阅读说明：本技术 一种臭氧处理热磨机械浆纤维表面的方法 (A kind of method of ozone treatment thermomechanical pulp fiber surface ) 是由 李军 廖建明 莫立焕 于 2019-07-15 设计创作，主要内容包括：一种臭氧处理热磨机械浆纤维表面的方法。该方法包括以下步骤：1)木片原料经过热处理后,送入盘磨机进行磨制,得到热磨机械浆;(2)使用H<Sub>2</Sub>SO<Sub>4</Sub>将纸浆的pH调节至酸性,在恒温条件下处理一段时间；(3)处理后的纸浆经离心后调节至浓度为30%；(4)将调节好浓度的纸浆移至反应釜中加入一定量的EDTA作为稳定剂,调节反应釜搅拌速度,搅拌后通入臭氧进行反应,反应完成后用蒸馏水洗涤至中性后烘干,对纤维表面木素进行测试,经PFI打浆至一定转速后进行机械性能测试。本发明方法经过臭氧处理后的热磨机械浆纤维表面木素含量降低,机械性能明显改善,同时本发明具有时间短,效率高,废水不含氯,易处理等优点。(A kind of method of ozone treatment thermomechanical pulp fiber surface.Method includes the following steps: 1) chip raw material is sent into disc mill and is ground, obtain thermomechanical pulp after Overheating Treatment;(2) H is used 2 SO 4 The pH of paper pulp is adjusted to acidity, under constant temperature conditions processing a period of time；(3) treated, and paper pulp is adjusted to after being centrifuged that concentration is 30%；(4) paper pulp for regulating concentration is moved in reaction kettle and a certain amount of EDTA is added as stabilizer, adjust reaction kettle mixing speed, ozone is passed through after stirring to be reacted, it is dried after being washed with distilled water to neutrality after the reaction was completed, fiber surface lignin is tested, carries out measuring mechanical property after PFI is beaten to certain revolving speed.The advantages that thermomechanical pulp fiber surface lignin content of the method for the present invention after ozone treatment reduces, and mechanical performance is obviously improved, while the present invention has the time short, high-efficient, and waste water is free of chlorine, easy to handle.)

1. a kind of method of ozone treatment thermomechanical pulp fiber surface, which is characterized in that steps are as follows:

(1) chip raw material is sent into disc mill and is ground, obtain thermomechanical pulp after Overheating Treatment；

(2) H is used₂SO₄The pH of paper pulp is adjusted to acidity, is handled under constant temperature conditions；

(3) treated, and paper pulp adjusts concentration after being centrifuged；

(4) paper pulp for regulating concentration is moved in reaction kettle and EDTA is added as stabilizer, be passed through after ozone at 0-500r Reaction, dried after being washed with distilled water to neutrality after the reaction was completed, fiber surface lignin tested, through PFI be beaten to Measuring mechanical property is carried out after 5000-10000r.

2. the method for ozone treatment thermomechanical pulp fiber surface as described in claim 1, which is characterized in that in step (2), Use H₂SO₄The pH value of paper pulp is adjusted to 2-6；The constant temperature processing time is 10-60min.

3. the method for ozone treatment thermomechanical pulp fiber surface as described in claim 1, which is characterized in that in step (3), Treated, and paper pulp is adjusted to pulp quality percent concentration after being centrifuged as 20-40%.

4. the method for ozone treatment thermomechanical pulp fiber surface as described in claim 1, which is characterized in that in step (4), The ozone treatment step is as follows: EDTA is added after regulating concentration in paper pulp, is put into reaction kettle after rubbing uniformly, adjusts anti- Answering kettle mixing speed is 100r/min, is passed through ozone after stirring and is reacted, and ozone intake is 1-5%.

5. the method for ozone treatment thermomechanical pulp fiber surface as described in claim 1, which is characterized in that in step (4), The dosage of the EDTA is calculated as 0.1-1wt% with paper pulp oven-dry weight, and the dosage of ozone is calculated as 1-5wt% with paper pulp oven-dry weight.

Technical field

The invention belongs to paper pulp fiber performance improvement technical fields, and in particular to a kind of ozone treatment thermomechanical pulp fibres The method on surface.

