examples

Embodiment 1

[0039] First, 100g of vaseline and 98g of maleic anhydride are added in proportion to the reactor, protected by nitrogen gas, and the dibenzoyl peroxide initiator whose total consumption accounts for 5g of long-carbon paraffins is added in equal amounts in 6 times, with an interval of 20 minutes each time. , Reaction at 80°C for 2h. Then add 58g of C12-C14 mixed alcohol (hydroxyl value 290) and keep warm at 100°C for 1 hour; add 270g Pingpingjia O-3 (hydroxyl number 145) and continue the heat preservation reaction for 1 hour. Then add a saturated solution containing 126g of sodium sulfite and react at 85°C for 3h. Finally, the pH was adjusted to 6.5 with 25% liquid caustic soda, and the solid content was adjusted to 50% to obtain Synthetic Fatliquoring Agent 1.

Embodiment 2

[0041] First, 100g of vaseline and 98g of maleic anhydride are added in proportion to the reactor, protected by nitrogen gas, and the dibenzoyl peroxide initiator whose total consumption accounts for 4g of long-carbon paraffins is added in equal amounts in 6 times, with an interval of 20 minutes each time. , Reaction at 80°C for 2h. Then add 96.5g of C12-C14 mixed alcohol (hydroxyl value 290) and keep warm at 100°C for 1 hour; add 193.4g Pingpingjia O-3 (hydroxyl number 145) and continue to keep warm for 1 hour. Then add a saturated solution containing 110 g of sodium sulfite and react at 85° C. for 3 h. Finally, adjust the pH to 6.5 with 25% liquid caustic soda, and adjust the solid content to 50% to obtain the synthetic fatliquoring agent 2.

Embodiment 3

[0043] First 100g of solid paraffin and 98g of maleic anhydride are added in the reactor in proportion, and nitrogen protection is added, and the azobisisobutyronitrile initiator that the total consumption accounts for 5g of the long-carbon chain alkane consumption is added in equal amounts in 6 times, and each interval is 20 Minutes, react at 80°C for 2h. Then add 78.3g of C16-C18 mixed alcohol (hydroxyl value 215) and keep warm at 100°C for 1 hour; add 270g Pingpingjia O-3 (hydroxyl number 145) and continue to keep warm for 1 hour. Then add a saturated solution containing 115g of sodium sulfite and react at 85°C for 3h. Finally, the pH was adjusted to 7.0 with 25% liquid caustic soda, and the solid content was adjusted to 50% to obtain synthetic fatliquoring agent 3.

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