阅读说明：本技术 一种回收pet型不饱和聚酯树脂制备锚固剂的方法 (Method for preparing anchoring agent by recycling PET type unsaturated polyester resin ) 是由 李强 于 2021-01-12 设计创作，主要内容包括：本发明公开了一种回收PET型不饱和聚酯树脂制备锚固剂的方法,属于锚固剂制备领域,由回收PET废料、不饱和二元酸、饱和二元酸、二元醇为主要原料经过醇解、酯交换、酯化等过程合成聚酯,再经过聚酯稀释得到回收PET锚固剂专用不饱和聚酯树脂。由该PET型锚固剂专用树脂生产出的锚固剂性能优良,价格低廉。同时消化了生产涤纶布或PET造粒过程中产生的PET废料,变废为宝。(The invention discloses a method for preparing an anchoring agent by recycling PET type unsaturated polyester resin, belonging to the field of preparation of anchoring agents. The anchoring agent produced by the special resin for the PET type anchoring agent has excellent performance and low price. Meanwhile, PET waste materials generated in the polyester fabric production or PET granulation process are digested, and waste materials are changed into valuable materials.)

1. A method for preparing an anchoring agent by recycling PET type unsaturated polyester resin is characterized by comprising the following steps:

s1, weighing PET, dihydric alcohol and a catalyst according to the molar parts of the raw materials, sequentially putting the weighed raw materials into a polyester reaction kettle, heating to raise the temperature, stirring slightly if the temperature is raised to 180 ℃, starting stirring to raise the temperature if no abnormality exists, starting heat preservation after the temperature of the materials is raised to 200 ℃, controlling the column temperature to be not more than 100 ℃, and preserving the heat for 3-6 hours at the temperature of 200-225 ℃ so as to ensure that the PET is completely alcoholyzed;

s2, controlling the temperature of the polyester reaction kettle to be 180 ℃ plus 160 ℃, putting unsaturated dibasic acid and saturated dibasic acid which are measured in parts by mole into the polyester reaction kettle, slowly heating and controlling the material temperature to be 160 ℃ plus 150 ℃ for reacting with water, controlling the heating speed during the early stage water outlet period, controlling the heating rate to be not more than 15 ℃/hr and controlling the column temperature to be 103 ℃ plus 100 ℃ after the water is stable;

s3, when the temperature of the material in the polyester reaction kettle is increased to above 215-225 ℃, the temperature of the column is reduced to below 90 ℃, sampling is carried out, the acid value is measured, when the acid value is lower than 55mgKOH/g, vacuum pumping is carried out for 15-30min, and the end acid value is controlled to be less than or equal to 40 mgKOH/g;

s4, controlling the temperature of the polyester reaction kettle to be reduced to 190 ℃ for one time, adding a polymerization inhibitor, continuously reducing the temperature to 135 ℃ for one time, adding metered styrene, stirring until the temperature is less than 55 ℃, discharging and packaging the product.

2. The method for preparing anchoring agent by recycling PET type unsaturated polyester resin according to claim 1, wherein: the S1 neutralization and the S2 neutralization are carried out according to the molar ratio: PET1.00-1.50, unsaturated dibasic acid 2.00-2.60, saturated dibasic acid 0.2-0.8, dihydric alcohol 2.30-3.00, and styrene 2.80-3.40.

3. The method for preparing anchoring agent by recycling PET type unsaturated polyester resin according to claim 1, wherein: the catalyst in the S1 is acetate or organic tin catalyst, and the addition amount of the catalyst is 0.3-0.6 per mill of the total weight of the PET and the dihydric alcohol.

4. The method for preparing anchoring agent by recycling PET type unsaturated polyester resin according to claim 1, wherein: the polymerization inhibitor in the S4 is one or more of methyl hydroquinone, benzoquinone, p-tert-butyl catechol and phenothiazine, and the addition amount of the polymerization inhibitor is 0.05-0.20 per mill of the total weight of the unsaturated polyester resin.

5. The method for preparing anchoring agent by recycling PET type unsaturated polyester resin according to claim 1, wherein: the PET in the S1 is PET waste and PET bottle flakes generated in the polyester fabric production or PET granulation process.