Background technique

High yield cooking is not had to or with a small amount of chemical treatments plant fiber, then using mechanical energy by plant fiber It is dissociated into paper pulp.Since its yield is high, the low advantage of pollution, is continued to develop in recent decades, such as preheat chip groundwood (TMP), chemi-mechanical pulp (CMP), chemical thermomechanical pulp (CTMP), alkaline hydrogen peroxide chemical mechanical pulp (APMP), P-RC APMP etc..However, reducing rules waste liquid is that temperature is high, pollutional load is big, containing toxic pollutant substance, processing difficulty is greater than general Industrial wastewater.Currently, the black liquor of domestic chemical pulp manufacturing enterprise mostly uses combustion method alkali collection processing technique, technical maturity.And The mass fraction of the initial solid content of reducing rules is smaller, and generally 1.5%~2.0%, it can not directly burn, therefore, reducing rules Sewage treatment be an insoluble problem.Thermomechanical pulp is smaller compared to reducing rules pollutional load, but fiber is relatively endured Firmly, binding force is poor, and paper strength is smaller, so needing to be surface-treated it to improve its performance.

Traditional includes sulfonation, alkali process and hydrogen peroxide treatment etc., these method meetings to the method for fiber surface modification A degree of pollution is caused to environment.Ozone is a kind of strong oxidizer for having been used to paper pulp bleaching, O₃To lignin have compared with Strong selectivity can be improved the whiteness of paper pulp in the lesser situation of loss of strength, and its drift temperature is low, and the time is short, efficiency Height, waste water be free of chlorine, it is easy to handle the advantages that.Reacting between the lignin and ozone on fiber finer cell wall is divided into reaction zone and non-anti- Area is answered, two regions are controlled by the diffusion of ozone, and concentration is different, and mechanism of mass transfer is also different.It is fine under highly concentrated state Close to zero, ozone directly reacts the water film thickness in dimension table face with lignin, and reaction first occurs on primary wall, then passes through S1 S2 layers are diffused to S3 layers to be reacted.Therefore, for mechanical pulp under the conditions of highly concentrated, the lignin on surface can be directly anti-with ozone It answers, to change the structure of fiber surface, improves the performance of mechanical pulp.

Summary of the invention

In order to improve the mechanical performance of thermomechanical pulp, process provides a kind of ozone treatment thermomechanical pulp fibres tables The method in face, this method have the time it is short, it is high-efficient, waste water be free of chlorine, it is easy to handle the advantages that, have in terms of pulp property improvement There is potential application value.

Thermomechanical pulp fibres of the invention are after constant temperature acid handles a period of time, in the condition of EDTA stabilizer Under, and it prepares after a certain amount of ozone reaction.The fiber has lower surface lignin content and preferable mechanicalness Energy.

The present invention is realized by following technical method.

A kind of method of ozone treatment thermomechanical pulp fiber surface, steps are as follows:

(1) chip raw material is sent into disc mill and is ground, obtain thermomechanical pulp after Overheating Treatment；

(2) H is used₂SO₄The pH of paper pulp is adjusted to acidity, is handled under constant temperature conditions；

(3) treated, and paper pulp adjusts concentration after being centrifuged；

(4) paper pulp for regulating concentration is moved in reaction kettle and EDTA is added as stabilizer, be passed through after ozone in 0- It reacts under 500r, is dried after being washed with distilled water to neutrality after the reaction was completed, fiber surface lignin is tested, is beaten through PFI Measuring mechanical property is carried out after slurry to 5000-10000r.

Preferably, in step (2), H is used₂SO₄The pH value of paper pulp is adjusted to 2-6；The constant temperature processing time is 10- 60min。

Preferably, pH described in step (2) is adjusted and constant temperature processing step is as follows: weighing 30g heat with polyethylene sealed bag Mechanical pulp is ground, it is dense to 10% or so with distilled water adjusting slurry, take a certain amount of H₂SO₄PH to 2-6 is adjusted, manually after rubbing uniformly It is put into constant temperature in 30 DEG C of water-baths and handles 10-60min.

Preferably, in step (3), treated, and paper pulp is adjusted to pulp quality percent concentration after being centrifuged as 20- 40%.

Preferably, in step (4), the ozone treatment step is as follows: EDTA is added after regulating concentration in paper pulp, rubbing It is put into reaction kettle after uniformly, adjusting reaction kettle mixing speed is 100r/min, is passed through ozone after stirring and is reacted, and ozone is logical Entering amount is 1-5%.

Preferably, in step (4), the dosage of the EDTA is calculated as 0.1-1wt% with paper pulp oven-dry weight, the dosage of ozone with Paper pulp oven-dry weight is calculated as 1-5wt%.

Thermomechanical pulp fiber surface is handled by approach described above.

Fiber surface lignin content described above reduces, and mechanical performance is obviously improved.

Compared with prior art, beneficial effects of the present invention are as follows:

Thermomechanical pulp handled by the present invention has preferable mechanical strength, suitable for the production of corrugated paper, while this Method have the time it is short, it is high-efficient, waste water be free of chlorine, it is easy to handle the advantages that.

Specific embodiment

The present invention is further explained in the light of specific embodiments.