Manufacture method of PVC (Poly Vinyl Chloride) product

A product manufacturing and heat stabilizer technology, applied in the field of polyvinyl chloride (PVC) product manufacturing, can solve the problems of increasing the toxicity of PVC products, increasing the cost of PVC products, etc., and achieve the effect of benefiting the health and increasing the heat stabilization time

Inactive Publication Date: 2012-11-21
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Adding a large amount of heat stabilizers will increase the cost of PVC products on the one hand; on the other hand, heat stabilizers with certain toxicity such as lead salts and organic tin will increase the toxicity of PVC products

Method used

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  • Manufacture method of PVC (Poly Vinyl Chloride) product
  • Manufacture method of PVC (Poly Vinyl Chloride) product
  • Manufacture method of PVC (Poly Vinyl Chloride) product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Such as figure 1 As shown, the steps of adding a bridging agent to the heat stabilizer that needs to be added to the PVC pellets include:

[0046] Step 101, mixing heat stabilizer and bridging agent;

[0047] Which one of the heat stabilizer and bridging agent to use specifically can be determined according to actual needs.

[0048] Step 102, reacting the mixture of heat stabilizer and bridging agent at 40-60°C for 20-60 minutes;

[0049]React at 40-60°C for 20-60 minutes to fully combine the molecules of the thermal stabilizer and the bridging agent.

[0050] In step 103, the temperature of the reaction product of the mixture is lowered to below 40° C. and then added to the PVC pellets.

[0051] The temperature of the reaction product of the heat stabilizer and the bridging agent mixture is lowered to below 40° C., and added to the PVC pellets according to the existing method.

[0052] After that, processes such as molding of PVC products can be carried out to obta...

Embodiment 2

[0054] Such as figure 2 As shown, the steps of adding a bridging agent to the heat stabilizer that needs to be added to the PVC pellets include:

[0055] Step 201, mixing the lead salt or metal soap heat stabilizer with the bridging agent and stirring evenly;

[0056] By stirring, the heat stabilizer and the bridging agent can be mixed more fully, wherein the bridging agent can use sodium dodecylbenzenesulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, fatty alcohol polyoxyethylene ether ammonium sulfate, Any one of the five types of sodium lauryl sulfate and nonylphenol ethoxylates.

[0057] Wherein, the addition amount of bridging agent can be 2%~5% of heat stabilizer weight, is preferably 3%.

[0058] Step 202, allowing the mixture of thermal stabilizer and bridging agent to react at 45° C. for 40 minutes.

[0059] In step 203, the temperature of the reaction product of the mixture is lowered to below 40° C. and then added to the PVC pellets.

Embodiment 3

[0061] Add 1.1kg of sodium dodecylbenzenesulfonate (bridging agent) to 50kg of lead salt PVC heat stabilizer for pipes, and stir evenly; raise the temperature to 45°C, and control the temperature range between 43 and 47°C; Stir and react in this temperature range for 40 minutes; then cool down to below 40°C and discharge. The above reaction product is added into PVC pellets, stirred to obtain PVC products.

[0062] After being treated by the method of the present invention, the thermal stability time of PVC products can be increased by 10-30% under the same amount of heat stabilizer added. In the case of the same thermal stability time, the amount of thermal stabilizer added can be reduced by 10% to 30%.

[0063] For verifying effect of the present invention, carried out comparative experiment, wherein image 3 It is the de-HCl curve of the PVC pipe obtained by using the traditional heat stabilizer addition method. The heat stabilizer is a lead salt PVC heat stabilizer for ...

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Abstract

The invention discloses a manufacture method of a poly vinyl chloride PVC product. The method comprises the step of adding a bridge linking agent to a heat stabilizer required to be added to PVC particles, wherein the bridge linking agent is a substance containing a hydrophilic group and a lipophilic group in the molecular structure. The method is to fully mix the PVC molecule and the heat stabilizer under a bridging effect of the bridge linking agent, so as to achieve the purpose of fully performing the effect of the heat stabilizer and reducing the amount of the used heat stabilizer. The heat stabilizing time of the PVC product can be prolonged under the condition that the same quantity of heat stabilizer is added; and the quantity of added heat stabilizer can be correspondingly reduced with the same heat stabilizing time, therefore, the cost for manufacturing the PVC product can be reduced, and the toxicity of the PVC product also can be reduced; the benefit is brought to the health of a manufacturer and a user of the PVC product; and a more environment-friendly effect is achieved.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a method for manufacturing polyvinyl chloride (PVC for short). Background technique [0002] Polyvinyl chloride (PVC) is a general-purpose plastic, which is formed by free radical polymerization of vinyl chloride monomer. PVC products often have certain structural defects, such as some chain segments deviate from the ideal structure, forming allyl chloride and The tertiary chlorine structure makes the molecular structure of PVC plastics extremely unstable to heat. Even in the air, it begins to degrade slightly at 100°C, and its properties will change due to severe degradation at 150°C, releasing hydrogen chloride ( HCl) gas. If the production of HCl is not inhibited, HCl will self-catalyze the decomposition of the remaining PVC, making it further rapid until the macromolecules of PVC are cracked into various small molecules. The molding temperature of PVC needs to be higher t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K9/04
Inventor 马素德
Owner XIHUA UNIV
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