6. The method for preparing anchoring agent by recycling PET type unsaturated polyester resin according to claim 1, wherein: the unsaturated dibasic acid in the S2 is one or more of maleic anhydride and fumaric acid.

7. The method for preparing anchoring agent by recycling PET type unsaturated polyester resin according to claim 1, wherein: the saturated dibasic acid in the S2 is one or more of phthalic anhydride and isophthalic acid.

8. The method for preparing anchoring agent by recycling PET type unsaturated polyester resin according to claim 1, wherein: the dihydric alcohol in the S1 is one or more of ethylene glycol, propylene glycol, diethylene glycol and dipropylene glycol.

Technical Field

The invention relates to the field of preparation of anchoring agents, in particular to a method for preparing an anchoring agent by recycling PET type unsaturated polyester resin.

Background

The application of the resin anchoring agent in coal mines in China has been in the past 60 years, and along with the high importance of the nation on the safety of the coal mines and the continuous increase of the dosage of the anchoring agent, the resin anchoring agent has higher requirements on the performance of the anchoring agent. The anchor agent produced by the general unsaturated polyester resin mainly has the problems of high cost, easy layering phenomenon of the anchor agent and the like. In the prior domestic production of polyester fabric or PET granulation process, waste materials are generated due to process limitation. The PET waste material generated in the polyester fabric production or PET granulation process is adopted to synthesize the unsaturated polyester resin special for the PET type anchoring agent, thereby digesting the PET waste material which needs to be incinerated originally and changing waste into valuable.

Disclosure of Invention

The invention provides a method for preparing an anchoring agent by recycling PET type unsaturated polyester resin to solve the problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for preparing an anchoring agent by recycling PET type unsaturated polyester resin comprises the following steps:

s1, weighing PET, dihydric alcohol and a catalyst according to the molar parts of the raw materials, sequentially putting the weighed raw materials into a polyester reaction kettle, heating to raise the temperature, stirring slightly if the temperature is raised to 180 ℃, starting stirring to raise the temperature if no abnormality exists, starting heat preservation after the temperature of the materials is raised to 200 ℃, controlling the column temperature to be not more than 100 ℃, and preserving the heat for 3-6 hours at the temperature of 200-225 ℃ so as to ensure that the PET is completely alcoholyzed;

s2, controlling the temperature of the polyester reaction kettle to be 180 ℃ plus 160 ℃, putting unsaturated dibasic acid and saturated dibasic acid which are measured in parts by mole into the polyester reaction kettle, slowly heating and controlling the material temperature to be 160 ℃ plus 150 ℃ for reacting with water, controlling the heating speed during the early stage water outlet period, controlling the heating rate to be not more than 15 ℃/hr and controlling the column temperature to be 103 ℃ plus 100 ℃ after the water is stable;

s3, when the temperature of the material in the polyester reaction kettle is increased to above 215-225 ℃, the temperature of the column is reduced to below 90 ℃, sampling is carried out, the acid value is measured, when the acid value is lower than 55mgKOH/g, vacuum pumping is carried out for 15-30min, and the end acid value is controlled to be less than or equal to 40 mgKOH/g;

s4, controlling the temperature of the polyester reaction kettle to be reduced to 190 ℃ for one time, adding a polymerization inhibitor, continuously reducing the temperature to 135 ℃ for one time, adding metered styrene, stirring until the temperature is less than 55 ℃, discharging and packaging the product.

Preferably, the molar ratio of the neutralization in S1 and S2 is: PET1.00-1.50, unsaturated dibasic acid 2.00-2.60, saturated dibasic acid 0.2-0.8, dihydric alcohol 2.30-3.00, and styrene 2.80-3.40.

Preferably, the catalyst in the S1 is acetate or organic tin catalyst, and the addition amount of the catalyst is 0.3-0.6 per mill of the total weight of the PET and the dihydric alcohol.

Preferably, the polymerization inhibitor in S4 is one or more of methyl hydroquinone, benzoquinone, p-tert-butyl catechol, and phenothiazine, and the addition amount of the polymerization inhibitor is 0.05-0.20% of the total weight of the unsaturated polyester resin.

