阅读说明：本技术 一种玻璃纤维纱二次浆及其制备工艺 (Glass fiber yarn secondary pulp and preparation process thereof ) 是由 朱晓静 于 2019-09-29 设计创作，主要内容包括：本发明涉及一种玻璃纤维纱二次浆,包括水86-91wt%、聚乙烯醇3-6wt%、聚乙二醇2.5-5wt%、聚丙烯酸钠0.5-2wt%、羧甲基纤维素0.3-1wt%、水溶性聚氨酯0.7-2wt%、柔软剂0.2-0.8wt%以及抗静电剂0.2-0.5wt%；所述羧甲基纤维素的取代度大于1.5；所述聚丙烯酸钠的分子量为750万-1500万。另外本发明还提供了该玻璃纤维纱二次浆的制备工艺。在相同的烘干条件下,相比常规二次浆,本发明所制得的玻纤纱二次浆所成保护膜龟裂及局部脱落现象均比较少,落浆状况有明显改善,布面品质有显著提高。(The invention relates to a glass fiber yarn secondary pulp, which comprises 86-91wt% of water, 3-6wt% of polyvinyl alcohol, 2.5-5wt% of polyethylene glycol, 0.5-2wt% of sodium polyacrylate, 0.3-1wt% of carboxymethyl cellulose, 0.7-2wt% of water-soluble polyurethane, 0.2-0.8wt% of softening agent and 0.2-0.5wt% of antistatic agent; the degree of substitution of the carboxymethyl cellulose is greater than 1.5; the molecular weight of the sodium polyacrylate is 750-1500 ten thousand. In addition, the invention also provides a preparation process of the secondary sizing of the glass fiber yarn. Under the same drying condition, compared with the conventional secondary size, the protective film formed by the glass fiber yarn secondary size prepared by the invention has less cracking and local shedding phenomena, the size falling condition is obviously improved, and the cloth cover quality is obviously improved.)

1. The secondary sizing agent for the glass fiber yarns is characterized in that: comprises 86-91wt% of water, 3-6wt% of polyvinyl alcohol, 2.5-5wt% of polyethylene glycol, 0.5-2wt% of sodium polyacrylate, 0.3-1wt% of carboxymethyl cellulose, 0.7-2wt% of water-soluble polyurethane, 0.2-0.8wt% of softening agent and 0.2-0.5wt% of antistatic agent; the degree of substitution of the carboxymethyl cellulose is greater than 1.5; the molecular weight of the sodium polyacrylate is 750-1500 ten thousand.

2. The secondary glass yarn size as claimed in claim 1, wherein: the ash content of the polyvinyl alcohol is less than 0.3.

3. The secondary glass yarn size as claimed in claim 2, wherein: the alcoholysis degree of the polyvinyl alcohol is 87-99%, and the molecular weight of the polyvinyl alcohol is 84000-124000.

4. The secondary glass yarn size as claimed in claim 1, wherein: the molecular weight of the polyethylene glycol is 2000-8000.

5. The secondary glass yarn size as claimed in claim 1, wherein: the particle size of the carboxymethyl cellulose is 300 meshes.

6. The secondary glass yarn size as claimed in claim 1, wherein: the water-soluble polyurethane is polyester type.

7. A process for preparing a secondary size of glass yarn according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:

(1) weighing the components in proportion;

(2) 1/5 adding water and polyvinyl alcohol into a container, and stirring for at least 20 minutes at the temperature of below 60 ℃; then heating to above 90 ℃ and stirring for at least 40 minutes to obtain a polyvinyl alcohol solution; cooling to below 75 deg.C;

(3) 4/5 adding water, sodium polyacrylate and carboxymethyl cellulose into another container, stirring for at least 2 hr; heating the system to at least 70 ℃, adding polyethylene glycol, and stirring for at least 20 minutes;

(4) dropwise adding the polyvinyl alcohol solution prepared in the step (2) into the system in the step (3) for at least 1 hour; then stirring for at least 20 minutes;

(5) adding water-soluble polyurethane, and continuously stirring for at least 20 minutes;

(6) adding the softening agent and the antistatic agent and stirring for at least 30 minutes;

(7) and cooling to obtain a finished product.

8. The process for preparing a secondary size for glass fiber yarns as claimed in claim 7, wherein: in the step (2), the stirring speed is 80-150 rpm.

9. The process for preparing a secondary size for glass fiber yarns as claimed in claim 7, wherein: in the step (3), the stirring speed is 200-350rpm, and the stirring temperature is 30-40 ℃.

