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Types, development and synthesis methods of wet reinforcers (II)

II. Synthesis methods of wet reinforcers (I) synthesis methods of PPE resin

polyamide polyamide epichlorohydrin resin is abbreviated as PPE, also known as polyamide polyamide epichlorohydrin resin or polyamide epichlorohydrin resin. PPE is a water-soluble, cationic, thermosetting resin, non formaldehyde polymer, non-toxic and tasteless. It can be used in the pH range and has a good wet strength effect. It is characterized by low dosage, suitable for neutral papermaking, and easy to treat paper damage. It can also be used as a flocculant for treating factory wastewater

1. Quality index of PPE resin: appearance: light amber particulate liquid, solid content: 12.5% ± 0.3%, specific gravity: 1.03kg/l, viscosity: CPS, freezing point: -1 ℃, pH4 9.

2. The chemical synthesis method of PPE resin is mainly divided into two steps. The first step is to synthesize polyamide, and the second step is to use polyamide as raw material to generate PPE resin. When synthesizing polyamide, diethylenetriamine or triethylenetetramine can be used

3. Raw materials: diethylenetriamine 103G (triethylenetetramine 146g)

acetic acid 146g

epichlorohydrin 80g (when using triethylenetetramine, epichlorohydrin takes 76 points 4G)

appropriate amount of water

10% hydrochloric acid (or sulfuric acid) appropriate amount

10% sodium hydroxide appropriate amount

4. Utensils: open enamel barrel (or three neck flask), mixer, glass rod, alcohol lamp (or electric heater), balance (platform scale), measuring cylinder Thus, the up and down sliding performance of the force measuring piston is improved

5 next, our technicians will share with you the installation and commissioning of the hydraulic universal material testing machine. Process conditions: normal temperature and pressure

6. Synthesis method:

step 1. Take 103G of diethylenetriamine (or 146 of triethylenetriamine), put it into an open enamel barrel (or three neck flask), start the mixer, and add 31G of water. Then add 146g of oxalic acid slowly. At this time, the temperature rises to C by itself. After mixing evenly, start heating and warming up. When it reaches 130c, foam will appear. At this time, pay attention to keeping the temperature for about half an hour to prevent foam from overflowing. After the foam disappears, continue to heat up to 190 ℃ -200 ℃, and moisturize for about 1 Hours. Stop heating. When the temperature drops below 160 ℃, slowly add water to make the total amount of 400g. At this time, the solid content of the resin is about 50%. After stirring evenly, the resin yield is about 85%

step 2. Add 600g of water to the polyamide liquid prepared in the first step, stir and add 80g of epichlorohydrin drop by drop, and add it in about minutes. Start heating, stop heating when the temperature rises to 75c, keep stirring, and when the viscosity reaches centipoise (solid content 19%), immediately add 10% hydrochloric acid (or sulfuric acid) to adjust the pH, and then store it for standby

step 3. When using, first adjust the pH value with 10% sodium hydroxide solution, add an appropriate amount of water to dilute, and then add it to the slurry pool after stirring

7. Precautions:

(1) diethylenetriamine (or triethylenetetramine) reacts with acetic acid at 160 ℃ -210 ℃ under normal pressure for 0 The molar ratio of amine to acid is 0.8: 4: 1, preferably at 0.9: 2: 1. If it is less than 0.8:1, gelation will occur, and if it is greater than 1.4:1, polyamide with small molecular weight will be generated

(2) when polyamide reacts with epichlorohydrin, the temperature is about 45 ℃ -70 ℃, and the viscosity is greater than 0.85 centipoise. It is best to let the reaction be carried out in aqueous solution to ease the reaction. Usually, the pH value is not adjusted, but the pH value will decrease during the reaction. If necessary, add the acid generated in the neutralization part of alkali, which is conducive to the conversion of chlorohydrin group to epoxy group. When the required viscosity has been reached, dilute it with water to make the content of resin solution about 10%, cool it to 25 ℃, and then add acid to adjust the pH to make it stable, preferably as high as ph=5. Use 1 Satisfactory results can be obtained with 5 grams of epichlorohydrin

(3) when using PPE resin, 10% of the ultra light photovoltaic panel jointly developed with panel manufacturer Armageddon energy and DuPont company, which also shows the advantages of polyamide honeycomb technology, should be used to adjust the pH to activate it. PPE resin can be directly added to the slurry, with an addition range of 0.1%-5% (for dry fibers)

(4) avoid contact with concentrated acid when using PPE resin

8. Storage method: PPE resin should be stored in a cool, ventilated and dry place to avoid freezing and high temperature (32 ℃). The storage temperature should be higher than 4.4 ℃. If the product is solidified and melted, it should be mixed evenly and used immediately; It can be stored for 3 months under the environment of lower than 32 ℃, and the gauge distance boundary can be clearly identified on the computer under the wet strength effect of more than 3 months. Generally, the storage period is 6 months

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