Preferably, the PET in S1 is polyester fabric or PET waste, PET bottle flakes generated during the PET granulation process.

Preferably, the unsaturated dibasic acid in S2 is one or more of maleic anhydride and fumaric acid.

Preferably, the saturated dibasic acid in S2 is one or more of phthalic anhydride and isophthalic acid.

Preferably, the diol in S1 is one or more of ethylene glycol, propylene glycol, diethylene glycol and dipropylene glycol.

Compared with the prior art, the invention provides a method for preparing an anchoring agent by recycling PET type unsaturated polyester resin, which has the following beneficial effects:

1. the invention has the beneficial effects that: the method adopts the PET waste materials generated in the polyester fabric production or PET granulation process to synthesize the unsaturated polyester resin special for the PET type anchoring agent through the processes of alcoholysis, ester exchange, esterification and the like, thereby digesting the PET waste materials which need to be incinerated and changing waste into valuable;

2. the invention has the beneficial effects that: the invention adopts the recycled PET as the raw material, has low price, shortens the total reaction time by 6-8 hours compared with the general resin, saves time and reduces consumption, and is low-carbon and environment-friendly;

3. the invention has the beneficial effects that: according to the invention, the unsaturated polyester resin special for the recycled PET type anchoring agent is applied to the anchoring agent production process, and the produced anchoring agent is low in price and has excellent performances of high strength, no delamination, good thermal stability and the like.

Drawings

FIG. 1 is a comparison graph of properties of an anchoring agent daub prepared from a general-purpose resin on the market and a PET type anchoring agent special-purpose resin prepared by the invention, wherein the general-purpose resin is a specific example of a method for preparing the anchoring agent by recycling the PET type unsaturated polyester resin provided by the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example 1:

a method for preparing an anchoring agent by recycling PET type unsaturated polyester resin comprises the following steps:

and S1, putting PET, ethylene glycol, diethylene glycol and acetate catalysts into a polyester reaction kettle according to the molar parts of the raw materials, heating, stirring when the temperature is increased to 180 ℃, and starting stirring and heating if no abnormity occurs. When the temperature of the material is raised to 200 ℃, the heat preservation is started, the column temperature is controlled not to exceed 100 ℃, and the heat preservation is carried out for 4 hours at 200 ℃ so as to ensure that the PET is completely alcoholyzed;

s2, cooling to 160 ℃, putting the maleic anhydride and the phthalic anhydride which are measured in parts by mole into a polyester reaction kettle, slowly heating and controlling the material temperature to react at 150 ℃ to obtain water, controlling the heating speed during the early stage of water outlet, controlling the heating rate to be not more than 15 ℃/hr and controlling the column temperature to be 100 ℃ after the water is stable;

s3, heating the material to above 215 ℃, cooling the column to below 90 ℃, sampling and measuring the acid value, vacuumizing for 15min when the acid value is lower than 55mgKOH/g, and controlling the end acid value to be less than or equal to 40 mgKOH/g;

s4, cooling to 190 ℃, adding methyl hydroquinone, continuously cooling to 125 ℃, adding metered styrene, stirring until the temperature is less than 55 ℃, discharging and packaging the product.

Further, preferably, the molar parts of the raw materials are as follows: 1.00 of PET, 2.00 of unsaturated dibasic acid, 0.2 of saturated dibasic acid, 2.30 of dihydric alcohol and 2.80 of styrene.

Further, preferably, the raw materials also comprise a catalyst, and the addition amount of the catalyst is 0.3 per mill of the total weight of the PET and the dihydric alcohol.

Further, preferably, the raw materials also comprise a polymerization inhibitor, and the addition amount of the polymerization inhibitor is 0.05 per mill of the total weight of the unsaturated polyester resin.