10. The process for preparing a secondary size for glass fiber yarns as claimed in claim 7, wherein: in the step (4), the stirring speed is 100-240 rpm; the stirring speed in the step (5) and the stirring speed in the step (6) are the same as the stirring speed in the step (4).

Technical Field

The invention relates to the field of glass fiber yarn auxiliaries, in particular to glass fiber yarn secondary pulp and a preparation process thereof.

Background

The secondary sizing agent of the glass fiber cloth mainly comprises polyvinyl alcohol (PVA) and polyethylene glycol (PEG); wherein PVA provides excellent coating property, and PEG mainly plays a role in plasticization and lubrication. However, in actual production, the polyethylene glycol has high requirements for temperature control in the drying process. If the control is improper, the secondary sizing agent protective layer on the glass fiber yarn is easy to crack and partially fall off; after this phenomenon occurs, the glass fiber yarn loses the protection of the size film. In subsequent weaving, the glass fiber yarn needs to bear the mechanical friction force generated by the operation of equipment, and the part of the glass fiber yarn exposed outside the secondary sizing agent can not bear the force, so that the glass fiber yarn has single or a plurality of fiber fracture. After the part of the glass fiber yarn is manufactured to the cloth cover, the cloth cover flaw is formed, and the quality of the cloth cover is influenced.

Disclosure of Invention

The invention overcomes the defects of the prior art and provides the secondary pulp of the glass fiber yarn with less cracking and local shedding phenomena of the protective layer formed during drying and the preparation process thereof.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a glass fiber yarn secondary pulp which characterized in that: comprises 86-91wt% of water, 3-6wt% of polyvinyl alcohol, 2.5-5wt% of polyethylene glycol, 0.5-2wt% of sodium polyacrylate, 0.3-1wt% of carboxymethyl cellulose, 0.7-2wt% of water-soluble polyurethane, 0.2-0.8wt% of softening agent and 0.2-0.5wt% of antistatic agent; the degree of substitution of the carboxymethyl cellulose is greater than 1.5; the molecular weight of the sodium polyacrylate is 750-1500 ten thousand.

Preferably, the ash content of the polyvinyl alcohol is less than 0.3.

More preferably, the alcoholysis degree of the polyvinyl alcohol is 87-99%, and the molecular weight of the polyvinyl alcohol is 84000-124000.

As a preferable mode, the molecular weight of the polyethylene glycol is 2000-8000.

Preferably, the carboxymethyl cellulose has a particle size of 300 meshes.

Preferably, the water-soluble polyurethane is a polyester type.

The invention also provides a preparation process of the glass fiber yarn secondary pulp, which is characterized by comprising the following steps of: the method comprises the following steps:

(1) weighing the components in proportion;

(2) 1/5 adding water and polyvinyl alcohol into a container, and stirring for at least 20 minutes at the temperature of below 60 ℃; then heating to above 90 ℃ and stirring for at least 40 minutes to obtain a polyvinyl alcohol solution; cooling to below 75 deg.C;

(3) 4/5 adding water, sodium polyacrylate and carboxymethyl cellulose into another container, stirring for at least 2 hr; heating the system to at least 70 ℃, adding polyethylene glycol, and stirring for at least 20 minutes;

(4) dropwise adding the polyvinyl alcohol solution prepared in the step (2) into the system in the step (3) for at least 1 hour; then stirring for at least 20 minutes;

(5) adding water-soluble polyurethane, and continuously stirring for at least 20 minutes;

(6) adding the softening agent and the antistatic agent and stirring for at least 30 minutes;

(7) and cooling to obtain a finished product.

As a preferable mode, in the step (2), the stirring speed is 80 to 150 rpm.

As a preferable scheme, in the step (3), the stirring speed is 200-350rpm, and the stirring temperature is 30-40 ℃.

As a preferable scheme, in the step (4), the stirring speed is 100-240 rpm; the stirring speed in the step (5) and the stirring speed in the step (6) are the same as the stirring speed in the step (4).

Compared with the prior art, the invention has the beneficial technical effects that: provides a glass fiber yarn secondary pulp with less cracking and local shedding phenomena of a protective layer formed during drying and a preparation process thereof; under the same drying condition, compared with the conventional secondary size, the protective film formed by the glass fiber yarn secondary size prepared by the invention has less cracking and local shedding phenomena, the size falling condition is obviously improved, and the cloth cover quality is obviously improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 shows a glass fiber cloth obtained by coating secondary pulp and drying in example 1 of the present invention.

FIG. 2 is a glass fiber cloth obtained by coating the secondary pulp and drying according to comparative example 1 of the present invention.

Detailed Description

The invention is further described with reference to specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.