CN114276672A

CN114276672A - Matte master batch of thermoplastic elastic polyurethane film

Info

Publication number: CN114276672A
Application number: CN202210034667.8A
Authority: CN
Inventors: 余正安
Original assignee: Huizhou Zhenyou New Material Technology Co ltd
Current assignee: Huizhou Zhenyou New Material Technology Co ltd
Priority date: 2022-01-13
Filing date: 2022-01-13
Publication date: 2022-04-05

Abstract

The invention discloses a matte master batch for producing a thermoplastic elastic polyurethane film, belonging to the technical field of TPU film preparation and used for adjusting the matte effect of the film, wherein the TPU matte master batch comprises the following raw materials: TPU, mica powder, a titanate coupling agent and a lubricating dispersant, wherein the mass parts of the raw materials are as follows: 45-55% of TPU, 40-50% of mica powder, 1-2% of titanate coupling agent and 3-4% of lubricating dispersant; the functional master batch provided by the invention can enable the thermoplastic elastic polyurethane film to have a good matte effect, and the thermoplastic elastic polyurethane film is not whitish when stretched and has certain transparency.

Description

Matte master batch of thermoplastic elastic polyurethane film

Technical Field

The invention belongs to the technical field of film preparation, and particularly relates to a matte master batch of a thermoplastic elastic polyurethane film.

Background

The thermoplastic polyurethane elastomer is also called thermoplastic polyurethane rubber, TPU for short, and is An (AB) n type block linear polymer, wherein A is polyester or polyether with high molecular weight (1000-6000), B is diol containing 2-12 straight chain carbon atoms, and the chemical structure between AB chain segments is diisocyanate. The thermoplastic polyurethane rubber is crosslinked by intermolecular hydrogen bonds or slightly crosslinked between macromolecular chains, and the two crosslinking structures have reversibility along with the increase or decrease of temperature. The intermolecular force is weakened in a molten state or a solution state, and the intermolecular force is strongly connected together after cooling or solvent volatilization, so that the performance of the original solid is recovered. Typical TPU's such as spandex and the like

The TPU raw material with bright surface can be made into products with bright surface or matte surface by an extruder, but the matte surface agent is inoculated because some TPU raw materials with bright surface cannot achieve the matte surface effect by adjusting the extruder.

The current fogging face agent for TPU products is mainly silicon dioxide, calcium carbonate, talcum powder and silicate inorganic substances. In addition, organic matters which are not compatible with the TPU, such as styrene-ethylene-butadiene-styrene block copolymer, acrylate copolymer and the like are added, and the matte effect is achieved by utilizing the difference of melting points and crystallinity between the organic plastic raw material and the TPU raw material. One or more of the materials can produce certain matte effect through composite preparation, and one or more of the materials is added with a coupling agent or coated with a modified material, so that the compatibility of the modified material and the TPU is improved, the haze is improved, but most of the materials affect the transparency of TPU film products and exist in the film in a dispersed state, so that when the TPU film is stretched under stress, insoluble substances dispersed in the TPU can be separated from the TPU raw material coating state under the action of force to present an obvious whitening condition.

Disclosure of Invention

The invention aims to provide matte matt master batch of a thermoplastic elastic polyurethane film, which is added into a thermoplastic elastic polyurethane raw material to produce the thermoplastic elastic polyurethane film with high matte effect, no whitening after stretching and good transparency.

In order to achieve the purpose, the invention provides the following technical scheme: a thermoplastic elastic polyurethane functional master batch: the TPU matte master batch comprises the following raw materials: TPU, mica powder, a titanate coupling agent and a lubricating dispersant EBS, wherein the mass parts of the raw materials are as follows: 45-55% of TPU, 40-50% of mica powder, 1-2% of titanate coupling agent and 3-4% of lubricating dispersant EBS.

By adopting the scheme, the synthetic mica powder does not contain impurities and has high purity, the microscopic particles are in transparent sheets, the mica sheet particles are mutually connected in a film shape by the melted TPU raw material due to large surface area, when the membrane is stretched by external force, the mica particles can extend along the direction of the elastic stretching force of the TPU and are not easy to separate from and break with the TPU raw material molecules, so that the TPU film added with the mica powder is not easy to whiten during stretching when being stretched by force.

In addition, after the TPU fused mass added with the mica powder is formed into a film, before the TPU fused mass is not completely solidified and formed, the particles in the TPU film are horizontally staggered and arranged in a multilayer way along with the direction of the force under the stress condition, the transmission flux transmittance Tt of the TPU film formed by the method is high, and the parallel staggered and arranged multilayer way also increases the scattering flux Td of light, so that the TPU film with transparency and higher haze can be obtained.

Further, the optimal mixture ratio among the raw materials is 50% of TPU, 45% of mica powder, 2% of titanate coupling agent and 3% of lubricating dispersant EBS.

