CN109385929B

CN109385929B - Anti-static coating liquid

Info

Publication number: CN109385929B
Application number: CN201811391137.9A
Authority: CN
Inventors: 杨喜龙; 王淑莉
Original assignee: Tangshan Defang Chemical Co ltd
Current assignee: Tangshan Defang Chemical Co ltd
Priority date: 2018-11-21
Filing date: 2018-11-21
Publication date: 2020-12-22
Anticipated expiration: 2038-11-21
Also published as: CN109385929A

Abstract

The invention relates to the technical field of static prevention, in particular to an anti-static coating liquid, which comprises the following raw materials in parts by weight: 10-20% of neutral silica sol, 20-30% of anionic surfactant, 0.1-1% of amphoteric surfactant and the balance of water. The product is novel and unique, the coating liquid is applied to the back of the RC photographic paper, the antistatic capacity is strong, the waterproof property and the adhesive force of the antistatic coating are strong, and the antistatic coating is not easy to fall off, so that the problems of product damage caused by static electricity in the production, the transportation and the use of the RC photographic paper, falling off of the antistatic coating caused by mechanical force and the like are solved.

Description

Anti-static coating liquid

Technical Field

The invention relates to an antistatic coating liquid, in particular to an antistatic coating liquid applied to RC photographic paper.

Background

The base material used by the photosensitive material is extremely hydrophobic, so that electrostatic charges are very easily absorbed, and high-voltage static electricity is generated due to friction in the processes of coating, drying, cutting, transporting and later use, so that electrostatic spots are formed. Typically, positive charges appear as electrostatic spots and negative charges appear as dendrites. Along with the improvement of the light sensitivity of the photographic emulsion, the improvement of the coating speed and the reduction of the environmental humidity, the probability of electrostatic spots is increased, and a large amount of products are scrapped when the probability is serious, so that great loss is caused. The RC highlight photographic paper is photographic paper which is made by coating film-coated photographic paper base paper on two sides through multiple layers, and the RC highlight photographic paper has the problems of large equipment investment, more coating times, more complex process and low yield, so that the problem of avoiding the loss of finished products caused by electrostatic action is needed to be solved at present.

The antistatic technology commonly used at present adopts an antistatic agent, and a small amount of the antistatic agent is generally added into the plastic or directly coated on the surface of a plastic product, so that the generation of static electricity can be effectively inhibited. Antistatic agents can be classified into two categories, surfactant type antistatic agents and polymer type antistatic agents, according to their molecular structures. The antistatic agents commonly used at present mainly include cationic antistatic agents, anionic antistatic agents, nonionic antistatic agents, amphoteric antistatic agents and high molecular antistatic agents. And the surface resistivity of the product is 10⁶-10¹²The antistatic ability of ohm/sq is the greatest, and how to reduce the surface resistivity as much as possible in this range is a problem in the industry at present.

In patent CN104194046B, a nano mesoporous material/surfactant type composite electric-resistant agent, and a preparation method and application thereof are disclosed. The invention adopts nano mesoporous material as carrier, and uses traditional surface activityThe antistatic agent is prepared by encapsulating molecules of an antistatic agent in a nano mesoporous material, has the excellent antistatic performance of the traditional surfactant type antistatic agent, has stronger slow release effect, can effectively improve the timeliness and durability of the antistatic effect, and has the surface resistivity of 10⁹-10¹⁰ohm/sq。

Patent CN103741465B discloses a preparation method of an antistatic agent, which comprises a Gemini surfactant, high molecular weight chain alkyl alcohol phosphate and polyester, the antistatic agent has good water solubility, small air bubble property, good heat resistance, acid and alkali resistance and antistatic effect, and the surface resistivity of the product can be 10⁸-10¹⁰Ω/m。

However, the adhesion performance of the antistatic agent on the surface of the product greatly affects the antistatic effect and the stability of the antistatic ability, so how to improve the antistatic performance of the product and maintain the stable antistatic ability is a technical problem.

Disclosure of Invention

The invention aims to provide an antistatic coating liquid which has strong antistatic capacity, has strong adhesive force when being coated on the surface of RC photographic paper, is not easy to fall off, and has the surface resistivity of 10⁶-10⁷Ω/m。

The antistatic coating liquid comprises the following raw materials in parts by weight: 10-20% of neutral silica sol, 20-30% of anionic surfactant, 0.1-1% of amphoteric surfactant and the balance of water.

Preferably, the neutral silica sol is a neutral silica sol with a model number of N2510 of Shandong Baite New Material Co., Ltd, wherein SiO is₂The concentration is 24-26 percent, and SiO is₂Has an average particle diameter of 10 to 15 nm.

Preferably, the anionic surfactant is sodium polystyrene sulfonate or potassium polystyrene sulfonate.

