WO2017080062A1 - Low-temperature compounded foaming agent for pvc wallpaper and preparation method thereof - Google Patents

Abstract

Disclosed are a low-temperature compounded foaming agent for a PVC wallpaper and a preparation method thereof. The compounded foaming agent consists of the following components in parts by weight: 50-95 parts of azodicarbonamide; 1-30 parts of a foaming agent accelerator; 0.5-5 parts of a surface treating agent; and 3.5-15 parts of an anticaking agent. The preparation method comprises: placing the azodicarbonamide, the foaming agent accelerator, the surface treating agent, and the anticaking agent in a mixer; and performing a mixing operation at a speed of 50-500 r/min at a temperature of 30-70˚C for 5-50 min to obtain a compounded foaming agent. The compounded foaming agent of the invention has a decomposition temperature of 156-185˚C.

Description

Low-temperature compounding foaming agent for PVC wallpaper and preparation method thereof Technical field

The invention relates to a foaming agent, in particular to a low-temperature compounding foaming agent special for PVC wallpaper and a preparation method thereof.

Background technique

Azodicarbonamide is a yellow solid powder, which is a commonly used foaming agent in the production of PVC foamed wallpaper. Due to the high decomposition temperature of ordinary azodicarbonamide products (200-210 ° C), the existing foaming agent can not be quickly and thoroughly decomposed during the processing, and the residual foaming agent will cause yellowing of the product, affecting Product whiteness. Since the foaming agent is in the form of powder, it is easy to agglomerate during the storage process, and is not easily dispersed uniformly in the foaming formula, thereby causing the cell diameter of the PVC foamed wallpaper product to be uneven.

Summary of the invention

The purpose of the invention is to solve the defects of high decomposition temperature, incomplete decomposition and easy agglomeration of the common azodicarbonamide product, and provide a low-temperature compounding hair for PVC wallpaper with low decomposition temperature and good anti-caking property. Foaming agent. The wallpaper foamed product obtained by using the compounding foaming agent has uniform cell diameter and good whiteness. The invention also provides a preparation method of the compounding foaming agent.

In order to achieve the above object, the technical solution adopted by the present invention to solve the technical problem is as follows:

Low-temperature compounding foaming agent for PVC wallpaper, calculated by weight fraction, from azodicarbonamide content of 50-95 parts, foaming accelerator content of 1-30 parts, surface treatment agent content of 0.5-5 The anti-caking agent content is 3.5 to 15 parts.

Wherein, the foaming promoter is zinc benzenesulfonate, zinc p-toluenesulfonate, zinc oxide, urea fat, nitrate One or more of zinc acid, zinc acetate, and zinc octoate. The foaming accelerator enhances the primary decomposition reaction to inhibit the secondary decomposition reaction, making the decomposition faster and more thorough.

The surface treatment agent is one of white oil, stearic acid, calcium stearate, magnesium stearate, and zinc stearate.

The anti-caking agent is one of calcium carbonate, talc, and white carbon black. The synergistic effect of the surface treatment agent and the anti-caking agent enhances the anti-caking effect of the compounding foaming agent.

In order to achieve the above object, another technical solution adopted by the present invention to solve the technical problem is as follows:

The invention discloses a preparation method of a low-temperature compounding foaming agent for PVC wallpaper, which comprises azodicarbonamide, a foaming accelerator, a surface treatment agent and an anti-caking agent according to 50 to 95:1 to 30:0.5 to 5:3.5 to 15 The weight ratios are weighed separately, and then added to the mixer at 50-500 r/min, the mixing temperature is 30-70 ° C, and the mixture is stirred for 5 to 50 minutes to obtain a uniformly mixed foaming agent product.

Compared with the prior art, the low temperature compounding foaming agent for PVC wallpaper of the invention and the preparation method thereof have the following advantages:

1. The decomposition temperature of the common azodicarbonamide product is about 204 ° C. The decomposition temperature of the low-temperature compounding foaming agent for PVC wallpaper provided by the invention is 156-185 ° C, and the decomposition temperature of the compounding foaming agent is obviously lower than that. The decomposition temperature of the common azodicarbonamide product; under the same foaming process conditions, the compounding foaming agent is more completely decomposed than the ordinary azodicarbonamide product, and the whiteness of the wallpaper product is better.

2. After three months of storage of ordinary azodicarbonamide products, large agglomeration will occur, which will affect the use. The low temperature compounding foaming agent for PVC wallpaper provided by the invention has no obvious agglomeration after being stored for three months, indicating that the anti-caking property of the compounding foaming agent is obviously better than that of ordinary azodicarbonamide. It is easier to get even and fine cells.

