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Preparation method of modified polyurethane/AKD (Alkyl Ketene Dimer) sizing agent

A technology of sizing agent and polyurethane, which is applied in the direction of water-repellent addition, non-fiber pulp addition, papermaking, etc. It can solve the problems of oxygen barrier performance, poor paper strength, and unsatisfactory water resistance for a long time, and achieve good water resistance effect , the effect of simple preparation method

Pending Publication Date: 2022-07-01
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the most representative chemical for neutral sizing, AKD mainly provides water resistance, but its oxygen barrier performance and improvement of paper strength are poor, and its long-term water resistance is not satisfactory

Method used

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  • Preparation method of modified polyurethane/AKD (Alkyl Ketene Dimer) sizing agent
  • Preparation method of modified polyurethane/AKD (Alkyl Ketene Dimer) sizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Put 5g of 2,4-toluene diisocyanate, 80g of AKD, and 10g of polycaprolactone diol into a four-necked flask, heat up to 120°C, feed nitrogen to react for 2 hours; after the reaction, cool down to 85°C, add 9.5g The glacial acetic acid was stirred for 10 minutes, then 19g of coconut oil fatty acid was added to react for 4h; the reaction product was sheared at high speed at 10000r / min, a certain amount of 494g of hot water at 80°C was added, sheared at high speed for half an hour, and discharged after cooling.

Embodiment 2

[0019] Put 5g of 2,4-toluene diisocyanate, 100g of AKD, and 15g of polycaprolactone diol into a four-necked flask, heat up to 120°C, feed nitrogen to react for 2 hours; after the reaction, cool down to 85°C, add 24g of ice Acetic acid was stirred for 10 minutes, then 36g of coconut oil fatty acid was added to react for 4h; the reaction product was sheared at a high speed at a speed of 12000r / min, a certain amount of 420g of hot water at 90°C was added, sheared at high speed for half an hour, and discharged after cooling.

Embodiment 3

[0021] Put 5g of 2,4-toluene diisocyanate, 120g of AKD, and 20g of polycaprolactone diol into a four-necked flask, heat up to 150°C, feed nitrogen to react for 2 hours; after the reaction, cool down to 85°C, add 43.5g The glacial acetic acid was stirred for 10 minutes, and then 72.5g of coconut oil fatty acid was added to react for 4h; the reaction product was sheared at a high speed at a speed of 15000r / min, a certain amount of 1000g of hot water at 100°C was added, and the sheared at high speed for half an hour, and the material was discharged after cooling.

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Abstract

The invention belongs to the technical field of papermaking chemistry, and discloses a preparation method of a modified polyurethane / AKD (Alkyl Ketene Dimer) sizing agent, which comprises the following steps: 1) mixing 2, 4-toluene diisocyanate, AKD and polycaprolactone glycol according to a certain proportion, heating to 120-160 DEG C, and introducing nitrogen to react for 2 hours; 2) after the reaction is finished, cooling to 85 DEG C, adding glacial acetic acid, stirring for 10 minutes, adding coconut oil fatty acid, and reacting for 4 hours; and 3) adding a certain amount of hot water into the reaction product under high-speed shearing, performing high-speed shearing for half an hour, cooling and discharging. The obtained sizing agent has the advantages of improved strength, high water resistance, degradability and the like.

Description

technical field [0001] The invention belongs to the technical field of papermaking chemistry, and in particular relates to a preparation method of a modified polyurethane / AKD sizing agent. Background technique [0002] SUMMARY OF THE INVENTION The papermaking wet end adds chemicals. In recent years, there has been a high demand for replacing plastic with paper, and the amount of paper is increasing year by year. Therefore, paper with high water resistance and high barrier properties has become the mainstream in the packaging field. This places higher requirements on papermaking chemicals, especially sizing chemicals. Papermaking chemicals not only need to improve paper properties, such as water resistance, oil resistance, wet strength, oxygen barrier, smoothness, printability, softness, etc., but also require papermaking chemicals to be green and degradable. As the most representative chemical for neutral sizing, AKD mainly provides water resistance, but its oxygen barrier...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/17D21H17/57
CPCD21H21/16D21H17/17D21H17/57D21H17/72
Inventor 高珊珊刘翠耿万磊宋胜男孙一文宋晓明吴逊谦孙秀秀张祥斌汤国锋
Owner QINGDAO UNIV OF SCI & TECH