Preferably, the polystyrene sodium sulfonate or polystyrene potassium sulfonate has an average molecular weight of 6-8 ten thousand and a sulfonation degree of more than 70%.

Preferably, the amphoteric surfactant is betaine.

The anti-static coating liquid is applied to the RC photographic paper, a layer of anti-static coating liquid is uniformly coated on the back surface of the RC photographic paper, and the coating amount of the anti-static coating liquid is 0.25-0.3g/m²。

Compared with the prior art, the invention has the following beneficial effects: the product of the invention is novel and unique, the coating liquid can be uniformly spread in RC photographic paper by utilizing the surfactant, and the coating has stronger adhesive force by utilizing the silica sol; the product has strong antistatic ability and stable antistatic property when being applied to RC photographic paper, and the coating is not easy to fall off.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

An antistatic coating liquid comprises the following raw materials in parts by weight:

the method adopts 18 percent of neutral silica sol with the model number of N2510 of Shandong Baite new material Co., Ltd, 24 percent of sodium polystyrene sulfonate, 0.8 percent of betaine and the balance of water, wherein SiO in the neutral silica sol₂Concentration of 25% and SiO in neutral silica sol₂The average particle size of the polystyrene sodium sulfonate is 12nm, the average molecular weight of the polystyrene sodium sulfonate is 6 ten thousand, and the sulfonation degree is 75%. The raw materials are mixed to prepare the antistatic coating liquid. The antistatic coating liquid is uniformly coated on the back of the RC photographic paper, and the coating amount is 0.3g/m². The surface resistivity of the coated RC photographic paper was measured to be 1.01X 10⁶Ω/m。

Example 2

the method adopts 20 percent of neutral silica sol with the model number of N2510 of Shandong Baite new material Co., Ltd, 20 percent of sodium polystyrene sulfonate, 1 percent of betaine and the balance of water, wherein SiO in the neutral silica sol₂Concentration of 25% and SiO in neutral silica sol₂The average particle size of the polystyrene sodium sulfonate is 10nm, the average molecular weight of the polystyrene sodium sulfonate is 8 ten thousand, and the sulfonation degree is 72%. The raw materials are mixed to prepare the antistatic coating liquid. The antistatic coating liquid is uniformly coated on the back of the RC photographic paper, and the coating amount is 0.25g/m². The surface resistivity of the coated RC photographic paper was measured to be 2.11X 10⁷Ω/m。

Example 3

the method adopts 10 percent of neutral silica sol with the model number of N2510 of Shandong Baite new material Co., Ltd, 30 percent of sodium polystyrene sulfonate, 0.1 percent of betaine and the balance of water, wherein SiO in the neutral silica sol₂Concentration of 25% and SiO in neutral silica sol₂The average particle size of the polystyrene sodium sulfonate is 15nm, the average molecular weight of the polystyrene sodium sulfonate is 7 ten thousand, and the sulfonation degree is 80%. The raw materials are mixed to prepare the antistatic coating liquid. The antistatic coating liquid is uniformly coated on the back of the RC photographic paper, and the coating amount is 0.28g/m². The surface resistivity of the coated RC photographic paper was measured to be 0.97X 10⁷Ω/m。

Comparative example 1

The nano mesoporous material/surfactant type composite electric-resistant agent is obtained according to the preparation method of patent CN104194046B example 1, the composite electric-resistant agent is uniformly coated on the back surface of RC photographic paper, the coating amount is the same as that in example 1, and the surface resistivity of the coated RC photographic paper is detected to be 5.69 multiplied by 10⁹Ω/m。

The surface resistivity values of the coated RC papers of examples 1 to 3 and comparative example 1 were measured after ultrasonic washing with water of 60KHZ, respectively, as shown in table 1.

TABLE 1

As can be seen from table 1, after the electrostatic coating liquid of the present invention is used to coat the RC photographic paper, the antistatic ability of the RC photographic paper is much greater than that of comparative example 1, and the RC photographic paper still has strong antistatic ability after being washed with ultrasonic water for 300min, while the antistatic ability of comparative document 1 is significantly reduced.

Claims

1. The antistatic coating liquid is characterized by comprising the following raw materials in parts by weight:

10 to 20 percent of neutral silica sol,

20 to 30 percent of anionic surfactant,

0.1 to 1 percent of amphoteric surfactant,

the balance of water;

SiO in the neutral silica sol₂The concentration of (A) is 24-26%, and the average particle size is 10-15 nm;

the anionic surfactant is sodium polystyrene sulfonate or potassium polystyrene sulfonate, the average molecular weight is 6-8 ten thousand, and the sulfonation degree is more than 70%;

the amphoteric surfactant is betaine.

2. Use of the antistatic coating liquid according to claim 1 in RC photographic paper.