3, under the same processing temperature conditions, get the same rate of foam wallpaper products, using PVC Compared with ordinary azodicarbonamide, the low-temperature compounding foaming agent for wallpaper has a significantly shorter foaming time of 5 to 20 seconds, and the shortening of the foaming time increases the production efficiency and reduces the production cost.

4. The preparation method of the low-temperature compounding foaming agent for PVC wallpaper provided by the invention is simple and the operation cost is low.

DRAWINGS

Figure 1 is a photo of a low temperature compounding foaming agent product for PVC wallpaper.

Figure 2 is a photo of a common azodicarbonamide product,

Figure 3 is a photograph of a comparison of a low temperature compounding foaming agent product for PVC wallpaper and a common azodicarbonamide product.

detailed description

The present invention will be further described in detail below with reference to the embodiments.

Example 1

The utility model relates to a low temperature compounding foaming agent for PVC wallpaper, which is composed of 95 parts of azodicarbonamide, 1 part of foaming accelerator, 0.5 part of surface treating agent and 3.5 parts of anti-caking agent. The foaming accelerator is zinc oxide, the surface treatment agent is white oil, and the anti-caking agent is white carbon black.

The preparation method comprises the following steps: adding azodicarbonamide, zinc oxide, white oil and white carbon black in a ratio to a mixer, mixing at 500 r/min for 5 minutes, and mixing at a temperature of 60 ° C to prepare a compounding foaming agent. product.

Example 2

The utility model relates to a low-temperature compounding foaming agent for PVC wallpaper, which is composed of 90 parts of azodicarbonamide, 3 parts of foaming accelerator, 2 parts of surface treatment agent and 5 parts of anti-caking agent. The foaming accelerator is zinc oxide and urea fat (the ratio is 1:1), the surface treatment agent is stearic acid, and the anti-caking agent is calcium carbonate.

The preparation method comprises the following steps: mixing azodicarbonamide, zinc oxide, urea fat, stearic acid and carbonic acid in the ratio Calcium was added to the mixer, mixed at 100 r/min for 20 minutes, and the mixing temperature was 36 ° C to prepare a compounded foaming agent product.

Example 3

The utility model relates to a low temperature compounding foaming agent for PVC wallpaper, which is composed of 60 parts of azodicarbonamide, 20 parts of foaming accelerator, 5 parts of surface treatment agent and 15 parts of anti-caking agent. The foaming accelerator is a combination of zinc benzenesulfonate and urea fat (ratio 1:1), a surface treatment agent is calcium stearate, and an anti-caking agent is talc.

The preparation method comprises the following steps: adding azodicarbonamide, zinc benzenesulfonate, urea lipid, calcium stearate and talc in the mixture into a mixer, mixing at 150 r/min for 50 minutes, and mixing at a temperature of 70 ° C. Compounded foaming agent products.

Example 4

The utility model relates to a low temperature compounding foaming agent for PVC wallpaper, which is composed of 50 parts of azodicarbonamide, 30 parts of foaming accelerator, 5 parts of surface treatment agent and 15 parts of anti-caking agent. The foaming accelerator is a combination of zinc p-toluenesulfonate and urea fat (ratio 1:1), a surface treatment agent is zinc stearate, and an anti-caking agent is talc.

The preparation method comprises the following steps: adding azodicarbonamide, zinc p-toluenesulfonate, urea fat, zinc stearate and talc in the mixture to a mixer, mixing at 50 r/min for 30 minutes, and mixing temperature at 30 ° C. A foaming agent product is compounded.

Example 5

The utility model relates to a low temperature compounding foaming agent for PVC wallpaper, which is composed of 50 parts of azodicarbonamide, 30 parts of foaming accelerator, 5 parts of surface treatment agent and 15 parts of anti-caking agent. The foaming accelerator is used in combination of zinc p-toluenesulfonate, urea fat and zinc acetate (ratio 1:1:1), and the surface treatment agent is stearin. Calcium acid and anti-caking agent are talc powder.

The preparation method comprises the following steps: adding azodicarbonamide, zinc p-toluenesulfonate, urea lipid, zinc acetate, calcium stearate and talc in the mixture into a mixer, mixing at 100 r/min for 5 minutes, mixing temperature 55 °C, a compound foaming agent product is prepared.

Comparative example 1

100 g of ordinary azodicarbonamide product was weighed.

100 grams of the compounded foaming agent products prepared in Examples 1 to 5 were weighed separately, and the low-temperature compounding foaming agent products and the pair of PVC wallpapers prepared by the respective examples were respectively tested according to the HG/T2097-2008 ADC industry standard. Proportion 1 decomposition temperature of ordinary azodicarbonamide product, the test results are shown in Table 1.

