A kind of in-situ reinforced and toughened urea-formaldehyde resin molding compound and its preparation method

A technology for strengthening and toughening urea-formaldehyde resin, applied in the field of in-situ strengthening and toughening urea-formaldehyde resin molding compound and its preparation field, can solve the problems of difficulty in strengthening and toughening modification of urea-formaldehyde resin molding compound, limited strengthening and toughening effect, etc. The effect of curing cross-linking point, increasing strength and improving impact toughness

Active Publication Date: 2020-05-19
CHANGZHOU JOEL PLASTIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since urea-formaldehyde plastic is a thermosetting plastic that is cured, cross-linked and molded in parallel, during the curing and molding process, the resin and the modifier are prone to phase separation, so there is a certain difficulty in blending and modification; in addition, high-content cellulose Filling also makes the strengthening and toughening modification of urea-formaldehyde resin molding compound more difficult, and the strengthening and toughening effect is limited

Method used

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  • A kind of in-situ reinforced and toughened urea-formaldehyde resin molding compound and its preparation method
  • A kind of in-situ reinforced and toughened urea-formaldehyde resin molding compound and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 0.5 part of polyvinyl alcohol with a degree of polymerization of 1000 and a degree of alcoholysis of 88%, dissolve it in distilled water at 95°C for 3 hours, configure it into a 15% aqueous solution, and cool it to room temperature for use; then control the temperature of the reactor to 20 ℃, put 100 parts of formaldehyde, polyvinyl alcohol aqueous solution and 5 parts of polyether polyurethane in the reaction kettle, stir and react for 20 minutes, then add 50 parts of urea, continue stirring and reacting for 30 minutes; finally add 1.5 parts of stearic acid / stearic acid Mixture of amide / polypropylene glycol, 30 parts of corn stalk powder, 0.2 parts of curing agent ammonium chloride and diammonium hydrogen phosphate, after the system is fully mixed, close the reactor, turn on the vacuum, and heat up the reactor to 95°C; knead After drying for 250 minutes, remove the vacuum, cool and pulverize to obtain a reinforced and toughened urea-formaldehyde resin molding compo...

Embodiment 2

[0026] Take 8 parts of polyvinyl alcohol with a degree of polymerization of 2400 and a degree of alcoholysis of 88%, dissolve it in distilled water at 95°C for 3 hours, configure it into a 5% aqueous solution, and cool it to room temperature for use; then control the temperature of the reactor to 80 ℃, put 100 parts of formaldehyde, polyvinyl alcohol aqueous solution and 10 parts of amino-terminated polyether in the reactor, stir for 50 minutes, add 40 parts of urea, continue stirring for 60 minutes; finally add 2 parts of zinc stearate / stearic acid Amide / calcium stearate mixture, 10 parts of lignocellulose, 0.5 parts of curing agent p-toluenesulfonic acid, after the system is fully mixed, close the reaction kettle, turn on the vacuum, and heat the reaction kettle to 60°C; knead and dry for 300 minutes Finally, remove the vacuum, cool and pulverize to obtain a reinforced and toughened urea-formaldehyde resin molding compound.

[0027] Compared with the original urea-formaldehy...

Embodiment 3

[0029] Take 10 parts of polyvinyl alcohol with a degree of polymerization of 2000 and a degree of alcoholysis of 99%, dissolve it in distilled water at 95°C for 3 hours, configure it into a 5% aqueous solution, and cool it to room temperature for use; then control the temperature of the reactor to 50 ℃, put 100 parts of formaldehyde, polyvinyl alcohol aqueous solution and 20 parts of amino-terminated liquid nitrile rubber in the reaction kettle, add 60 parts of urea after stirring for 90 minutes, continue stirring and reacting for 60 minutes; finally add 2.5 parts of zinc stearate / polyethylene A mixture of propylene glycol, 40 parts of lignocellulose, and 0.1 part of curing agent ammonium sulfamate. After the system is fully mixed, close the reactor, turn on the vacuum, and the temperature of the reactor is raised to 70°C; after kneading and drying for 60 minutes, remove the vacuum, cool, Grinding to obtain reinforced and toughened urea-formaldehyde resin molding compound.

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Abstract

The invention discloses an in-situ reinforcing and toughening urea resin moulding compound and a preparing method thereof. The preparing method is characterized by comprising the steps that 0.01-10 parts of polyvinyl alcohol is taken, dissolved into distilled water for 3 h at the temperature of 95 DEG C, prepared into a 5-20% water solution and cooled to the room temperature for use; the temperature of a reaction kettle is controlled to be 20 DEG C-80 DEG C, methanal, a polyvinyl alcohol water solution and 0.1-20 parts of toughening agent are placed into the reaction kettle and fully stirred to react for 10-100 min, then 41-62 parts of urea are added, the mixture is stirred to react for 10-120 min, then 0.3-2.5 parts of lubricating agent, 5-50 parts of crop fiber powder or methyl cellulose, and 0.1-2 parts of curing agent are added, after the mixture is fully mixed uniformly, the reaction kettle is closed, vacuum is started, the mixture enters a kneading and vacuum drying stage, the temperature of the reaction kettle rises to 60 DEG C-95 DEG C, the mixture is kneaded and dried for 60-300 min, and then vacuumizing, cooling and smashing are carried out, so that the reinforcing and toughening urea resin moulding compound is prepared.

Description

[0001] 1. Technical field [0002] The invention relates to an in-situ reinforced and toughened urea-formaldehyde resin molding compound and a preparation method thereof, belonging to the field of polymer material synthesis and processing. [0003] 2. Background technology [0004] Urea-formaldehyde resin molding powder, commonly known as electric jade powder, is a thermosetting material made of a resin obtained by polycondensation of urea and formaldehyde, adding fillers such as lignocellulose, and additives such as curing agents and plasticizers. Urea-formaldehyde resin is a traditional downstream product of coal chemical industry. It is cheap, and the product has the advantages of high hardness, flame retardant, mildew resistance, fast curing speed and good coloring. It is widely used in the production of electrical components, tableware, toys, cosmetics, and containers. Covers, photographic equipment parts and buttons, etc. However, urea-formaldehyde resin molding compound...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/36C08L61/24C08L97/02C08L75/06C08L75/08C08L71/00C08L15/00C08K5/09C08K5/098C08K5/20
Inventor 肖和平赵晓文龚忠顺叶林曹大伟
Owner CHANGZHOU JOEL PLASTIC
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