Further, the TPU adopts peak 3385A numbered TPU.

Further, the preparation method comprises the following steps:

firstly, adding TPU, mica powder, a titanate coupling agent and a lubricating dispersant EBS into an internal mixer according to the mass portion ratio to obtain a sizing material;

secondly, putting the sizing material into a double-screw injection molding machine for granulation to obtain matte matt master batches;

the invention has the beneficial effects that: the functional master batch provided by the invention takes TPU raw materials as base materials, synthetic mica powder is added into the base materials to prepare matte master batches, the obtained matte master batches and the TPU raw materials are mixed and blown to obtain the TP film, and the obtained TP film has good transparency and high matte effect and does not turn white in a stretching state.

Detailed Description

In order to further understand the contents, features and effects of the present invention, the following examples are given below for further explanation.

The matte master batch of the thermoplastic elastic polyurethane film of the embodiment of the invention will be described in detail.

The transparent stretched non-whitish TPU matte master batch comprises the following raw materials: TPU, mica powder, a titanate coupling agent and a lubricating dispersant EBS, wherein the mass parts of the raw materials are as follows: 45-55% of TPU, 40-50% of mica powder, 1-2% of titanate coupling agent and 3-4% of lubricating dispersant EBS.

Specifically, the optimal mixture ratio of the raw materials is 50% of TPU, 45% of mica powder, 2% of titanate coupling agent and 3% of lubricating dispersant EBS.

The TPU adopts the Huafeng 3385A-numbered TPU, the synthesized mica powder is 2500 meshes, and the titanate coupling agent and the lubricating dispersant EBS are common raw materials which can be purchased in the market.

Example 1

55 percent of TPU, 40 percent of mica powder, 1 percent of titanate coupling agent and 4 percent of lubricating dispersant EBS are selected.

The preparation method comprises the following steps:

adding TPU, mica powder, a titanate coupling agent and a lubricating dispersant EBS into an internal mixer according to the mass portion ratio, wherein the roll gap of the internal mixer is 0.5mm, the internal mixing temperature is 150 ℃, and the time is 15 minutes to obtain a rubber material;

secondly, putting the sizing material into a double-screw injection molding machine for granulation to obtain matte master batches;

thirdly, mixing the obtained matte master batch with TPU raw materials with the hardness of 90A/95A according to the mass ratio of 1:10, mixing and blowing the film to obtain the matte finished film.

Example 2

50% of TPU, 45% of mica powder, 2% of titanate coupling agent and 3% of lubricating dispersant EBS are selected.

The preparation method comprises the following steps:

adding TPU, mica powder, a titanate coupling agent and a lubricating dispersant EBS into an internal mixer according to the mass portion ratio, wherein the roll gap of the internal mixer is 0.5mm, the internal mixing temperature is 145 ℃, and the time is 15 minutes to obtain a rubber material;

thirdly, mixing the obtained matte master batch with TPU with the hardness of 90A/95A according to the mass ratio of 1:10, and blowing a film to obtain the matte finished film.

Example 3

45% of TPU, 50% of mica powder, 2% of titanate coupling agent and 3% of lubricating dispersant EBS are selected.

The preparation method comprises the following steps:

The matte master batch provided by the invention is prepared by adding synthetic mica powder into TPU serving as a base material to prepare the matte master batch, and mixing the obtained matte master batch with TPU raw materials to blow a film to obtain the film, so that in the embodiment 1/2/3, the transmission flux transmittance Tt of the prepared film is higher than that of the existing matte film, the film is not whitish when stretched, and in the embodiment 3, the transmission flux transmittance Tt is good and the haze is best.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The matte master batch of the thermoplastic elastic polyurethane film is characterized in that the transparent stretched non-whitish TPU matte master batch comprises the following raw materials: TPU, mica powder, a titanate coupling agent and a lubricating dispersant, wherein the mass parts of the raw materials are as follows: 45-55% of TPU, 40-50% of mica powder, 1-2% of titanate coupling agent and 3-4% of lubricating dispersant EBS.

2. The matte master batch for the thermoplastic elastic polyurethane film according to claim 1, wherein the optimal mixture ratio of the raw materials is 50% of TPU, 45% of mica powder, 2% of titanate coupling agent and 3% of lubricating dispersant EBS.

3. The matte master batch for the thermoplastic elastic polyurethane film according to claim 1, wherein the TPU adopts a Huafeng 3385A-numbered TPU.

4. The matte master batch for the thermoplastic elastic polyurethane film according to claim 1, wherein the preparation method comprises the following steps:

and secondly, putting the rubber material into a double-screw injection molding machine for granulation to obtain master batches.

5. The matte master batch for the thermoplastic elastic polyurethane film according to claim 4, wherein the roll gap of the internal mixer is 0.5mm, the internal mixing temperature is 150 ℃, and the time is 15 minutes.