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Epoxy polyamide resin wet strength agent and preparation method thereof

A technology of epoxy polyamide and wet strength agent, which is applied in the direction of reinforcing agent addition, etc. It can solve the problems of low polymer molecular weight, serious volatilization of raw materials, and affecting the use effect, etc., and achieve high molecular weight distribution, less volatilization loss, and high wet strength. effect of effect

Active Publication Date: 2010-06-23
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using this method to prepare PAE wet strength agent, the reaction time is long, and the raw material volatilization is serious, so that the actual raw material ratio reaction deviates from the theoretical reaction ratio, and it is easy to cause premature termination of the end group in the polycondensation process, so that the molecular weight of the polymer is low, affecting Effect

Method used

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  • Epoxy polyamide resin wet strength agent and preparation method thereof
  • Epoxy polyamide resin wet strength agent and preparation method thereof
  • Epoxy polyamide resin wet strength agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 53.5 grams of dihexamethylenetriamine and 41.5 grams of isophthalic acid to a high-pressure reactor equipped with a stirrer, thermometer, condenser, and nitrogen inlet and outlet, pressurize to 1Mpa with nitrogen, and heat up to 100°C After 3 hours of heat preservation, add 463.8 grams of deionized water with a viscosity of 1250 centipoise (25° C.), which is a bright light yellow transparent viscous odorless liquid.

[0023] When the temperature dropped to 20°C, 23.13 g of epichlorohydrin was added dropwise, and the dropwise addition was completed in 20 minutes. The reaction was continued for 1 hour, and the reaction was stopped. The product was a light yellow viscous liquid.

[0024] The weight solid content is 20.3%, the molecular weight is 172,500, the viscosity is 52 centipoise (25°C), the test method is GB12005.1-89, and the application effect is shown in Attached Table 1 and Attached Table 2.

Embodiment 2

[0026] Add 69 grams of ethylenediamine and 166.13 grams of terephthalic acid to the high-pressure reactor in the same device as in Example 1, pressurize to 2Mpa after stirring evenly, heat up to 150°C, and keep warm for 2.5 hours, then add 1825.5 grams of deionized Water with a viscosity of 1350 centipoise (25°C). It is light yellow transparent viscous odorless liquid.

[0027] When the temperature dropped to 30°C, 138.78 g of epichlorohydrin was added dropwise, and the dropwise addition was completed in 30 minutes. The reaction was continued for 2.5 hours, and the reaction was stopped. The product was a light yellow viscous liquid.

[0028] The weight solid content is 17%, the molecular weight is 174,000, and the viscosity is 105 centipoise (25°C). The test method is the same as above, and the application effect is shown in attached table 1 and attached table 2.

Embodiment 3

[0030] Add 59 grams of guanidine and 90 grams of methyl terephthalate to the high-pressure reactor in the same device as in Example 1, stir evenly and heat up to 130° C. After 2 hours of heat preservation, add 890 grams of deionized water, and the viscosity is 1760 centimeters. Poise (25°C). It is light yellow transparent viscous odorless liquid.

[0031] When the temperature dropped to 35°C, 115 grams of epichlorohydrin was added dropwise, and the dropwise addition was completed in 40 minutes. The reaction was continued for 2 hours, and the reaction was stopped. The product was a light yellow viscous liquid.

[0032] The weight solid content is 22.9%, the molecular weight is 175,600, and the viscosity is 205 centipoise (25°C). The test method is the same as above, and the application effect is shown in Attached Table 1 and Attached Table 2.

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Abstract

The invention discloses an epoxy polyamide resin wet strength agent and a preparation method thereof. The preparation method comprises the following steps: (1) the pressure reaction of aliphatic polyamine and aromatic polyprotic acid is carried out; and (2) the water is added in a condensation compound in step (1), the epichlorohydrin is then added for normal pressure reaction, and the epoxy polyamide resin wet strength agent is obtained. The epoxy polyamide resin wet strength agent prepared by adopting the above method has the viscosity of 50-250 centipoises under 25 DEG C, the solid content of 10-30% by weight percent and the molecular weight range of 170, 000-180, 000. Compared with the conventional wet strength agent, the epoxy polyamide resin wet strength agent has higher wet strength effect as well as obvious dry-strengthening function, and also leads the paper to have better sizing degree and water resistance. The product has higher stability owing to the function of the aromatic group and can be stored for more than half a year under the normal temperature without influencing the using effect.

Description

technical field [0001] The invention relates to a wet strength agent for papermaking and a preparation method thereof, in particular to an epoxy polyamide resin wet strength agent and a preparation method thereof. technical background [0002] With the development of the paper industry, traditional paper wet strength agents such as urea-formaldehyde resin (UF) and melamine-formaldehyde resin (MF) are increasingly unable to meet the needs of users due to the use conditions and the release of harmful substances. [0003] Polyamide polyamine epichlorohydrin resin (PAE) is a more popular wet strength agent in recent years. It not only has good wet strength effect but also has little environmental pollution and no toxic effect, so it is welcomed by the majority of users. Compared with UF resin and MF resin, it is not only a high-efficiency wet strengthening agent cured under medium alkaline conditions, but also improves the wet strength without losing the softness and absorbency ...

Claims

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Application Information

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IPC IPC(8): C08G69/48C08G69/28D21H21/20
Inventor 施晓旦李丽王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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