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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 adding reinforcing agent, can solve the problem of difficult control of product stability, and achieve the effects of increased stability, easy access to raw materials, good sizing degree and water resistance

Inactive Publication Date: 2010-05-12
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the solid content of commercially available wet strength agents is about 12.5%. With the increase of solid content, the stability of the product is more difficult to control

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a 1L flask equipped with a stirrer, a thermometer, a condenser, and a nitrogen gas inlet and outlet, add 53.5 grams of dihexamethylenetriamine and 41.5 grams of isophthalic acid in sequence, heat up to 110°C, and keep the temperature for 5 hours, then add 463.8 grams of deionized water, with a viscosity of 1050 centipoise (25° C.), 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 5 hours, 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 152,500, the viscosity is 52 centipoise (25°C), the test method is GB12005.1-89, and the application effect is shown in the attached table.

Embodiment 2

[0026] Add 69 grams of ethylenediamine and 166.13 grams of terephthalic acid to the 2L four-necked flask in the same device as in Example 1, heat up to 150°C after stirring evenly, and after 3.5 hours of heat preservation, add 1825.5 grams of deionized water. The viscosity is 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.

Embodiment 3

[0030] Add 59 grams of guanidine and 90 grams of methyl terephthalate into the 2L four-necked flask in the same device as in Example 1, heat up to 180°C after stirring evenly, and after 2 hours of heat preservation, add 490 grams of deionized water, the viscosity is 1760 Centipoise (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 3.5 hours, and the reaction was stopped. The product was a light yellow viscous liquid.

[0032] The weight solid content is 35%, 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 the attached table.

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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 of: (1) reacting an aliphatic polyamine with an aromatic polyamine to obtain a condensation product of the aliphatic polyamine and the aromatic polyamine; (2) adding water in the condensation product obtained in the step (1), and adjusting the weight solid content of the condensation product to be 17%-35%; and then adding epoxy chloropropane for reaction to obtain the epoxy polyamide resin wet strength agent. The epoxy polyamide resin wet strength agent has higher wet strength effect in comparison with the traditional wet strength agent, and can evidently increase dry strength effect, and can enable paper to have high degree of sizing and good water resistance; and due to the action of an aromatic group, the epoxy polyamide resin wet strength agent has high stability and can be stored for half a year at normal temperature without influencing the use 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), melamine-formaldehyde resin (MF), etc. have been 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 ab...

Claims

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Application Information

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IPC IPC(8): D21H21/20D21H17/55C08G69/48
Inventor 施晓旦李丽王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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