Table 1 corresponding decomposition temperature of the compounded foaming agent product obtained in each example

	Example 1	Example 2	Example 3	Example 4	Example 5	Comparative example 1
Decomposition temperature (°C)	185	180	176	172	156	204

It can be seen from Table 1 that the decomposition temperature of the low-temperature compounding foaming agent for PVC wallpaper prepared in Examples 1 to 5 is between 156 and 185 ° C, which are significantly lower than the decomposition of the common azodicarbonamide product. Temperature 204 ° C.

100 grams of the compounded foaming agent product obtained in Example 2 was weighed, and the PVC wallpaper special low temperature compounding foaming agent product obtained in Example 2 and the comparative example 1 common azodicarbonamide product were subjected to PVC blade coating. Bubble test. The test raw material (ie foaming formula) was: 100 parts of PVC (P-450 type), 100 parts of calcium powder, 70 parts of dioctyl phthalate, 2 parts of bismuth-zinc stabilizer, and 4 parts of foaming agent. The test temperature was set to 2 stages, the first stage plasticizing zone was 170 ° C, and the second stage foaming zone temperature was set to 190 ° C. The test results are shown in Table 2.

Table 2 Comparison results of the PVC blade coating foaming test of Example 2 and Comparative Example 1

It can be seen from Table 2 that the expansion ratio of Example 2 is 1.55 times in 90 seconds, and the comparison time is 1.56 times in the range of 1 to 95 seconds, and the foaming time is shortened by about 5 seconds, and the processing time required to reach the same magnification is obtained. Shorten, the production efficiency is significantly improved.

Comparative example 2

Weigh 1kg of common azodicarbonamide product and the low-temperature compounding foaming agent for PVC wallpaper prepared in Example 2 of the present invention, put it into PE bag, vent the mouth, and place the flat code under the flat plate. Pressing 25kg on the weight, after three months of code comparison, the photo is as shown in Figure 1 for the low-temperature compounding foaming agent for PVC wallpaper. Figure 2 is the common azodicarbonamide.

It can be seen from the picture that ordinary azodicarbonamide began to appear obviously large agglomerates after being pressurized for 25 months, and the low-temperature compounding foaming agent for PVC wallpaper was basically free of agglomeration. The agglomerated azodicarbonamide product needs to be crushed during use, otherwise the bulk azodicarbonamide cannot be sufficiently dispersed to form large pinholes in the product, which affects product quality.

The PVC wallpaper-specific low-temperature compounding foaming agent product obtained in Example 2 and the comparative example 1 ordinary azodicarbonamide product were respectively subjected to the above-mentioned method for press-forwarding for three months, and then the PVC blade coating foaming test was again performed. The test raw material (ie foaming formula) was: 100 parts of PVC (P-450 type), 100 parts of calcium powder, 70 parts of dioctyl phthalate, 2 parts of bismuth-zinc stabilizer, and 4 parts of foaming agent. The test temperature was set to 2 stages, the first stage plasticizing zone was 170 ° C, and the second stage foaming zone temperature was set to 190 ° C. The foamed sample was as shown in FIG.

As can be seen from the picture, the foamed sample made in Example 2 (left side) is obviously whiter than ordinary azodicarbonamide. Made of swatches (right side). At the same time, due to the difficulty in dispersing a part of the common azodicarbonamide, some large pore defects appeared in the sample.

Claims (5)

1. Low-temperature compounding foaming agent for PVC wallpaper, characterized in that the content of azodicarbonamide is 50-95 parts, the content of foaming accelerator is 1-30 parts, and the content of surface treatment agent is calculated by weight fraction It is 0.5 to 5 parts, and the anti-caking agent content is 3.5 to 15 parts.
2. The low-temperature compounding foaming agent for PVC wallpaper according to claim 1, wherein the foaming promoter is zinc benzenesulfonate, zinc p-toluenesulfonate, zinc oxide, urea fat, zinc nitrate, zinc acetate One or more of zinc octoate.
3. The low-temperature compounding foaming agent for PVC wallpaper according to claim 1, wherein the surface treatment agent is white oil, stearic acid, calcium stearate, magnesium stearate, and zinc stearate. One.
4. The low temperature compounding foaming agent for PVC wallpaper according to claim 1, wherein the anti-caking agent is one of calcium carbonate, talc powder and white carbon black.
5. The invention relates to a method for preparing a low-temperature compounding foaming agent for PVC wallpaper according to claim 1, which is characterized in that: azodicarbonamide, a foaming accelerator, a surface treatment agent and an anti-caking agent are respectively respectively according to a ratio It is added to a blender at 50-500 r/min, the mixing temperature is 30-70 ° C, and the mixture is stirred and mixed for 5 to 50 minutes to obtain a uniformly mixed foaming agent product.

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