Example 2:

a method for preparing an anchoring agent by recycling PET type unsaturated polyester resin comprises the following steps:

and S1, putting PET, propylene glycol, diethylene glycol and an organic tin catalyst into a polyester reaction kettle according to the molar parts of the raw materials, heating, stirring when the temperature is increased to 180 ℃, and starting stirring and heating if no abnormity occurs. When the temperature of the material is raised to 200 ℃, the heat preservation is started, the column temperature is controlled not to exceed 100 ℃, and the heat preservation is carried out for 6 hours at the temperature of 200-225 ℃ so as to ensure that the PET is completely alcoholyzed;

s2, cooling to 180 ℃, putting fumaric acid and phthalic anhydride which are measured according to molar parts into a polyester reaction kettle, slowly heating and controlling the material temperature to react at 155 ℃ to obtain water, controlling the heating speed during the early stage water outlet period, controlling the heating rate to be not more than 15 ℃/hr and controlling the column temperature to be 102 ℃ after the water is stable;

s3, heating the material to above 220 ℃, cooling the column to below 90 ℃, sampling and measuring the acid value, vacuumizing for 15-30min when the acid value is lower than 55mgKOH/g, and controlling the end acid value to be less than or equal to 40 mgKOH/g;

s4, cooling to 180 ℃, adding p-tert-butyl catechol, continuously cooling to 130 ℃, adding metered styrene, stirring until the temperature is less than 55 ℃, discharging and packaging the product.

Further, preferably, the molar parts of the raw materials are as follows: 1.25 parts of PET, 2.30 parts of unsaturated dibasic acid, 0.6 part of saturated dibasic acid, 2.60 parts of dihydric alcohol and 3.10 parts of styrene.

Further, preferably, the raw materials also comprise a catalyst, and the addition amount of the catalyst is 0.4 per mill of the total weight of the PET and the dihydric alcohol.

Further, preferably, the raw materials also comprise a polymerization inhibitor, and the addition amount of the polymerization inhibitor is 0.1 per mill of the total weight of the unsaturated polyester resin.

Further, preferably, the polymerization inhibitor is one or more of methyl hydroquinone, benzoquinone, p-tert-butyl catechol and phenothiazine.

Example 3:

a method for preparing an anchoring agent by recycling PET type unsaturated polyester resin comprises the following steps:

s1, putting PET, dihydric alcohol and an organic tin catalyst into a polyester reaction kettle according to the molar parts of the raw materials, heating, stirring while stirring when the temperature is raised to 180 ℃, starting stirring and raising the temperature when the temperature is raised to 200 ℃, starting heat preservation when the temperature of the materials is raised to 200 ℃, controlling the column temperature to be not more than 100 ℃, and preserving the heat at 225 ℃ for 3-6 hours to ensure that the PET is completely alcoholyzed;

s2, cooling to 180 ℃, putting the unsaturated dibasic acid and the saturated dibasic acid which are measured according to the molar parts into a polyester reaction kettle, slowly heating and controlling the material temperature to react at 160 ℃ to obtain water, controlling the heating speed during the early stage of water outlet, controlling the heating rate to be not more than 15 ℃/hr and controlling the column temperature to be 103 ℃ after the water is stable;

s3, heating the material to above 225 ℃, cooling the column to below 90 ℃, sampling and measuring the acid value, vacuumizing for 30min when the acid value is lower than 55mgKOH/g, and controlling the end acid value to be less than or equal to 40 mgKOH/g;

s4, cooling to 190 ℃, adding benzoquinone, continuously cooling to 135 ℃, adding metered styrene, stirring until the temperature is less than 55 ℃, discharging and packaging the product.

Further, preferably, the molar parts of the raw materials are as follows: 1.50 parts of PET, 2.60 parts of unsaturated dibasic acid, 0.8 part of saturated dibasic acid, 3.00 parts of dihydric alcohol and 3.40 parts of styrene.

Further, preferably, the raw materials also comprise a catalyst, and the addition amount of the catalyst is 0.6 per mill of the total weight of the PET and the dihydric alcohol.

Further, preferably, the raw materials also comprise a polymerization inhibitor, and the addition amount of the polymerization inhibitor is 0.20 per mill of the total weight of the unsaturated polyester resin.

The comparison of the properties of the anchoring agent daub prepared from the general-purpose resin on the market and the PET-type anchoring agent special-purpose resin prepared by the invention is shown in the following figure 1 (the addition amount of the accelerator is 1% of the weight of the resin).

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.